On 7/12/06, JJ <[EMAIL PROTECTED]> wrote: > 2) It would be very convienient to have some simple way to delete selected > columns of a matrix. For example, in matlab the command is X[:,[3,5,7]]=[] to > delete the three selected columns. It would be nice if such a command would > also work with selections, as in X[:,A[0,:]<4] = [], where X and A are > matrices.
+1. In R negative integers are used for this purpose and a copy of the array is returned. e.g. > x = 1:10 > x [1] 1 2 3 4 5 6 7 8 9 10 > x[-1] [1] 2 3 4 5 6 7 8 9 10 > x[c(-1,-2)] [1] 3 4 5 6 7 8 9 10 > x[-c(1,2)] [1] 3 4 5 6 7 8 9 10 I like the current use of negative indices in numpy, but I do find myself missing the ability to easily make a copy of the array without certain indices. Mike ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Numpy-discussion mailing list Numpy-discussion@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/numpy-discussion
