All Questions

When I want to copy a scientific notated number from a TraditionalForm output to an input it formats it in a weird way: Another thing I want to do is only copy a few number of decimals, and remove ...

In version 7 there exist these Internal` context functions: ?Internal`*Periodical* AddPeriodical   ...

I have an assignment where I need to compute chemical reactions by solving ODEs. I use NDSolve to do this. However, for one problem it does not give me the ...

I have two sets of x,y coordinates, and want to plot them both on the same graph. With one set, List1 $= \{ \{ x_1, y_1 \}, \{ x_2, y_2 \},\{ x_3, y_3 \}, \cdots \}$ I can use ...

The input ToExpression["\\sqrt{x y}", TeXForm] gives me the $Failed output. Maybe my very old computer is the problem, but ...

Is there any way to "close" a package (or a symbol, or a context) in that if a user of the package adds definitions to the symbol they will be tried before the package defined ones, just like what ...

Sometimes when generating a lot of data the memory usage shoots beyond its physical realm and my laptop freezes. There is no way to stop Mathematica when this happens. Task manager (or its equivalent ...

I like to use Mathematica text cells for creating draft technical documents. When entering equations in a text cell, the ^ (hat accent) does not dynamically adjust its size to fit. It looks good if ...

I use the following code to draw Arrows on Axes in 2D graphics: ...

I've difficulites with the NonlinearModelFit function. In principle Mathematica should be able to deal with complex data. E.g. if I define the following table <...

I am trying to import a group of PDFs that I have downloaded (it is in the realm of 1,000+). They are a group of doctoral dissertations that I'm trying to automatically extract bibliographic ...

UPDATED This question is about: "What is the pattern to match a pattern-definition, exactly as it is written?" My original question is now split according to Mr.Wizards insightful answer below. This ...

I am trying to visualize a list of positive integers using a bar chart. In general, integers in that list may appear more than once. For example, I may have ...

Is it possible to access a USB webcam through Mathmatica on Linux? When I run ImageCapture[] I get the following output ...

I am trying to solve a chemical equilibrium ODE with NDSolve where one function is the argument to another. I.E. My equations look like: ...

What I want to do is in any way produce a picture that looks like this Given a set of words, how can I partition a disk into bricks for these words, such that it looks good? Here is my sucky ...

I'm having a hard time to find a solution to a numerical limitation on mathematica: ...

I found the following code: Compile[{{m, _Real, 2}}, Fourier[m]][Table[N[i - j], {i, 4}, {j, 4}]] which doesn't work correctly. But the following was posted as a ...

In the code below the value displayed next to the slider may be correct, and should be the result of The value of x for cyL and ...

I am able to evaluate a held expression that I have put on a list by: ReleaseHold[expressionList[[1]]] and ...

For finding location of spikes in a time series I used to transform the data into wavelet space using DiscreteWaveletPacketTransform [ data, filter, 0] and then ...

If I have an undirected graph G, how could I write a function in Mathematica to obtain a list of subgraphs of G that are isomorphic to some other undirected graph SubG? I'd like to learn how to ...

I'm trying to write an expression deconstructor or FullForm-capturer; might even call it a parser, maybe, but that might be too glorious a word. I got some great ...

At present I am running an analysis on economic data. Within the data I was able to identify countries which went through recession. I then calculated for example the average decline rate of GDP ...

Several Graphics primitives are listable. For instance, Point accepts lists of coordinates so that multiple calls to Point are ...

(Apologies for the long question title.) One of the interesting, if sometimes confusing, things about Mathematica is that there is always more than one way to do things. Even intermediate users can ...

Bug introduced in 8.0 or earlier and fixed in 9.0.0 I integrate Integrate[Exp[I Cos[b - c]] Cos[b], {b, 0, 2 Pi}] Mathematica gives: ...

I'm trying to animate some curves that wrap around a cylinder. OK so far: ...

Let's look at the following example. Ordering[{0, 20 Sqrt[5], 40 Sqrt[5], 20 Sqrt[5], 20 Sqrt[10]} // N] gives the right answer ...

This question is very similar in gist to equation solving with GroebnerBasis, but hopefully when I say that I make the system a little larger I mean little. I have ...

If I have an undirected graph represented with an adjacency matrix, how can I find all the subgraphs which are a cycle of length N? I don't really know the math nor the programming language well, so ...

I want to create graphs interactively using a GUI. I thought of using a ClickPane[] environment. The code I have (in part borrowed from the Documentation) works ...

I want to parallelize heavy computations which has to be done many times, the result should be arrays of data. Each calculation does not depend on others (but uses the same variables though). The ...

Below is an example of a gaze sequence I recorded during a 3 seconds display. That is, where the eye was at every millisecond. While we should have 3000 points, we are missing some due to blinking. ...

I cooked up this simple bit of code in hopes to exceed pseudorandom number generation maybe touch the face of true randomization: ...

Often I have Notebooks where I generate several images and export them into files. Now when I want to change one image, I'd like to just re-evaluate the complete notebook, however I generally do not ...

What is the most simple, elegant way of implementing a rewrite-system defined as: $$ \begin{aligned} \Sigma &= \{a_1, a_2, a_3, ...\} \\ N &= \{A_1, A_2, A_3, ...\} \\ \{\alpha_1 , \...

Brief Question about how to best match lists with Criteria from Identifiers (thus for me: translate SQL to Mathematica ;) ). If I have two sets: ...

I'm looking for the best function to apply the product of the last two elements of sublist elements to each element: Example: ...

I think I know the answer to this, but after two days of Googling, this is my last effort before going down an unwanted path... I have a function that takes lots of large data as arguments as well as ...

I know that there are methods to structurally manipulate held expressions (discussed e.g. here), but I failed to apply those for this particular problem: ...

I would like to copy the address of a hyperlink in Mathematica using the keyboard. I found code for copying hyperlink addresses in ContextMenus.tr: ...

I would like to create a hierarchy of TestSuites. However it appears that it is not possible to call a TestSuite from another <...

I'm using SingularValueDecomposition for a least-squares regression, the instruction that works fine for what I need is ...

I have a system of quadratic equations defined below ...

In scanning through a simple imported file of weather station data, some dates have missing data. What is a test to use to check whether a datum is valid? I tried ...

In the Add Error Bars to Charts and Plots How To in the Mathematica documentation a function ErrorBar is given: ...

I'm trying to label a bar chart with rotated labels see this simple example: ...

Given a function with the attribute HoldFirst, HoldAll or similar, and a variable, list, how ...

This question mentions "x := x = trickery". What does defining a function as f[x_] := f[x] = ... do and what is it good for?