4
votes
2answers
115 views

SetterBar divider style in Manipulate on a Mac

MMA 9.0.1 MacOSX "Mavericks". This issue is apparently mac specific. The issue of this post is illustrated here, for example. In a SetterBar control straight out ...
0
votes
1answer
88 views

Trouble fitting an explicitly complex model with the TransformedFit package

This is follow up from a previous question in which @Oleksandr R. suggested the use of a package he developed for splitting a model and data into real and imaginary parts to avoid a problem with ...
4
votes
3answers
417 views

How to use the same colors in Epilog and Plot

How can you use the same colour to the data in Epilog as the data in the ListLinePlot? I am plotting 25 lists (4 in this ...
0
votes
2answers
1k views

How to put x-Label below the x-Axis? [duplicate]

How to put label "Iterations" below x-axis? Possibly in an easy way without multiple commands. ...
0
votes
1answer
343 views

How to plot a region bounded by three equations?

I'm very new to this website. I am having trouble plotting a 3 dimensional region bounded by these equations: ...
0
votes
2answers
170 views

adding a 1 to all second elements

I want to add 1 to all second elements but I am running into a "level" problem I believe here is my code: ...
1
vote
1answer
104 views

Styling differences between CDF in CDF player and in MMA

I've used the ConfidentialReport stylesheet for a CDF document. When I edit the CDF within MMA a Paragraph Item appears with an opener as follows: but when the document is opened in the Player ...
3
votes
3answers
215 views

Combining two plots with inverted xy-axes

I need to draw a set of curves on one graph (characteristics equations). As you can see they have exchanged x and y axes. My goal is to plot all those curves on one graph. Are there ways to do that? ...
0
votes
1answer
530 views

Generating all “from n choose k” configurations of a simple list [duplicate]

Suppose that I have a 1-D list called myList. Here's an example: myList = {"A", "B", "C", "D"}; I want to write (or find ...
1
vote
1answer
143 views

How to compile a function whose arguments are lists containing strings?

I'm unsuccessfully trying to compile this function check[argA_, argB_] := argA[[1]] == argB[[1]]; assuming that both arguments argA and argB are of the form ...
2
votes
1answer
170 views

Text analysis and loops

I need a loop for a text analysis involving about 1000 papers (identical structure of all papers) I have these two commands to read all the papers into memory. ...
1
vote
0answers
32 views

How to Plot a function that returns multiple values? [duplicate]

I have a function that returns multiple values, like this: f[x_] := ( (*... something ... *); {y1, y2}); They are computed together, so there's absolutely no ...
11
votes
2answers
2k views

Is it possible to create iOS apps with Mathematica?

I am fairly new to Mathematica and don't have much experience with other programming languages, but I can already see that Mathematica and the Wolfram language are far easier to use than most others. ...
4
votes
4answers
138 views

Subtracting list from list of same dimensions [duplicate]

This might seem like a basic operation I have already searched for similar answers but found none. I want to subtract the second elements of my list ct from the corresponding element in lt, and ...
0
votes
1answer
34 views

How to use more/less black textcolor in function of the value of numbers in a table?

A few weeks ago, I viewed in the Mathematica Documentation any page withmultiple examples using diferent styles dpending on the value of the number in position (i,j), but I can´t remember... and I ...
0
votes
1answer
93 views

How could I expand this equation

How could I expand this equation (0.837 + x^0.5 + x)^4.870 Neither Expand[(0.837 + x^0.5 + x)^4.870] nor ...
1
vote
2answers
152 views

Why does Mathematica not replace the derivative of $theta$1'[t]?

I want to know the velocity of point $p$, given that I know the coordinate. $p_x=L_1\cos(\theta1)+L_2\cos(\theta1+\theta2)$ I calculate $\frac{dp_x}{dt}$ to achieve the velocity of point $p$ about ...
1
vote
3answers
3k views

How to export data to a plain text file?

I am preparing data used by a command line program. It requires data in a simpliest possible format: value_x1 value_y1 value_x2 value_y2 ... value_xN value_yN ...
2
votes
1answer
90 views

Is it possible to auto-load documentation for current function? [duplicate]

As much as Mathematica amazes me with endless variety of integrated functions and packages, inconsistency with functions parameters or finding details about a function takes some time and isn't as ...
7
votes
3answers
323 views

Transforming a mutiplication into an addition

How can I force Mathematica to transform 5a into a+a+a+a+a
4
votes
1answer
197 views

On elegant use of Inner and Outer on tensors

I have a collection of 5-element vectors each of which corresponds to an {x,y} location from a (20 x 21) grid. Because of that I represent that data as a (5 x 20 x 21)-sized tensor called ...
0
votes
2answers
58 views

