Size matrix matlab

Answer (1 of 7): Size returns you with the [row, column ] of the defined matrix whereas length returns you with only row or column ( which one is bigger) consider a ... brezzars xvideos return errors, because the matrix dimensions do not agree. To calculate operations like above you have to adjust the bigger array size to fit the smaller one.Empty matrix, scalar, or vector function in loop. Greetings all, I need to write a function called CLF whose input argument is x, that input argument must not have more than two …For example, if A is a 3-by-4 matrix, then size(A) returns the vector [3 4]. ... Thread-Based Environment Run code in the background using MATLAB® backgroundPool or accelerate … wunderground miami matlab中fopen函数在指定文件打开的实例如下: *1)“fopen”打开文件,赋予文件代号。 语法1:FID= FOPEN(filename,permission) 用指定的方式打开文件 FID=+N (N是正整数):表示文件打开成功,文件代号是N. FID=-1 : 表示文件打开不成功。 FID在此次文件关闭前总是有效的。 如以读方式打开,matlab首先搜索工作目录,其次搜索matlab的其他目录,“permission”是打开方式参数。 打开方式参数由以下字符串确定: r 读出 w 写入(文件若不存在,自动创建) a 后续写入(文件若不存在,自动创建) r+ 读出和写入(文件应已存在) w+ 重新刷新写入,(文件若不存在,自动创建) a+ 后续写入(文件若不存在,自动创建))Find doesn't seem to work with Matrix larger... Learn more about find MATLAB [i,j]=find(A); A is matrix of size n where n varies in size from 100 to 2000 (each time calculation is completed it's incremented by 50). For n = 100 all is fine, but once I reach 150 i and j only... ups drop off nesr me Data is inferred as a variable size matrix,... Learn more about variable size, error, simulink, output Simulink MATLAB provides many ways to store numbers and variables. All the numbers are equivalent to actual numerical real numbers. There is an upper limit to the largest number and a lower limit on the absolute value of the non-zero number. This is due to the finite memory of the processing devices compared to the real number, which can be infinite.Y=cell(object): This syntax converts any Java array, String or Object array, .Net system into a Matlab cell array. The input arguments like size must be an integer value. If the size is given as 0, then it results in an empty cell array and if the size is given as any negative value then it is considered as 0. why is the crime rate so high in sarasota floridaIncorrect dimensions for matrix multiplication. Check that the number of columns in the first matrix matches the number of rows in the second matrix.Greetings all, I need to write a function called CLF whose input argument is x, that input argument must not have more than two dimensions.If x is an empty array, the function returns -1.If x is a scalar, the function returns 0.If x is a vector, the function returns 1 and if x is none of the above, the function returns 2, do not use isempty, isscalar, isvector, my code is as follows: thank you! craigslist akron canton boats if any (size (A) ~= size (B)) error ('Wrong matrix size!'); end C = zeros ( size (A) ); for x = 1 : size (A) (1) for y = 1 : size (A) (2) m = length (A {x,y}); n = length (B {x,y}); for k = 1 : m+n-1 Z {x,y} (k) = 0; for j = max (1,k+1-n): min (k,m) Z {x,y} (k) = Z {x,y} (k)+ A {x,y} (j) * B {x,y} (k+1-j); end end end end //ERROR: ???Learn more about matrix MATLAB I have a program in which I have need to find inverse of large size square matrix..e.g. [m n]=[800 800 ] It takes longer to solve the program. I want to more effective and time saving way to ...Answer: In MATLAB, an array is a multi-dimensional, homogeneous data structure that is used to store and manipulate a collection of elements. The shape of an array refers to the number of rows and columns it has, and the size refers to the total number of elements in the array. The shape of an a...Axes size can vary roughly 2 pixels less to 5 pixels more. So sometimes the solution is to record the contour in an array instead of an axes (a bit of a nuisance but possible), or if one must use getframe then imresize()Select a Web Site. Choose a web site to get translated content where available and see local events and offers. Based on your location, we recommend that you select: . time converter japan to us To create a cell array of a specified size, use the cell function described below. You can use cell to preallocate a cell array and assign data to it later. cell can also convert certain types of Java®, .NET, and Python® data structures into cell arrays of equivalent MATLAB® objects. grammar C = cell (n) C = cell (sz1,...,szN) C = cell (sz)Description of Size Function in MATLAB A = size (Y), this function will return the size of each dimension of the array passed as input. [a, b] = size (Y), this function will return the size of input matrix in 2 separate variables 'a' and 'b' A = size (Y,dim), this function will return the size of Y's dimension, specified by the input scalar dim. what does walmart pay per hour How to write this thetta fuction in Matlab? Someone wrote it in Python like this: Theme Copy def thetta (r): thettar = np.zeros (r.size) h = (r_2 - r_1) / N for i in range (r.size): for j in range (i): thettar [i] += h * 0.5 * (1 / (r [j] * math.tan (betta (r [j]))) + 1 / (r [j+1] * math.tan (betta (r [j+1])))) return thettar 0 Comments Select a Web Site. Choose a web site to get translated content where available and see local events and offers. Based on your location, we recommend that you select: .In MATLAB, a string is a character array. In MATLAB, length() gives the length of an array, and size() gives the size of a matrix. My Personal Notes arrow_drop_up makers mark commercial song Apr 4, 2022 · 1 Link Use this for checking the size Theme Copy if ~isequal (size (M1), [18 4]) For example Theme Copy M1 = rand (18, 4); M2 = rand (18, 3); if ~isequal (size (M1), [18 4]) fprintf ("Matrix M1 must be an 18x4 matrix. "); end if ~isequal (size (M2), [18 4]) fprintf ("Matrix M2 must be an 18x4 matrix. "); end Result Theme Copy Inner matrix dimensions must agree? this is my first matlab script, so this question may seem basic and blindingly obvious, but I am a little stuck at the moment. I have a matlab script of two lines: I’m going off the Create 2-D Line Graph tutorial on Mathworks. I want to plot f(x) = […]Inner matrix dimensions must agree? this is my first matlab script, so this question may seem basic and blindingly obvious, but I am a little stuck at the moment. I have a matlab script of two … ipad stylus walmart Learn more about matrix MATLAB I have a program in which I have need to find inverse of large size square matrix..e.g. [m n]=[800 800 ] It takes longer to solve the program. I want to more effective and time saving way to ...Actually, MATLAB has a wide help library that also contains good examples to illustrate difference between length and size functions. “size” gives length of all matrix dimension, whereas “length” gives your Length of largest array dimension. Such as; A = [0 0 0 0; 0 0 0 0; 0 0 0 0]; size (A) ans= 3 4 (because of four columns and three rows) csl plasma donation center near me As long as the number of elements in each shape are the same, you can reshape them into an array with any number of dimensions. Using the elements from A , create a 2-by-2-by-3 multidimensional array. How do you rescale a matrix in Matlab? B = rescale( A ) scales the entries of an array to the interval [0,1]. The output array B is the same size ...Axes size can vary roughly 2 pixels less to 5 pixels more. So sometimes the solution is to record the contour in an array instead of an axes (a bit of a nuisance but possible), or if one must use getframe then imresize()Find the size of the table. Although the BloodPressure variable contains two columns, size only counts the number of variables. sz = size (A) sz = 1×2 5 4 Dimension Lengths as Separate Arguments Create a random matrix and return the number of rows and columns separately. A = rand (4,3); [numRows,numCols] = size (A) numRows = 4 numCols = 3 Data is inferred as a variable size matrix,... Learn more about variable size, error, simulink, output Simulink I am having two matrix of size 7*7 and 7*1. Now, i need to compare these two matrix and alter entries in one matrix based on second matrix. Also, during computation, i need to consider first column of matrix A as last column and last row of matrix B as first row. ... Find the treasures in MATLAB Central and discover how the community can help ... state champs wiki For example, if A is a 3-by-4 matrix, then size(A) returns the vector [3 4]. If A is a table or timetable, then size(A) returns a two-element row vector consisting of the number of rows and the number of table variables. How to write this thetta fuction in Matlab? Someone wrote it in Python like this: Theme Copy def thetta (r): thettar = np.zeros (r.size) h = (r_2 - r_1) / N for i in range (r.size): for j in range (i): thettar [i] += h * 0.5 * (1 / (r [j] * math.tan (betta (r [j]))) + 1 / (r [j+1] * math.tan (betta (r [j+1])))) return thettar 0 Comments dim sum nearby May 11, 2013 · merging cell arrays into an index array. Learn more about indexing cell arrays, merge different size arrays The size of the resulting matrix is 1-by-4 because it has one row and four columns. A