# R-alpha: pow_ii

**Paul Gilbert
**
pgilbert@bank-banque-canada.ca

*Thu, 28 Aug 1997 12:01:05 -0400*

>>* I'm a bit confused about this discussion, but since I don't have f2c on
*...
>*A lot of Fortran code doesn't require any libf2c routines. When routines
*>*are needed the most common ones are the exponentiation routines pow_dd,
*>*pow_ii and pow_di (pow_ri is for single precision reals and so is less
*>*needed in R, which uses double precision). However, *some* fortran code,
*...
Thomas
>*From your previous response to my confusion I guessed I would be ok
*with pow_ii, but that does not seem to be the case:
R
...
>* dsecurve.function.tests(verbose=T)
*Random number generator tests ...ok
DSE curvature test 1 ... ld.so.1: /R/bin/R.binary: fatal: relocation error: symbol not found: pow_ii: referenced in /dse/dsefor.so
Killed
[4] /R : nm bin/R.binary | grep pow
[146] | 244556| 312|FUNC |LOCL |0 |7 |complex_pow
[2557] | 1462800| 0|FUNC |GLOB |0 |UNDEF |pow
[2795] | 1053360| 68|FUNC |GLOB |0 |7 |pow_dd
[2800] | 1053124| 236|FUNC |GLOB |0 |7 |pow_di
[377] | 1474036| 4|OBJT |LOCL |0 |15 |powerSymbol
[5] /R :
[5] /R : R
This leads me to wonder how R calculates powers and exp for complex
numbers. I presume that if I can arrange to call the same routines then
I can avoid the extra burden of having to include parts of libf2c with
my distributed code. Do you know what R uses and can I call these from
fortran?
Paul Gilbert
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