Re: Odd behavior of time-domain convolutions

[John W. Eaton]

On  5-Sep-2007, Quentin Spencer wrote:

| John W. Eaton wrote:
| > On  5-Sep-2007, Quentin Spencer wrote:
| >
| > | I've used the wrapper 
| > | approach before where the only difference was the interface code, and 
| > | even then the mex code was a little faster, but not by the large margins 
| > | you are observing.
| >
| > I'm surprised by that becuase I think more work has to be done to set
| > up and recover from calling a function with the MEX interface.  Also,
| > in some cases copies of the data passed to and from a MEX file are
| > required when no copy is needed with the .oct file interface.
| 
| It may be that my problem was what David pointed out--using the indexing 
| functions that bring in a lot of extra overhead.

You say that the only difference is the inteface code.  Did the
interface code perform indexing on Array/Matrix values?

jwe