All Questions

96 views

ReadList or any other command to read in blocks of very large numbers

I have a data file, data.txt, having following data: ...
51 views

How to use many global assumptions [closed]

I would like to use many global assumptions. Say I have two global assumptions. $Assumptions = 0 < a < 1$Assumptions = 0 < b < 1 Then I would like ...
52 views

Problem with importing numbers resulting from an executed file in Mathematica [closed]

I am running Mathematica 10 and I have a mathematica file, MBdebug.m, that contains the line val = Import["! ./MBpart1ep0", "Table"]; MBpart1ep0 is an ...
39 views

Strange behaviour of Set and Part when given a sequence

Consider this example: lis1 = {a, b, c}; lis1[[2]] = Sequence[e, f]; lis1 (*{a, e, f, c}*) lis1[[2]] (*e*) lis1[[2]] = Sequence[g, h]; lis1 (*{a, g, h, c}*) It ...
64 views

DSolve results not what expected

I have the following formula: s'[t] == 230.94 Tan[0.914743 - 0.138564 t] When I solve this by hand I get: ...
126 views

Retrieving coordinate positions using ChemicalData for input to quanutm modelling software

I am trying to set up an input file for a quantum chemical modelling software. How do I obtain the (XYZ) coordinate positions in Angstroms using information obtained using ChemicalData. Have some ...
150 views

Mesh for points in 3D

I've got a set of Eisenstein integers (triangle lattice points in the complex plane), and I've selected them to be above a line, so that they form a triangle: I then took these 2D points and ...
39 views

Compiled DiagonalMatrix

The standard function DiagonalMatrix cannot be compiled, so I tried writing my own: ...
94 views

How to use a custom CDF in a Kolmogorov-Smirnov test

How do I use a custom CDF that I defined for a Kolmogorov-Smirnov test. I have one input vector of data whose CDF I claim to have derived but want to check whether it agrees with my closed form ...
45 views

Getting message NIntegrate::inumr: in V10; did not happen in V9 [duplicate]

I just tried making a ParametricPlot that worked error-free in Mathematica 9, but now produces errors before successfully plotting in Mathematica 10. It appears to ...
1k views

Solve Laplace equation using NDSolve

I am new to Mathematica, a friend recommended this software and started using it, in fact download the trial version to know. I recently did a program in C to calculate numerically the solution to ...
160 views

How to define a function or procedure that includes multiple steps?

I would like to define a procedure or function that takes as input an integer, s, and gives as output two nested lists. I have written code (shown below) that does this for one particular value of s, ...
166 views

Save output of NDSolve to a file

I am solving following differential equation using Mathematica, ...
232 views

Syntax of transpose etc [closed]

This is a simple question: {{0, 1}, {0, 2}, {0, 3}}*Transpose[{{0, 1}, {0, 2}, {0, 3}}] returns an error in Mathematica but works perfectly fine in Wolfram Alpha. Can someone help me? Thanks so ...
145 views

Simpler code evaluating Dickman's function?

I've read here that Mathematica 10 can Obtain symbolic solutions to delay differential equations. Would that help in numericaly evaluating Dickman's function $\rho(u)$ ? It is a delay differential ...
143 views

Understanding Dirichlet regularization in Sum

I've tried to calculate few classic sums using Dirichlet regularization: ...
57 views

How could I make visible the convex hull of 3 point inside this region?

Small version of the question How can I control the color and the Thickness of this graph?? ...
106 views

Selecting from Manipulate for ParametricPlot3D

, Referring to yesterday's "Switching parameter lines on/off in a 3D parametric plot" (Switching parameter lines on/off in a 3D parametric plot) From reply by Bob Hanlon for example, can we pick up ...
45 views

Automatically restoring the state of a prior session [duplicate]

I have the following problem (I guess a very naive one): I work with some data and make a statistical analysis in Mathematica. I do it over several days and each time I open the file, I have to go ...
107 views

how to find the vector intersection in a collection of triangulated 3D points?

