diff options
Diffstat (limited to 'txr.1')
| -rw-r--r-- | txr.1 | 28 |
1 files changed, 28 insertions, 0 deletions
@@ -49198,6 +49198,34 @@ must evaluate to a list. That list is integrated into the surrounding list. .SS* Math Library + +The following documentation describes the behavior of the Math Library +functions as they apply to the native numeric and character types. + +The functions also support application-defined structure types. +That feature is not described here but in the section User-Defined +Arithmetic Types. + +When one or more operands of a Math Library function is a user-defined +arithmetic structure, no conversions are performed on the operands, +and the stated restrictions do not apply. The operands are passed to +the methods as described in the User-Defined Arithmetic Types section. +The operands need not be numeric. + +User-defined arithmetic structures can work with operands which +are not numbers. If +.code a +is such a type, it is possible for an expression such as +.code "(+ a \(dqabc\(dq)" +to be meaningful and correct. Similarly, it is possible for an +apparent division by zero such as +.code "(/ a 0)" +to be meaningful and correct, since the +.code / +method of the +.code a +object decides how to handle zero. + .coNP Functions @, + @ - and @ * .synb .mets (+ << number *) |