mxIsInf (External Interfaces Reference)

Determine if input 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

Logical 1 (true) if value is infinite, and logical 0 (false) 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