Hello,
I am hoping for some advice as to how I might create a subset of a matrix. The matrix is 176 x 3530. The rows are individual records and the columns words. I want to create a new matrix that only consists of words which occur in at least 5 records. For example, if column 7 is "charges" and this only appears in 4 records/rows this variable would not be included, whereas if column 109 was the word "monitor" and occurred in 95 records it would be saved into the new matrix. Values in the matrix are numbers, such that if a word does not occur in a record the cell contains a zero, whereas if it occurs 7 times there is a value of 7 for that record. It is the number of records rather than the than the column total that is the criteria for determing inclusion into the matrix.
Any suggestions on how I might reduce the size of this matrix so as to include only those columns in which a word occurs at least in 5 records is much appreciated,
regards Bob ______________________________________________ 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.
