I am fairly new to Stata, and am having a problem
using row and column name subscripts to refer to a
single element of a matrix. I must be missing
something fairly obvious, but I can't seem to get it
to work. At the bottom of page 155 of the Stata 7
User's Guide, the following example is given:
generate sdif = dif / sqrt(V["price","price"])
However, when I try to execute this statement (in
Stata 7), I get the following error message:
matrix operators that return matrices not allowed in
this context
r(509);
Can anyone point out to me what my mistake is?
Here is a copy of my Stata log:
. matrix V = (1,2,3\4,5,6\7,8,9)
. matrix colnames V = junk1 junk2 price
. matrix rownames V = junk1 junk2 price
. matrix list V
V[3,3]
junk1 junk2 price
junk1 1 2 3
junk2 4 5 6
price 7 8 9
. input dif
dif
1. 1
2. 2
3. 3
4. 4
5. 5
6. end
. list
dif
1. 1
2. 2
3. 3
4. 4
5. 5
. generate sdif = dif / sqrt(V["price","price"])
matrix operators that return matrices not allowed in
this context
r(509);
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