covar

Contents: Description, Arguments, Usage, Examples, Related Functions Supported Under Version: >1.69 Current Davinci Version: 2.27 64-bit Safe: No Description Computes the Covariance matrix of the input data. Arguments and Return Values Arguments: A numeric array and an axis Return Value: A float array of identical size to the input array Usage Syntax: covar(obj = VAL [, axis = {x/y/z}]) The covar() function computes the covariance matrix for the vectors specified in the 'obj' cube. The 'axis' parameter specifies the dimension along with the vectors are laid out. Say, the input 'obj' is an [m x n x w] matrix and the 'axis' has been specified as 'z' then: 'w' is the dimension of the a single input vector, and there are 'm x n' of them in the image cube. The default value for this parameter is 'z'. Examples dv> a 200x200x1 array of byte, bip format [40,000 bytes] dv> c=covar(a,x) 200x200x1 array of float, bsq format [160,000 bytes]

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