Matrix dimensions must agree.

Hi,

I am very new to the Matlab. I made one function which gives me an array of sinusoids. In arguments, I am providing an array of amplitude, frequency and phase. The other arguments are length and sampling frequency. When I call the function from command line I am getting error mentioned in the title. I have also tried with the .* method.

Can some one guide me the solve the problem?

Thanks.

Error:

Matrix dimensions must agree.

Error in generateSin (line 5)

function [z] = generateSin (a,f, ph,L, Fs)
T = 1/Fs;
tmax = L*T;
t = 0:T:tmax-T;
z = a.*sin (2*pi*t.*f + ph)
end
%command line function call sample : z = generateSin ([3,5,7], [5,10,15], [0,pi/2, pi/6], 1000, 300)

[Torsten]

t is a vector of length 1000, a, f and ph are vectors of length 3. What dimension do you expect z to have ?

Answer 1

[Andrei Bobrov]

function [z] = generateSin (a,f, ph,L, Fs)
    z = (a(:).*sin (2*pi*(0:L-1)/Fs).*f(:) + ph(:))';
end

[Ravikumar Mevada]

Hi,

Can you please explain, Why you have inserted ' at the end of the fourth line?

[Andrei Bobrov]

Hi Ravikumar!

First please read part of help from MATLAB Getting Started.

In our case " ' " - sign transpoze our array.