Scale Matrix to a new range [duplicate]

Answer 1

Does this qualify?

R = [.5 .9];
dR = diff( R );

A =  A - min( A(:)); % set range of A between [0, inf)
A =  A ./ max( A(:)) ; % set range of A between [0, 1]
A =  A .* dR ; % set range of A between [0, dRange]
A =  A + R(1); % shift range of A to R