Numerical recipes in parallel Fortran by Press W.H., Teukolsky S.A., Vetterling W.T., Flannery B.P.

By Press W.H., Teukolsky S.A., Vetterling W.T., Flannery B.P.

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963 operating systems, for example, have been very slow in developing; and efficient, parallel methodologies for query-serving on large databases are even now a subject of continuing research. However, things are now changing. We consider it an easy prognostication that, by the first years of the new century, the typical desktop computer will have 4 to 8 user-accessible CPUs; ten years after that, the typical number will be between 16 and 512. It is not coincidence that these numbers are characteristic of supercomputers (including some quite different architectures) in 1995.

For examples of this construction, see amoeba (p. 1208), amebsa (p. 1222), mrqmin (p. 1292), and medfit (p. 1294). Recursion A subprogram is recursive if it calls itself. While forbidden in Fortran 77, recursion is allowed in Fortran 90. 17] You must supply the keyword RECURSIVE in front of the FUNCTION or SUBROUTINE keyword. In addition, if a FUNCTION calls itself directly, as opposed to calling another subprogram that in turn calls it, you must supply a variable to hold the result with the RESULT keyword.

948 [Int] Chapter 21. Introduction to Fortran 90 Language Features floor(a) Convert to integer, truncating towards more negative. Reduction and Inquiry Functions on Arrays These are mostly the so-called transformational functions that accept array arguments and return either scalar values or else arrays of lesser rank. 11] With no optional arguments, such functions act on all the elements of their single array argument, regardless of its shape, and produce a scalar result. When the optional argument dim is specified, they instead act on all one-dimensional sections that span the dimension dim, producing an answer one rank lower than the first argument (that is, omitting the dim dimension from its shape).

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