Matrix Multiplication

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Eric
Eric 2011-9-16
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)

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回答（2 个）

Fangjun Jiang
Fangjun Jiang 2011-9-16
use size() function to get the size of your matrix. You'll find out the size of your two matrices are slightly different.
Eric
Eric 2011-9-16
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
  2 个评论
Fangjun Jiang
Fangjun Jiang 2011-9-16
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
Fangjun Jiang 2011-9-16
In your code, x should be 1 by 4000.

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