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sdev (replaces TSdev) The sdev function returns the standard deviation of a 1-dimensional array, CImage , or list of numbers. The parameters must contain numbers or strings that can be converted to numbers. This function is similar to the CStat:Sdev method but does not require calling new_stats() beforehand to create a CStats object. Whereas this function operates on a pure (indexed) array, the slightly slower sdevn function operates on a general table that may be a multi-dimensional array or contain a mixture of numbers, strings, named keys, and sub-tables. The related sdevxn function computes the standard deviation about a specified value for a general table. SyntaxnStdDev = sdev( Data )
RemarksExcept for the CImage class, the members of Data are interpreted as numbers with pixel type "double". The CImage class supports values ranging from byte to double plus other pixel types. ExamplesThe following script returns the standard deviation of a table containing 1 million random numbers.
The next script returns the standard deviation for pixels inside a rectangle at the corner of a CImage.
The next example computes the standard deviation of a list of numbers:
Related Topics
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