On Mon, Aug 22, 2011 at 1:27 PM, Phil Steitz <phil.ste...@gmail.com> wrote:
> I think it would be good to add this, but it would probably be > better to give it a different name. What name, I am not sure. > Maybe setAll or fill. Might also be useful to have versions that > fill submatrics. > Mahout allows this via overloading of an assign method. Matrix.assign(double) over-writes all cells with a constant value. Matrix.assign(Matrix) copies data into the target. x.assign(Matrix y, BinaryFunction f) does element-wise x_ij = f(x_ij, y_ij) > Here is a little joke to lighten things up a bit. What if we just > allow people to specify negative indices to mean "everything." So > for example, setEntry(-1, -1, 0) sets all entries to 0, setEntry(1, > -1, 0) sets the first row to 0. Just kidding ;) > Can be useful. I find the TCL convention more useful where -1 refers to the last element of a vector. This sort of thing does tend to freak out the more mathematically inclined and it does make it harder to catch errors in mathematical code since it mutes indexing errors.
