How to calculate imaginary part of incomplete gamma function in matlab.
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I am calculating the coverage probability of massive MIMO systems. During which i need to calculate imaginary part of incomplete gamma function. But i run code shown below error is:Undefined function 'gammanic' for input arguments of type 'double'.
Error in i_gamma (line 3) y= exp(gammanic(2/a, 2*1i));
Code is as follows
syms y z
a=4;
y= exp(gammanic(2/a, 2*1i));
z =imag(y)
Thanks in advance.
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Accepted Answer
Karan Gill
on 12 Sep 2017
Edited: Karan Gill
on 17 Oct 2017
You can find "gammainc" for imaginary input values using the Symbolic "igamma" function. Carefully read the note in the "Description" on how to do this: https://www.mathworks.com/help/symbolic/igamma.html
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More Answers (1)
John D'Errico
on 11 Sep 2017
Edited: John D'Errico
on 11 Sep 2017
I might point out that gammainc is the name of the incomplete gamma function. Not gammanic. Misspelling a function name tends to work poorly.
Regardless, It looks like gammainc does not accepts complex arguments. As well, the symbolic toolbox does not have an incomplete gamma.
Finally, you state that you need to compute the imaginary part of the GAMMA function. You did not say you need the INCOMPLETE gamma function. So if you really need gamma, why are you apparently trying to use gammainc?
To quote you: "How to calculate imaginary part of gamma function in matlab."
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