why i'm getting this error?

Question

0 个投票

why i'm getting this error: Error using * Inner matrix dimensions must agree.

thanks

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David Fletcher 2018-3-25

编辑：David Fletcher 2018-3-25

Sounds like you're trying to do inner matrix multiplication rather than element by element multiplication

possibly here: (a line number where the error occurred might be handy)

*an*cos*(2*pi*f0*n.'*t) + *bn*sin*(2*pi*f0*n.'*t

instead of

an.*cos(2*pi*f0*n.'*t) + bn.*sin(2*pi*f0*n.'*t

ocsse 2018-3-25

still getting an error

Answer 1

Star Strider 2018-3-25

0 个投票

Your ‘an’ and ‘bn’ are (1x4) vectors, and ‘t’ is (1x500).

One way to avoid it is to transpose ‘an’ and ‘bn’ to column vectors:

s = s + a0 + an'*cos(2*pi*f0*n.'*t) + bn'*sin(2*pi*f0*n.'*t);

I do not know what you want for a final result. If you want a single row vector for each ‘n’, sum them:

s = s + a0 + sum(an'*cos(2*pi*f0*n.'*t) + bn'*sin(2*pi*f0*n.'*t));