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38 Cray T3E User’s Guide
You can also use the NAG on-line documentation on Cypress by the
command
naghelp
4.5 The IMSL subroutine library
The IMSL library is another general purpose mathematical subroutine
library with two separate parts, MATH/LIBRARY and STAT/LIBRARY.
The release installed on the T3E is the IMSL FORTRAN 90 MP Library
version 3.0.
What has been stated about the precision of arithmetic operations above
applies here as well: programs should introduce nominally only single
precision (real) variables, even though all calculations are carried out in
8 byte operations.
Before running any application programs which use the IMSL routines
you must give the initialization command
use imsl
After this, compilation and linking take place as follows:
f90 -o prog prog.f90 -p$MODULES_F90 $LINK_F90 -Xm
Note: when calling IMSL routines one must specify the non-malleable
option -Xm, because the IMSL library is compiled for fixed one processor.
IMSL is documented in a four-volume manual. Unfortunately, IMSL offers
no on-line documentation on the T3E. However, one can access the the
hypertext help system for IMSL on Caper Cypress and Cypress2 with the
command
imsl.help
and the text-based help system on Cray C94 by
imsl.idf
There is also a large collection of example codes in the directory
$DOC/imsl_examples/
4.6 More information
Chapter 5 discusses Fortran programming in more detail and Chapter 6
C and C++ programming.
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