lessen
Returns a matrix with its rightmost column removed.
Syntax
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lessen(A)-
Ais a matrix
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Description
If A is a matrix with at least two columns, then lessen(A) returns the matrix obtained from A by removing the rightmost column from it.
(If an lvalue, A is not altered.)
Examples
A ≔ ❨❨2, 2, −5, 0, −1❩, ❨1, 5, −2, 1, 5❩, ❨0, 1, 3, 2, 6❩, ❨−2, 1, 4, 6, 9❩, ❨3, −2, 7, −2, 6❩❩
⎛ 2 2 −5 0 −1⎞ ⎜ 1 5 −2 1 5⎟ ⎜ 0 1 3 2 6⎟ ⎜−2 1 4 6 9⎟ ⎝ 3 −2 7 −2 6⎠
B ≔ lessen(A)
⎛ 2 2 −5 0⎞ ⎜ 1 5 −2 1⎟ ⎜ 0 1 3 2⎟ ⎜−2 1 4 6⎟ ⎝ 3 −2 7 −2⎠
rank(A) = rank(B)
true