Re: st: RE: RE: manipulating string variables

[Jean Eid <jeaneid@chass.utoronto.ca>]

One more question regarding manipulating global macros. Is there a way
to do the following
global  reg1 "reg hours $dem ";
where $dem is defined as

global dem "age sex";

and

global dem1 "age";

now I want to replace $dem with $dem1 in $reg1

All the solutions below do not work since stata attempts to execute the
global macro $dem when calling global macro $reg1.

Any help is greatly appreciated.

Jean



Jean Eid wrote:
> Thank you So much for the prompt reply.
>
> Jean
> Nick Cox wrote:
> > To Alex's clear exposition two footnotes can be added.
> > 1. In Stata terminology, these are not variables at all, but (global) 
> > macros.
> > 2. In Stata 9, -index()- is documented as -strpos()-.
> > Nick n.j.cox@durham.ac.uk
> > Alex Ogan
> >  
> >  
> > > Here are some basic examples:
> > >
> > > . clear
> > >
> > > . global testglobal "hello world, how are you today"
> > >
> > > . display "$testglobal"
> > > hello world, how are you today
> > >
> > > . display index("$testglobal","you")
> > > 22
> > >
> > > . display index("$testglobal","me")
> > > 0
> > >
> > > . global testglobal2 = subinstr("$testglobal","today","tomorrow",.)
> > >
> > > . display "$testglobal2"
> > > hello world, how are you tomorrow
> > >     
> >  
> > Jean Eid
> >  
> >  
> > > Suppose I declare a global variable
> > > global myglobal "hello world, how are you today"
> > >
> > > now what I want to do is the following:
> > > a) see whether the string text today exist in $myglobal
> > > b) replace "today" by "tomorrow"
> > > c) instead of "are" I need to change the "a" to "b" let's say.
> > >
> > > I know this does not make sense to you right now but I have all 
> > > these regressions defined as global variables and need to manipulate 
> > > them.
> > >
> > > Can this be done in Stata?
> > >
> > > I have checked strmatch and the likes but am not able to work it. I 
> > > am looking for something like grep, sub and the likes in Linux.
> > >     
> > *
> > *   For searches and help try:
> > *   http://www.stata.com/support/faqs/res/findit.html
> > *   http://www.stata.com/support/statalist/faq
> > *   http://www.ats.ucla.edu/stat/stata/
> >
> >   

*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/