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erf
float
erf is NOT undoable, NOT queryable, and NOT editable.
Returns the error function of the argument, call it x, defined as:(2 / sqrt(pi)) integral{0 to x} of (e ** -t **2) dt.
This command is implemented using the builtin system functions.
Special Note:
There is also an erfc command which returns 1.0 - erf(x),
and is provided because of the extreme loss of relative
accuracy if erf(x) is called for large x and the result
subtracted from 1.0 (e.g., for x = 10, 12 places are lost).
| float | Error value |
// Return the error function of 1.0 erf 1.0; // Result: 0.842701 //