On Mon 1-Dec-08 2:46am -0600, Tony Mechelynck wrote:
>
> On 01/12/08 08:39, Bill McCarthy wrote:
> [...]
>> My C docs say a negative number produces a domain error. A
>> zero produces a range error. Assuming these Open Watcom
>> docs are correct, I've specified the argument must be a
>> positive NUMBER or FLOAT, hence my notation (0,inf] - you
>> correctly assumed my "(" means open and "]" means closed for
>> ranges. Of course it may be better to always consider "inf"
>> as open.
>>
>> Please let me know if you spot any errors or a need for
>> clarification.
>>
> Not sure if it was an error, a need for clarification, or both, or neither.
>
> ":echo log(0)" answers -inf
> ":echo log(log(0))" answers nan
> ":echo log(log(log(0)))" still answers nan
> ":echo log( 1. / 0. ) gives three Vim errors (the first of which is
> "E15: Invalid expression: / 0. )"
I build with Make_ming.mak under Windows.
:echo log(0)
-1.#INFe
:echo log(-1)
-1.#INDe
If I write this in C:
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
int main( void )
{
printf("%g\n",log(0.0));
printf("%g\n",log(-1.0));
return EXIT_SUCCESS;
}
Then compile/link with gcc I get:
-1.#INF
-1.#IND
But when I compile/link with Open Watcom I get:
-inf
-nan
This is quite strange, but not the fault of Vim (except
perhaps that 'e' at the end).
--
Best regards,
Bill
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