hi
i compile a c++ program and after compiling it gives me a txt file which contains about 50000 points.
how i can plot these points in mathematica?
thanks
i want to solve a large system of coupled differential equations but i get this error
NDSolve::nlnum:
i attach the notebook in zip format.
what is the problem?
thanks
hi
suppose i run Two notebook and in each of them i have matrix A and Constant B and a function C
in each notebook these things have the same name.
if in notebook 1 i assign B=10 then in notebook 2 B is 10 too , which is not my desire.
how can i define these constants and matrices and...
Bill Simpson thanks for your comments.
jackmell i do not know how to do that.
however i think i should define the results of computation in new variables.
for example if after a computation i obtain a matrix i define it for another variable.
hi
when i run a heavy computation on mathematica in the same time even if i want to calculate 2+2 , mathematica does not calculate it until calculating of heavy computation finishes.
why?
another problem is that when i do a heavy computation and obtain results , after closing mathematica...
hi
i want to sum over two indices i and j . the elemet that i must sum is (x^(i,j))-i
that is x has superscript i,j and subscript i.
but in mathematica it gives me error.
here is the notebook :
http://www.mediafire.com/?novtz7t0liu9u78 [Broken]
thanks (:
hi
i solve numerically two coupled equation and obtain two function x[t] and y[t].
how i plot x[t] versus y[t] so that horizontal axis to be x[t] and vertical axis to be y[t].
here is the notebook of mathematica
http://www.mediafire.com/?g4sa3zi630vi8nl [Broken]
thanks
hi
i want to solve this equation
a/x=Cosh[b/x]
i set a=1 and b=5
and use NSolve code but mathematica say it can not solve it. but with maple i get real and imaginary parts.
1-is there another method to solve this equation numerically?
2-can this equation be solve for arbitrary a and b...
hi i do not understand what you mean.
can you write an example for this two problem?
1-Numerically solving equation (d/dt)A=B . which A and B are n by n matrices with some initial condition for example A[0]=C.
after solving numerically i need to take partial trace and plot the resulting...
hi
suppose initial condition is d[0]=IdentityMatrix[4] and initial time =0 and final time 11.
and another question:
when i use
n = 4;
d[t_] = Array[Subscript[w, ##][t] &, {n, n}];
dd = Array[Subscript[w, ##] &, {n, n}];
soln = DSolve[LogicalExpand[d'[t] == p], Flatten@dd, t]
the...
thanks
it works.
is there any reference for this code?
Limit[Map[(#[t] /. (soln[[1]])) &, dd, {2}], t -> Infinity]
i want to understand the job of any part of it. like #[t] and /. and (soln[[1]]) and (soln[[1]]) and dd (which is the solution of equation) and {2} (why it is 2 not...
i manage to take limit .error was for lack of some assumptions on variables like positivity and ....
but i now have another question how i take limit from all 16 solution of the equation as a whole . without taking limit individually?
1-is there any method to take limit from all 16...
hi
i want to solve equation d/dt(A)=B which A and B are n by n matrices. the matrices variable is t which is time.
1-how i can solve this equation?
2-how i can obtain asymptotic solution for time=infinite?
i use some help of this topic but i get error in mathematica...