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Re: st: Mata and nested loops...Thanks
Phillippe,
How is it that one can look at something
repeatedly and miss something like that?
Thanks so much for taking the trouble to
point out my error.
Dave Harless
philippe van kerm wrote:
Dave
The answer is probably not where you are looking for it:
Your first example reads
"for (j=1, j<=3, j++) {"
where it should be
"for (j=1; j<=3; j++) {"
as in your second example.
Philippe
-------------------------------
st: Mata and nested loops
From David Harless <[email protected]>
To [email protected]
Subject st: Mata and nested loops
Date Fri, 24 Feb 2006 09:09:08 -0500
In answering a question on assigning rows of a matrix using -for-
(http://www.stata.com/statalist/archive/2005-11/msg01018.html),
Ben Jann gave an example
mata
A = (1,2,3\4,5,6)
C = J(2,3,.)
for (i=1; i<=2; i++) {
C[i,.] = A[i,.]
C[i,.] // display
}
end
I tried to make a simple modification to this so that each element in
the matrix was assigned in nested -for- loops rather than assigning a
row at a time.
mata
A = (1,2,3\4,5,6)
C = J(2,3,.)
for (i=1; i<=2; i++) {
for (j=1, j<=3, j++) {
C[i,j] = A[i,j]
}
}
C
end
But this generates the error:
unexpected end of line
--------------------------------------------
r(3000);
end of do-file
r(3000);
The nested loop works fine in other simple examples such as
mata
C = J(2,3,.)
for (i = 1; i<=rows(C);i++) {
for (j = 1; j<=cols(C);j++) {
C[i,j] = i+j
}
}
C
end
But not when I make the element by element assignment C[i,j] = A[i,j]
above.
Thanks for your consideration,
Dave Harless
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