MATLAB Answers

express erf() function as qfunc()

1 view (last 30 days)
stephen williams
stephen williams on 18 Nov 2020
Hello,
I have this script that is looking at intersections between probability density functions, and it gives the answer in term of erf(), which I believe is the correct answer, but I want to have it return the answer in terms of qfunc(). Any ideal how to do that?
Here is an example of an output, including the pretty() version.
ans =
-(1125899906842624*2^(1/2)*pi^(1/2)*(erf(1/(2*n^(1/2))) - 1))/5644425081792261
/ / 1 \ \
sqrt(2) sqrt(pi) | erf| --------- | - 1 | 1125899906842624
\ \ 2 sqrt(n) / /
- ----------------------------------------------------------
5644425081792261
The erf() gets into the stream of results as the result of an integration of an exponential upstream. So in theory I could convert this way
erf(x)= 2*(1-qfunc(x*sqrt(2)))-1
but the erf() is built in, and the integration does nto recognize it being redefined ahead of time.
Any ideas?

Answers (0)

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!