Value of infinity
Call mxGetInf to return the value of the MATLAB® internal inf variable. inf is a permanent variable representing IEEE® arithmetic positive infinity. Your system specifies the value of inf; 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.