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Section: Mathematical Functions
Computes the error function for real arguments. The erf function takes only a single argument 
y = erf(x)
 where x is either a float or double array. The output vector y is the same size (and type) as x. 
The erf function is defined by the integral:
![\[ \mathrm{erf}(x) = \frac{2}{\sqrt{\pi}}\int_{0}^{x} e^{-t^2} \, dt, \]](form_69.png) 
and is the integral of the normal distribution.
Here is a plot of the erf function over the range [-5,5].
--> x = linspace(-5,5);
--> y = erf(x);
--> plot(x,y); xlabel('x'); ylabel('erf(x)');
which results in the following plot.
