[fpc-pascal] Two "double" related question

[Xiangrong Fang]

Hi All,

I am trying to convert an R program to pascal. Having 2 problems:

1. In R, ln(0) is -Inf (negative infinity) and ln(-1) is NaN, while in FPC
(2.6.2), ln(0) is NaN, and ln(-1) is -Inf, why? Mathematically, I think R's
rationale is better because ln(x) approaches -Inf while X approaches 0.

2. How can I tell the compiler NOT to generate EDivideByZero or any similar
stuff, but just return the IEEE Infinity NegInfinity or Nan accordingly? I
know that they are defined in the math unit.

Thanks!

Xiangrong
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