Project

General

Profile

Design #1465

mul(MAT,MAT,MAT)

Added by John Abbott almost 4 years ago. Updated 2 months ago.

Status:
In Progress
Priority:
Normal
Assignee:
-
Category:
Tidying
Target version:
CoCoALib-0.99880
Start date:
20 Jun 2020
Due date:
% Done:

10%

Estimated time:
Spent time:
0.45 h

Description

There is a fn mul(MAT,MAT,MAT)
Is it any use?

The impl is exception-safe, so internally it creates a new mat, and then swaps it into the first OUT arg. So it does not appear to be "efficient".

History

#1 Updated by John Abbott almost 4 years ago

  • Status changed from New to In Progress
  • % Done changed from 0 to 10

I have commented out the fn, and modified power(MAT,n).
Everything compiles and runs fine.

I suggest eliminating mul(M,M,M) Also C++14's "move" ability should also make it obsolete.

What do you think?

#2 Updated by John Abbott over 3 years ago

  • Target version changed from CoCoALib-0.99800 to CoCoALib-0.99850

Perhaps it could make sense to have a version of mul(mat,mat,mat) which is deliberately not exception safe (but also avoids reallocating memory).
We would need to make a test to whether this idea is actually useful...

NOTE: the use of mul inside power is such that power remains exception-safe even if mul is not!

#3 Updated by John Abbott 2 months ago

  • Target version changed from CoCoALib-0.99850 to CoCoALib-0.99880

Also available in: Atom PDF