Calculation of Poisson distribution in C

Question

I need a C function to calculate Poisson distribution for values of k upto 720. I need a highly efficient solution. I urgently need this solution. Thanks in advance

Answer 1

give a to try GSL: gsl_ran_poisson_pdf

Answer 2

If you want to calculate it yourself instead of using a library You can calculate it using the formula.. e^k*e^(-lambda)/k!
you can use log(n!) = log(n)+log(n-1!) and dynamic programming