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Nov
26
answered Output of NIntegrate depends on MaxRecursion
Nov
26
answered How to obtain the best possible NonlinearFit
Nov
26
comment Numerically Simulating a Simple Differential Equation: RC Circuit
why do you need a step function for? Since solution to ODE, which is the current is zero before $t_0$ for any $t_0$ any way. You could always shift the solution to right afterwords if you want. But may be I am missing something about your description.
Nov
25
comment How to make Graphics3D with multiple lighting sources being rendered faster
You must be talking about openGL viewer by Jens-Peer Kuska, who was a Mathematica expert (sadly passed away when only 45 years old). I remember using it also. I do not know if it would have helped or not, may be. If you want to do heavy duty 3D simulation, I do not think M is the right tool. Too bad, since its 3D API is really nice and well designed and easy to use to build 3D objects with, but if it is slow to render, none of this matters at the end. Here is the openGL viewer manual
Nov
25
comment How to make Graphics3D with multiple lighting sources being rendered faster
rendering speed of 3D in M is known to be slow, I complained about this for long time. The more data you have the slower it gets. Here is a post How to improve performance of Graphics3D rendering with Dynamics Notice no reply and nothing on this post. No body seems to care about this. Sometimes you can speed things up by removing some 3D stuff, like opacity will slow things, etc... but the whole problem is that M renders 3D slow. That is why I stopped using Manipulate for 3D physics simulation. Too slow.
Nov
25
answered How can I import and split lines with ASCII separator?
Nov
25
comment How to turn an expression into a number
try again posting the code as it is not readable now. select the cell, convert to inputForm, then copy it as text and paste. You seem be to missing some "\" on symbols used.
Nov
25
answered Why `Delete` does not work?
Nov
24
answered Integrate full derivative
Nov
24
comment Plotting ODE solutions with two parameters
use Manipulate, make sliders for the parameters, and do DSolve inside Manipulate and plot the solution(s).
Nov
24
comment Injecting list of controls into manipulate
@RolfMertig no problem. what I meant by not possible, is the way the OP was doing it. May be be V11 the Wolfram language will add support for this (i.e being able to make function calls to build the controls themselves) But I am still looking for an easy to use debugger build right into the notebook itself and for line numbers! Maybe will have to wait for V20 for these :)
Nov
24
comment Injecting list of controls into manipulate
@RolfMertig using With a lot is possible but that is what I said? The link I pointed to shows the With macro method shown by Leonid in the answer there. This With method helps, but it is still not easy to manage. Having the ability to call a function to build a control would be the ideal solution, but it is not possible.
Nov
24
comment Injecting list of controls into manipulate
The closest you can get is this: How to define part of a Manipulate control variable definition to reduce code duplication
Nov
24
comment Injecting list of controls into manipulate
You can't do this. Mathematica parses Manipulate expression for correct syntax/form, but it does not evaluate until it gets to Initialization. This is one big problem I always had with it, since all control code have to be written in-place with lots of duplicate boiler plate code, since one can't make functions to call that will build the controls on the fly. Basically, you have to write the controls code directly, so it parses correctly.
Nov
23
comment Why is my output equal to my input?
fyi, Maple 18 gives this answer, I'll leave you to decide how useful this result is !Mathematica graphics
Nov
23
comment Can anyone help me to get the solution of this first order ODE?
You can always try DSolve since it can actually solve it analytically . screen shot !Mathematica graphics eq = y'[x] == -Sqrt[y[x]^3]; ic = y[0] == -2; sol = y[x] /. First@DSolve[{eq, ic}, y[x], x]; Plot[Re[sol], {x, 0, 1}]
Nov
23
comment Can anyone help me to get the solution of this first order ODE?
it seems a typo in the pdf. The ODE is there few lines above it. it is NDSolve[{y'[x]^2-y[x]^3==0,y[0]^2==4},y,{x,1}]
Nov
23
comment Mathematica List Selection
@SquareOne you are smarter than me and seemed to have figured what OP wants. Can you write it in terms of symbols using p1,p2,p3,p4 that he showed? Does OP wants abs[p1-p2]>600 ? I do not understand how the solution shown came about, and I am drinking lots of coffee now and still do not get it.
Nov
23
comment Mathematica List Selection
I do not understand how you came up with the answer. So, why not this one {{206.314, 4135.81}, {95.84, 0.}} for example? Maybe you can explain using point1,point2,point3,point4 it will be better. Are you looking for Abs[point2-point1]>600 for example?
Nov
22
comment DateListLogLogPlot
The above must have been what happened as there is no other way to explain it. May be symbols in other than System` context can be show in one color and everything else in another color! Or, add a small horizontal line between System names (shown first) then all symbols in other contexts below the line next. I think mixing System symbols with user defined symbols is not a good idea in the the command completion popup menu as it is the case now.