# All Questions

3k views

### How to create a list of pairs from 1d list(s)?

Say I've got two 1-dimensional lists A = {1,2,3} B = {a,b,c} How do I create a list of all pairs from list A such that the ...
1k views

### How to convert binary float to decimal float

I need to convert binary float to decimal float in Mathematica, ideally between any two bases. FromDigits["1.111111", 2] does not work.
6k views

### Legend of a plot: how to increase the size of the line/marker?

I'm using the following kind of code to do the legends of my plots: ...
948 views

### DeleteCases on list of Strings

Consider the following: data={"AB","CD","AF"}; Now I would like to delete all String from data which starts with "A". ...
278 views

### How to make an unremovable modal window?

Is there any way to securely stick a notebook window (e.g. a dialog) on screen that it cannot be closed/removed/hidden by any of the standard OS shortcuts, like AltF4 or AltTab under Windows? The ...
462 views

### Symmetric difference of a sample of lists

Consider the following: list1={a,b,c,d}; list2={c,d,e,f}; list3={g,d,c,h}; Now I would like to get the symmetric difference. Hence, the result must be ...
966 views

While answering this question, I tried TextRecognize to read single digits. But it doesn't recognize a single digit, even though the digits are clearly readable. ...
229 views

### Create a CDF file with a plot that cannot be edited by double-clicking

I have created a CDF file that contains a Manipulate object with a plot. I intend to embed the file in a web site, so that users can use interactive sliders to ...
668 views

### Efficiently deleting rows in many large text files

I have 500 text files each of about 200000 rows. I need to delete one row in each of them as fast as possible (later such operations will repeat). What is the best way to do this with Mathematica? ...
11k views

### Is there an open source implementation of Mathematica-the-language?

I've seen questions before such as "What is the best open-source equivalent for Mathematica?", but that specific question (and that line of inquiry in general) cares more about the computer algebra ...
2k views

### Is it possible to use Mathematica to record sound and/or vision?

I think the title says it all. I know about ImageCapture which seems to capture stills. Can ImageCapture be made to capture a ...
17k views

### Labeling individual curves in Mathematica

I need to create a plot for export and inclusion in a report. Is there a better way to label curves than PlotLegends? From what I've read and my personal ...
433 views

### Custom distance metric for agglomerative clustering in Mathematica

Is it possible to have a custom distance metric defined to determine the distance between two clusters in Agglomerative clustering in Mathematica? I have a 3 dimension data with string values along ...
667 views

### Computing the distance between two curves obtained from image data?

I've got some image data that I've binarized. The image contains two curves, from which I'd like to compute the distance between (eventually computing an average radius for each point in the ...
208 views

### MatchQ and patterns for similar lists

I can't seem to find the right set of patterns to independently match two different lists. Simplified versions of the lists are as follows: ...
570 views

### Shading in squares crossed by a diagonal

You have a rectangle and it is diagonal. How many squares will be crossed by the diagonal (I guess assuming the side length of the rectangle are nice whole numbers) I've seen an implementation in ...
3k views

### Why doesn't Mathematica expand Cos[x]^3 Sin[x]^2?

I found some examples of Mathematica's commands usage in an old manual but the program gives me different result than expected ...
337 views

### How do I define the “Coupon” within the function FinancialBond with a time-varying coupon

Is it possible using FinancialBond function to calculate the yield of a bond paying a gradual coupon ? An example : A bond with maturity of 7 years pays ...
338 views

### Interpreting text entry and splitting it in a Manipulate text field?

I have the following program that plots the number of trigram appearances across a corpus of textual information between 1964 and 1989 (apologies for the messy code): ...
508 views

### Is there a way to print out SQL queries made using DatabaseLink?

I have a Mathematica batch script which makes some MySQL queries using DatabaseLink to store parameters of the run in a database. Recently, I had a run where these queries failed, and there was no ...
1k views

### Using the Krylov method for Solve: Speeding up a SparseArray calculation

I'm trying to implement this Total Variation Regularized Numerical Differentiation (TVDiff) code in MMA (which I found through this SO answer): essentially I want to differentiate noisy data. The full ...
141 views

### Question about scoping data in a multi-level Manipulate construction

Background: In a module containing an outer / inner manipulate I select the key of data with a dropdownlist in the outer manipulate. Data is read and displayed in the inner manipulate for edit ...
617 views

### How can I influence the spaces between labels on a BarChart

I want to chart data using a BarChart, the labels on the x-axis are numbers. Unfortunately they are so close to each other it really looks strange and more like one ...
142 views

### tol and None in output of CompilePrint

A bit of background: I'm trying to fit a very complicated symbolic function. By compiling the function I got about 100x speedup, but I would need another 10. Therefore I'm trying to understand if the ...
3k views

