All Questions

25 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. ...
34 views

Manipulate with plot and images

I have the following code: ...
65 views

Manipulating List?

I have a huge list with 1000 elements.Manually entering and calculating SUM of probabilities it would take a few hours. an Example: list = {1, 2, 3, 3, 4, 3} ...
60 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 ...
38 views

Making a black bar in BarChart when using GlassRectangle

I use the command: ...
400 views

Analogue for Maple's dchange - change of variables in differential expressions

Maple owns an interesting function called dchange which can change the variables of differential equations, but there seems to be no such function in Mathematica. ...
230 views

How to suppress Tooltip in built-in templates?

...or maybe switch the message. But I will be happy with no Tooltip at all. I've naively tried with ...
10 views

question on ClusteringComponents

I am fairly new to Mathematica. I've been playing around with ClusteringComponents. Assume we are clustering points in the plane using k-means clustering and EuclidianDistance as distance function: ...
47 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] ...
10 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, positive values are automatically scaled ...
49 views

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22 views

How to invert the default order of polynomial?

By default, Mathematica outputs polynomials starting with smallest degree. How can I invert this?
12 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 ...
144 views

Partition a range of integers into triples

Some time ago, I was asked to look at a simple to formulate puzzle. Consider the list of numbers {1,2, ..., 33}. Try to split this list in 11 triples, such that in ...
16 views

Truncating a List of Subsets of Ordered Pairs

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

How can I make a plot of integer lattice?

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

Definition of function for integration

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 ...
67 views

How to compute and plot an intersection? [on hold]

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 ...
110 views

Formatting an equation: X^Y to pow(X,Y)

I am trying to solve for the intersection of two circles with arbitrary centers and arbitrary radii. ...
15 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: ...
17 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 ...
17 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 ...
41 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. ...
22 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 ...
56 views

White Edges Around Graphics Elements

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

Plot a data of four dimension

I have a confusion recently about the visualization of data.the data you can get there enter link description here.The construction of data is four dimension,like as {x,y,z,color},this is my current ...
29 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 ...
52 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 ...
60 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 ...
52 views

DynamicModule issues with Refresh, double evaluation, and CDF Player preview

I am in the middle of making a CDF for a calculation of many random variables. I've gone with DynamicModule and have read the documentation plus these posts: 32294 ...
43 views

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

A friend of mine showed me this initial value problem (IVP) for a linear ordinary differential equation (ODE) with variable coefficient: $$y''(x)=\left(x^2-1\right) y(x)$$$$y(0)=1$$$$y'(0)=0$$ Seems ...
27 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 ...
43 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, ...
162 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 ...
31 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 ...
130 views

Geocentric, Earth-fixed, coordinates of Sun, Moon (and others objects eventually)

I know I can get "HelioCoordinates" of the Earth and the Moon with ...
46 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: ...
158 views

Issue with Set function

Tables often come with column headers. Indexing the columns with the header is a natural thing to do. Although a proper dictionary is the usual solution in such a case, I find it often practical and ...
227 views
+500

Spiral roots, how?

I found this picture on the net, as I can play in mathematica
95 views

Coarse-graining in numerical integrations

I have been working recently in a coarse-graining problem I found when using NIntegrate: I am trying to evaluate the function $$f(a)=\int_0^{\infty}x\,e^{-(a^2+b^2)x^2}\text{d}x$$ numerically as a ...
104 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 ...
103 views

Dynamic arrays and lists with compile (Append, Linked lists etc.)

I have a code that I need to compile. The code contains a loop in which I need to gather data into a list. The question is how to best gather data so that the code works inside Compile. The following ...
42 views

FrontEndObject::notavail: error when using math

I am new to mathematica script and thus I don't know whether this generated error is natural or not. When I write a command such as echo "3" | math in the ...
43 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. ...
176 views
+500

How can i subtract a surface from another

I have one surface which i got with using analytical solution. And one by ListPlot3D. My question is how can be withdrawn from the one from the another. ...
134 views
+500

why MeanFilter is nearly 100 times slower than MovingAverage for 1D array?

I used to average over my data with MeanFilter before I learn about MovingAverage and thought that these two functions are similar except that MeanFilter is more powerful for its ability to deal with ...
31 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 ...
64 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 ...
By definition, a tropical surface in $\mathbb R^3$ is the set of points $(x,y,z)$ where the maximum $f=max(f_1,f_2,\dots,f_n)$ is attained at least twice, here $f_i$ stand for some linear functions of ...