MATLAB: Finding when data in a matrix exceeds a certain value

MATLABmatricesmatrix

Hi,

I am trying to find the onset of damage within a matrix of data. I have subtracted away the standard deviation of the data and am now trying to find where the data is larger than the standard deviation, i.e. greater than 0.

Is there a function in MATLAB that will tell me when the data exceeds 0 and will print the row number?

Thanks

Best Answer

To find the row number where the data exceeds zero, use the find function with two outputs:

x = randi(10, 5, 5)-9;          % Example Data
[xr, xc] = find(x > 0);

The ‘xr’ variable here has the row numbers of all the values that exceed zero. (The corresponding column numbers are in ‘xc’.)

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MATLAB: How to find the index in a row vector where a number exceeds a certain value

Try :

A = 1:100;
lim = 50;
ind = find(A>lim,1); %% Here 1 after comma suggests the first element that is greater than 50

In the above case output should be ind = 51 For more info try

doc find

Hope this helps !

MATLAB: Help with standard deviation 3d matrix

stack_std = reshape(std( reshape( double(YourMatrix), [], size(YourMatrix,3) ) ), 1, 1, []);

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MATLAB: How to find the index in a row vector where a number exceeds a certain value

MATLAB: Help with standard deviation 3d matrix

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