I am trying to access a method within the same file or shall i say the return value a function

I have a function called createleftwaveform and it returns a value which is stored in LeftWaveform

function LeftWaveform = createleftwaveform(obj, ~)
swept_chirp_up = 2*pi
LeftWaveform = swept_chirp_up;
end

There is another function called createleftsignal. I want it to do a fast fourier transform on the value gained in the above method so I tried typing obj.createleftwaveform. The line compiles but it fails on the Filtered_T stating that the Matrix dimensions must agree.

function LeftTxSignal = createleftsignal(obj, ~)
T = fft(obj.createleftwaveform());
Filtered_T = W.*T;
end


NOTE : I am just modularising my code so I am using OO - Matlab, this multiplication works there are no matrix dimension diagreements then. I just think that I am calling /accessing the value in a wrong way . I do not know how to fix it . PLEASE HELP!!!

Many thanks

This is really a Programming & Design question. It's only vaguely related to math in that you're using FFT's.