3
votes
3answers
303 views

How to pull scalars out of a function that should act on lists?

Suppose I have A = a vecA B = b vecB where a and b are supposed to be arbitrary scalars ...
3
votes
1answer
501 views

Don't simplify an expression

I have an expression that I want Mathematica to fully expand without any simplification afterwards. I want the output to look like the following example. ...
3
votes
1answer
1k views

Improving NDSolve speed for heavily stiff problems

Having looked around the intergoogles and Mathematica.SE, I thought I'd pose a question with a minimum working example. Here is the situation I am trying to improve: I am solving a 4th order non ...
3
votes
1answer
218 views

How to partition MatrixPlot graphics?

Is there an easy approach - hopefully built-in - to partitioning MatrixPlot graphics into rows or columns (or both) of graphics sharing the same underlying options? ...
3
votes
4answers
523 views

Faster code for specific problem

Sorry, but I need the following code much faster and I'm running out of ideas. I do appreciate any help. I post two of my fastest ideas (tab and mat), although they are not really fast. Thanks in ...
3
votes
2answers
246 views

LetL and Module efficiency

I was recently introduced to the LetL macro thanks to Leonid's answer to one of my prior questions. I was, needless to say, impressed by the simplicity of its ...
3
votes
1answer
332 views

Problem in RegionPlot3D

I tried to plot the region bounded by the three planes. This is supposed to give me a pyramid type of shape (actually two, but I am just taking one of them). The code is given by ...
3
votes
1answer
396 views

wrong use of _?NumberQ?

I am having trouble with a numerical exercise. Here's a simplified version of my problem. I define two functions to find the solution to two constrained maximization problems: ...
3
votes
2answers
507 views

Precision of number not maintained when saved via Export

Assume that the output of my calculation is a and is a number such as: a = 100.1252135246354847; ...
3
votes
1answer
492 views

Mathematica PDF import and fonts

I am trying to put nice LaTeX labels on my Mathematica plots. I can do this manually, or by introducing an extra GNUPlot step into my workflow, but it would streamline the process considerably if ...
3
votes
1answer
255 views

Could the PrecisionGoal for NDSolve be a negative number?

The help of Mathematica doesn't say so much about the PrecisionGoal for NDSolve, and I never considered much about it even after ...
3
votes
2answers
261 views
3
votes
1answer
397 views

Randomly selecting elements without repetition

I assigned energy values to each element in the array as per the program of Verbeia. The program looks like this ...
3
votes
3answers
501 views

How can I change the CDF which imports the data and uses it, without execution of code

I am making an application which first imports the data from the Excel file and then uses it in the deployment of a CDF. But is it possible to change the data of the Excel file and see its ...
3
votes
1answer
602 views

MathLink compile errors

Don't you just love it when your computer is working fine, you work with some good examples, everything is wonderful and your relationship with your computer is the best? I do. But what happens when ...
3
votes
1answer
219 views

SetOptions or other approach to imposing default styling of text in a BarChart Legend?

Gustavo Delfino's answer to an earlier question showed that it is possible to use the third argument to Placed to format text in a ...
3
votes
3answers
381 views

Animate a position change along the curve for every iteration

I've only had few previous experiences on Mathematica before. So basically an entry-level question that harasses a rookie like me. I made the following attempt using bisection method to calculate ...
3
votes
5answers
504 views

How to use summation to get the value of a binary number?

How to use summation to get the value of a binary number? I want to do this: $(x_{n}x_{n-1}...x_{0})=\sum_{i=0}^{n}x_{i}\cdot b^{i} $ But it seems that I can only do something like this: ...
3
votes
2answers
170 views

How to check which file is older

Is there a command in Mathematica to check the date when a file was last modified? Suppose I have two notebooks: File1.nb and ...
3
votes
3answers
330 views

Support for Compressed Sparse Column sparse matrix representation

Is there native support for Compressed Sparse Column (CSC) format for sparse matrices, like importing and manipulating them?
3
votes
2answers
2k views

Plot CSV-data; make statistical statements in Mathematica / WA

First, I'm quite new to Mathematica so sorry in advance if some questions seem to be trivial. I have a CSV-file which looks like this: ...
3
votes
3answers
761 views

How to replace all occurrences of an element in a list?

Consider the following: list={1,2,2,2,3}; I would like to replace all 2 with the string "Test". ...
3
votes
1answer
248 views

FunctionInterpolation Errors / Question re Evaluation Order and Options

I have using Mathematica functions that takes a Cartesian coordinate relative to the Earth (xyz) and converts it to a latitude, longitude, and altitude (lla). And here it is: ...
3
votes
1answer
451 views

Custom setting of HOME and END keys on mac

Is there a way to set the HOME and END keys on a Mac's keyboard to jump the cursor to the line's beginning and end respectively? ...
3
votes
1answer
383 views

Solving an ODE numerically

I really appreciate it if anyone helps me with this: How can I solve this ODE and plot the answer for $x$ on $[0.6,5]$: $$ \begin{align*} -2xy'[x] = y''[x]+ 47.21 (-.0025 x^6 & + ...
3
votes
0answers
93 views

How do I direct output to a specific notebook or cell? [duplicate]

Possible Duplicate: How to pipe a stream to another notebook? Is there any way to create a stream so that all output to the stream (from Write or ...
3
votes
3answers
317 views

Retrieving PlotRange form BarChart

Consider the following data: data1={73.9377, 54.4122, 53.0826, 24.1936}; data2={76.828, 49.1673, 45.7883, 18.9015}; I defined my own BarChart as follows: ...
3
votes
2answers
338 views

Can SetDelayed (:=) be compiled?

