If I have a matrix of observations, how can I create a new matrix that contains only the rows in which the first element in the row is greater than 0?
1 Answer
0
accepted
The GAUSS function selif will extract rows from a matrix that match a logical expression. For example:
x = { 1 3,
-2 4,
2 1,
7 -9 };
mask = x[.,1] .> 0;
xout = selif(x, mask);
After the code above the variables will have the following values:
x =
1 3
-2 4
2 1
7 -9
mask =
1
0
1
1
xout =
1 3
2 1
7 -9
Your Answer
1 Answer
0
accepted
The GAUSS function selif will extract rows from a matrix that match a logical expression. For example:
x = { 1 3,
-2 4,
2 1,
7 -9 };
mask = x[.,1] .> 0;
xout = selif(x, mask);
After the code above the variables will have the following values:
x =
1 3
-2 4
2 1
7 -9
mask =
1
0
1
1
xout =
1 3
2 1
7 -9