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7
votes
1answer
184 views

Efficient conditional division

I was curious about the following little problem. Suppose $n \in \mathbb{N}$ is some large number and $p$ is a (possibly large) prime, and I want to update $n$ according to $$n := \begin{cases} n/p, &...
3
votes
2answers
987 views

RegionPlot3D contour problem

I have a little problem and didn't succeed trying to solve it on my own. Situation is, I need a visualization of the function $s - 3\cdot s\cdot q + q$ as a region on p == 0 if function's value is ...
17
votes
1answer
5k views

What method does NDSolve use for solving PDEs?

What is NDSolve's mode of operation? I use it to solve partial differential equations and never gave it too much thought. Recently, I came across this question. ...
26
votes
2answers
2k views

Using a list of tuples in a pure function

I want to use a list of tuples within a function to make assignments. Say I want to make assignments of the form value[i,j] = val What I have is a list of ...
15
votes
5answers
4k views

How can you compute Itō Integrals with Mathematica?

How can you compute Itō Integrals with Mathematica? I tried searching through the documentations but I didn't find anything. P.S. I was not at all sure how to tag this question. I had to put in at ...
2
votes
1answer
333 views

Delete a style type from stylesheet

I have created a new stylesheet but now I'd like to delete a style type, for example "program" from it. How can I do it ?
9
votes
3answers
946 views

Ctrl+= opens the alpha input instead of below-script

When trying to type "traditional style" inputs such as integrals or sums, I follow the tutorial and type Esc sum Esc   Ctrl+= n=1  Ctrl+% 10 whatever However, when I type Ctrl+= it opens ...
12
votes
2answers
408 views

Wrong computation with N

I was trying to solve this problem using Mathematica 8.04. I did this: ...
48
votes
3answers
3k views

Funny behaviour when plotting a polynomial of high degree and large coefficients

I am trying to plot a polynomial of degree $29$ on the domain $[0,1]$, with fairly large coefficients: ...
9
votes
1answer
279 views

Pasting TemplateBox with a Dynamic argument

Ok, this is pretty specific... The objective is to use a TemplateBox to format something that is programatically inserted with ...
18
votes
7answers
15k views

Mathematica: finding min/max in list

I have a list of coordinates like this one: {{x1,y1},{x2,y2},{x3,y3},...,{xn,yn}} I need to get the minimum and the maximum of all x-values and the minimum and ...
19
votes
3answers
1k views

Can CDF file embedded in a web page receive external parameters?

I know that I can embed a CDF file inside a web page by using: The embed tag. An object tag with an embed tag inside (better than 1). Using the JavaScript provided by Wolfram (better than 2). My ...
7
votes
2answers
258 views

Operate on several lists to create one list

How do you put corresponding values from different lists together according to some operation? E.g. I have three lists giving the velocity in the x, y and z direction respectively. I'd like create ...
29
votes
3answers
4k views

Extracting values from nested rules in JSON data

I have been using Mathematica to analyse some data from the StackExchange API. It is conveniently available in JSON form, which Mathematica interprets as replacement rules. However, some of the rules ...
9
votes
1answer
233 views

Is there a way to have a Tooltip for non-editable raster graphics produced by MakeBoxes?

I have a function which produces a large object I would like to hide. Formatting is of course an option but I'm hoping for something a little more meaningful using raster graphics and ...
9
votes
4answers
892 views

Error when using rule as a list index - { i, x[[i]] } /. i -> 5

I can't seem to use a rule to index a vector. x = Range[10]; { i, x[[i]] } /. i -> 5 I get the following error when evaluating the above code, even if the ...
49
votes
4answers
10k views

Why does MatrixForm affect calculations?

This is a really newbie question, but it has me confused. Why does this code work without // MatrixForm and doesn't work with ...
43
votes
3answers
4k views

How to do http POST in Mathematica?

The Import command lets you do a HTTP GET from a URL, like this Import @ "http://merkosoncampus.com/wp-content/uploads/2011/05/higgs-boson.jpg" This sends an ...
5
votes
1answer
2k views

How to use button to evaluate a cell

I would like to create a button that when I click it it evaluates a cell containing a manipulate code. Also, I would like another button that when I click the output of manipulate disappears. How can ...
12
votes
3answers
3k views

How to prevent the welcome screen from showing up after I close my last notebook? (Ubuntu 11.10, MMA 8.0.4.0)

I would like to prevent the welcome screen from showing up after I close my last notebook. This is not an issue on my Windows machine, so I suspect it is system dependent. I am running Ubuntu 11.10. ...
15
votes
2answers
1k views

How to test if optional argument has been given?

I understand that the last call (f[1]) returns True because arg does not exist and thus <...
14
votes
1answer
2k views

Copying an image from the clipboard, modifying it and returning it to the clipboard

I have a Mathematica script to help me copy images from PDFs and then make the (presumably white or nearly white) background transparent. Typically, I am looking at the PDF in Adobe Acrobat and I ...
18
votes
6answers
1k views

Split a string at specific positions

Given a string of alphanumerical characters, how to split it simply and quickly at the center of continuous letter-substrings? Is there an elegant and fast solutions out there in the "computational ...
33
votes
6answers
7k views

From a list to a list of rules

Starting from these two lists, var = {a, b, c} values = {{1, 2, 3}, {4, 5, 6}, {7, 8 , 9}} how can I generate a list of rules? ...
191
votes
9answers
68k views

Elegant operations on matrix rows and columns

Question The Mathematica tutorial has a section 'Basic Matrix Operations', describing operations like transpose, inverse and determinant. These operations all work on entire matrices. I am missing a ...
3
votes
1answer
278 views

Forcing a graph not to resize

This code: ...
4
votes
1answer
522 views

How to draw a gene regulatory state space diagram in Mathematica

Is it possible to draw in Mathematica a state space diagrams like these two?! I tried a lot but since I am fairly new to Mathematica, I could not reproduce the desired result.
25
votes
5answers
2k views

How can I make a 2D line plot with a drop shadow under the line?

