Fix firratio

use interpos after avoiding NaNs, use interpos_nan to do this automatically deployed since now ne_rho does not work

assigned to @amerle

added 1 commit

• f8cc9771 - simplify interpos_nan and use isfinite

Compare with previous version

Should be ok now, I changed to check for isfinite, to catch Inf and Nan, but kept interpos_nan since seems to be the matlab staandard ala nansum

But if you have a better name, can change?

resolved all threads

merged