Is it possible to put an If statement as below within a compile (see below)? I received a warning about SetDelayed. ...
3
votes
1answer
325 views

Explanation on why Compile statement works only if input and output sizes work

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 ...
3
votes
3answers
819 views

Changing variables algebraically

Suppose one has two functions, $y(x)$ and $z(x)$, and one seeks to obtain $y(z)$ by substituting $x(z)$ into $y(x)$. Can this be done in a single step? Or must $z(x)$ first be inverted independently? ...
3
votes
2answers
378 views

Local variables

I'm trying to use Modules together with functions. tmp2 = x^2 + 1; f[y_] := Module[{x = 1}, Evaluate[y tmp2]] This works when ...
3
votes
1answer
205 views

Avoid crash in recursive Dynamic

With the following Dynamic cell, I can reproducibly crash Mathematica, so do not try this unless you have saved all your work! ...
3
votes
1answer
762 views

How to write a function to add edges or vertex to a graph

I need to add either a vertex or an edge to a graph, and also sometimes, vertices or edges, or a mixture of the two. How to write a function for this?
3
votes
4answers
258 views

What is the most efficient way to save a big graphic?

I want to generate a graphic using DiscretePlot[primePercent[x], {x, 10^10}, ImageSize -> Full, Filling -> None, Joined -> True] where ...
2
votes
0answers
88 views

Power::infy: error using FindFit

I have a 2D data to fit (the Airy type pattern from diffraction of Gaussian beam on the circular aperture). Please see the attached picture. I was going to use a function like ...
2
votes
1answer
77 views

Multiple plots using dynamics

I am studying Dynamic and DynamicModule, and I have tried to make a simple plot of a family of real functions. The number of functions should be a dynamic variable controlled by a slider. So I have ...
2
votes
1answer
89 views

Plotting in projective space

I am having difficulty figuring out how to plot to projective space. Suppose I have a region which I have plotted such as: ...
2
votes
1answer
81 views

How to draw a normalized tangent arrow [closed]

I want to draw a normalized tangent arrow, so I use the Normalize command as follows: ...
2
votes
2answers
116 views

How do I exclude the vertical line plotted at a discontinuity?

Condsider function = Tan[1 x] + Tan[2 x] Plot[function, {x, 0, 1.5}] It has a strong discontinuity around 0.8. The problem is , if I want to find ...
2
votes
1answer
95 views

How to input and output partitioned matrices that show partitions and compute as normal?

I want to demonstrate multiplication of partitioned matrices as in the example here. Using the Insert Menu, you can build a matrix and draw lines between rows and columns. However, I want to be able ...
2
votes
0answers
43 views

DSolve breaks when the ordering of independent variables aren't proper?

I encountered this when trying to solve this problem with DSolve: ...
2
votes
2answers
52 views

Order of Evaluate for Map

I would like to get a list of variable names as strings. For example, x = 1; y = 2; Map[SymbolName, Unevaluated /@ Unevaluated@{x, y}] {"x", "y"} This works ...
2
votes
0answers
74 views

Excluding region with `RegionDifference`

I can't make RegionDifference work for two Rectangle: ...
2
votes
1answer
120 views

How to draw timing diagram from a 0 and 1 string list (2)

I like ubpdqn's last edition & Mr Wizard's refactoring to my last question very much. I inserted two Reverse just to make the diagrams and the strings match in ...
2
votes
0answers
215 views

Dataset Mathematica 10.0

I started to use the new funcationality 'Dataset'in Mathematica 10.0. ...
2
votes
1answer
95 views

Error when attempting to save Notebook. Cause and solution?

I am experiencing an error attempting to save a modified Notebook in Mathematica 10 under Windows. The error I get is: ...
2
votes
1answer
49 views

Having variables appear aqua in user defined function [duplicate]

In many of the inbuilt mathematica function, variables appear aqua like in: However, when creating your own function, variables no longer have that green coloring and are instead colored like an ...
2
votes
1answer
81 views

How does one get Mesh lines at 0 in ParametricPlot3D?

The following is in the documentation (MMA 10) under ParametricPlot3D -> Options -> Mesh : ...
2
votes
1answer
42 views

Is the use of Block to temporarily override definitions inherently unsafe? [duplicate]

This may have been discussed before, if so, please let me know. Consider the following example: x = 5 Dynamic[{Clock[], x}] This will always display the ...
2
votes
0answers
313 views

Mathematica 10 trial limitations [closed]

I just installed the mathematica 10 trial on OS X Mavericks. Everything seems to be working fine, except that I cannot use Export or any kind of functions involving ...

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