EXP()

[chris319]

Please include Exp() in PureBasic. Thanks again to El_Choni for this example:

Code: Select all

#E = 2.71828182

Procedure.f Exp(value.f)
  ProcedureReturn Pow(#E, value)
EndProcedure

[Lebostein]

And please, please, please add follow functions

- Abs() for integers, best way two functions: Abs() & AbsF()
- Sign()

And this after 5 years PureBasic!! This functions are basic BASIC-functions!

[chris319]

- Abs() for integers, best way two functions: Abs() & AbsF()

IMO there should be just one Abs() which can (or the compiler can) determine whether it is a float or integer.

As for other requests, we should be able to use a variable after Step in a For...Next loop. Requiring the use of a constant is ridiculous. And preferably not StepW and StepF, just Step.

Also requesting FP(). This is part of the ANSI/ISO standard for BASIC (yes, there IS a standard for BASIC). FP stands for Fractional Part and it returns the fractional part of the argument.

If we're going to have Exp() we're going to need Exp10() as well.

[Trond]

As for other requests, we should be able to use a variable after Step in a For...Next loop. Requiring the use of a constant is ridiculous. And preferably not StepW and StepF, just Step.

Image that if all the new variable types that are requested are made! We'll need StepB, StepW, StepF, StepUb, StepUw, StepQ, StepUq, StepD and StepLd! No, let's go for the quickstep.

[Killswitch]

I'm a little confused - what does Exp() actually return (obviously value^#E) but whats it for/do?

[Trond]

I'm a little confused - what does Exp() actually return (obviously value^#E) but whats it for/do?

No idea. http://no.php.net/exp

[chris319]

Sign()

Would you be just as happy with SGN() for compatability with ANSI/ISO and most other BASICs including QB and VB?

[Dr. Dri]

I'm a little confused - what does Exp() actually return (obviously value^#E) but whats it for/do?

If you lack some skills for math understanding, it's no big deal...
For example Exp() can be used to calculate Pow()

Code: Select all

Procedure.f Exp(x.f)
  Protected r.f, t.f, i.f
  
  If x >= 0
    r = 1.0
    t = 1.0
    
    While t
      i + 1.0
      t * x / i
      r + t
    Wend
  Else
    r = 1/Exp(-x)
  EndIf
  
  ProcedureReturn r
EndProcedure

x.f = 0.485714
y.f = 1.421053

Debug StrF(Pow(x, y), 17)
Debug StrF(Exp(y*Log(x)), 17)

Dri

[Intrigued]

we should be able to use a variable after Step in a For...Next loop.

I ran into "needing a variable and not the Constant" deal-e-o in a For..Next loop myself. I second this one!