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The production of special function routines for a multi‐machine library

The design requirements for special function routines in a multi‐machine Library such as the NAG library are discussed. The choices made and the conventions adopted to overcome some of the problems that arise in this type of project are outlined. A description is given of the semi‐automatic handling that is done to ease the problem of producing versions of the routines for any reasonable precision of arithmetic. The basic testing procedures are also covered briefly.