On Tue, Nov 4, 2008 at 3:06 PM, kex <[EMAIL PROTECTED]> wrote:
>
> Hi!
>
> J is an equation with variables defined in ## my variables
>
> What I want to do is plot the J versus x
> x is a list of values lets say from -100 to 40
>
> so how do I change from x=1 to x=[-100,..,40]
> and fix this error:
>
> "TypeError: cannot coerce type '<type 'list'>' into a
> SymbolicExpression."
>
> I used list_plot(X,Y) if X and Y are both lists like X=[2,..,2] and
> Y=[-2,..,5] and it worked
> also no problems with plot(X,Y) if X and Y are both symbolic and not
> lists
>
> but I am lost when one variable is a list of values and other
> variables are fixed values
I usually use the line command for this, e.g.,
sage: J(x) = 2*sqrt(abs(x))
sage: line([(i, J(i)) for i in [-5,..,5]])
>
>
> ## My variables
> var=('G','GAMA', 'BETA', 'THETA', 'MI', 'N',x,'Gs','Gz','Jz','Js')
>
> #Values
> BETA=1
> THETA=9.2
> N=3
> MI=5
> x=[-100,..,40]
> GAMA=1
>
> ## eq for G
> Gz=(GAMA * (exp(x) + BETA * sqrt(THETA) * exp(x/THETA)))
> Gs=(sqrt(2* 3.14 * ((N**2 * MI) - (2 * x))))
> G=(Gz/Gs)
>
> ## eq for J
> Jz=(G * sqrt(N**2 - 2*x/MI))
> Js=(1 + BETA + G)
> J=(Jz/Js)
>
> show(Gz)
> show(Gs)
> show(G)
> show(Jz)
> show(Js)
> show(J)
>
> plot(J,x) ## I get an error
> ist_plot(J,x) ## I get an error
>
>
> I need help, advice or directions :)
>
>
> Thank you for your good work
> I like learning Sage
>
>
> Boris
>
> student
> total beginner (no experience in Mathematica or other programs...Sage
> is the first)
> Sage 3.1.4 using notebook
> GNU/Linux
> Ubuntu 8.1
> KDE4.1
>
>
>
> >
>
--
William Stein
Associate Professor of Mathematics
University of Washington
http://wstein.org
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