matrix of this shape is often referred to as a row vector. A = [12 62 93 -8] A = 1×4 12 62 93 -8 sz = size (A) sz = 1×2 1 4 Now create a matrix with the same numbers, but arrange them in two rows. This matrix has two rows and two columns. A = [12 62; 93 -8]Code % convert finite values to indices between 1 and map length n = size(map, 1); inds = (img(valid)-bounds(1)... Saltar al contenido Cambiar a Navegación Principal 5th gen rams Empty matrix, scalar, or vector function in loop. Greetings all, I need to write a function called CLF whose input argument is x, that input argument must not have more than two dimensions. If x is an empty array, the function returns -1. If x is a scalar, the function returns 0. If x is a vector, the function returns 1 and if x is none of the ...Executing the size command returns an integer list with n elements for an n-dimensional object. For example, a three-by-four matrix is two-dimensional, ... a10 aux cord Matlab code for finding size of matrices Mathematics 726 Getting information about a matrix. Here is how to get information about the dimensions of a vector or matrix. In the following A is an m x n matrix, x is a 1 x n row vector and y is a m x 1 column vector.% Step 1: Prepare the data % Load the x and y coordinates of your shapes load ('shapes.mat'); % Concatenate the x and y coordinates of each shape data = []; for i = 1:numel (shapes) data = [data; shapes {i}]; end % Step 2: Define the CNN architecture layers = [ sequenceInputLayer ( [size (data, 1) 2]) lstmLayer (64,'OutputMode','sequence')I want to reduce the size of a matrix (M,N) by a fourth by averaging the values of neighboring cells. So for instance the cells (1,1), (1,2), (2,1) and (2,2) in the old matrix will now be represented by their average which will be stored in (1,1) of the new matrix. japanese porn ster May 11, 2013 · my rownames is a vector that is longer than my raw data, all {x,y,z} mygoal would have the dim of length (rownames) and (size (all,2).*size (all,3)) What would be a good way to do this? I want to make something that I can update with new excel data and rownames as get new data. on 12 May 2013 Edited: Cedric Wannaz on 12 May 2013 Matlab code for finding size of matrices Mathematics 726 Getting information about a matrix. Here is how to get information about the dimensions of a vector or matrix. In the following A is an m x n matrix, x is a 1 x n row vector and y is a m x 1 column vector. jersey mike reviews I am having two matrix of size 7*7 and 7*1. Now, i need to compare these two matrix and alter entries in one matrix based on second matrix. Also, during computation, i need to consider first column of matrix A as last column but computation order of matrix B does not change.Learn more about matlab, python, def, function, for, array, help MATLAB, MATLAB Coder How to write this thetta fuction in Matlab? Someone wrote it in Python like this: def thetta(r): thettar = np.zeros(r.size) h = (r_2 - r_1) / N for i in range(r.size): f... xxx mom hd Data is inferred as a variable size matrix,... Learn more about variable size, error, simulink, output SimulinkDec 19, 2013 · if any (size (A) ~= size (B)) error ('Wrong matrix size!'); end C = zeros ( size (A) ); for x = 1 : size (A) (1) for y = 1 : size (A) (2) m = length (A {x,y}); n = length (B {x,y}); for k = 1 : m+n-1 Z {x,y} (k) = 0; for j = max (1,k+1-n): min (k,m) Z {x,y} (k) = Z {x,y} (k)+ A {x,y} (j) * B {x,y} (k+1-j); end end end end //ERROR: ??? Creating Matrices. MATLAB has many functions that create different kinds of matrices. For example, you can create a symmetric matrix with entries based on Pascal's triangle: A = …I have a 3D Matrix (Wc), (14, 121, 39), so the matrix is 14 rows, 121 columns, and there are 39 of these matrices. I want to plot the 1st row of all 39 matrices on one graph, and the second row...Jun 21, 2013 · rows = @ (x) size (x,1); cols = @ (x) size (x,2); and then use, for example, like this: for y = 1:rows (myMatrix) for x = 1:cols (myMatrix) do_whatever (myMatrix (y,x)) end end It might appear as a small saving, but size (.., 1) must be one of the most commonly used functions. white acrylic nails short In this article, we will see the swapping of elements into a matrix in MATLAB. Different methods are illustrated below: Method 1: By changing elements of rows and columns In this method, we are simply changing the elements of particular rows and columns in the specified rows and columns respectively. Example 1: Matlab Output:Jan 23, 2023 · It is my understanding that you are facing an issue with the 'Variable Size' in the Simulink model. I recommend you perform the following changes in the Simulink model: 1. Enable the 'Variable size' checkbox for the output variable in the property inspector. 