If one does
sage: Ii.subs(pars).variables()
(x,)
so that is fine. However,
sage: RR(Ii.subs(pars)(x=-10))
Traceback (most recent call last):
...
TypeError
which tells you what the error is (not very helpful in this case). On
a hunch
sage: CC(Ii.subs(pars)(x=-10))
2.59329101030962e-14*I
so
Thank you very much Stan, this was helpfull
I have more questions,
I get this message:
verbose 0 (3605: plot.py, _plot) WARNING: When plotting, failed to
evaluate function at 200 points.
verbose 0 (3605: plot.py, _plot) Last error message: ''
Why does it fail to evaluate ?
my datasheet:
#Defi
Hi Boris,
Here is what I do:
# Define the variables:
var('GAMA BETA THETA')
# Create a dictionary with the parameter values for plotting:
pars = dict(GAMA=1,BETA=1,THETA=10)
# Define the symbolic function
J1(x) = GAMA*x + BETA*x^2 + THETA
# Substitute the parameters into the equation and plot it
Thank you,
if I assign a value I lose symbolic expression ?
If I set GAMA=1 than gama in equation is not a letter/symbol of gama
but it is a number that was asigned to gama?
I though that I can keep the expression in symbolic notation and still
plot/calculate the equation.
So this means that the
Dear Boris,
On Nov 10, 9:56 pm, kex <[EMAIL PROTECTED]> wrote:
> GAMA==1
> BETA==1
> THETA==10
> N==1000
> MI==1
> JR==0
> PI==3
> PSI==x
Are these supposed to be assignments?
If "yes", it should be
GAMA=1
BETA=1
THETA=10
etc.
When you do
GAMA==1
where GAMA is a variable, you just create a for
var('G')
GAMA=var('gamma')
BETA=var('beta')
PSI=var('psi_c')
THETA=var('theta')
N=var('N')
MI=var('mu')
J1(x)=var('J_e1')
JR=var('J_R')
PI=var('pi')
GAMA==1
BETA==1
THETA==10
N==1000
MI==1
JR==0
PI==3
PSI==x
G = GAMA * (exp(PSI) + BETA*sqrt(THETA)*exp(PSI/THETA)) /
sqrt(2*PI*(N^2 * MI - 2*PSI))
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 er
