matintersect (pari-2.13.0) | : | matintersect (pari-2.13.1) | ||
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Function: matintersect | Function: matintersect | |||

Section: linear_algebra | Section: linear_algebra | |||

C-Name: intersect | C-Name: intersect | |||

Prototype: GG | Prototype: GG | |||

Help: matintersect(x,y): intersection of the vector spaces whose bases are | Help: matintersect(x,y): intersection of the vector spaces whose bases are | |||

the columns of x and y. | the columns of x and y. | |||

Doc: $x$ and $y$ being two matrices with the same | Doc: $x$ and $y$ being two matrices with the same | |||

number of rows each of whose columns are independent, finds a basis of the | number of rows each of whose columns are independent, finds a basis of the | |||

$\Q$-vector space equal to the intersection of the spaces spanned by the | vector space equal to the intersection of the spaces spanned by the | |||

columns of $x$ and $y$ respectively. The faster function | columns of $x$ and $y$ respectively. The faster function | |||

\tet{idealintersect} can be used to intersect fractional ideals (projective | \tet{idealintersect} can be used to intersect fractional ideals (projective | |||

$\Z_K$ modules of rank $1$); the slower but much more general function | $\Z_K$ modules of rank $1$); the slower but more general function | |||

\tet{nfhnf} can be used to intersect general $\Z_K$-modules. | \tet{nfhnf} can be used to intersect general $\Z_K$-modules. | |||

End of changes. 2 change blocks. | ||||

2 lines changed or deleted | | 2 lines changed or added |