# All Questions

65 views

### Absolute VectorPlot scaling

I'm trying to visualize the vector components of a rotation matrix with absolute vector lengths. VectorScale help states that When using an explicit sfun, ...
38 views

### How to invert the default order of polynomial? [duplicate]

By default, Mathematica outputs polynomials starting with smallest degree. How can I invert this?
17 views

### Possible bug of Exporting as HTMLFragment at Linux

This is the result of Mathematica 10.0.2 of Linux Version. There are two style inside one tag, and this fragment cannot be Imported as XML by Mathematica. This is the result of Mathematica 10.1 of ...
24 views

### Truncating a List of Subsets of Ordered Pairs

I have a set of pairs: ...
24 views

### Definition of function for integration [on hold]

I have this function: g33[p_] = Integrate[1/(a - b) (a μ2[-p/b] + μ1'[-p/b] - 2 a g2'[(-a p)/b] - (a + b) g4'[-p]), {p, -l/b, 0}] And I want to call it with ...
60 views

### Returning value if a point is in a region?

I'm writing a function so that if the user clicks on a certain region, a value is returned. The function takes in a condition list like the one below and a point. ...
44 views

### How can I make a plot of integer lattice? [on hold]

I want to make a plot of complex plane with dots representing visible lattice points. I want the result represented somehow like this: ...
105 views

### Manipulating List?

I have a huge list with 1000 elements. Manually entering and calculating SUM of probabilities it would take a few hours. Example: list = {1, 2, 3, 3, 4, 3} ...
25 views

### ConnectedComponents problem of syntactic structure

In Mathematica 10, ConnectedComponent computes the list of vertices belonging to strongly connected components. In the following simple example with a graph with no edges, the result is as follows: ...
66 views

### Manipulate with plot and images

I have the following code: ...
29 views

### Package for symbolic computation of christoffel symbols and parallel transports in Riemannian geometry, given the metric

I've no knowledge in mathematica (but I do in matlab), but I'd really appreciate if someone could mention what is/are the best and easy to learn mathematica package(s) for symbolic and numerical ...
25 views

### PeriodogramArray or PowerSpectralDensity?

could anyone explain what is the difference between PowerSpectralDensity[data,omega] and PeriodogramArray[data]? When I plot them (starting from the same set of data of course) I get two different ...
52 views

### I made my own equation, how do I know if it already exists? [on hold]

I made my own equation after playing around with some numbers. So I started to look for the equation to be sure I made it first. I googled and searched for it almost everywhere but couldn't find it. ...
60 views

### Matrix iteration failing after second step

I am calculating 11x6 matrix using different logics as in below code. Problem is in Do loop in below code where I have two different criteria to update matrix "fd". I am expecting logic in IF which ...
106 views

### Plot a data of four dimension

I have a confusion recently about the visualization of data.the data you can get here.The construction of data is four dimension,like as {x,y,z,color},this is my current solution. ...
32 views

### More than one graphic in Graphics command [on hold]

another question regarding plotting. I'm sorry, but somehow it is superhard for me to use these. I have a Graphics plot and I want to add a Point to it. A circle is already working. But everything ...
70 views

### Arbitrary hollow cylinders in mathematica 9

I'm having trouble displaying a hollow cylinder in Mathematica 9. A hollow cylinder looks like this: I tried to use RevolutionPlot3D with a step function. It ...
46 views

### In WolframAlpha, how can I make a Scatter Plot without connecting points? [on hold]

How do I plot a list of points without connecting the dots in WolframAlpha? I tried, for example, ...
65 views

### NDSolve parametric plot

Here is my code. s = NDSolve[{f'''[x] + f[x]*f''[x] == 0, f[0] == A, f'[0] == 0, f'[10] == 1}, f, x] I want to plot f''[0] ...
80 views

### Numerical solution of IVP for linear ODE with variable coefficient runs wild soon

Cross posted in scicomp.SE. A friend of mine showed me this initial value problem (IVP) for a linear ordinary differential equation (ODE) with variable coefficient: y''(x)=\left(x^2-1\right) ...
60 views

### How to clear Mathematica's storage after a large computation? [on hold]

I've done some surfing and haven't found a solution to my problem... hopefully it is a simple one! Here is the problem. I have a Monte Carlo module that is stepping/tracking particles in a ...
70 views

### White Edges Around Graphics Elements

Using the following code, I am able to generate a grayscale Voronoi diagram: ...
38 views

### Replace element of matrix based on rule which invloves other element of same matrix

I am trying to replace 1s row of matrix d iteratively from right by multiplying last element in 1st row with (1-int*dt) to generate 2nd last element. The replacement continues till I reach the 1st ...
59 views

