38 lines
1.2 KiB
Matlab
38 lines
1.2 KiB
Matlab
function CDF = chi2cdf(x, n)
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% chi2cdf CDF of the Chi2 distribution
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% CDF = chi2cdf(x, n) computes, for each element of X, the
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% CDF at X of the chi-square distribution with N degrees of freedom.
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% Original file: statistics/distributions/chi2inv.m
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% Copyright (C) 2013 Dynare Team
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%
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% This file is part of Dynare.
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%
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% Dynare 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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%
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% Dynare 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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%
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% You should have received a copy of the GNU General Public License
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% along with Dynare. If not, see <http://www.gnu.org/licenses/>.
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if (nargin ~= 2)
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error ('chi2cdf: you must give two arguments');
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end
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if (~isscalar (n))
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[retval, x, n] = common_size (x, n);
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if (retval > 0)
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error ('chi2cdf: x and n must be of common size or scalar');
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end
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end
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CDF = gamcdf (x, n / 2, 2);
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end
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