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% Copyright (C) 2008 VZLU Prague, a.s., Czech Republic
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% Author: Jaroslav Hajek <highegg@gmail.com>
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% This file is part of NLWing2.
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% NLWing2 is free software; you can redistribute it and/or modify
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% it 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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% This program is distributed in the hope that it will be useful,
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% but 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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% You should have received a copy of the GNU General Public License
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% along with this software; see the file COPYING. If not, see
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% <http://www.gnu.org/licenses/>.
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% @deftypefn{Function File} {[a0, amax, clmax] =} liftanalyze (al, cl)
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% analyzes a lift curve. Searches for a zero-lift and max-lift
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function [a0, amax, clmax] = liftanalyze (al, cl, pn = '')
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wpref = strcat ("liftanalyze (", pn, "): ");
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wpref = "liftanalyze: ";
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warning ([wpref, "polar starts at positive lift"]);
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[clmin, imin] = min (cl);
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[clmax, imax] = max (cl);
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if (any (cl(imin+1:imax) < cl(imin:imax-1)))
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warning ([wpref, "multimodal lift curve"]);
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if (imax == length (cl))
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warning ([wpref, "maximum lift at end of lift curve"]);
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a0 = interp1 (cl(imin:imax), al(imin:imax), 0, "extrap");