16 lines
317 B
Matlab
16 lines
317 B
Matlab
function f = dgamma(x,a,b)
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%DGAMMA The gamma density function
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%
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% f = dgamma(x,a)
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% Anders Holtsberg, 18-11-93
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% Copyright (c) Anders Holtsberg
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if any(any(a<=0))
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error('Parameter a is wrong')
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end
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f = (x./b) .^ (a-1) .* exp(-x./b) ./ (b.*gamma(a));
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I0 = find(x<0);
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f(I0) = zeros(size(I0));
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