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Re: st: Beginning question
From
Nick Cox <[email protected]>
To
"[email protected]" <[email protected]>
Subject
Re: st: Beginning question
Date
Tue, 9 Apr 2013 00:44:45 +0100
It's difficult to improve on the help here.
I use -capture- [no SHOUTING please] when something might lead a
program to fail, but I want to trap the failure, including the error
message.
It's usually an example of the Yogi Berraism, "When you come to a fork
in the road, take it".
For example, I test for something being numeric -- if so, I do one
thing -- if not (it's string), I do another thing.
confirm numeric var myvar
would lead a program to fail if the assumption was wrong, but I don't
want that. I have a back-up plan. For example, I might -encode- the
string variable so that I have something numeric to work with. So, I
capture confirm numeric var myvar
if _rc {
<back-up plan goes here goes here>
}
-if _rc- is going to be true (non-zero) if the return code _rc is non-zero.
-capture- is also often used with -assert-.
-capture- is also often used when you don't want the default error
message, but to substitute your own.
Nick
[email protected]
On 8 April 2013 21:55, Hurley, Sharon <[email protected]> wrote:
> I am transistioning from SAS. The one thing I don't get is when is
> CAPTURE used? It seems very arbitrary at the moment.
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