Subfunction equations applied to a main function matrix

So I've made a 5x1 vector in my main function. Let's call this vector V and let's just say the numbers in the vector are 2, 3, 4, 5, and 6. Now in my sub-function I have two equations, one for X and one for Y. Let's say

X = 2.*T.*V
Y = 0.5.*T.^2

I also have a T column vector that is let's say 10x1. So now I have to create two new matrix that have the same amount of rows as the T vector along with 5 columns that associate with the 5 numbers in vector V. Basically, new matrix X_MATRIX that pertains to equation X should have a 10x5 matrix where each value in vector V is applied to the equation. So if the second row of vector T is 5 and we use the first number in vector V, which is 2, the second row and first column value of X_MATRIX should be 2.*5.*2 which is 20. How would I code that to work for every value so the whole X_MATRIX has correct values? I assume the same thing will be applied to Y_MATRIX that pertains to the equation Y, however since Y doesn't have V in it will it be the same?

Answer 1

[Subin Kuttappan Stellal Mary]

Hi Lavy,

Since T is 10x1 matrix and V is 5x1 matrix, the following line of code does now work :

X = 2.*T.*V

For the above code to work, T and V should be of same size.

I understand your use case as follows :

The output required is X_MATRIX and Y_MATRIX.

X_MATRIX is a 10x5 matrix, where each row contains the product of the row element from T and all the elements from V (i.e. 5 elements). Y_MATRIX is a 10x1 matrix.

Following lines of code will perform this :

X_MATRIX = 2*T*V'
Y_MATRIX = 0.5.*T.^2

Sample I've tried :

V = [2 3 4 5 6]';
T = (1:10)';
X_MATRIX = 2*T*V'
X_MATRIX =

     4     6     8    10    12
     8    12    16    20    24
    12    18    24    30    36
    16    24    32    40    48
    20    30    40    50    60
    24    36    48    60    72
    28    42    56    70    84
    32    48    64    80    96
    36    54    72    90   108
    40    60    80   100   120

Y_MATRIX = 0.5.*T.^2

Y_MATRIX =

    0.5000
    2.0000
    4.5000
    8.0000
   12.5000
   18.0000
   24.5000
   32.0000
   40.5000
   50.0000