### Force Mathmatica to simplify an ArcTan[]?

I understand that there are many solutions that will produce the same arctangent, nevertheless I really need a simplification: ...
96 views

### Output an Expression in terms of GoldenRatio

Sorry if this is a dumb question (I'm new). I swear I searched and read forums first! I'm trying to rewrite expressions in terms of the Golden Ratio. For example, I know 9+4Sqrt[5] is Phi^6, but can ...
90 views

### How to compute and plot an intersection?

When two surfaces (ParametricPlot3D based on two independent parameters or a CountourPlot3D or a Monge Plot3D with known formula) are placed and plotted together, how is the intersection line ...
94 views

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53 views

### Trouble understanding TrackedSymbols

While developing a relatively complex demonstration for Manipulate I encountered the problem that my output was unintentionally self-updating in an endless loop. ...
35 views

### Tensors with mixed symmetry

I want to work with tensors of mixed symmetry, for example with a rank 3 tensor $A_{ijk}$ that is symmetric under the exchange of $i$ and $j$ and antisymmetric with respect to $i$ and $k$. I was ...
23 views

### STL exports as flat rectangle

I have this code to graph a 3D surface and fill it to the axis: ...
111 views

### How can I reshape my solutions to make a 3D plot?

I need some help on the following. I need to run Solve for multiple values of a and b. To do so instead of using Do, I use ...
67 views

### Applying a texture to part of a sphere

I am trying to texture a sphere with a picture of myself. I don't want it to be stretched across the whole sphere but only to appear on the front. I used ...
17 views

### How can I get the 1-ring neighbor of mesh triangle?

I have an .obj file. I import it into my mathematica and get the vertices and also triangles as follows: ...
177 views

### How to fit a surface to 3D data in Mathematica?

I have a set of data coordinates which is mostly compatible with an Ellipsoid: {{x1,y1,z1},{x2,y2,z2}, ... , {xn,yn,zn}} Now I want to find the best 3d volume ...
33 views

### How to make a widget float?

Is there an option or way to make a GUIKit window remain in on top of other application's windows? ...
29 views

### Replace parts of nested lists

I have list of stock data as follows: lis1= {{{1992/10/12, 126.946, ^AEX}, {1992/10/13, 127.85,^AEX}}, {{1992/10/12, 88.487, ^AFLI},{1992/10/13, 91.825,^AFLI}}} ...
33 views

### Use two functions for x and y coordinates for a plot [on hold]

I try to make a plot out of two functions. It is a cycloid I want to plot. These are my two functions: ...
76 views

### Right Ascension and Declination in astronomical functions

In the process of answering this question, I was forced to confront the various astronomical coordinate systems used by Mathematica. Background In astronomy, positions of celestial objects (stars, ...
22 views

### Convert the output of solve into equality [duplicate]

I know this is has been asked before but seriously, none of the ones I checked helped because they referred to a single variable assignation. Apologies if this is a duplicate. I have many variables ...
38 views

### How to calculate a linear regression on the HP 40gs calculator? [on hold]

I have a question like my title explained. I'm not really a fan of using this calculator but for my studys I have to. So for a simple example, how to I make a linear regression on the HP 40gs on the ...
40 views

### Optimization of custom probability distibutions?

Consider the two tests: Timing[Do[RandomVariate[NormalDistribution[0.5, 0.3]], {200}]] {0.001188, Null} ...
19 views

### Local SEnsitivity Analysis [on hold]

Would some one lead me to a reference where I could have a detailed idea about some local sensitivity analysis methods.
32 views

### Strange behaviour of suggestion bar to solve an ODE, potential bug

InputE^(-(1/2) x[t]^2) (Derivative[1][x][t]^2 - (x^\[Prime]\[Prime])[t]) == 0and evaluate, then press the solve ode button on the suggestion bar. It will return ...
62 views

### Integrate fails for generic parameters but works for any specific values

I was trying to get the following integral ...
56 views

### Completion in terminal?

I know that it is possible to run Mathematica in Terminal. But I didn't find a way to get completion work in Terminal. I mean completion by ...
47 views

### How to replace a part of array based on certain rules which involves usage of other array

I am trying to replace outermost column of array "fd" in below code. fd is matrix of dimension (nas1,nts) which is initially filled with 1. I want to replace outermost column of fd with result of Max ...
28 views

### Get Coefficient of polynomial excluding variables

I'd like to write a function that returns the coefficient of a polynomial, but excludes some 'cross-term' coefficients. The function could be called CoefficientExclude, and the first argument would ...
27 views

### Root: Simplifying symbolic expression

I'm doing calculations with a lot of symbols, which don't always gives nice expressions. Now I have a solution with a Root-expression, where the coefficients are symbolic, e.g. ...