Dear all,
Sorry if you received duplicated copy of this email, I
apologize, this is my first time to post here.
i am just starting to use Stata and glad to join this
statalist.
I am now learning to use while looping, but it doesn't
work for me. I myself can't find any problems with the
programe and can anyone here point out what mistake I
made?
For example, I am doing a simple matrix calculation
like A=2*A and construct the following program
prog define test
set trace on
matrix A=J(3,3,1)
matrix list A
version 7.0
local i=1
while 'i'<5 {
matrix A=2*A
local i='i'+1
}
end
The Stata just returns as the following and when I
type 'matrix list A' in the command box, it returns as
'matrix A not found', seems nothing is done by Stata.
prog define test
1. set trace on
2. matrix A=J(3,3,1)
3. matrix list A
4. version 7.0
5. local i=1
6. while 'i'<5 {
7. matrix A=2*A
8. local i='i'+1
9. }
10. end
.
end of do-file
What is the problem I've got? Many thanks for your
kind help.
Xiaotang
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