how can i compute std 2d

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RADWAN A F ZEYADI
RADWAN A F ZEYADI 2022-2-25
评论： Walter Roberson 2022-2-25
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 个评论
Walter Roberson
Walter Roberson 2022-2-25
Could you give an example of what you would like the output to look like?
RADWAN A F ZEYADI
RADWAN A F ZEYADI 2022-2-25
like this image that explain the std

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回答（1 个）

Walter Roberson
Walter Roberson 2022-2-25
编辑：Walter Roberson 2022-2-25
Ran in:
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
Name Size Bytes Class Attributes data 51x71 28968 double std_along_columns 1x71 568 double std_along_rows 51x1 408 double std_overall 1x1 8 double
  2 个评论
RADWAN A F ZEYADI
RADWAN A F ZEYADI 2022-2-25
thank you but can i plot them in matrix that explain different colors of std
Walter Roberson
Walter Roberson 2022-2-25
Ran in:
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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