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15h
comment nonlinear differential equation
Can you show the output? It produces a straight zero line for me.
1d
comment How can I plot the complex formula as follow?
@Erergo it's not good for someone to retype that kind of equation. Copy a text. Also, from what I've see, you have a miniscule i, and in Mathematica imaginary unit is a capital I.
1d
comment How can I plot the complex formula as follow?
possible duplicate of Plotting Complex Quantity Functions
1d
comment How can I plot the complex formula as follow?
Is it supposed that people willing to help will rewrite the formula from an image?
May
6
comment simple dynamical system with disturbance
@Sam I have extended with plots of displacement for over-, under- and critical dumping.
Apr
29
comment accessing solution of pde
You could use this: u[x, t] /. sol /. {x -> 0, t -> 10}.
Apr
25
comment How to invert the default order of polynomial?
So, can you share more about the use case.
Apr
25
comment How to invert the default order of polynomial?
You could use TraditionalForm for this.
Apr
22
comment Something like MATLAB Cody for Mathematica? (Learning through exercises.)
@Phab Actually, it's like ProjectEuler, but only Mathematica allowed and checked.
Apr
21
comment Integrate using \[Esc] int \[Esc]
You should use \[Ctrl] + % for upper bound, it works for me (M10.1, Windows 8.1). \[Ctrl] + ^ is a superscript, it's an index.
Apr
18
comment Solve doesn't solve my transcendental equation
Can you add them too? Maybe it will be useful.
Apr
18
comment Solve doesn't solve my transcendental equation
I fear not, only some approximate solution, or a numeric one.
Apr
18
comment Solve doesn't solve my transcendental equation
Mathematica is unable to solve transcendental equation. Specially, when you have d in various combinations of transcendental functions.
Apr
18
comment Analogue for Maple's dchange - change of variables in differential expressions
For a quiet long time of using Mathematica the Replace and ReplaceAll are more than enough and, actually, I found them much powerful than Maple's dchange.
Apr
18
comment Analogue for Maple's dchange - change of variables in differential expressions
possible duplicate of Change variables in differential expressions
Apr
18
comment Failing to solve a simple PDE with NDSolve
@yep And does the solution looks like the intended?
Apr
17
comment Failing to solve a simple PDE with NDSolve
@yep This works for me: gist.
Apr
17
comment Failing to solve a simple PDE with NDSolve
I have replaced the conditions with DirichletCondition and it solves the equation.
Apr
17
comment Boundary condition not correctly imposed for NDSolve
Oh, haha. Anyway, this links are kind of useful addition to an answer.
Apr
17
comment Boundary condition not correctly imposed for NDSolve
By default, no. NDSolve quiet dumb here, it's only solves the equation with given accuracy and precision. For additional analysis there is at least "StiffnessSwitching" Method for NDSolve. And Stiffness Detection.