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What does |x| mean in the erf function?

Thread starter moonman239
Start date Sep 11, 2010
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moonman239

Thread starter
Sep 11, 2010

#1

Here's the equation I'm using: erf(x) = x/|x| * SQRT(1 - exp(-x²*(4/pi + (ax)²) / (1 + ax²)

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awkward

Sep 11, 2010

#2

moonman239 said:

Here's the equation I'm using: erf(x) = x/|x| * SQRT(1 - exp(-x²*(4/pi + (ax)²) / (1 + ax²)

|x| is the absolute value of x.

x/|x| is 1 for positive x, -1 for negative x.

(However, I don't recognize that equation for erf.)

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