External Interfaces/API Reference

mxIsInf

True if value is infinite

Fortran Syntax

• integer*4 function mxIsInf(value)
  integer*4 value
  

Arguments

value
   The double-precision, floating-point number that you are testing.

Returns

1 if value is infinite, and 0 otherwise.

Description

Call mxIsInf to determine whether or not value is equal to infinity or minus infinity. MATLAB stores the value of infinity in a permanent variable named Inf, which represents IEEE arithmetic positive infinity. The value of the variable, Inf, is built into the system. You cannot modify it.

Operations that return infinity include:

• Division by 0. For example, 5/0 returns infinity.
• Operations resulting in overflow. For example, exp(10000) returns infinity because the result is too large to be represented on your machine.

See Also

mxIsFinite, mxIsNaN

mxIsFull (Obsolete)

mxIsInt8