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Mar
28
reviewed Close Integrated Solution Graphics
Mar
28
comment 4th-order Runge-Kutta method to solve a system of coupled ODEs
Just copy and paste (Ctrl+C and Ctrl+V under Windows), as you copy and paste any thing. BTW, if you add a white space before "@" and "xzczd", the reminder won't work. It should be "@xzczd".
Mar
28
comment 4th-order Runge-Kutta method to solve a system of coupled ODEs
Select your code and press Ctrl+Shift+I before copying. And you can also use this to convert your code to make it look better.
Mar
26
revised How to modify a PDE inside NDSolve according to an if condition
deleted 10 characters in body
Mar
26
answered How to modify a PDE inside NDSolve according to an if condition
Mar
26
comment How to modify a PDE inside NDSolve according to an if condition
Well, I still suggest you to add the missing b.c.s, though NDSolve gives an answer currently, it's not that clear what boundary is added.
Mar
26
comment Delete duplicates by a criterion
And your syntax for DeleteDuplicates is even incorrect.
Mar
26
comment How to modify a PDE inside NDSolve according to an if condition
Is the function f[t, y, x] or f[t, x] or f[y, x]? And you still miss 2 boundary conditions. (A rule of thumb for the necessary number of i.c. or b.c. is that it should be usually equal to the highest order of the corresponding derivative.)
Mar
26
comment Complete definition of special functions in Mathematica
I prefer pressing F1.
Mar
25
awarded  Popular Question
Mar
23
comment How to accelerate my code?
@Purboo "I think I need to learn Compile first." - Before that, I suggest you to read the last paragraph of this answer. "Sometimes it is not easy to write code using functions like Apply, Map and Thread. " - Yeah, sometimes, but quite rare in my opinion, in most cases, it's just because you're not familiar enough with the coding style of Mathematica.
Mar
22
comment Coupled non-linear differential equations
@Ricoleto As mentioned above, it's just a result of trial and error. Sadly it seems not to be able to handle Tmax=10, and I haven't think out a corresponding solution yet. I think it might help if you add some background information about your equations to your question. BTW, I just noticed that the b.c. in your code is different from what you claimed in the text i.e. $m(0,t)=m(\pi L,t)=v(0,t)=v(\pi L,t)$, is it intended?
Mar
21
reviewed Approve Square both sides of an equation?
Mar
21
revised How to propel the integration of time a little bit further? Numerical solution can not evolve to the max time
added 134 characters in body
Mar
21
revised How to propel the integration of time a little bit further? Numerical solution can not evolve to the max time
added 134 characters in body
Mar
21
answered How to propel the integration of time a little bit further? Numerical solution can not evolve to the max time
Mar
21
revised Coupled non-linear differential equations
deleted 2 characters in body
Mar
21
comment Coupled non-linear differential equations
Seems that this hasn't been done yet: Hello, welcome to Mathematica.SE! I suggest the following: 1) As you receive help, try to give it too, by answering questions in your area of expertise. 2) Read the faq! 3) When you see good questions and answers, vote them up by clicking the gray triangles, because the credibility of the system is based on the reputation gained by users sharing their knowledge. Also, please remember to accept the answer, if any, that solves your problem, by clicking the checkmark sign!
Mar
21
comment I have several functions and how I know which one is the maximum in a certain range?
Please post your code instead of the picture so we can test it easily.
Mar
21
revised Coupled non-linear differential equations
a new observation added.