Re: About diagonal matrices

[John W. Eaton]

On 22-Feb-2009, Jaroslav Hajek wrote:

| >  * There is a function to coerce a full matrix to a diagonal matrix.
| >    It should require that all off-diagonal elements are numerically
| >    zero.  This is not the same as the current diag function.
| 
| I don't understand this point? Why is such a function needed?

Currently you can do things like

  sparse (x)

to create a sparse matrix from X.  It seemed to me that it would be
useful to be able to do the same for diagonal matrices.  But maybe it
is not as useful as I was originally thinking.

jwe