Here is a complete code which works the same as original code,
independently:
L=2;
var('s','t','T')
DH=[2,0,0,2]
HS={(0,1):(-1/2)*(1-s), (0,2):(-1/2)*(1-s), (1,0):(-1/2)*(1-s),
(1,3):(-1/2)*(1-s), (2,1):(-1/2)*(1-s), (2,4):(-1/2)*(1-s),
(3,1):(-1/2)*(1-s), (3,2):(-1/2)*(1-s)};
HS1={(i,i): DH[i
I'm so sorry, it seems there are some typos I should edit:
... I need to solve a large system of first order ODE's:(i is imaginary
unit)
> i*y'[t]=A[t].y[t]
> to find* y[t] *(a vector of n functions of *t*), given *y[0] *and *A[t]*
> (a sparse matrix ...
>
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Dear Dr. William,
Thanks for your attention, but what you stated is not really my problem.
Since the code above is just a part of my whole code, the software also
does not reflects such 'NameError' to me. Moreover, as I stated, it even
works without any errors when A[t] equals zero. By using 'A_
Due to a system malfunction, I was not able to post my new question,
immediately. So after a day, I've already posted it, titled as "Why is this
Value Error raised?".
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#In The Name of God#
Hello to every one. I need to solve a large system of first order ODE's:(i
is imaginary unit)
i*y'[t]=A[t].y[t]
to find PSI[t](a vector of n functions of t), given PSI[0]and A[t] (a
sparse matrix with linear terms of t as non-zero elements).
As a begginer Sage user, I tried t
Thank you so much! I'm sorry I couldn't answer earlier. It worked as I
expected. Now as the last question on this discussion, do I need to use
'SymbolicSequence', when I want to numerically solve a large ODE system? I
tried to use instructions in "Solving ODE numerically by GSL" from the
Docume
Thank you Michael, I loaded the file and succeeded to make a list of
symbols. But now and after evaluating my expression in terms of its
elements, how should I assign them different values I want the expression
to be calculated for? (see a part of my code above, it may illustrate what
I mean)
Thanks for your answer. Though I have defined and now use such a function
you suggested, but I need to calculate this function later for thousands
of different inputs. This means a huge amount of computation that can be
avoided, by once deriving an expression in terms of x[i]'s and then just
r
Hello to every one,
I am a *primitive *sage user and I want to produce a function of n
variables (x[1],x[2],...,x[n]), in nested 'for' loops. I've searched in
sage's documentation, but I have still 2 problems:
1. How to define a list of variables, such that I can use its items, as
independent va
Thanks for *vdelecroix* for redirecting my post to this group, and for all
useful posts. It seems that my last sentence about Nestlists -to some
extent- misleads my friends. The main point I want to know is: what is a
simple way to create a large system of equations and initial conditions,
su
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