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Asked by God'sSon
on 16 May 2011

hello,

i am trying to import (x) which is an audio signal and then concatenate with some zeros but get the following error message. can anyone please help.

cheers,

x = uiimport('test_signal.mat')

input_signal=x; B = zeros([1,8]); total_input_signal= [B input_signal];

??? Error using ==> horzcat The following error occurred converting from double to struct: Error using ==> struct Conversion to struct from double is not possible.

Error in ==> output at 10 total_input_signal= [B input_signal];

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Answer by Andrei Bobrov
on 16 May 2011

Accepted answer

if the mat - file contains one variable

x = uiimport('test_signal.mat'); names =fieldnames(x); xx = x.(names{:}); total_input_signal = [zeros(1,size(xx,2));xx];

Answer by Ivan van der Kroon
on 16 May 2011

if it is a real sound file like

x=load('handel')

x =

y: [73113x1 double] Fs: 8192

you will have a structure as well. For any set of variables you save and load again, the variables will be behind a structure. To perform array/matrix operations on the sound data in this case, you can think of

total_input_signal=[B ; x.y];

If it is still not clear to you, can you specify what variables youre file test_signal.mat is made up by?

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