Excluding NAN entries when summing an array

[RS]

Hi all, what is a safe and efficient way to sum the contents of an array
or a matrix, skipping any possible NANs or INFs?

Thanks,
RS

 

[Jacek Dziedzic]

Hi all, what is a safe and efficient way to sum the contents of an array
or a matrix, skipping any possible NANs or INFs?

The NaN has this queer property that if x is a NaN, then
x!=x. Therefore you may skip NaNs with something like

for(...) {
if(myarray!=myarray) // skip this entry, a NaN
}


HTH,
- J.