Re: st: odd behavior in ado file

[James Muller <james.muller@internode.on.net>]

Note that in the else part of the control you're calculating 
(exp(1)-1)/ln(1), not (exp(1)-1)/ln(exp(1)). Just a little typo.

James


Katsuhide Isa wrote:


> Dear Statalisters,
>
> I wrote the following simple ado file.
>
> /*----------myboxcox.ado----------*/
> program define myboxcox
> version 7
> local y = exp(`1')
> if `y' == 1 {
>   di in gr "f = " 1
>   }
> else {
>   local f = (`y' - 1)/ln(`1')
>   di in gr "f = " "`f'"
>   }
> end
> /*----------myboxcox.ado----------*/
>
> It works well all in all. But it sometimes shows an odd 
> behavior. 
> More specifically, when typed - myboxcox 1 - (namely, setting 
> the argument as 1), the result is ". "(missing?), not 1.7182818 
> (=(exp(1) - 1)/ln(exp(1))).
>
> When directly typed in the command line as 
> - di (exp(1) - 1)/ln(exp(1)) -, the result is 1.7182818, 
> which is just as it should be.
>
> I don't see why such a phenomenon occurs.
>
> Any suggestions welcome.
> Thanks in advance.
>
> K.I.
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