David Novakovic wrote: > Hi, > > i'm moving some old perl PDL code to python. I've come across a line > which changes values in a diagonal line accross a matrix. > > matrix.diagonal() returns a list of values, but making changes to these > does not reflect in the original (naturally). > > I'm just wondering if there is a way that i can increment all the values > along a diagonal? >
You can refer to a diagonal using flattened index with a element-skip equal to the number of columns+1. Thus, a.flat[::a.shape[1]+1] += 1 will increment the elements of a along the main diagonal. -Travis ------------------------------------------------------------------------- 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
