>In comp.lang.c++

Actually, it was five different newsgroups (although comp.lang.c++
was one of the five). I have reduced it to just two here.

>Luna Moon <lunamoonmoon@gmail.com> wrote:
>> Here is one function in Matlab that I am having difficulty with
>> translating:
>>
>> isfinite(x)

In article <5ired3F3pi424U2@mid.dfncis.de>
Thomas Richter <thor@math.tu-berlin.de> wrote:
>C99: isinf(x)

This is the wrong test: it checks to see if x is infinite (+Infinity
or -Infinity).

C99 already has an isfinite(), so presumably the original poster
does not have a C99 compiler available.

It can be difficult to write isfinite() on some machines -- those
where (a) you pretty much have to do it in assembly, and (b) an
attempt to pass a "NaN-like" value causes a trap before you can
get to the assembly code in the first place -- but for most modern
IEEE machines, you can write isfinite() yourself if you have to.
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