How to store data into a matrix?

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I'm calculating Zerocross (ZCR) and Short term energy (STE) for a signals in a matrix. After I calculate these features I want to store results into one matrix F to contain both features STE and ZCR, like this :

 F=[STE1][ZCR1]
   [STE2][ZCR2]
   [STE3][ZCR3]...

B is 1x59 cell array which cells are matrixes B = {[240x1], [480x1],[960x1] ...} so each cell is another matrix.

So I want my output to be like this

 F = [240x1][ZCR1]
     [480x1][ZCR2]
     [960x1][ZCR3] ...
 % first column (e.g.[240x1]) is STE calculation of the first column in B, and second column is a calculation of the Zerocross also of the first column of the cell array B..and so on

How can I get that output? My code is next:

 for i=1:length(V)
    V=B{1,i}
    %zerocross
    zcd = dsp.ZeroCrossingDetector;
    numZeroCross = step(zcd,V)
    ZER{i}=numZeroCross %output for zerocross
    %short term energy
    winLen=length(V) 
    energyST = sum(V.^2,winLen) 
    EN{i}=energyST %output for STE
 end

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Jan 2017-3-13

在 MATLAB Online 中打开

 Matrix B is 1x59 cell array which looks like this
 B = {[240x1], [480x1],[960x1] ...} so each cell is a matrix.

This is not easy to understand. What is "B"? If B is a "matrix", it is not a "cell vector". What is the relation between "B" and the shown "F"? What exactly does "[240x1,ZCR1]" mean? What is "ZCR1"?

Lara Lirnow 2017-3-13

Hi, I edited my question. I hope I explained it a bit better. Thank you

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Answer 1

Guillaume 2017-3-13

在 MATLAB Online 中打开

0 个投票

I assume that

for i=1:length(V)

is meant to be

for i=1:length(B) %numel instead of length would be safer

otherwise your code makes no sense.

On the same level,

winLen=length(V)              %would be 240 for B{1}
energyST = sum(V.^2,winLen)   %would sum along dimension 240, so would sum nothing!

is complete nonsense and produces the same result as:

energyST = V.^2;

To answer your question, this should produce the result that you want:

F = cell(numel(B), 2);  %preallocate result. 
zcd = dsp.ZeroCrossingDetector;   %no need to recreate it at each step of the loop
for i = 1:numel(B)
   V = B{i};                      %simpler and safer than B{i, 1} as it will work whatever the shape of B
   F{i, 2} = step(zcd, V);
   F{i, 1} = someenergyfunctionof(V);
end