All Questions

4
votes
2answers
307 views

Problem with EllipticE documentation

The complete elliptic integral of the second kind, EllipticE, is defined as, Integrate[Sqrt[1-m Sin[t]^2],{t,0,z}] According ...
23
votes
1answer
602 views

Is there an equivalent of FullGraphics for Graphics3D?

For 2D graphics, there exists the function FullGraphics to turn the stuff Mathematica generates automatically on Graphics (like ...
109
votes
7answers
13k views

Struct equivalent in Mathematica?

I really miss having something like a struct in Mathematica. I know of (and regularly use) a couple of programming techniques which feel like a ...
24
votes
3answers
2k views

How to find pieces of code responsible for syntax errors?

Especially: How to find the piece of code responsible for a missing parenthesis problem caused by a misplaced SuperScriptBox For last 30 minutes (and I was lucky ...
20
votes
6answers
1k views

On generalizing Partition[] (with offsets) to sublists of unequal length

The usual Partition[] function is a very handy little thing: ...
15
votes
4answers
1k views

How can I create a ColorFunction using Blend?

As shown below, I am trying to find a cool way to show some variance weighted deviation from the mean. There are 10 attributes that I compute the distance for. How can I add a color function such ...
24
votes
5answers
6k views

sprintf() or close equivalent, or re-implementation?

Is there a sprintf() command (some command that takes a printf-style format string and a list of values to insert into the ...
2
votes
4answers
11k views

Creating a data1 versus data2 plot?

I have a table of data with multiple rows and columns, and I have to make a versus data table using two of these columns. Essentially, I have to set one column of data (column 3) as the y-axis and ...
8
votes
4answers
2k views

Styling ticks, axes and other elements in a Plot of a step function

To display the effect of uniform quantization (step size Q) I would like to draw a curve as shown below I tried this using ...
12
votes
7answers
3k views

Combination and Permutation

How could I obtain the list of all the groups of 5 numbers taken from Range[12] such that the 2 lists have an empty intersection : ...
22
votes
2answers
3k views

Finding a subsequence in a list

I have a list and I want to find (in this particular case the first) appearance of a any of some subsequences, of possible different lengths. None of the subsequences is a subsequence of each other. ...
36
votes
4answers
4k views

How to make a drop-shadow for a Graphics3D objects?

What's the best way to make a drop shadow for a 3D object? image = Graphics3D[Sphere[], Boxed -> False] I can get a blurry black outline of this: ...
9
votes
2answers
161 views

How to make TraditionalForm display the same in the Manipulate output as in a notebook?

I noticed that TraditionalForm does not display as nice in the Manipulate output as in normal notebook. Is there a way to make it look the same? Here is an example, ...
10
votes
1answer
932 views

How to import date (YYYY-MM-DD) data from a file?

I have a file with data in form {date, value}: 2010-05-19 17 2010-05-20 20 ...
49
votes
2answers
19k views

Can we use letter with a subscript as a variable in Mathematica?

I tried Subscript[a, 0] = 1 (* 1 *) Clear[Subscript[a, 0]] ...
34
votes
5answers
3k views

Are there “All” and “Any” functions in Mathematica?

In Python, there is a function all which returns true if all of its arguments are true, and any which returns true if at least ...
33
votes
3answers
1k views

How do I add new menuitems to menus?

What are some complete examples of what one would include in a FrontEnd init.m that would make use of FrontEnd`AddMenuCommands ...
17
votes
7answers
4k views

How to find rows that have maximum value?

Suppose if I have following list { {10,b,30}, {100,a,40}, {1000,b,10}, {1000,b,70}, {100,b,20}, {10,b,70} } How to find rows that have max value in ...
9
votes
3answers
2k views

Replace expressions with symbols

First of all: I'm new to Mathematica, so I would appreciate it if the answers are quite complete. I have the result of calculation that is expressed in $\sin$ and $\cos$. Now, all of these can be ...
11
votes
2answers
1k views

How to add an interpolating point to InterpolatingFunction?

Suppose I have an InterpolatingFunction object defined on $[\epsilon,1]$; let's call it f. What is the best way to construct a ...
14
votes
2answers
2k views

Representing second derivatives with a double overdot

I would like to express a second derivative with two dots above the variable. You can do this with a first derivative by saying: ...
19
votes
5answers
1k views

Using DynamicModule variables outside the DynamicModule

Take the following example for hiding/showing a notebook through a Checkbox: ...
7
votes
1answer
679 views

How to solve this iteration in the functional programming way?

I am trying to come up with a functional programming method to calculate a list of replacements, that depend on previous replacements. Since there is always a finite number of steps, I would like to ...
11
votes
2answers
238 views

Bags and non-standard evaluation

What can internally be happening here? Is the evaluator just messing with us and going non-standard because it's a Bag? Or am I just not seeing how something like ...
13
votes
4answers
1k views

Subscripts - Why do I see the error “only assignments to symbols are allowed” when using a Module and not otherwise?

