8
votes
3answers
1k views

Plotting a 2D shape along a 3D parametric function curve

Say I have a 3D curve that is parametrically defined. How would I be able to plot shapes like figure 8's whose centers are aligned along the 3D curve? Say the curve was: ...
8
votes
1answer
775 views

What does ` symbol in ClearAll[“Global`*”] mean?

I have found an example for clearing all symbol definition by: ClearAll["Global`*"] But what does the symbol ` mean? It isn't the apostrophe ', yet it is not ...
8
votes
1answer
1k views

Quality control when exporting graphics into JPG

If I export a graphics from Mathematica to JPG format the image quality in JPG is visibly lower than that in Mathematica. Is it possible to control and eventually increase the quality of the exported ...
8
votes
5answers
2k views

How to enter textual subscripts and superscripts?

When I add a sub- or superscript to a letter in a "Text" cell using the "Writing Assistant" palette this letter becomes Italic: ...
8
votes
1answer
1k views

How to avoid font substitution with Mathematica fonts?

When I export a Plot to PDF, a journal publisher complains that they do not have the Mathematica fonts. I believe there is a way ...
8
votes
4answers
835 views

How can I highlight the points lying between two lines in a ListPlot?

I have a list of numbers like the following: list = Table[RandomInteger[1000], {i, 1000}]; And I plot them so: ...
8
votes
2answers
874 views

a problem about simplifing conjugate

the situation is as follows ...
8
votes
2answers
375 views

find subsequences of constant increase

A list like l = {0, 1, 2, 3, 4, 5, 7, 9, 12, 13, 18, 19} may have subsequences of constant increase, $a_{n+1} = a_n + k$. For example: ...
8
votes
1answer
686 views

Using Partition to allow sublists of different lengths

As a minimal example, suppose I have a list of the integers from 1 to 25. Suppose I want to use Partition to partition the list into sublists of length 10 but ...
8
votes
1answer
287 views

LocatorPane, selecting multiple Locators

Consider the following snippet ...
7
votes
1answer
579 views

Calculation of 2D FFT for an image

I am trying to obtain 2D FFT of an image. From the 2D FFT, I wish to calculate the amplitude of the FFT averaged over a circle vs the distance in pixels by varying the radius of the pixels which is ...
7
votes
4answers
219 views

Create Nested List from tabular data

Im trying to create a nested list from tabular data, then onward into a nested association. I can get part way with the help of this answer but it only works for the first level. Repeated use of this ...
7
votes
2answers
234 views

Cutting away points that are not resonances

My situation is as follows. I have a whole bunch of data that I need to fit, which tends to look like this picture: As can be seen, there's three dips (resonances) and a whole bunch of noise around ...
7
votes
3answers
162 views

Unknown function with arbitrary arguments assumption

Is it possible to define an assumption like this: $Assumptions=f[__]>0 So that: ...
7
votes
3answers
656 views

Normal // Association // Dataset workaround for some user query operators

Given example tabular data (ie, with rows and columns, or "data frames") ...
7
votes
2answers
227 views

How to correct this, `f[a_] := FindRoot[eq == 0, {x, 0.5}]`, where `eq` contains a parameter $a$, without using `eq[a]`?

I want to solve an equation with a parameter $a$, and define the result as a function of $a$. It is something like this: ...
7
votes
1answer
2k views

How to set the working precision globally? $MinPrecision does not work

I want to increase the precision globally to 50 at least, but $MinPrecision does not work. ...
7
votes
1answer
402 views

Combining graphics

Original question I would like to put a coloured grid behind the following plot: which was generated by: ...
7
votes
3answers
1k views

How to connect Mathematica 9 to MS SQL 2012 using Windows 7 enterprise (64-bit)

I have used Microsoft Open Database Connectivity (ODBC) with Mathematica 8.0 and MSSQL 2008 on Windows XP, but I can't get it to work on Windows 7 Enterprise (64-bit) with Mathematica 9.0.1.0 and MS ...
7
votes
6answers
3k views

Series expansion in terms of Hermite polynomials

I am trying to expand a polynomial in terms of orthogonal polynomials (in my case, Hermite). Maple has a nice built-in function for this, ChangeBasis. Is there a ...
7
votes
2answers
312 views

Is there something akin to “SubgraphIsomorphismQ” in Mathematica 9?

Provided two unlabeled graphs, $G$ and $H$, I would like to test where $H$ is a subgraph of $G$. In other words, I'd like to test whether we can prune some fixed number of vertices or edges from $G$ ...
7
votes
4answers
1k views

Obtaining better quality in ListPlot

I have a data file which can be downloaded from here. In order to plot this, I use the following Mathematica code ...
7
votes
4answers
498 views

How to batch rename a directory of files?

I have a directory of files with the pattern: "some_number.some_name.pdf" I want to remove the "some_number." part from all the ...
7
votes
2answers
238 views

How can I get information about properties of a style?

I'd like to make some features of my notebooks responsive to some properties of styles in the active stylesheet. Is there a way to do this? I can't seem to get anything out of ...
7
votes
1answer
430 views

Control parameters of different styles of DistributionChart

Using DistributionChart, you can choose among several styles aka ChartElementFunction: ...
7
votes
3answers
3k views

How to use results of NDsolve[] for further solving of ODEs?

