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# isinf

Purpose
Test whether a real value is an infinity.
Synopsis
`function isinf(r: real):boolean`
Argument

r | The value to test

Return value
true if the value is INFINITY or -INFINITY.
Further information
When the parameter matherr is set to true (see setparam) mathematical functions return the constant NAN or INFINITY instead of failing. This function can be used to identify incorrect results (direct comparison to NAN or INFINITY always fails).
Related topics
setmatherr, isnan, isfinite.
Parent Topic Predefined functions and procedures

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