Matrix Multiplication

Basically I have a problem with multiplying my matrices and have No idea howto solve it 1st. Matrix x(t) = sin( 2*pi*t/3) for t = -20:0.01:20 2nd. Matrix N=4000 w=hamming(N)

How do I multiply these two togehter (element by element didnt work when I transposed X and then .*'d it with w)

Answer 1

[Fangjun Jiang]

use size() function to get the size of your matrix. You'll find out the size of your two matrices are slightly different.

Answer 2

[Eric]

Thankyou for the quick reply, but the problem is still the same. I found out that x = 4001 1, and w was 1 4000, so I changed N to 4001. Now x: 4001 1, and w = 4001 1. However it still gives me an error with the dimensions

[Fangjun Jiang]

You need to understand the difference between matrix multiplication and element multiplication. A=rand(3,1);B=rand(3,1);C=A.*B;D=A*B';

[Fangjun Jiang]

In your code, x should be 1 by 4000.