5
votes
4answers
384 views

Manipulating Equations

I would like to be able to manipulate algebraic equations. For example, let's say I enter 3x+5==2 I would next like to be able to manually subtract $2$ from both ...
34
votes
9answers
1k views

Happy 2K prime question

This being the Q number 2K in the site, and this being the day we got the confirmation of mathematica.se graduating soon, I think a celebration question is in order. So... What is the fastest way to ...
10
votes
1answer
217 views

How to pass composite function list to SortBy?

In order to sort alphanumeric-as-string data of the form {"T3", "T14", "T1", "E2"}, so that "T14" comes after ...
26
votes
6answers
1k views

Faster alternatives for DayOfWeek

It has been noticed on several occasions that DayOfWeek function is rather slow when applied to a large list of dates, e.g. in this recent question. What faster ...
4
votes
1answer
134 views

What it is the best way to enforce that only one CreateDialog window can be created?

Background. See question Moving controls from Manipulate to a Palette ( or similar GUI object ). As suggested in the answer to this question I use a CreateDialog window to group and handle controls ...
2
votes
2answers
327 views

Pattern test for variables during function definition

I am having a problem with pattern testing on variables during function definition ...
4
votes
1answer
515 views

How to create tournament bracket

I'd like to create a tournament bracket using Mathematica. I've looked around online, but haven't found any examples yet. Can someone show me how to do this? Specifically, I'd like to have a ...
12
votes
2answers
627 views

Using LaunchKernels to launch kernels with lower priorities

On windows the kernels launched with LaunchKernels are starred with "Below Normal" priority. Is there a way to start them with even lower priority (eg. "Idle")? ...
4
votes
2answers
271 views

remove quotes in a combination of a text with graphics in the JournalArticle Style

I have a puzzling and very specific question. It may be of limited interest to community. I apologize in advance in this case. Let us see. I am making an illustration to a text that I write in the ...
10
votes
3answers
547 views

Mathematica Plot: Inconsistency when plotting large values

I am working with a function in Mathematica and I am getting some inconsistencies when I plot it. As I really need to understand were this comes from I would appreciate any help. I am working with a ...
7
votes
3answers
674 views

Can I limit PlotRange for 1 function in a Plot?

I have a 2D Plot of 3 functions Plot[ { f1[x], f2[x], f3[x] }, { x, 8, 18 } ] where I want f3[x] only plotted for the range [10, 18] instead of [8, 18]. Is that ...
5
votes
1answer
403 views

Tridiagonal symmetric matrix eigenvalue using bisection

I know that Eigenvalues is already quite well implemented in Mathematica, nor am I foolishly trying to improve on it. In order to improve my programming skills, I ...
4
votes
2answers
3k views

Problem with the DSolve function

OK guys, here's the thing, Mathematica does not return a solution for this system of differential equations: ...
2
votes
3answers
210 views

Ways to change an explicit function into a pure function

I'm trying to use FixedPoint to solve a transcendental equations, but the first argument of the FixedPoint should be a pure ...
5
votes
1answer
167 views

Why is SystemDialogInput failing to return a save file path?

I am encountering a problem using SystemDialogInput within a Button. The code below shows what I am doing. To test this create a ...
9
votes
3answers
4k views

Expressing a decimal as a fraction in lowest terms

How can I express a decimal such as 0.1845095405274387 as a fraction in its lowest terms?
6
votes
1answer
609 views

How to Simplify equations over a Ring with Mathematica?

For example, when we work over a ring, the equation x^3=0 does not imply x^2=0 or x=0, but ...
3
votes
1answer
248 views

How to write output to an external text file in addition to the standard output stream?

How to write output to an external text file in addition to the standard output stream, i.e. a notebook for a session with FE and stdout for command-line session?
2
votes
2answers
481 views

How to do substitution of variable with power in Mathematica?

I want to replace $x^{i+1}$ with $z_i$. EDIT: I have some latex equations, and wish to import them to MMa. How to replace x_i (NOT $x_i$) with $x[i]$ But it seems the underscore "_" has a special ...
5
votes
1answer
124 views

RankedMax and Max do not behave identically

I have spent three hours debugging some code and at the end I think I found a bug. Otherwise I cannot explain what I am seeing: When I want to use RankedMax on ...
3
votes
6answers
915 views

Getting a String from a list of strings

Is there a way to write down Mathematica with a string such as: {"M","a","t","h","e","m","a","t","i","c","a"}?
8
votes
1answer
322 views

What is a good coding style for setting and changing application level constants?

Background: Every application has user-definable constants. The Java language has the Properties class to handle them. Question: What is a good and re-usable coding style for setting and changing ...
1
vote
2answers
338 views

How can I enhance ImageCompose to blend multiple layers?

Blend modes (or Mixing modes) in digital image editing are used to determine how two layers are blended into each other. Version 8 has functionality to perform binary and basic alpha blending but ...
2
votes
1answer
272 views

Can Mathematica help a theorem to be alive?

We are used to do limits by means of $\epsilon, \delta$. This is the first step an student encounters limits. Using $\epsilon$ and $\delta$ leads him to be familiar to Logic. I have taught limits and ...
7
votes
1answer
296 views

How can I extend BinCounts to work on Times and Dates?

I want to extend BinCounts to work on a list of times or dates, binning them by Day, Week, Hour of the Month, Day of the Year, etc... So given a list of times and a time bin spec, I need to calculate ...
12
votes
1answer
528 views

CDF, Player, PlayerPro, or something else?

