60 lines
1.4 KiB
Objective-C
60 lines
1.4 KiB
Objective-C
## Copyright (C) 2020 Jens
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##
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## This program is free software: you can redistribute it and/or modify it
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## under the terms of the GNU General Public License as published by
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## the Free Software Foundation, either version 3 of the License, or
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## (at your option) any later version.
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##
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## This program is distributed in the hope that it will be useful, but
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## WITHOUT ANY WARRANTY; without even the implied warranty of
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## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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## GNU General Public License for more details.
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##
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## You should have received a copy of the GNU General Public License
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## along with this program. If not, see
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## <https://www.gnu.org/licenses/>.
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## -*- texinfo -*-
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## @deftypefn {} {@var{retval} =} to_param (@var{input1}, @var{input2})
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##
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## @seealso{}
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## @end deftypefn
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## Author: Jens <jens@orion>
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## Created: 2020-10-07
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function p = to_param(x, pmin, pmax, B, k, pcenter, scenter)
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if (pmin == pmax)
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pmax += 1E-9;
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end
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if (k == 0)
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k = 1E-9;
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end
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if ((pcenter < pmin) || (pcenter > pmax))
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pcenter = pmax*scenter + pmin*(1-scenter);
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end
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x = min(1, max(0, x));
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kc = 1/(B^k-1);
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p = [];
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for n=1:length(x);
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s = x(n);
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if (s < scenter)
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s = (scenter-s)/scenter;
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ks = -(pcenter-pmin);
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else
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s = (-scenter+s)/(1-scenter);
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ks = (pmax-pcenter);
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end
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if (B == 1)
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p = [p pcenter + ks*kc*s];
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else
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p = [p pcenter + ks*kc*(B.^(k*s)-1)];
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end
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end
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endfunction
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