Re: [sage-support] Dependence set of a symbolic expression
Thankx a lot.
On 2 December 2011 02:18, Laurent wrote:
>> sage: x0,x1,x2,x3,x4,x5,x6,x7,x8,x9 = var('x0,x1,x2,x3,x4,x5,x6,x7,x8,x9')
>> sage: S = 1*x1 + 2*x3 + 3*x4 + 4*x5 + 5*x7 + 6*x9
>> sage: S.variables()
>> (x1, x3, x4, x5, x7, x9)
>
>
> By the way :
>
> sage: x=var('x')
> sage: S=sin(x)**2+cos(x)**2
> sage: S.variables()
> (x,)
> sage: S.simplify_trig().variables()
> ()
>
> thus one has to be somewhat careful.
>
> Laurent
>
>
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Re: [sage-support] Dependence set of a symbolic expression
sage: x0,x1,x2,x3,x4,x5,x6,x7,x8,x9 = var('x0,x1,x2,x3,x4,x5,x6,x7,x8,x9')
sage: S = 1*x1 + 2*x3 + 3*x4 + 4*x5 + 5*x7 + 6*x9
sage: S.variables()
(x1, x3, x4, x5, x7, x9)
By the way :
sage: x=var('x')
sage: S=sin(x)**2+cos(x)**2
sage: S.variables()
(x,)
sage: S.simplify_trig().variables()
()
thus one has to be somewhat careful.
Laurent
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Re: [sage-support] Dependence set of a symbolic expression
On 12/01/2011 10:46 AM, Santanu Sarkar wrote:
> Hello,
> Let S be a symbolic expression of a certain number of variables taken
> from a particular set of variables. How do I find out the list of the
> distinct variables that S depends on?
> Suppose {x0,x1,x2,x3,x4,x5,x6,x7,x8,x9} is a set of unknowns and S =
> x1 + x3*x4 + x5*x7*x9. I need to find the subset {x1,x3,x4,x5,x7,x9}
> on which S depends. How to do this in sage?
>
sage: x0,x1,x2,x3,x4,x5,x6,x7,x8,x9 = var('x0,x1,x2,x3,x4,x5,x6,x7,x8,x9')
sage: S = 1*x1 + 2*x3 + 3*x4 + 4*x5 + 5*x7 + 6*x9
sage: S.variables()
(x1, x3, x4, x5, x7, x9)
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[sage-support] Dependence set of a symbolic expression
Hello,
Let S be a symbolic expression of a certain number of variables taken
from a particular set of variables. How do I find out the list of the
distinct variables that S depends on?
Suppose {x0,x1,x2,x3,x4,x5,x6,x7,x8,x9} is a set of unknowns and S =
x1 + x3*x4 + x5*x7*x9. I need to find the subset {x1,x3,x4,x5,x7,x9}
on which S depends. How to do this in sage?
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