I have a notebook, which contains a dozen or so custom functions all leading to the production of a simple static report, something like this: I want to distribute this to a single user who will ...
19
votes
2answers
1k views

How can I customize arrowhead shape to match common LaTeX styles?

How do I control the shape of my arrow heads? LaTeX's TikZ package has a wide variety of predefined arrowhead styles, some of which I'd like to try to match for Mathematica figures I'm importing into ...
3
votes
2answers
124 views

Why do I keep getting 0.06 with WorkingPrecision->1?

I'm trying to generate a list of 1000 random numbers with WorkingPrecision->1. Is there any particular reason that I'm getting some entries as 0.06? I have tested the following lines: ...
1
vote
1answer
168 views

boolean return value in mathematica

why does the following instruction ok in mathematica, and it returns a boolean value In[398]:= catenary[x, 1, 0, 0] == catenary[-x, 1, 0, 0] Out[398]:= True and ...
16
votes
3answers
600 views

Function that counts the number of arguments of other functions

I have a newbie question: is it possible to write a function that counts the arguments (total and optionals) of a given function? Possibly it should be able to work with built-in and custom functions ...
2
votes
1answer
357 views

Laplacian or Grad of an InterpolatingFunction

For obtaining a Schlieren image from an equation for density, I need to calculate the first derivative of density and make a contour plot. The below code snippet calculates the first derivative w.r.t ...
1
vote
3answers
2k views

How to write values of function to file?

For example, say I wanted to plot Sin(x) like this: Plot[Sin[x],{x,0,2 Pi}] But instead of plotting to a graph, I want to now tabulate the values of Sin[x] to a ...
1
vote
2answers
142 views

How can I crop manipulator from a plot

I wanted to know how can I crop a Manipulator from a plot. the code for plot is ...
3
votes
4answers
1k views

how to plot $x=0$ and $y=0$

I tried to plot plane $x = 0$ and $y=0$ with Plot3D[x = 0, {x, -4, 4}, {y, -4, 4}] but it seems that it didn't work out. How can I plot the above planes? Also ...
2
votes
2answers
254 views

Varying plot sizes for identical PlotRanges in ListLinePlot, where one has a legend

I am trying to make some figures using ListLinePlot in Mathematica 8. Although the PlotRanges are the same, the resulting frame sizes are different. The only difference (as I see it) between the two ...
15
votes
1answer
538 views

Parallel compiled functions running on parallel sub-kernels

Question Why is it, that compiled, Listable, parallel functions which work perfectly fine on the main kernel, do not run in parallel on sub-kernels? Details ...
20
votes
2answers
2k views

How to make Fourier behave like FourierTransform?

I'm not very experienced with Fourier Transforms, so there may be something inherently wrong with attempting to do this, but how can I make the discrete Fourier behave like the continuous ...
7
votes
1answer
431 views

Want Interactive PlotRange of Graphics[{}]

I am trying to do: ...
6
votes
2answers
248 views

Formatting text through pattern matching

I am trying to format some text based on some patterns. ...
7
votes
1answer
304 views

Is it possible to construct a function to make a poor man's Mathematica database?

I have a function that is set up to write to a database with 10-20 standard variables with 10 fields each, but the application is going to a place where database access is not available. Can ...
7
votes
2answers
1k views

Create complicated text formulas in graphics

I want to put somewhat complicated, or at least non-standardly formatted, text on some of my graphics. For example, I'd like to be able to use f^[4](x) (where the ...
18
votes
2answers
1k views

How do I perform string matching and replacements?

What are, and how do I use Mathematica's string matching and replacement tools?
7
votes
3answers
257 views

Safely nesting RuleDelayed

Say I have the following, straightforward-seeming functions: ...
17
votes
5answers
2k views

The difference between 0. and 0

I have a function for which 0 is a special case: f[A___, 0, B___] := 0 But since I am doing numerics, sometimes in the course ...
11
votes
3answers
174 views

Emulating Sequence with my own function

I just considered if/how one could implement Sequence in Mathematica if it were not predefined. It turned out that the following simple definition has in all my ...
2
votes
4answers
203 views

Remove anything between () except for ; in a string

A simple question but I can't find the answer. I'm scanning a huge pile of mails and would like to get rid of anything between () in the email adresses since this normally contains just info that ...
3
votes
2answers
793 views

Use ColorFunction in ListLinePlot with If

The following code ListLinePlot[{2, 4, 6, 8, 10, 12}, ColorFunction -> Function[{x, y}, If[x <= 3, Blue, Red]]] should produce blue lines for $x\le3$ and ...
4
votes
1answer
113 views

Is there a way to programmatically do a “save as ” on an init.nb file to save it as init.m?

I am using Mathematica 8.0.4.0 running under Windows 7. Is there a way to programmatically do a "save as " on an init.nb file to save it as init.m? In the documentation center under ...
6
votes
4answers
315 views

Why does my function defined with constraints on patterns not work? [duplicate]

Possible Duplicate: Why doesn't PatternTest work with Composition? My function is something like this, ...
11
votes
2answers
578 views

What is the precedence of FrameStyle, FrameTicksStyle, and LabelStyle? How to have a LabelStyle different from FrameStyle

From the documentation: Plot[2 Sin[x], {x, 0, 10}, Frame -> True, FrameLabel -> {x, y}, PlotLabel -> 2 Sin[x], LabelStyle -> Orange] But then add ...

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