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Oct
1
comment Disable alert message with internet connectivity off
I have the same problem also. But it is a harmless beep that shows up only at start time, so it was easier to just ignore it than try to find how to turn it off :)
Oct
1
comment Using variable values from Manipulate in later Plots etc
Easy way around, is to use different symbol, since "t" is used as a free parameter inside Manipulate. From outside, refer to it as say "z", like this: Manipulate[ z = t /. First@NSolve[ Rationalize[Integrate[PDF[StudentTDistribution[0, 1, df], x], {x, -t, t}] == vertrauensintervall/100], t, Reals], {df, 3, 30, 1, Appearance -> "Labeled"}, {vertrauensintervall, 68.270, 99.73, 1, Appearance -> "Labeled"}, ContinuousAction -> False, LocalizeVariables -> False ] screen shot: !Mathematica graphics ps. need to @name to ping one so they hear you
Oct
1
comment ComplexExpand does not treat everything as real number
@belisarius I found a reference. Here it is reference.wolfram.com/language/guide/VariablesAndFunctions.html The symbolic language paradigm of the Wolfram Language takes the concept of variables and functions to a new level. I am sure there might be more exact definition somewhere, May be in the Wolfram Mathematica original book itself? I do not know.
Oct
1
comment ComplexExpand does not treat everything as real number
the help says expands expr assuming that all variables are real notice the word variables. I do not think D[f[X],x counts as a variable. Do you? (since it does not know what f[x] is defined as.
Oct
1
comment Using variable values from Manipulate in later Plots etc
That is because you did not make 't' variable. Try adding t /. First@NSolve[....] to your code
Oct
1
comment Using variable values from Manipulate in later Plots etc
...but to answer your question: If you add LocalizeVariables -> False then all Manipulate control variables can be used outside Manipulate. i.e. they are no longer localized. Not a good way to do things if you ask me, but if that is what you want, this is an option.
Oct
1
comment Why PlotStyle->Dashed make everything dashed?
No problem on windows using 10.01, screen shot !Mathematica graphics
Oct
1
comment Using variable values from Manipulate in later Plots etc
Why are you even using Manipulate for this? A simple Table command can be used to generate the data. data = Table[ {t /. First@NSolve[ Rationalize[Integrate[PDF[StudentTDistribution[0, 1, df], x], {x, -t, t}] == vertrauensintervall/100], t, Reals], df}, {df, 3, 5, 1}, {vertrauensintervall, 68, 74, 1} ] It does not make sense to use Manipulate sliders to generate the data, since you can move the sliders in non-uniform ways, unless you want to plot one point at a time.
Sep
28
comment Rotation of a graph using manipulate
You should correct your question itself. If you think there is no more issue and you found your own mistake, then you can delete the question.
Sep
27
comment Solving vector equations
Maybe x = {x1, x2}; a = {8, -2}; b = {3, 3}; Solve[x + a == b, x] gives {{x1 -> -5, x2 -> 5}}
Sep
27
comment Convert imported PDF to an image
@DJS I am not following what you mean. images types such as png, jpeg, gif, etc... are file-based image formats, and not in-memory based image formats. Once read, they are converted to Mathematica Graphics. For example, to covert png to gif, you'd import the png file to Mathematica, then export it back as gif. Or may be I am not understanding what you mean by the question.
Sep
25
comment Real time visualization of parametric plots
try f = {Cos[s/Sqrt[2]], -Sin[s/Sqrt[2]], s/Sqrt[2]}; Manipulate[ ParametricPlot3D[f, {s, -z, z}, PlotRange -> {{-1, 1}, {-1, 1}, {-2, 2}}], {{z, .1, "extent"}, .1, 2 Pi, .1, Appearance -> "Labeled"} ] and click on the play arrow in the control for "extent" to see the animation
Sep
25
comment Manipulating parameters in a complex algorithm
I just copied your code and it ran as is. Here is screen shot. !Mathematica graphics maybe this function was not used when I run it. do not know.
Sep
25
comment How can I load << MathWorld`Curves`?
I have all the packages, but they are not updated to new version of M. For example, this one does not run on V10.1 since it uses BeginPackage["MathWorldCurves",{"UtilitiesFilterOptions"}] and "Utilities`FilterOptions" is no longer supported, see reference.wolfram.com/language/Compatibility/tutorial/Utilities/… so even if get these files, someone needs to update them to run in new M. May be contact the original author and see if there is newer version. The Mathworld packages I have are called version 6. I think that was the zip file name. Do not remember now.
Sep
25
comment Plotting (Graphing) a Quadratic Function with Vertex and Roots
I added small description below
Sep
25
comment Plotting (Graphing) a Quadratic Function with Vertex and Roots
Is this what you want: r1 = 15/10 + I Sqrt[7]/2; p = Expand[(x - r1)*(x - Conjugate[r1])] Plot[p, {x, -3, 3}] which gives on V 10.01 !Mathematica graphics the poly is 4-3 x+x^2
Sep
25
comment Manipulating parameters in a complex algorithm
it looks good. Tried it, was little slow when N was 500 and higher. May be this is algorithm tune-up. But if it works for you and no more issues, then you can answer your own question with your answer above. Unless you have any specific questions.
Sep
24
comment Error using Nsolve with system of two equations: “Use Reduce”
@DanielLichtblau thanks! I actually did not notice that NSolve accepts ranges, now it works much better. Updated answer.
Sep
24
comment Error using Nsolve with system of two equations: “Use Reduce”
I tried using Ersek RootSearch, which is supposed to be able to find roots in given range, but on V 10.01 something changed. Now I get No more memory available. Mathematica kernel has shut down. Try quitting other applications and then retry. This package looks like it is no longer maintained. library.wolfram.com/infocenter/MathSource/4482 It worked ok on version 9.01
Sep
24
comment Numerical Error with Matrix operations
try Chop[ret]