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Questions tagged [mathematica-8]

For questions specific to version 8.x.x of Wolfram Mathematica, or not applicable to versions 7 or earlier. Dedicated Mathematica Stack Exchange site: https://mathematica.stackexchange.com/

199 questions
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Plotting multiple gridlines and give seperate labels in Mathematica

I am trying to make the following plot: Pars = {ep -> 0.5, f1p -> 0.3, f2p -> 0.1, dp -> 0.05, q -> 0.1, en -> 0.4, d -> 0.1, Q -> 0.1, f2n -> 0.3, f1n -> 0.4, a -> 0.05, N1 -> 0.5, N2 -> 0.5}; #Parameters PlotREq1 = Plot[R = S /. Pars,…
Rspacer
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Calculation issue for LaguerreL in Maple Leaf

I am trying to calculate LaguerreL(n, a x) in Maple but a problem is occurring. It works for decimals and nor fractions, I think. Meaning, it works for LaguerreL(m,n,0.5) and not for LaguerreL(m,n, 1/2). Should not it work for both? Does not…
Khyati Malhan
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Solving a nonlinear system of matrices using Mathematica

I am trying to find solutions to nonlinear systems of matrix equations with Mathematica. The solution space is too complicated to try to use Solve, and thus I have tried to use FindInstance. Here is this simplest example of a nonlinear system that I…
Hunter Vallejos
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ErrorListPlot shows only errorbars but not the data points.

I have been using the command ErrorListPlot in almost all of my mathematica scripts. However, recently I have seen that after execution of my mathematica script, the function ErrorListPlot shows red colored (while all executed functions are black…
PythonNoob
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Manipulate an image mathematica

I'm having trouble making an image move left to right in mathematica. I have the manipulate for a point, (*Rook Movement*) Manipulate[ Graphics[Translate[Point[{0, 0}], {t, t2}], Axes -> True, PlotRange -> {{0, 8}, {0, 8}}], {t, 0, 8}, {t2,…
NeilnGauss
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How to get a list of elements from the lower triangular matrix

I am new to Mathematica. I have a lower triangular matrix defined as follow A = Table[If[i > j, Subscript[a, i, j], 0], {i, s}, {j, s}]; I would like to the lower triangular elements in a list. For example, when s = 2, the list would contain…
kirikoumath
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How to know 4 nodes (in one line) have same directions (or not)

If I have 4 nodes on a line, for example: Main line is formed by nodes A(0,0) and B(5,0) and there is a line on this main line which is formed by C(2,0) and D(4,0) It is clear that vector AB has the same direction with vector CD, or in other…
bestrong
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Multiple Regression Analysis in SPSS

Currently we are working on a research paper in which we have conducted psychological experiment to get data-set. After that we have applied Multiple regression to find the relation among dependent variable and independent variables. our model was…
Khan
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Plotting a infinite potential well (double well)

I've been trying to plot a double well potential graph with a piecewise potential function that has 3 regions, my code however is not properly plotting what I am looking for. This is what I got so far: As you can see the plot start in the middle…
user665997
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Mathematica Maximization, Won't maximize a * 0.3

I'm Having a problem maximizing this function in mathematica: Maximize[a + 0.3 * b, 0 < b < 10, a] I just get the above back again as output when I run the code, Not helpfull However when I maximize the equivalent function: Maximize[a + (3/10) * b,…
James Peach
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Define a region in using MaxValue[] function in Mathematica

The following two gives completely different output from Mathematica. The online document does not seem to require a pair of curly braces. https://reference.wolfram.com/language/ref/MaxValue.html Tau = 10; Diff = 1/3; phi[tau_] := 0.5 Sin[Pi…
user2008151314
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How to draw a 2d projection (circle) of a 3D object (sphere) in Mathematica?

SphericalPlot3D[ Cos[[Theta]], {[Theta], 0, [Pi]}, {[Phi], 0, 2 [Pi]}] This gives me a sphere. But what should I do in order to get a projection of it along any of the plane, let say a-b plane? It should look like a circle. Any idea would be…
Tanmoy Chakraborty
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How to make a jump difussion graphic

I have to plot the next jump diffusion model using Mathematica or a similar tool: namely, a Geometric Brownian motion with compound Poisson jumps. I can use any program for it. Note: I have found the next similar code but it does not work when I…
Edin_91
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Calculating area of a function using Riemann's Sum

f[x_] := 2/(2x+2) Limit[ Sum[ deltaX = 1/n; xk = 0 + k * deltaX; f[xk]*deltaX, {k, 1, n} ], n-> \[Infinity] ] I have the following code however, It doesn't work. The error: $RecursionLimit::reclim:…
kjanko
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Solving a system of 36 equations and 24 variables in Mathematica

I want to solve the following system of equations, but when I use Solve or NRoots my machine seems does not response. Are there any ideas to help? Can you run the code on your machine and give me the result. Solve[{a122 * a223 + a123*a323 +…
Reema
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