Hello! I'm trying to build a lower triangular matrix (with zeros in the diagonal) from a particular dataframe.
The matrix I have to construct has 203 rows and 203 columns and that makes 20503 values to be included within (that's why I can't do it manually). To illustrate the dataframe I have, I'll give you an example of a dataframe and matrix with dimensions 6x6 (to make it shorter!) My dataframe looks more or less like this (but longeeeer): (i= number of row, j=number of column, k=value to be included in the matrix) http://r.789695.n4.nabble.com/file/n4390813/df.png An the matrix I should look like this: http://r.789695.n4.nabble.com/file/n4390813/matrix.png Can anyone help me about how to do it? I'm a new R user, and I've tried several combinations of diag(), lower.tri(), matrix(), etc. without any luck... and I don't know if I'm unaware of a command that can work this out. -- View this message in context: http://r.789695.n4.nabble.com/built-a-lower-triangular-matrix-from-dataframe-tp4390813p4390813.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