When I type Remove["Global`*"] foo[] := Module[{Subscript[a, 1] = "x"}, 0]; foo[] I get the expected error "only assignments to symbols are allowed". I ...
43
votes
4answers
11k views

Simultaneously fitting multiple datasets

What is the proposed approach if one wants to simultaneously fit multiple functions to multiple datasets with shared parameters? As an example consider the following case: We have to measurements of ...
9
votes
3answers
619 views

ListPlot InterpolationOrder->0 datapoint centered

it is possible to get a histogram style in ListPlot using InterpolationOrder->0 ...
14
votes
0answers
464 views

Is it possible to regain Mathematica 5.2's palette input focus behaviour with version 8.0?

Between Mathematica 5.2 and later versions, there has been a change in determining which notebook gets the palette input focus, which leads to quite unfortunate behaviour if you use focus-follows-...
5
votes
1answer
2k views

MaxSteps and Computing time issue for Solving Differential equation in Mathematica

When we solve differential equation numerically using NDSolve then sometimes we get error like NDSolve::mxst: Maximum steps reached According to Mathematica docs ...
71
votes
2answers
6k views

Is there a way to separate variables between multiple notebooks?

I often correct homework by checking the calculations in Mathematica. Sometimes you would like to have two solutions open at once. However often defined symbols such as ...
83
votes
6answers
76k views

How do I clear all user defined symbols?

Is there some way to do this other than going to Evaluation -> Quit kernel and firing a new one up?
70
votes
2answers
4k views

Internal`Bag inside Compile

Since Internal`Bag, Internal`StuffBag and Internal`BagPart can be compiled down, it is a ...
22
votes
2answers
910 views

Are there any “RLink” like projects, which enable the interaction between R and Mathematica?

I want to borrow the vast amount of packages of R. I know there was one but it is neither sold nor supported anymore. So are there any active open source projects for linking R with Mathematica? Thank ...
101
votes
9answers
5k views

Functional style using lazy lists?

Let's say I want to answer the question "what are the first 400 palindromic prime numbers?" The first approach that comes to my mind from the set of languages that I know is to use some sort of lazy ...
3
votes
1answer
777 views

How to make GraphicsGrid with content tight inside it?

I am trying to use GraphicsGrid to typeset some labels for my plots. I found the labels look little better when I use GrapicsGrid vs Grid. The labels have equations in them and not just plain labels. ...
9
votes
2answers
1k views

Outline Numbering for Mathematica Section/Subsection Cells

I am trying to create a LaTex-style document with Section numbers of the form 1.0 and then subsection numbers 1.1, 2.1, etc. I need the numbering to be automatic such that if I insert a new subsection,...
19
votes
3answers
1k views

Centering date labels over the year in a DateListPlot

The canonical formatting for date labels in a DateListPlot is for the year or other date label to be centered over the tick at the start of the relevant period. <...
48
votes
4answers
6k views

How well does Mathematica code exported to C compare to code directly written for C?

Essentially what it says in the title. Mathematica can export its code to C. How much overhead does that inflict on the code, as compared to writing it from scratch in C?
11
votes
2answers
1k views

Series expansion of an inverse

I have to find the series expansion of the inverse function of : $\arctan\left(\frac{\ln(1+x)}{1+x}\right)$ How do I find out the series expansion of any inverse ? Note: The inverse of a function $f$...
15
votes
2answers
1k views

How to create a group action table with Mathematica?

Background: I want to explain the Sylow Theorems as detailed as possible, therefore I am rewriting the proof using concrete examples. Since the answers to my questions ( about Mathematica ) have ...
14
votes
2answers
3k views

Flatten at a certain level

In an earlier question the brainteasing fourth syntax variant of Flatten was discussed. I see that with ...
7
votes
4answers
2k views

Plot Ellipse based on EigenSystem

Please consider the following : ...
23
votes
4answers
2k views

How can I specify the arrowhead size in printers points?

Is there any way to specify the size of an arrowhead in printer's points? I'm looking for something that would have similar functionality to AbsolutePointSize, <...
40
votes
5answers
2k views

How to create symbols from strings and set values for them?

I am trying to convert a list of string names into symbols, which will then be used to store data. I have 24 files (where the name of each file is a member of the list mentioned above) that I need to ...
11
votes
3answers
606 views

How can I speed up SQL queries in Mathematica?

I have an application that queries a MySQL database many times for data. At the moment, Mathematica and MySQL are running on the same box and yet it takes over 1.6 seconds for the query to run and ...
10
votes
2answers
1k views

Efficient by-element updates to SparseArrays

I have a very large SparseArray called A. What is the most efficient way to update say element ...
33
votes
2answers
5k views

Way to improve “show me this decimal number to M places, don't use scientific notation”?

The best way I can come up with to say "show me this fraction as a decimal number to M places, don't use scientific notation" is: ...
5
votes
2answers
262 views

How to work around Column cutting off a pixel row from images?

I have a problem where Column will occasionally cut off a single pixel from the top of images. To reproduce the problem, evaluate this: ...
10
votes
4answers
642 views

Typography messed up in prints

For a long time now I've had trouble printing Mathematica files. While the .nb itself displays just fine on my screen, the kerning is awful when printed. Screen: Print: And in case you ...
32
votes
2answers
10k views

How to enter matrices in block matrix format?

Example: I have a matrix $R = \left( \begin{array}{cc} A & \mathbf{t} \\ 0 & 1 \end{array} \right) $ where $A$ is 3-by-3 and $\mathbf{t}$ is 3 by 1. Or in Mathematica ...

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