SelectNumber
SelectNumber (whichOne, val1, val2 [, val3])
The SelectNumber function returns one of val1, val2, or (optionally) val3 based on the value of whichOne .
SelectNumber(whichOne, val1, val2 ) returns val1 if whichOne is zero, else it returns val2.
SelectNumber(whichOne, val1, val2 , val3 ) returns val1 if whichOne is negative, val2 if whichOne is zero, or val3 if whichOne is positive.
Details
SelectNumber works with complex (or real)val1, val2, and val3 when the result is assigned to a complex wave or variable. (Print expects a real result, see the "causes error" example, below).
If whichOne is NaN, then NaN is returned.
WhichOne must always be a real value.
Unlike the ? : conditional operator, SelectNumber always evaluates all of the numeric expression parameters val1, val2, ...
SelectNumber works in a macro, whereas the conditional operator does not.
Examples
Print SelectNumber(0,1,2) // prints 1
Print SelectNumber(0,1,2,3) // prints 2
wv= SelectNumber(numtype(wv[p])==2,wv[p],0) // replaces NaN's with zeros
// chooses among complex values
Variable/C cx= SelectNumber(negZeroPos,cmplx(-1,-1),0,cmplx(1,1))
// causes error because Print expects a real value (not complex)
Print SelectNumber(negZeroPos,cmplx(-1,-1),0,cmplx(1,1))
// The real function expects a complex result
Print real(SelectNumber(negZeroPos,cmplx(-1,-1),0,cmplx(1,1)))