### How can I connect to a database using the 32 Bit ODBC on a Windows 7 (64 Bit) machine?

I am having difficulties using a DSN that was defined in the 32 Bit version of the ODBC-manager? (there are two separate managers for 32/64 Bit on a 64 Bit machine) Using the DatabaseLink package ...
452 views

### Strange domain dependency with Maximize

I'm using Mathematica 8 and strangely enough this code: Maximize[{x*(1-0.01 x),x>0},x,Integers] produces the result ...
180 views

### BoxWhiskerChart too slow on big datasets, how to speed it up?

I have very big dataset, with over 14 000 000 records. And maybe more! Each record consists of Data ( Real ) and Time ( integer ). I group records by time interval, resulting in 300 groups. In each ...
477 views

### Finding a vector field from a set of points

I have a data set of the type $\{x,y,z\}$ where $(x,y)$ is a point and $z$ is the "value" or magnitude at that point. This gives me a triangular sort of shape since $(x,y,z)$ is not defined along the ...
362 views

### How can an InverseQuantile or an interval valued Quantile function be implemented in Mathematica?

Quantile[] is the workhorse method in robust data analysis and statistics (see, eg Koenker's Quantile Regression). However, it should be complemented by an ...
780 views

### Number of iterations in NSolve

In Excel's solver, one can define how many iterations are to be done, to one's liking. I am wondering if this is possible to do with NSolve in Mathematica? Code ...
283 views

### Threading behavior of SameQ vs Equals

I ran into a bug in my code today based on an errant assumption. Namely, I thought that: ...
517 views

How can I calculate only those permutations of Range[n], that satisfy certain rules? I don't want to filter the result after calculating all the permutations but ...
140 views

### Possible to draw an Item in a Grid with only 3 sides of a Frame?

I'm trying to draw a Grid of characters where some of the characters have Frame lines on 3 sides. For example: ...
4k views

### Coulomb potential as a Fourier transform

It is well known from theory that the Coulomb potential can be obtained as a Fourier transform in the following way:  \int \frac{\mathrm{d}^3p}{\left( 2 \pi \right)^3} \frac{e^{\mathrm{i} ...
193 views

### List-operations only when restrictions are fulfilled (Part 2)

Consider the following: data={{{3544128000, 80}, {3544732800, 80}, {3545337600, 80}, {3545942400, 80}, {3545942400, 160}, {3546547200, 160}, {3547152000, 0}}}; ...
885 views

### Why is ListDensityPlot unable to plot datasets with extreme ranges

Consider the following dataset: data = Flatten[ Table[{x 10^-9, y 10^-9, x^2 + y^2},{x, -100, 100, 10}, {y, -100,100, 10}] , 1]; If I try to ...
1k views

### Scale Insetted Characters to Plot

I am trying to place a curly brace within a plot such that the top/bottom of the curly brace line up with two horizontal lines in the plot: I have not been able to find a way to make the curly ...
94 views

### What exactly does AddTeX2Eps do and how does one use it?

What exactly is Janko Slavic's addon package AddTeX2Eps supposed to do, and exactly how does one get it to work? I do understand it's supposed to allow one to use TeX ...
368 views

### Transparent background of content in a dialog window

Why dialogs created with CreateDialog cannot correctly show content with transparent background? The following example generates a plot, with white background, ...
5k views

### How to insert graphics primitives into a plot?

I have a standard normal curve rendered with the following command: Plot[{1/Sqrt[2*Pi] Exp[-1/2*x^2]}, {x, -3, 3}, Filling -> Axis] It looks exactly as you ...
95 views

### How do Forms affect the interpretation of Expressions?

Below are three formats for representing an undirected edge between vertices a and b: ...
620 views

### Factorizing polynomials over fields other than $\mathbb{C}$

I'd like to take a polynomial in $\mathbb{Z}_5[x]$ of the form $ax^2+bx+c$ and factor it into irreducible polynomials. For example: Input... x^2+4 Output... ...
256 views

### How to solve issue with exporting / importing data to and from Excel

Background ( simplified ): When I export data to Excel like ...
77 views

### How can I get TracePrint to treat certain functions as atomic?

Consider the following example: ...
924 views

### Why plot returns empty in this example?

Let me rewrite this question, showing the original problem, as it is more subtle than the simple example I showed before using Sin[t]. Here we go again. When I ...
71 views

### Graph relationships between functions and variables [duplicate]

Possible Duplicate: Has anyone written any function to automatically build a dependency graph of an arbitrary Mathematica function? I need to make sense out of a huge notebook (17Kloc) ...
698 views

### Combining values in one column (or part) when values in another column (or part) match

Consider the following: ...
382 views

### Using ContourPlot3D on a region in $\mathbb{R}^3$

I have a fundamental region in $\mathbb{R}^3$ defined solely by inequalities (i.e. the region is the intersection of 5 half-spaces and is a kind of square pyramid), and a function which is only ...