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# isfinite

Purpose
Test whether a real value is finite.
Synopsis
`function isfinite(r: real):boolean`
Argument

r | The value to test

Return value
true if the value is neither (-)INFINITY nor NAN .
Further information
The call isfinite(v) is equivalent to (not isnan(v) and not isinf(v)).
Related topics
setmatherr, isnan, isinf.
Parent Topic Predefined functions and procedures

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