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Mar
31
comment numerical integration with parameter
other than syntax, you can't do numerical integration with symbolic limit
Mar
31
comment Laplace PDE in a polar coordinate system
This PDF shows what to do at $r=0$ to avoid blow up, which is to set one of the constant of integrations to zero. May be you can follow this derivation and apply your numerical solution to the resulting solution.
Mar
31
comment How do I get the bounds of my Slider to correspond to the current length of a string entered in another control?
@raxacoricofallapatorius the solution uses the second argument of dynamic. I do not know how else to solve it, but there might be a way to do it without using the second argument of dynamics. I do not know.
Mar
31
comment How do I get the bounds of my Slider to correspond to the current length of a string entered in another control?
@raxacoricofallapatorius I use LICEcap to record it from the screen as animated gif file. I hope someone can understand better the solution you need and provide better implementation. good luck.
Mar
31
comment Convert a list of hexadecimal numbers to decimal
To automate this little more, may be FromDigits[#, 16] & /@ (ToString[#] & /@ u)
Mar
30
comment FindDivisions behavior changed?
something is wrong here. docs shows your call should work as written. Last entry in help. !Mathematica graphics btw, I get same error in V 9 as in V 10.02
Mar
30
comment Using Solve to obtain a constant so that f(x) is continuous at x=2
@user27386 Changed the plot command above to change the limit of the plot. Like this Plot[myfunc[x] /. c -> sol, {x, 0, 4}] or Plot[myfunc[x] /. c -> sol, {x, 1.9, 2.1}] etc... but if you want to zoom in and out, it is very easy to make a manipulate and use a slider to change the zoom level.
Mar
30
comment Error message for FEMStiffnessElements
may be it does not like the complex part. (all those I's in there). Is this quantum mechanics problem? No beep sound is generated when the "I's" are removed.
Mar
29
comment Creating a matrix under conditions
@asad I think it is ok now.
Mar
28
comment How can I simplify a triple integral with exponentials?
@smtux There was no need to use simplify? You could always do simplify at the end if you want, but in this case, the result do not change form and remain the same size.
Mar
28
comment How can I simplify a triple integral with exponentials?
@smtux Why do you have to change your code to handle these assumptions? Just use the code I posted. Does it have to be all in one line? To make it easier, I updated the answer and pasted all the code in one cell. So just use this cell instead of yours, that is all.
Mar
28
comment 4th-order Runge-Kutta method to solve a system of coupled ODEs
This post has code for Runge-Kutta solving-a-system-of-odes-with-the-runge-kutta-method
Mar
28
comment 4th-order Runge-Kutta method to solve a system of coupled ODEs
Can you show the equations themselves you are trying to solve with the initial/boundary conditions? If you do not know latex, you can scan them from the book and paste the image.
Mar
28
comment How can I simplify a triple integral with exponentials?
@smtux breaking the multiple integration to sequences of integration just help show where Mathematica needs help. The above just breaks the process to see what was needed (what assumptions). Sometimes if a definite integral hangs, finding the indefinite integral then using limits with assumptions helps as in this case.
Mar
27
comment How can I simplify a triple integral with exponentials?
That can't be what you typed. You have syntax error. No closing ")" error.
Mar
27
comment Is there a way to create a two column page layout in a notebook?
Use Mathematica for computation and graphics, which is what it is best at, and use Latex for typesetting which is what it is best at.
Mar
25
comment Solving differential equations with Wolfram Mathematica
There is an extra i comparing to the textbook it is normal to rename the whole thing to a constant. i.e. $(c_1-c_2)i$ is renamed to new constant, say $C[1]$. So the $i$ goes with the constant and is not left out. This is standard way of reformulating solutions to ode's so the solution is written in terms of trig functions.
Mar
25
comment Solving differential equations with Wolfram Mathematica
Just because two mathematical expressions appear different, this does not mean they do not represent the same thing.
Mar
24
comment Clicking phase plane with mouse
@David this is strange. On my system (windows 7, V 10.02) I do not see any blinking.
Mar
24
comment Clicking phase plane with mouse
@David I do not see any blinking cell problem? If you mean the cell side become black when you click on the Manipulate, then that is expected ofcourse as Manipulate is updating (busy). If you mean when you readjust the notebook size, then added PlotTheme->None fixes this. I updated.