2. Change the sample time for the scope to discrete to support the variable size signal. Find the size of the table. Although the BloodPressure variable contains two columns, size only counts the number of variables. sz = size (A) sz = 1×2 5 4 Dimension Lengths as Separate Arguments Create a random matrix and return the number of rows and columns separately. A = rand (4,3); [numRows,numCols] = size (A) numRows = 4 numCols = 3 pornhub dasi Most recent answer. 14th May, 2015. Ning Chuang. UNSW Sydney. Just use Matlab help to find anything you want to know. Yes, just typing the command: size (the name of the matrix). Then Matlab will ...How do I resize a matrix in MATLAB? Ask Question Asked 13 years, 9 months ago Modified 7 years ago Viewed 43k times 8 Suppose I had a 1-by-12 matrix and I wanted to resize it to a 4-by-3 matrix. How could I do this? My current solution is kind of ugly: for n = 1: (length (mat)/3) out (n,1:3) = mat ( ( (n-1)*3 + 1): ( (n-1)*3 + 3) ); end super bowl 2020 playoff bracket Apr 19, 2016 · I have a 3D Matrix (Wc), (14, 121, 39), so the matrix is 14 rows, 121 columns, and there are 39 of these matrices. I want to plot the 1st row of all 39 matrices on one graph, and the second row of all the matrices on its own graph...etc for all 39 matrices. I used a for loop to create the matrices, not sure if this will effect how to do this. Select a Web Site. Choose a web site to get translated content where available and see local events and offers. Based on your location, we recommend that you select: .The size of the resulting matrix is 1-by-4 because it has one row and four columns. A matrix of this shape is often referred to as a row vector. A = [12 62 93 -8] A = 1×4 12 62 93 -8 sz = size (A) sz = 1×2 1 4 Now create a matrix with the same numbers, but arrange them in two rows. This matrix has two rows and two columns. A = [12 62; 93 -8] t mobile new tower locations in order to figure out whether something has at least 3 significant figures, you need to load the xlsx file as if all of the entries are text, and then you have to examine strings and count positions after the decimal place.Here is how to get information about the dimensions of a vector or matrix. In the following A is an m x n matrix, x is a 1 x n row vector and y is a m x 1 column vector. size (A,1) % Number of rows of A = m size (A,2) % Number of columns of A = n size (A) % m n where A is m x n lenght (A) % max (m,n) length (x) % m length (y) % n.Data is inferred as a variable size matrix, while its properties in the Model Explorer specify its size as inherited or fixed. Please check the 'Variable Size' check. Follow 13 views (last 30 days) ... Find the treasures in MATLAB Central …Learn more about find MATLAB [i,j]=find(A); A is matrix of size n where n varies in size from 100 to 2000 (each time calculation is completed it's incremented by 50). For n = 100 all is fine, but once I reach 150 i and j only... www.paypal.com loginFor those looking to find the size of an image in matlab, don't use: [height, width] = size (image); This is because imread stores the RGB values separately (for colour images), resulting in a three dimensional matrix. For example, if you loaded a 500p high, 200p wide colour image, this would result in a 500x200x3 matrix.In Matlab, a matrix is a type of variable that is mostly used for mathematical calculation. This allows you to deal with matrix calculations effectively and quickly. As stated in the introduction, a matrix is a two-dimensional array in linear algebra that is related to analytics.Its time complexity is constant and independent of matrix size; Does not use any MATLAB functions; Is easy to adapt to higher dimensions; Share. Improve this answer. Follow answered Oct 9, 2013 at 22:59. Mohsen Nosratinia Mohsen Nosratinia. 9,814 1 1 gold badge 26 26 silver badges 52 52 bronze badges. 