how can i compute std 2d

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              

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RADWAN A F ZEYADI 2022-2-25

thank you but can i plot them in matrix that explain different colors of std

Walter Roberson 2022-2-25

在 MATLAB Online 中打开

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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