[SciPy-user] mapminmax function?
Scott MacDonald
scott.p.macdonald@gmail....
Sun Jan 4 16:54:18 CST 2009
Oops, I guess that information would have been helpful. The description:
% MAPMINMAX processes matrices by normalizing the minimum and maximum
values
% of each row to [YMIN, YMAX].
% MAPMINMAX(X,YMIN,YMAX) takes X and optional parameters,
% X - NxQ matrix or a 1xTS row cell array of NxQ matrices.
% YMIN - Minimum value for each row of Y. (Default is -1)
% YMAX - Maximum value for each row of Y. (Default is +1)
% and returns,
% Y - Each MxQ matrix (where M == N) (optional).
% PS - Process settings, to allow consistent processing of values.
% Examples
%
% Here is how to format a matrix so that the minimum and maximum
% values of each row are mapped to default interval [-1,+1].
%
% x1 = [1 2 4; 1 1 1; 3 2 2; 0 0 0]
% [y1,ps] = mapminmax(x1)
%
% Next, we apply the same processing settings to new values.
%
% x2 = [5 2 3; 1 1 1; 6 7 3; 0 0 0]
% y2 = mapminmax('apply',x2,ps)
%
% Here we reverse the processing of y1 to get x1 again.
%
% x1_again = mapminmax('reverse',y1,ps)
%
% Algorithm
%
% It is assumed that X has only finite real values, and that
% the elements of each row are not all equal.
%
% y = (ymax-ymin)*(x-xmin)/(xmax-xmin) + ymin;
On Sun, Jan 4, 2009 at 2:12 PM, Robert Kern <robert.kern@gmail.com> wrote:
> On Sun, Jan 4, 2009 at 13:53, Scott MacDonald
> <scott.p.macdonald@gmail.com> wrote:
> > I was wondering if there is a function analogous to Matlab's mapminmax
> (in
> > the neural network toolbox)?
>
> What does it do?
>
> --
> Robert Kern
>
> "I have come to believe that the whole world is an enigma, a harmless
> enigma that is made terrible by our own mad attempt to interpret it as
> though it had an underlying truth."
> -- Umberto Eco
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>
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