how to make polyfit on call arrays?
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hello
i have a b=cell(1,32). each cell in b contains a matrix of three rows but, the number of columns may differ from one cell to other. cell contents are double arrays.i want to extract second row of cells, punch them together and save it in one column of a matrix. also for the third row the same procedure is needed and finally polyfit them against each other.
any idea?
thanks.
2 Comments
Cris LaPierre
on 10 Apr 2019
Edited: Cris LaPierre
on 10 Apr 2019
What does 'punch them together' mean? How do you plan to save multiple columns of data into a single column?
You say you want to do the same procedure for the third row. Again, how do you plan to put multiple columns of data into a single column? And where are you saving this? The second column of your matrix?
It might be easiest if, for a sample cell of data (3xn matrix of doubles), you show us an example of what you want the code to do.
Accepted Answer
Guillaume
on 10 Apr 2019
It sounds like by punch you mean horizontally concatenate. In which case, what you want is easy to do:
%b a cell array of 3xN matrices
joined = [b{:}]; %can also use cell2mat(b) iif b is a row vector cell array
polyfit(joined(:, 3), joined(:, 2), degree)
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