Introduction to Procedures

The first question should be: ``Do we really need to write a procedure?''

Functionality often exists,

• intrinsics, Fortran 90 has 113,
• libraries, for example, NAg fl90 Numerical Library has 300+, BLAS, IMSL, LaPACK, Uniras
• modules, number growing, many free! See WWW.

Library routines are usually very fast, sometimes even faster than Intrinsics!

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