I'm trying to calculate the 3D point coordinates for the intersection of a vector with a plane. I have been using the following code to do this: ...
78 views

How to append to a list of lists elegantly [duplicate]

I have have list of lists and I would like to be able to append an element to the start of each list. I am sure there must be an elegant solution. EG: a and ...
103 views

Wolfram Workbench autocomplettition

Suppose I have some project in Wolfram Workbench. In some packages need DatabaseLink. I write it in this way: ...
523 views

...
157 views

Why ColorReplace does not follow the rules specified?

I tried to use ColorReplace to change the colors obtained from MorphologicalComponents. However some of the changes didn't ...
71 views

Geomarker Scaling

Struggling to get a 3d cylinder to scale properly on a street map. I want to use the stacked cylinder as a custom pin. ...
289 views

How to use Mathematica to turn a picture into low poly style?

I want to use Mathematica to turn a picture into low poly style. That is, to make the following conversion: Bill to Bill low poly(Using Image Triangulator App). I think the biggest difficulty is how ...
245 views

How to do color-fill in Mathematica?

Color fill, the ability to apply a desired color to an enclosed area, is one of the basic functions provided by most graphic applications. Is there a similar ...
139 views

FindRoot kills kernel

Bug introduced in 7.0.1 or earlier. Persists through at least 10.0.2 I'm having problems with FindRoot killing the kernel. In my real application, I want to FindRoot on a black-box function ...
133 views

Generating function for Newton series?

The function GeneratingFunction gives generating function for Taylor series. Is there a similar function for Newton's series? $$f(x) = \sum_{k=0}^\infty \binom{x}k \Delta^k [f]\left (0\right)$$
44 views

Calculate deviation of sum of several equal normal distribution [closed]

I have a normal distribution with mean m and standard deviation d. How can I calculate what will be the deviation if I add N such distributions? As I understand, mean will be m*N. Will standard ...
231 views

Splitting a string into substrings of length 1 and 2

There is already a thread on how to split a string into equal sized chunks. I'm wanting to split a string into sets of substrings of length 1 and 2. For example, if I have the string "123456", my list ...
71 views

ListLinePlot of data imported from an Excel file [duplicate]

This is a continuation of another very similar question about how to plot structured data using ListLinePlot. Here is a sample data imported from an Excel file: ...
77 views

I have defined several custom analytic functions. Here is the simplest example: ln[x_, a_?NumericQ] := Piecewise[{{Log[x], Re[a] > 0}, {-Log[1/x], True}}] ...
57 views

NIntegrate::ncvbr: How should we interpret and handle this error not mentioned in any documentation?

I have some user-defined module describing my integrand which has to be computed numerically (it's much more complicated than this but bear with me): ...
123 views

Statistics confusion

I have two data sets. When I do a QuantilePlot[data1, data2], I get the graph below. However, ...
71 views

Complement[] changes order of elements?

Consider this example: Complement[{a, y, c, d, e}, {a, c}, {d}] (*{e, y}*) However, I was expecting the result to be: ...
206 views

Is there a built-in function which detects singularities in a function?

Given a function f[x] and a region M in the complex x-plane, how can I find singularities of f in this region, i.e., issue a ...
59 views

How can I “ORDER BY” using SQLSelect?

A pretty straightforward problem, you would think, but I cannot seem to find the answer in the documentation for SQLSelect. The query I want to run is the following: ...
125 views

(Very) ill-behaved Piecewise Plot

I am interested in defining a function (with arguments: a symbol for a variable and a list of 6 points) that represents a quadratic interpolating spline of the points. Here is my attempt ...
127 views

Switching parameter lines on/off in a 3D parametric plot

In a classroom demonstration for ParametricPlot3D [{f[u, v], g[u, v], h[u, v]}, {u, ... }, {v, ... }] I want to show u lines only without v, v lines only ...
4k views

1k views

Flying to Australia

I want to compare different flight routes to Australia and their lengths. So far I have written: ...