next | previous | forward | backward | up | top | index | toc | Macaulay2 web site

columnAdd -- add a multiple of one column to another

Synopsis

Usage:
columnAdd(m,i,a,j)
Inputs:
- m, a mutable matrix
- i, an integer
- a, a ring element, in the same ring as m
- j, an integer
Consequences:
- The i th column of m is modified by adding a times the j th column of m

Description

i1 : R = ZZ[a..f];

i2 : m = mutableMatrix genericMatrix(R,a,2,3)

o2 = | a c e |
     | b d f |

o2 : MutableMatrix

i3 : columnAdd(m,0,c,1)

o3 = | c2+a c e |
     | cd+b d f |

o3 : MutableMatrix

i4 : m

o4 = | c2+a c e |
     | cd+b d f |

o4 : MutableMatrix

See also

Ways to use `columnAdd` :

columnAdd(MutableMatrix,ZZ,Number,ZZ)
columnAdd(MutableMatrix,ZZ,RingElement,ZZ)