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st: RE: How to prevent truncated string in macro expression


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: How to prevent truncated string in macro expression
Date   Tue, 11 Jul 2006 20:33:46 +0100

You're correct.  

local temp4 : subinstr local varlist " " ",", all 

Start with 

. help macro

and then click on "extended_fcn". 

However, I wouldn't do what you want to do that way. 
If you are bitten by what you feed to -subinstr()-, 
you will be bitten sooner or later by what you feed
to -missing()-. 

What you want can be done by calling -egen, rowmiss()-
or -- a little more efficiently -- by 
something like 

tempvar ismiss
gen byte `ismiss' = 0 
qui foreach v of local varlist {
	replace `ismiss' = max(`ismiss', missing(`v') & `touse') 
} 
qui count if `ismiss'

Nick 
n.j.cox@durham.ac.uk 

Grealy, Patrick J

> I am having trouble with the limit for string lengths in 
> expressions and
> have not been able to find the solution. I'm sure I've seen 
> it somewhere
> and suspect it involves using the colon(:) instead of 
> equals(=) method.
> Here's the relevant section of code from my .ado file for a program
> that, among other things, attempts to count the number of missings for
> any of the input variables:
> 
> local temp4=subinstr("`varlist'"," ",",",.)
> quietly count if missing(`temp4') & `touse'
> 
> I replace spaces in varlist with commas and save in a local macro and
> use it as the argument for the missing function. This works 
> fine until I
> use too many variables and exceed the string limit. Can 
> someone help me
> with a method to get the macro to include the entire string?

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