How to compute the standard deviation of each column in a matrix?
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I have some code that creates a matrix of data points and then computes the average value for each column and plots these average values. However, I want to add some error bars to my graph where each error bar represents the standard deviation across each column entry in the original matrix. Is there a concise way to compute the standard deviation for each column so that I can store it and use these standard deviations to make a plot (using something like 'errorbar(x, y, err)'? Thanks!
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the cyclist
am 27 Aug. 2021
Bearbeitet: the cyclist
am 27 Aug. 2021
If A is your array, then
s = std(A)
is a row vector, where each element is the standard deviation of the corresponding column. See the documenation for std for details.
Also, be sure to be clear about whether your error bars represent the standard deviation or the standard error of the mean.
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the cyclist
am 29 Aug. 2021
You could use the isnan function to keep track of how many elements are NaN. So, calculate the standard deviation, and divide by the square root of the number of elements that are not NaN.
Steven Lord
am 28 Aug. 2021
To be certain that you're taking the std over each column, specify the dim input argument as described on the documentation page for the std function.
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