how to use variables in a matrix ?

Kamel
11 ●1 ●2 ●4

Hello,

this code below doesn't do what I expect.

var('x'); M(x) = matrix(2, 2, [x,x,x,x]); M(3)

Can someone tell me what to do please ?

Well, you should perhaps tell what you would expect... Let me suggest two possibilities:

use a Python function:

sage: M = lambda x : matrix(2, 2, [x,x,x,x])
sage: M(3)
[3 3]
[3 3]

if you want to consider your matrix as a symbolic object:

sage: var('x'); M = matrix(2, 2, [x,x,x,x])
x
sage: M
[x x]
[x x]
sage: M.substitute(x=3)
[3 3]
[3 3]

Comments

ok, thanks.

Kamel ( 2017-11-07 18:37:45 +0200 )edit

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