how can i compute std 2d
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Hi
iwould like to ask how can i obtain std along all the rows and columns as culored image that explain the values of std
the matrix dimension is 51 71 any suggestion ?
thanks
2 Comments
Walter Roberson
on 25 Feb 2022
Could you give an example of what you would like the output to look like?
Answers (1)
Walter Roberson
on 25 Feb 2022
Edited: Walter Roberson
on 25 Feb 2022
data = randn(51, 71).*rand(51,71); %just some data
std_along_columns = std(data, [], 1); %one result for each column
std_along_rows = std(data, [], 2); %one result for each row
std_overall = std(data(:)); %over entire array
whos
2 Comments
Walter Roberson
on 25 Feb 2022
You cannot. std means standard deviation which is property of groups of data, not of individual points. For example you can take the standard deviation along the rows and do a line plot of that.
In order to have a 2 dimension array of standard deviation results, you would have need to have started with a 3D array. For example,
cmap = flipud(hot(64));
data = sort(randn(51, 71, 83) .* rand(51, 71, 83),1); %just some data
s = std(data, [], 3);
imagesc(s); colormap(cmap)
colorbar()
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