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...
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.
another problem is that when i do a heavy computation and obtain results , after closing mathematica...
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 :
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
suppose we have this equation :
x is a n by 1 column matrix and A is a n by n matrix that is the matrix of coefficients.
coefficients of equations and consequently A are depend on t which is time.
how i Solve this equation ?
i want to solve this equation
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...
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...
what is Spin Hall effect and quantum hall effect?
i can not find a good description on wikipedia.com do you have a good link or description?
and another question: why in franck hertz experiment we use MERCURY instead of hydrogen?
in Ballmer experiment we have a lamp of hydrogen gas and we put on it a high voltage in order to excite the electron . then we see 3 line of light. this 3 line of light are resulted from falling electron from layer with n=3 , 4 ,5 to layer with n=2.
in Ballmer expriment which we see...