8
votes
2answers
408 views

Tally repeated evaluation of function

How can I tally the result of repeated evaluation of a function? n=100000; f[]:=RandomInteger[{1, 4}] Tally@Table[f[], {n}] When ...
8
votes
2answers
208 views

Does PrivateFontOptions -> {“OperatorSubstitution” ->False} fail in version 10?

Please consider the following, version 10.0.1, OS X Mavericks: ...
8
votes
2answers
308 views

How to reduce the number of operations needed to evaluate an expression? [duplicate]

For some numerical calculations in C++ I have, for example, this complicated expression to evaluate. Given as Mathematica input, in its original form it is ...
8
votes
3answers
1k views

Efficient image Import

I have several sets of 20 images I need to import. Each time they have different categories. "Name"<>"Cat"<>"No" Electric B 1 for example. I need to create lists that contain the images ...
8
votes
1answer
488 views

PrintTemporary in ParallelTable

I thought of a possible answer to Monitor doesn't work with ParallelTable but it doesn't work as I hoped it would. This accumulates print cells instead of deleting them as intended. Can it be ...
8
votes
3answers
1k views

Suppress extrapolation of interpolating function in a ContourPlot

I have defined an interpolating function, myfcn[x], valid on the domain x = 0 to 1.5. I am then using ...
8
votes
2answers
125 views

How to make a notebook take action whenever a particular symbol is defined or redefined?

For teaching purposes, I want to create a Mathematica notebook that will "notice" when the user defines or redefines a variable or function of a particular name, so that it can check the value and ...
8
votes
2answers
429 views

How much time should one give Mathematica for an integral evaluation?

Sometimes when I do integrals in Mathematica (M), it keeps thinking and thinking and I have no idea what is going on inside M. For how long should one wait or how does one know whether M has not got ...
8
votes
1answer
111 views

SparseArray output triggers “unsafe dynamic content” warning

The first basic example in the documentation of SparseArray: ...
7
votes
1answer
336 views

Dataset and string conversion, using Internal`StringToDouble

i'm trying to get familiar with the new Dataset-stuff in Mathematica 10. As it will (hopefully) provide some benefit for me, I have started to convert my app to move from list and list of rules to ...
7
votes
3answers
3k views

How can I scale tick marks without scaling my function?

Take this plot for instance: It shows power in W, but I'd like to see it in µW, so that I get 200, 400, 600,..., which is much more readable. Is there a way to do this without scaling my ...
7
votes
3answers
413 views

Generating a polynomial that's accurate to within an error of no more than 1/10^5

I'm currently stuck on a question for class that asks... "Find a polynomial p[x] that you can use to calculate 6 ArcTan[x] to ...
7
votes
1answer
80 views

Is it possible for librarylink function to be Listable like that in Compile? [closed]

We know in Compile, there is an Option RuntimeAttributes -> {Listable} which can let the compiled function easily explore the ...
7
votes
2answers
266 views

Apply ColorFunction to an Image [duplicate]

is there a faster way to change the colors of an image from grayscale to something like this: ...
7
votes
4answers
154 views

How to map Unevaluated over a list

I have a list {a1, a2, ...... , an}, in which all as have been initialized to a number. I want to get: ...
7
votes
1answer
992 views

Getting clearer StreamPlot output

When I do a StreamPlotof a rather complicated pair of differential equations, it loses some details. For example: ...
7
votes
1answer
579 views

Why Plot3D does not accept Epilog option

I am trying to visualize 3D points with Plot3D using the option Epilog. If you check the options of Plot3D ( Options[Plot3D] ), it can be seen that Epilog is one of ...
7
votes
2answers
1k views

Manipulating plot of random iterated function system fractal

I'm generating the Sierpinski Gasket by implementing a chaos game in Mathematica. What I'd like to do is create an interactive manipulation with a slider, whereby moving it forward, plots all the ...
7
votes
3answers
3k views

Animate ParametricPlot3D for two different parametric equations

I want to write a computer program to generate 3-D plots (with x-y-t axes) to demonstrate the evolution of the two missiles in the following case: i. $x = 100t$, $y = 80t-16t^2$ for $0\leq t\leq 5$ ...
7
votes
1answer
532 views

How to create a multi-selectable setterbar with colored buttons

Background: consider the following code-snippet. ...
7
votes
2answers
169 views

Making ColorSetter work like a PasteButton

I might be missing something obvious here. I am building a palette for constructing code to make certain graphics. The idea is that my colleagues can click buttons instead of having to know the right ...
7
votes
4answers
1k views

Mathematica gives wrong answer for an integral

When I execute the following, Integrate[ Exp[-w^2 + I w^3], {w, -∞, ∞}] I get (2 E^(2/27) BesselK[1/3, 2/27])/(3 Sqrt[3]) ...
7
votes
1answer
791 views

nested use of Apply/Map/MapThread in pure functions

1. My main question I have a function with two argument slots. I wan't to apply this function to 2 lists with different length's. I thought in this solution: ...
7
votes
2answers
315 views

How to make a binary function associative? (Or define an n-ary function?)

Suppose I have a simple function that I assign to an operator f[a_, b_] := a + b CirclePlus = f Then I want to write ...
7
votes
2answers
280 views

How can I construct a recursive pattern guard?

