Feature #1436: Flatten for a matrix - CoCoALib - CoCoA Project

Feature #1436

Flatten for a matrix

Added by John Abbott about 4 years ago. Updated over 3 years ago.

Status:

Closed

Priority:

Low

Assignee:

John Abbott

Category:

New Function

Target version:

CoCoALib-0.99800

Start date:

04 Mar 2020

Due date:

% Done:

100%

Estimated time:

1.41 h

Spent time:

1.40 h

Description

I happened to see in SparsePolyOps-MinPoly.C that there is a function for "flattening" a matrix.

Do we want to make official functions for flattening?
Suggested names: FlattenMatByRows and FlattenMatByCols
Return type: vector<RingElem>

Note that we already have MatByRows and MatByCols which are the opposite functions.

History

#1 Updated by John Abbott over 3 years ago

Priority changed from Normal to Low
Target version changed from CoCoALib-0.99800 to CoCoALib-0.99850

Some notes:

(A) there are already the functions GetRows and GetCols which return a vector<vector<RingElem>>
(B) the current fn is MatrixFlatten around lines 116-125 in SparsePolyOps-MinPoly.C

In its current "private" form MatrixFlatten is a "nasty" impl: it requires that the vector into which the result is copied be of the right size.
We could either use resize inside the function, or else write a function which creates a new vector and returns that (returning should not copy the vector).

I think this is not urgent, so am postponing to 0.99750.