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]

RS wrote:

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[i]!=myarray[i]) // skip this entry, a NaN
}
HTH,
- J.