0. lowe's starting pay Write a MATLAB function that takes a matrix as an input and returns a vector that contains the number of rows and columns in the matrix. Additionally, the function should print these values (number of rows, number of columns) to the screen. You may not use the function size(). Add comments to each line explaining what the code does. Write a second MATLAB function that performs the same task as ...A two-dimensional array; that is, an array of rows and columns. (2) The background area of color display. Webopedia is an online information technology and computer science resource for IT professionals, students, and educators. Webopedia f... how much does a ram 1500 cost 2020/09/10 ... In this tutorial you will learnhow to find the size of a matrix in matlab,size of matrix in matlab,how to get the number of rows in matrix ...Learn more about matlab, python, def, function, for, array, help MATLAB, MATLAB Coder How to write this thetta fuction in Matlab? Someone wrote it in Python like this: def thetta(r): thettar = np.zeros(r.size) h = (r_2 - r_1) / N for i in range(r.size): f... tyrone unblocked games The Linear Algebra operations in Matlab/octave by default follow Row-Column order (ie they are row major by default); so if A is a matrix of size 3x2 (3 rows and 2 columns), we can use size to determine the order of matrix/vector size(A) will return 3 2 (the first entry representing no.of rows & the second one is no.of columns).Answer (1 of 7): Size returns you with the [row, column ] of the defined matrix whereas length returns you with only row or column ( which one is bigger) consider a ...sz = size( A ) returns a row vector whose elements are the lengths of the corresponding dimensions of A . For example, if A is a 3-by-4 matrix, then size(A) ...How do you find the dimensions of a matrix in MATLAB? sz = size( A ) returns a row vector whose elements are the lengths of the corresponding dimensions of A . For … night of the living dead wikipedia Toggle Main Navigation. Sign In to Your MathWorks Account; My Account; My Community Profile; Link License; Sign Out; Products; SolutionsMost recent answer. 14th May, 2015. Ning Chuang. UNSW Sydney. Just use Matlab help to find anything you want to know. Yes, just typing the command: size (the name …I am having two matrix of size 7*7 and 7*1. Now, i need to compare these two matrix and alter entries in one matrix based on second matrix. Also, during computation, i need to consider first column of matrix A as last column but computation order of matrix B does not change.I am having two matrix of size 7*7 and 7*1. Now, i need to compare these two matrix and alter entries in one matrix based on second matrix. Also, during computation, i need to consider first column of matrix A as last column and last row of matrix B as first row. hot sex tube.com The "gcf" function returns the handle to the current figure window, and the "get" function retrieves the current position of the figure window. The new position is then calculated by adding [0 0 30 30] to the current position, which increases the size of the window by 30 pixels on all sides. Finally, the "set' function is used to set the new ...You can't add or subtract vectors or matrices of different sizes because MATLAB will display an error message. Use the following steps to see how to perform this task: Type a= [1,2;3,4] and press Enter. You see a = 1 2 3 4 Type b= [5,6;7,8] and press Enter. You see b = 5 6 7 8 Type c = a + b and press Enter. This step adds matrix a to matrix b.Learn more about matlab, python, def, function, for, array, help MATLAB, MATLAB Coder. How to write this thetta fuction in Matlab? Someone wrote it in Python like this: def thetta(r): thettar = np.zeros(r.size) h = (r_2 - r_1) / N for i in range(r.size): f... Vai al contenuto. Navigazione principale in modalità Toggle. Accedere al ... facebook marketplace spokane wa See full list on mathworks.com Write a MATLAB function that takes a matrix as an input and returns a vector that contains the number of rows and columns in the matrix. Additionally, the function should print these values (number of rows, number of columns) to the screen. You may not use the function size(). Add comments to each line explaining what the code does. Write a second MATLAB function that performs the same task as ... star news wilmington obituaries As long as the number of elements in each shape are the same, you can reshape them into an array with any number of dimensions. Using the elements from A , create a 2-by-2-by-3 multidimensional array. How do you rescale a matrix in Matlab? B = rescale( A ) scales the entries of an array to the interval [0,1]. The output array B is the same size ...Data is inferred as a variable size matrix,... Learn more about variable size, error, simulink, output Simulink kobza auction time Incorrect dimensions for matrix multiplication. Check that the number of columns in the first matrix matches the number of rows in the second matrix. To operate on each element of the matrix individually, use TIMES (.