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Susan said
I would like to create a binary matrix (say matrix B) using
the existing information from current matrix A.
Specifically, for each cell (i,j) of matrix B, I want to
replace its value with 1 if the value of the corresponding
cell (i,j) of matrix A is less than the specified threshold
value. In other words, matrix B[i,j] = 1 if A[i,j] <
THRESHOLD.
No subscripting required:
--------------------------------
mata: mata clear
mata:
void underbar(string scalar mat,
real scalar thresh)
{
st_matrix("B", (st_matrix(mat) :< thresh))
}
end
sysuse auto,clear
qui reg price trunk weight length turn
mat list e(V)
mata: underbar("e(V)",0.0001)
mat list B
-----------------------------------
You could pass the name of the result matrix to Mata as well if you
wanted this to be a bit more general.
Kit Baum, Boston College Economics and DIW Berlin
http://ideas.repec.org/e/pba1.html
An Introduction to Modern Econometrics Using Stata:
http://www.stata-press.com/books/imeus.html
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