Indexing all the row data for each column

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Vin
Vin 2021-6-23
回答： millercommamatt 2021-6-23
Hi everyone,
For example, if I had a matrix with 10 rows but variable column lengths for each row how would I iterate "for all row datapoints within each column"?
Right now using A(1:end,1:end) returns the entire matrix, but I would need to isolate each column of data.
Thank you in advance
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Rik
Rik 2021-6-23
You can't have non-rectangular arrays in Matlab.
You can approximately get the same effect by using a cell array, or by padding with NaN. The most optimal strategy will depend on what you want to do.
Vin
Vin 2021-6-23
Sorry, I will try to be more clear.
The matrix would be 10x15 (15 being the most amount of actual data within a column), all other columns within the matrix that have less than 15 rows are padded with NaN.
Each column of data represents a waveform. My intentions would be to normalize all 10 columns of data from 0-100% to make all columns the same length.

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millercommamatt
millercommamatt 2021-6-23
For a 2D matrix, you can access a row as follows:
% Matlab indexing is row major
% return single row of matrix A
A(1,:)
A(2,:)
A(end,:)
%return single column of A
A(:,1)
A(:,2)
A(:,end)

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