Re: [R] Help with R Function writing for Matrix

Try this: > x <- matrix(1:40,ncol=5) > # function to find zero rows > f.zero <- + function(arr) + { + which(apply(arr, 1, function(z) all(z == 0)))[1] # first one + } > > # now the non-zero rows > f.nonzero <- + function(arr) + { + which(apply(arr, 1, function(z) any(z != 0))) + } > > f.z

Re: [R] Help with R Function writing for Matrix

Dear all, I have a task to find the first all zero row of a matrix X ( nothing known about X). I need to write a function which returns either the row index of the first all-zero row, or NA if there are no all-zero rows. and I also need to locate all rows which are non-zero (should be a vector of