*) for elementwise multiplication. Related documentation The problem persists even with matlab examples. Sign in to comment.Dec 19, 2013 · if any (size (A) ~= size (B)) error ('Wrong matrix size!'); end C = zeros ( size (A) ); for x = 1 : size (A) (1) for y = 1 : size (A) (2) m = length (A {x,y}); n = length (B {x,y}); for k = 1 : m+n-1 Z {x,y} (k) = 0; for j = max (1,k+1-n): min (k,m) Z {x,y} (k) = Z {x,y} (k)+ A {x,y} (j) * B {x,y} (k+1-j); end end end end //ERROR: ??? Find the size of the table. Although the BloodPressure variable contains two columns, size only counts the number of variables. sz = size (A) sz = 1×2 5 4 Dimension Lengths as Separate Arguments Create a random matrix and return the number of rows and columns separately. A = rand (4,3); [numRows,numCols] = size (A) numRows = 4 numCols = 3Hello, How can I generate a Matrix (size 4x4) with random different figures from 1 to 4 ? Figures must be different in the lines and the columns. in example: nfl tier list Data is inferred as a variable size matrix,... Learn more about variable size, error, simulink, output Simulink Toggle Main Navigation. Sign In to Your MathWorks Account; My Account; My Community Profile; Link License; Sign Out; Products; SolutionsThis command is used to find the size of the matrix. It gives the size in the form of rows and columns. (number of rows and number of columns). Let us consider example A = [ 5 6 8 2 ; 6 5 4 3 ; 8 7 2 2 ] Output for size (A) will be 3 4. Here 3 represents no of rows, and 4 represents no of columns. Screen 8: Size of MatrixI have $2$ matrices of different sizes: $8 \\times 3$ matrix $A$ and $2 \\times 3$ matrix $B$. I need to subtract from each row of $B$, a particular row of $A$ and ... naruto wikipedia You can start with a valid matrix: Theme Copy A = [1:4; 1:4, 1:4, 1:4]; Then perform only operations, which do not destroy the validity: Interchange rows and columns in pairs: Theme Copy for k = 1:1000 index = randperm (4, 2); % older Matlab versions accept 1 input only A (index (1), :) = A (index (2), :); index = randperm (4, 2);Inner matrix dimensions must agree? this is my first matlab script, so this question may seem basic and blindingly obvious, but I am a little stuck at the moment. I have a matlab script of two lines: I’m going off the Create 2-D Line Graph tutorial on Mathworks. I want to plot f(x) = […]Dimension lengths, returned as a nonnegative integer scalar when dim is a scalar and a row vector of nonnegative integer scalars when dim is a vector. If an element of the specified dimension argument is larger than ndims (A) , then size returns 1 in the corresponding element of szdim. Data Types: double. how to make your phone cute and aesthetic Find the size of the table. Although the BloodPressure variable contains two columns, size only counts the number of variables. sz = size (A) sz = 1×2 5 4 Dimension Lengths as Separate Arguments Create a random matrix and return the number of rows and columns separately. A = rand (4,3); [numRows,numCols] = size (A) numRows = 4 numCols = 3 small family nude MATLAB/Octave Python Description; doc help -i % browse with Info: help() Browse help interactively: help help or doc doc: help: Help on using help: help plot: ... Matrix dimensions: size(a,2) or length(a) a.shape[1] or size(a, axis=1) Number of columns: length(a(:)) a.size or size(a[, axis=None]) Number of elements: ndims(a) a.ndim:Axes size can vary roughly 2 pixels less to 5 pixels more. So sometimes the solution is to record the contour in an array instead of an axes (a bit of a nuisance but possible), or if one must use getframe then imresize() watkins glen racing reference Descripción ejemplo L = length (X) devuelve la longitud de la dimensión más grande de un arreglo en X. En el caso de los vectores, la longitud es simplemente el número de elementos. En el caso de arreglos con más dimensiones, la longitud es max (size (X)). La longitud de un arreglo vacío es cero. Ejemplos contraer todo Número de elementos de vectorThe goal of MATLAB arrays is to have a type similar to mathematical vectors and matrices. As such, row and column arrays are not equivalent. Mono-dimensional arrays are actually a special case of multi-dimensional arrays, and …For example, if A is a 3-by-4 matrix, then size(A) returns the vector [3 4]. If A is a table or timetable, then size(A) returns a two-element row vector consisting of the number of rows and the number of table variables. sports teams quiz