How can I calculate the Chi-Squared CDF if I use MATLAB C-Coder?
2 次查看(过去 30 天)
显示 更早的评论
My MATLAB function file calls "chi2cdf", and I need to convert the script to C. The MATLAB C-Coder tool does not support the use of chi2cdf (and also does not support the use of plain cdf, either). Do any of you know of a work-around?
0 个评论
回答(1 个)
Mike Hosea
2013-9-11
This function is now supported for code generation in R2013b.
2 个评论
Mike Hosea
2013-9-11
编辑:Mike Hosea
2013-9-11
I have no way of knowing whether you are under a maintenance agreement or not. Many users can upgrade when new releases come out. Since you apparently cannot, note that GAMMAINC is supported, and GAMMAINC will compute what is referred to as the "regularized gamma function" here
So, you could do it this way.
function p = mychi2cdf(x,a)
p = real(gammainc(max(x,0)/2,a/2));
I don't know if you cared about the possibility of negative x, but the MAX call takes care of that possibility. The wrapping with real() is only there because the output of GAMMAINC is always complex with MATLAB Coder, and we know that the imaginary part will be zero with non-negative real inputs.
另请参阅
产品
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!