You often see plots styled like this (ignore the bar chart component): i.e. with a small drop shadow under the line. (I'm assuming Excel is being used to produce these plots). How could you make ...
46
votes
7answers
6k views

Extruding along a path

I'm trying to render a 3D image of a path by extruding a circular cross-section along the path, to create a "snake-like" path. Here is an image I found to illustrate: I can't seem to figure out if ...
41
votes
6answers
4k views

Partition a set into subsets of size $k$

Given a set $\{a_1,a_2,\dots,a_{lk}\}$ and a positive integer $l$, how can I find all the partitions which includes subsets of size $l$ in Mathematica? For instance, given ...
14
votes
4answers
18k views

subscripts in plot axis labels

Superscripts can be included in axis labels by the use of the caret symbol (e.g., Plot[x^2, {x, -1, 1}, AxesLabel -> {x, x^2}]). How does one include subscripts ...
16
votes
3answers
1k views

Is it possible to insert an animated image into Mathematica notebook?

I find it very convenient to use Mathematica notebooks to organize the codes + results. I was wondering if it is possible to insert an animated image (say an animated gif) in the middle of a notebook....
8
votes
1answer
498 views

CDF and MediaWiki

Recently there was a handful of CDF embedding-related topics. However I would like to ask whether anyone has succeeded in embedding CDF into MediaWiki page? I've attempted to do so with the Widget ...
6
votes
3answers
212 views

Organizing similar datasets using DownValues instead of Contexts

In his answer to this question, Leonid helped me find a way to programmatically generate contexts for holding sets of symbols with the same names. Perhaps a simpler way is to use ...
9
votes
2answers
2k views

shortcut key for traverse command history in a Mathematica session in a terminal?

I wonder what is the shortcut key for traverse command history (i.e. retrieve last, last last, ..., commands) in a Mathematica session in a terminal? If I hit the up/down arrow or pageup/pagedown, it ...
6
votes
2answers
799 views

ParametricPlot3D creates a blank graphic in this case

I have been trying to evaluate the following code, but nothing happened. I don't see any result. ...
16
votes
6answers
4k views

Why can't I define vector v as having subscripted elements v_1, v_2, v_3...?

I'm a very beginner in Mathematica 8 programming. While trying to play a little with tensor analysis I encountered a problem. How to define for example vector in such manner: v={$v_1,v_2,v_3$} For ...
13
votes
2answers
3k views

How to show values of points on surface plotted with ContourPlot3D

The help for ContourPlot3D starts with this example ContourPlot3D[x^3 + y^2 - z^2 == 0, {x, -2, 2}, {y, -2, 2}, {z, -2, 2}] This returns a Plots of the surface $...
6
votes
2answers
4k views

Function to compute the probability of exactly one event occurring out of N independent events

Is there a built in function (or a function in one of the standard packages) that allows you to compute the probability of exactly one event occurring out of some known set of probabilities for N ...
14
votes
3answers
812 views

Palette with editable InputField

I need a Palette with editable InputField. When I try the code ...
10
votes
1answer
728 views

SubTitle and SubSubTitle do not group by default

For some reason, the SubTitle and SubSubTitle cell formats do not group automatically on my machine any more, and I cannot ...
8
votes
2answers
224 views

Make the selection become the button you click

Let's assume I want a button that, when you click it, get the cell that contains it selected. This approach won't work, it selects the cell containg the selection previous to the click. ...
23
votes
2answers
1k views

How can the {x,y,z} points that fall on the outer boundary of a set of values be selected and smoothly surfaced?

For a given set of x,y,z values, that may, or may not form a uniform shape, how can the center of the data cloud be found, and the surface points be located and a solid smooth surface created from ...
5
votes
3answers
3k views

Backsubstituting solution into FindRoot

I am trying to solve a system of equations which is dependent to an parameter alpha. So I iterate over alpha via a ...
40
votes
9answers
5k views

Can I make a plot with gradient filling?

Bloomberg has a standard plot style for its line plots in which it uses a gradient filling. Actually the way this seems to be constructed is that a gradient from the ymax to ymin is used as the ...
8
votes
1answer
175 views

Organizing similar datasets using Contexts or otherwise

I often import several long time series to analyze something about a city. When I have multiple cities, I use contexts. As a simple example, ...
45
votes
4answers
6k views

How can I make an X-Y scatter plot with histograms next to the X-Y axes?

I just saw a nice plot there: How could I implement that in Mathematica — by which I mean the plot structure, not so much the styling.
11
votes
2answers
894 views

Is there an option to plot the Z axis reversed (as shown in the figure)?

Normally the Z axis is plotted from bottom-to-top as shown below : I got a plot with the axis (axes to be more precise) reversed as shown below: Is there a way to force the axes to be plotted top-to-...
23
votes
3answers
6k views

Collapse a section of a huge function

Is there an elegant way of hiding/collapsing/folding only a portion of a function? If functions could span multiple cells, this would have been straight-forward!
10
votes
2answers
1k views

Prevent text from wrapping in a notebook

By default in the Notebook interface the text wraps. Is it possible to prevent this wrapping?

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