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Apr
20
suggested approved edit on Plotting 2nd order ODE solution for specific values of constants
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
revised Change numerical plot labels on one axis to strings
improved code formatting
Apr
18
suggested approved edit on Change numerical plot labels on one axis to strings
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
revised Boundary condition not correctly imposed for NDSolve
added 318 characters in body
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.
Apr
17
answered Boundary condition not correctly imposed for NDSolve
Apr
17
comment Boundary condition not correctly imposed for NDSolve
First, you have very unstable equation, try various initial values, like 10^-6, 10^-3 and other in the 1/10^6 point. Also, this equation perfectly analytically solvable.
Apr
17
comment Using Runge-Kutta method to find arc length
@user27670 Plot3D needs two parameters for plotting, not only t. Does the Plot[tfn[t], {t, 0, 2*Pi}] is what you need?
Apr
16
revised About the wrong evaluation of an integral
improved formatting
Apr
16
suggested approved edit on About the wrong evaluation of an integral
Apr
14
comment Unable to Solve (for arclength parametrization)
Are you plan to solve for an undefined r?