I am modelling binary trees in Wolfram Language by writing them as three-element lists, like so: binTree = {nodeVal, leftChild, rightChild}. It does not yet matter ...
7
votes
2answers
557 views

A topoplot function for Mathematica

Matlab's EEGlab toolbox has a topoplot function: http://sccn.ucsd.edu/eeglab/ A typical topographical plot of an EEG signal is given below: How can I reproduce this in Mathematica. I know that ...
7
votes
3answers
405 views

How to rename a built-in function?

I want a built-in function renamed without loss of any properties, I want the shorter name to appear in all results and to be recognized as input. Is it possible?
7
votes
1answer
961 views

Placing Manipulate controls in multiple columns

I have a Manipulate construct with a square Graphic on the left side and all the controls placed on the right side. There are so ...
7
votes
1answer
414 views

Poincaré map for dynamic billiard

There's a very nice demonstration of dynamic billiard written by Dan S. Reznik that can be found on demonstrations wolfram(along with the code): here I was thinking whether it would be possible to ...
7
votes
1answer
2k views

How to zoom and pan a ListLinePlot?

I'm using ListLinePlot inside a Manipulate function to display some data. I've seen that Mathematica allows zooming and panning ...
7
votes
1answer
212 views

Prevent interdependence of controls

My question is probably best illustrated with this small sample code: ...
7
votes
3answers
400 views

FEM Solution desired for “Plate with orifice” deflection: Application of Boundary Conditions and use of Regions

I found the deflection of an orifice plate (circular plate with a hole) subject to uniform pressure using Mathematica's NDSolve functionality. The plate is fixed at its outer circumference and is ...
7
votes
6answers
705 views

How to draw a dodecahedron with each face modified to a pentagram?

I'd like to draw a dodecahedron with each face carved on the sides so it becomes a pentagram. I wonder how to start to do this kind of task in the Wolfram Language? Edit: The result should still be ...
7
votes
2answers
257 views

Evaluation in lambda function

If I have a function, that returns a function, for example: f[a_] := a^2 * # & then f[3] == 3^2 # & Is there a way ...
7
votes
1answer
106 views

How to convert arbitrary raw boxes directly into String?

This question is motivated by the recent question about searching inside of the NB files. According to the Documentation, ToString expects a high-level WL ...
7
votes
2answers
9k views

Simple ways to evaluate a derivative at a point?

The contrast in behavior between, say, f[x_] = Sin[x^2]; f'[2] vs. u[x_, y_] = Cos[x + y^2]; has always bothered my ...
6
votes
2answers
331 views

Diagonals of a regular octagon

We had a little activity after school today and one of the questions was: All diagonals are drawn in a regular octagon. At how many distinct points in the interior of the octagon (not on the ...
6
votes
1answer
2k views

Export Table from Mathematica into specific cells Excel

How can I export a table to Excel - to specific cells, e.g. D1-E2? Background: I want to compare results, and it's easier to have the results on one spreadsheet. I'm using Mathematica 6. This is my ...
6
votes
1answer
2k views

Any way to prevent Mac firewall from asking to allow connections all the time?

Whenever I start Mathematica 8 on my Mac the built-in Mac OS firewall asks if I want to allow JLink to accept incoming connections. Then, during running, I'll get the same question about Mathematica....
6
votes
3answers
199 views

LogPlot does not show all points

LogPlot ignores points which are going to "too high" values: ...
6
votes
2answers
263 views

Graph does not evaluate some options when not displayed

How can I force Graph to evaluate all its options without actually displaying the graph itself? Evaluating the following code ignores the ...
6
votes
2answers
255 views

How to understand the process of ListCorrelate when it in two-dimensional condition?

Toady,I learn a function ListCorrelate,and I can understand process of execution his result in one-dimensional. However,the ...
6
votes
2answers
741 views

Fitting data to an ARProcess using FindProcessParameters

I have 50 data points that I would like to represent as an AR(4) process. I'd like to over-plot the behaivor of the estimated process model with that of the original (raw) data before I use the model ...
6
votes
2answers
570 views

How to overload System`StringJoin to automatically use ToString on arguments?

I am using an overloaded version of the StringJoin function since years now, without any problem, as I've invested a lot of time and effort earlier to make its ...
6
votes
2answers
338 views

Cannot Get Numerical Results to Match

I try this numerical summation (in two parts) ...
6
votes
1answer
232 views

Keeping vertexcoordinates after adding a new vertex

I want to add a new vertex to a graph, with fixed VertexCoordinates but when I use VertexAdd, the new graph does not have the VertexCoordinates of the previous one. ...
6
votes
1answer
562 views

Parallel optimization of Markov Chain Monte Carlo

I'm trying to reduce the computation time of a MCMC simulation. Essentially I have a set of particles performing a random walk in a periodic random potential. The particles are independent and every ...
6
votes
2answers
172 views

How to group cell type A under cell type B?

My notebook's groupings for "Subsection" and "SubitemNumbered" are broken: And by broken, I mean I wanted it to automatically group like this which I did manually (with lots of control+shift+g) ...
6
votes
1answer
94 views

Problem Using Evaluated Replace with Associations

If I define some function like: toISOdate[data_List]:=DateString[data,{"Year","-","Month","-","Day"}] and try to applicate it in an ...

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