Find slope across columns of cell
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I have a 220x4 cell (a) consisting of numerical data and would like to find the (linear) slope across the four values in row one, then the four values in row two, and so on, so that I would end up with 220 different slopes that I could then save. Thanks in advance!
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Accepted Answer
Bob Thompson
on 4 Jan 2019
How are you organizing the data into ordered pairs? I'm assuming that by 'numerical data' you mean you have cells that contain individual doubles.
data = cell2mat(a);
for i = 1:size(a,1)
slope(i) = polyfit(x_vals,data(i,:),1);
end
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Bob Thompson
on 7 Jan 2019
for i = 1:size(a,1);
pairs = [];
pairs(:,1) = counter;
pairs(:,2) = data(i,:);
pairs = pairs(~isnan(pairs(:,2),:);
slope(i) = polyfit(pairs(:,1),pairs(:,2),1);
end
This might not quite do it, the logic indexing to remove NaNs might be slightly off, but it should get you going at least.
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