RESCALE - Rescale data.

Contents

Description
Syntax
Inputs
Outputs
See also
Function implementation

Description

Rescale a cell or array signal in [a,b].

Syntax

y = RESCALE(x);
[y, d] = RESCALE(x, a, b);

Inputs

x : input matrix or cell to rescale.

a, b : (optional) rescaling values; a and b must be scalar; default: a=0, b=1.

Outputs

y : matrix with entries rescaled in the range [a,b].

d : (optional) variable returning the difference max(x(:))-min(x(:)) of the entries in the input matrix x.

See also

Ressembles: CLAMP.

Function implementation

function [y, d] = rescale(x, a, b)

if nargin<3,  b = 1;
    if nargin<2,  a = 0;  end
end

if iscell(x),
    y = x;   d = cell(numel(x),1);
    for i=1:length(x)
        [y{i}, d{i}] = rescale(x{i}, a, b);
    end
    return;
end

m = min(x(:));
M = max(x(:));
d = M - m;

if d<eps,  y = x;
else         y = (b-a) * (x-m) / d + a;
end
end % end of rescale