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st: help with mata's st_sview


From   Mike Wazowski <mike.wazowski@ymail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: help with mata's st_sview
Date   Fri, 3 Jul 2009 20:42:55 -0700 (PDT)

dear statalisters,

i am puzzled by the following behavior:

i use st_sview to access a stata variable and change it internally within mata.  however, i am not able to "stretch" a string variable above its storage type, for example, "make" in auto.dta is stored as str18 but if i want to change it within mata to something longer than 18 chars, the new string gets truncated to 18 chars.  the following code illustrates this behavior:

sysuse auto, clear
keep in 1/5
list make
d make
mata:
st_sview(x,.,"make")
x[.,.]=x*2
x
end
list make
replace make = "01234567890123456789" in 1
list make

as you can see, when i issue -replace- in stata, "make" is automatically promoted to str20.

how can i promote a sting var from within mata to a longer string?

thanks,

mike

ps. the same behavior happens with st_sstore:

sysuse auto, clear
keep in 1/5
list make
d make
mata:
st_sstore(2,"make","01234567890123456789")
end
list make







      


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