Re: st: strange behavior of booleanfunctions in dialog if expressions

[Kevin Crow <kcrow@stata.com>]

Zurab was trying to see if a value passed to an edit box in his dialog was <= 0. 
 The problem is that edit boxes return strings, not numeric values.  Zurab will 
need to convert the value in the edit box to a double to use –isle()- correctly. 
 For example,

VERSION 9

POSITION . . 300 300

SCRIPT PREINIT
BEGIN
	create DOUBLE x
END

DIALOG main
BEGIN
 EDIT ed_ed1  30 44 170        ., label("input") numonly
BUTTON bt_bt1 30 100 100 ., label ("button") onpush(program action)
END

PROGRAM action
BEGIN
	call x.setvalue class main.ed_ed1.value
	if x.isle(0) {
		stopbox note "true"
		exit
	}
	stopbox note "false"

END

Kevin Crow
--StataCorp


Zurab Sajaia wrote:

> Dear all,
>
> I have encountered this problem in both Stata version 9.2 and 10 and not 
> sure whether I'm doing something wrong or it's indeed strange.
>
> The setup is as follows:
> I have a (numeric) parameter entered by a user and before executing need 
> to check it's values to be in some range... so something like this example:
>
> VERSION 9
>
> POSITION . . 300 300
>
> DIALOG main
> BEGIN
>  EDIT ed_ed1  30 44 170        ., label("input") numonly
> BUTTON bt_bt1 30 100 100 ., label ("button") onpush(program action)
> END
>
> PROGRAM action
> BEGIN
>  if main.ed_ed1.isle("0") {
>   stopbox note "true"
>   exit
>  }
>  stopbox note "false"
> END
>
> I have here -isle- function but same happens with -islt-, -isgt-, and 
> -isge- as well.  The problem arises with numbers (-1, 1), if I put them 
> with leading 0 (like 0.9 or -0.3) everything looks fine but if I put .9 
> or -.3 instead then -islt- and -isle- give wrong answer for positive 
> fractions and -isgt- and -isge- make mistakes with negatives.
>
> Does anyone have experienced something similar?
>
> any thoughts would be appreciated.
> Zurab
>
>
> *
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