IDL mode

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;; Example IDL code
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FUNCTION mean_and_stddev,array
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  ;; This program reads in an array of numbers
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  ;; and returns a structure containing the
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  ;; average and standard deviation
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  ave = 0.0
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  count = 0.0
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  for i=0,N_ELEMENTS(array)-1 do begin
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      ave = ave + array[i]
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      count = count + 1
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  endfor
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  ave = ave/count
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  std = stddev(array)  
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  return, {average:ave,std:std}
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END
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