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st: Problem with macro: -twoway scatter- type mismatch


From   Friedrich Huebler <huebler@rocketmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Problem with macro: -twoway scatter- type mismatch
Date   Mon, 20 Nov 2006 13:14:54 -0800 (PST)

I use Stata 8.2 and built up a long macro in a loop. The macro is not
accepted by the -twoway- command and instead I get a "type mismatch
r(109);" error message. The problem can be reproduced with the auto
dataset.

. sysuse auto
. local scatter "(scatter mpg weight if make=="VW Diesel",
connect(l)) (scatter mpg weight if make=="AMC Pacer", connect(l))"
. twoway `"`scatter'"'
type mismatch
r(109);

It is possible to display the contents of the macro.

. di `"`scatter'"'
(scatter mpg weight if make=="VW Diesel", connect(l)) (scatter mpg
weight if make=="AMC Pacer", connect(l))

It is also possible to draw the graph by typing the complete -twoway-
command.

. twoway (scatter mpg weight if make=="VW Diesel", connect(l))
(scatter mpg weight if make=="AMC Pacer", connect(l))

Why does the macro not work with -twoway-? Can the problem be solved
by adding more quotes somewhere?

Friedrich


 
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