MATLAB: Error horzcat CAT arguments dimensions

error horzcat cat

does anyone understand why am i getting this error:

??? Error using ==> horzcat CAT arguments dimensions are not consistent. Error in ==> code at 60 peaksK = [distancesK(1), peakssK, distancesK(end)];

when using this code:

(distancesK = 582×1 double)

[peakssK, iPeakssK] = findpeaks(distancesK); 
   peaksK = [distancesK(1), peakssK, distancesK(end)];

i have already used this code million times but now it is giving me this error. can anyone help me please? thank you very much.

Best Answer

peaksK = [distancesK(1); peakssK(:); distancesK(end)];

peaksK = [distancesK(1), peakssK(:).', distancesK(end)];

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MATLAB: “Matrix dimensions must agree”

Because val1 is not preallocated in the code you've showned, it isn't obvious that is created by the loop.

val1 is shorter by 1 element than val because you explicitly construct it so. Your loop is

for loopindex 2 : numel(val)-1  %data as a name for a loop index is extremely misleading
   val1(loopindex) = ...  
end %last index is numel(val)-1. Hence val1 has length numel(val)-1

If you want val1 to be the same length as val then you can assign 0 to the last element, the same way 0 is automatically assigned to val1(0) at the first step of the loop when it does val(2) = .... So after the loop you could have:

val1(end + 1) = 0;

But the loop is completely unneeded and is a very slow way to construct val1 (particularly without the aforementioned preallocation). This would achieve the same, including creating val1 the correct length:

valdiff = diff(val);
val1 = [false, valdiff(1:end-1) > 0 & valdiff(2:end) < 0 & val(2:end-1) > 4, false];

With that fix your stem line will work.

No idea why you tried to use bsxfun or why you mentioned it. There is nowhere in your code where it could be used.

MATLAB: Processing wav data to extract

for k = 1 : numfiles
  thisdata = mydata{k};
  [peaks{k}, peaklocs{k}] = findpeaks(thisdata);
end

Best Answer

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MATLAB: “Matrix dimensions must agree”

MATLAB: Processing wav data to extract

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