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symbolic vector norm

asked 2012-03-19 10:25:19 -0600

calc314 gravatar image

I can't get Sage to produce the norm or even just compute w[1]^2 in the code below. I keep getting a "not implemented" error. Have I made a simple mistake here, or is there a way around this? Thanks for the help. I haven't done much with matrix computations in Sage yet and am trying to learn my way around.

var('x,y')
a=matrix([[1,2],[-3,0]])
v=vector([x,y])
w=a*v.column()
w.norm()
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This is an error in symbolic matrices (v.column() makes w a symbolic matrix, not a symbolic vector). I've opened a ticket here: http://trac.sagemath.org/experimental/ticket/12733

Jason Grout gravatar imageJason Grout ( 2012-03-22 21:53:46 -0600 )edit
mforets gravatar imagemforets ( 2017-04-11 04:50:37 -0600 )edit

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answered 2012-03-19 11:15:18 -0600

achrzesz gravatar image
sage: var('x,y')              
(x, y)
sage: a=matrix([[1,2],[-3,0]])
sage: v=vector([x,y])         
sage: w=a*v                   
sage: w.norm()                
sqrt(abs(x + 2*y)^2 + abs(-3*x)^2)
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Asked: 2012-03-19 10:25:19 -0600

Seen: 1,961 times

Last updated: Mar 19 '12