I have a system of ODEs with 10 eqns. I can solve the first 5 independently. How can I use those results to solve for the remaining 5? An easy example would be $\dot{x}=f(x), \quad \dot{y}=g(x,y)$ ...
7
votes
2answers
1k views

Is it possible to export a graph as graphic to Excel?

It is straightforward to export lists to Excel with Export. Can I export a graphic image, too? This does not work: ...
7
votes
1answer
350 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 ...
7
votes
3answers
247 views

Pattern matching Q for rectangular data matrices

Given a List of rectangular nx3 arrays of data, each of the form {...,{x,y,z},...}, (the ellipses are not Mathematica pattern syntax, just for illustration). Some members of this list may be - by ...
7
votes
4answers
537 views

Attaching persistent assumptions to symbol definition

Is it possible to attach assumptions to a symbol? This relates to this question. Most of my work involves physical equations, i.e. there are basic assumptions on variables that will always hold true ...
7
votes
1answer
255 views

Can the Notation function support complex structures on its left hand side?

In my investigation of the possibilities offered by the Notation package, I came over a limitation in the complexity of the left hand side symbol. For instance, although I am able to enter ...
6
votes
1answer
488 views

Lagrange Multiplier

We are asked to maximize and minimize $f(x,y)=4xy$, given the constraint $4x^2+y^2=8$, using the Lagrange Multiplier method. First, I enter the functions f and g. ...
6
votes
1answer
374 views

How to combine Plot and GeoGraphics?

I want to combine this map as "background" of this combined plot. How can I do it? The documentation doesn't show any similar demonstration. ...
6
votes
4answers
332 views

Is there a more Mathematica-y way to label these plots?

I am studying an infinite square well in the context of quantum mechanics. ...
6
votes
3answers
4k views

Position of axes labels

I have a 2D parametric plot like the following: ...
6
votes
1answer
1k views

Trace of FullSimplify

I have a symbolic function and I used FullSimplify command to simplify the equation given below. I am calculating it by hand but I couldn't reach the same solution. ...
6
votes
3answers
765 views

Find the position of a string element, knowing only part of the string

I have a list, e.g.: list = {1, 2, 3, "Element 1", 4, 5, "Element 2", "Something else 1", "etcetera"} Now, I want all elements starting with ...
6
votes
2answers
2k views

How can I superimpose a set of points on a ContourPlot?

I am familiar with Mathematica to a certain extent, but its subtleties still elude me. Currently I am trying to solve the following problem: The function $f(x,y)$ is continuous. I know how to create ...
6
votes
2answers
2k views

Exporting interpolating functions to excel

I have a question about exporting an InterpolatingFunction to excel. I checked the forum, but I still couldn't completely understand how to solve my problem. Could someone help me with this problem? ...
6
votes
1answer
640 views

Simplistic Notation example

Notation package looks poorly documented. For example, GridBoxDividers option is not documented at all. Can someone give me a simplistic example of a Notation set ...
6
votes
1answer
247 views

How to create a “standard” CDF programmatically?

How can I programmatically create a CDF which is similar to the CDFs created by File -> CDF Export -> Standalone...? ...
6
votes
2answers
1k views

Nested Map and Apply

There are some other questions on this topic but I could not get an answer from reading them. What I want to do is use Apply on some of the arguments of a function, ...
6
votes
1answer
551 views

Using more than one set of Locators in a Manipulate

I need to add locators dynamically to different sets. With one set this works OK: ...
6
votes
2answers
487 views

Plotting All Possible Points Belonging to a Group Orbit

Given that $$X = \{(x,y,z) \in \mathbb{R}^3 |\, x^2 + y^2 + z^2 - 2(xy + xz + yz) = k\}\,,$$ where $k$ is a constant. Also given that a group $G$ is represented by $$\langle g_1,g_2,g_3|\, g_1^2 = ...
6
votes
1answer
1k views

Construct a simple mesh or tetrahedral mesh from 3D image surface

I have a 3D Y-Shape hollow tube, not so good surface. Import["http://dl.dropbox.com/u/68983831/tube02.vtk", "Graphics3D"] I tried to use following vertex data ...
5
votes
2answers
828 views

Solve wave equation using DSolve?

The wave equation with pined-pined boundary has well-known solutions, but directly input the equation into Mathematica does not return them. $$EI\cfrac{\partial^4 w}{\partial x^4} + ...
5
votes
1answer
217 views

Trace one point's coordinate values in sequentially images

I am a research student in a university. I think I need some help. I used a video camera to monitor the vibration of a plank. Then I should calculate the amplitude and frequency of the vibration ...
5
votes
3answers
302 views

SQL-like computation on Dataset: Aggregate function

Assume that I have this dataset a = Dataset[{<|"A" -> "A1", "B" -> 2|>, <|"A" -> "A1", "B" -> 3|>}] How can I get the total of Key["B"] ...
5
votes
1answer
337 views

How can I create an interactive ColorFunction using Manipulate?

I am trying to specify my own colors and scaling for the ColorFunction in ListDensityPlot. I have several lists of 2D values ...
5
votes
1answer
230 views

Watch File in Directory .NET

How might I watch for a specific file to change in a directory using Mathematica/.NET code? The following works in .NET but fires twice when you change the file. ...

15 30 50 per page