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Section: Base Constants
Returns feps, which quantifies the relative machine precision of floating point numbers (a machine specific quantity). The syntax for feps is: 
y = feps
 which returns feps for single precision values. For most typical processors, this value is approximately 2^-24, or 5.9604e-8. 
The following example demonstrates the use of the feps function, and one of its numerical consequences.
--> feps ans = 1.1921e-07 --> 1.0f+eps ans = 1