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st: RE: Naming rows of matrix


From   "Scott Merryman" <[email protected]>
To   <[email protected]>
Subject   st: RE: Naming rows of matrix
Date   Wed, 20 Jul 2005 18:35:36 -0500

What you need is the macro expansion operator `=exp' which provides the
inline expression evaluator (see [P] macro).

Here is one way to rename the rows as values of the variable

sysuse auto, clear
keep in 1/10
mkmat mpg, mat(A)

forv i = 1/10 {
	local temp`i' = mpg[`i']
	matname A `=`temp`i''', row(`i') e
	}
matrix list A

Hope this helps,
Scott


> -----Original Message-----
> From: [email protected] [mailto:owner-
> [email protected]] On Behalf Of Herb Smith
> Sent: Wednesday, July 20, 2005 6:09 PM
> To: [email protected]
> Subject: st: Naming rows of matrix
> 
> Suppose I want to label the 12th row of a matrix:	1982-83
> 
> If I assign this value to a local macro, and then use matname, everything
> is fine:
> 
> . local tmp12a="1982-83"
> . matname matrixname `tmp12a', row(12) e
> 
> i.e., when I list the matrix, the label is	1982-83
> 
> This is a silly way to do things, but now consider the problem where a
> label such as 	1982-83		is the 12th case of a variable such
as
> var15 .
> 
> . local tmp12b=var15[12]
> 
> assigns the string	1982-83		to the new local macro, in the
> sense that
> 
> . dis `tmp12b'
> 
> displays	1982-83
> 
> but the command
> 
> . matname matrixname `tmp12b', row(12) e
> 
> results in the label:	var15[12]	being assigned to the 12th row of
> the matrix--not the string associated with this element.
> 
> Is there a workaround for this?
> 
> Or, more generally, is there a simple way to assign the values of a
> variable to the corresponding rows of a matrix (which is what I am trying
> to do here)?
> 
> Thanks in advance,
> 
> --Herb Smith
> 
> 


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