Evaluate differentiation after replacement

The problem is Find two linearly independent solutions of $2x^2y'' -xy' + (-4 x + 1)y = 0, \, x>0$ of the form $y_1 = x^{r_1}(1 + a_1 x + a_2 x^2 + a_3 x^3 + \cdots)$ and $y_2 = x^{r_2}(1 + b_1 x ...
2
votes
2answers
987 views

Get positions of all non zero matrix elements

I want to find all non zero elements of a table and I want to create a list that contains the name of the table the element was removed from, the position of the element, and the value of the element. ...
20
votes
2answers
654 views

List of atomic expressions

I was surprised to see Graph objects are atomic. Is there a way (through documentation or programmatically) to find all atomic heads? The ones I know of are: ...
3
votes
1answer
125 views

Problem with PlanarGraphPlot And ConvexHull

I'm getting a lot of strange errors when using PlanarGraphPlot with a simple list of 11 points. This is using Mma 9.0.1 64-bit Mac OS X. ...
5
votes
2answers
551 views

Real and/or improved CForm of expressions

I'd quite like to be able to automatically generate C++ versions of certain mathematical expressions that I've manipulated in Mathematica. The resultant C++ code fragment is then going to be used ...
1
vote
1answer
63 views

Displaying an open Manipulator

Take something like: Manipulate[N[Pi]*s, {{s, 5}, 0, 10}] This results in the following: What I would really like is the following: Is there any way to ...
6
votes
3answers
321 views

Accumulate second elements in sublist

I want to accumulate the second elements in each sublist identified by its first element. ...
4
votes
1answer
153 views

References on functions FindGraphPartition and FindGraphCommunties

Does somebody have some interesting references on the FindGraphPartition and FindGraphCommunties[.., Method -> "Spectral"] ...
1
vote
1answer
79 views

Turning Off Error messages locally

I'm trying to turn Off an error in an expression. ...
3
votes
1answer
194 views

Dynamic inside Button

This bit of code runs a little animation of a stochastic process: ...
7
votes
0answers
515 views

Modelling Hysteresis with a Differential Equation

I want to implement the bulk ferromagnetic hysteresis model (mostly the Jiles-Atherton Model), see http://drum.lib.umd.edu/bitstream/1903/6043/1/PhD_99-1.pdf page 44 equation (30). The needed ...
0
votes
1answer
153 views

Rotating & Trimming grids

I want to draw a graphic $20\times20$ grid, rotate it by $\theta$ around $(0,0)$, and trim off the part on the right of the y-axis, so I came up with ...
1
vote
0answers
227 views

InstallJava::fail error when importing an image with a Raspberry Pi

I'm trying to import an image in Mathematica on my Raspberry Pi. The code is simple but I get an error when importing: ...
17
votes
6answers
822 views

Historical Exchange Rates via FinancialData

FinancialData["name"] and FinancialData["name", start] return respectively; the last known price, and the daily closing values ...
3
votes
2answers
298 views

Expectation of a family of random variables

I did some search here, but seems that no one asked about this. I want to define a family of independent and identically distributed random variables, $x_1,...,x_n$, and then calculates the expected ...
6
votes
1answer
149 views

Garbage collection for memoized functions on subkernels

I have a top-level function which operates on some data: findBestIntegers[data_]:=ParallelMap[optimize,data] which makes parallelized calls to an optimization ...
10
votes
1answer
358 views

Full documentation for AppearanceElements

As explained in this solution, ListAnimate[Table[Plot[Sin[n x], {x, 0, 2}], {n, 3}]]//InputForm will allow me to view the types of appearance element for the ...
0
votes
1answer
84 views

TeXForm without simplification

I'd like to be able to feed an expression into Mathematica, and have Mathematica convert that expression to TeXForm WITHOUT ANY SIMPLIFICATION WHATSOEVER. As a trivial example, currently, if I enter ...
2
votes
0answers
69 views

Complicated output from simple Eigenvalues problem

I have code that uses Eigenvalues on matrices of various sizes. But the output of what should be a very simple problem, namely finding the eigenvalue of a 1x1 matrix, is overly complicated. ...
-2
votes
1answer
205 views

How to solve a non-linear equation?

I am trying to solve the following non-linear equation: $\frac{i e^{-x^2} \sqrt{\pi } x}{K^2}+\left(-0.131251-0.0379031 x^2-0.0151154 x^4-0.0100462 x^6+0.5 \left(0.00273859 +0.0400003 K^2\right) ...
0
votes
1answer
95 views

Blank plot that shows up briefly when changing plot options

I wrote some code in Mathematica to calculate and plot, in tw0 different ways, a function depending of two variables. But the plots are empty even if it takes a few minutes to evaluate the plot ...
0
votes
1answer
686 views

Solving a large system of non-linear equations

I am new to Mathematica, and I am currently trying to use it to solve a large symbolic system of non-linear equations. I began the code below about 30 hrs ago, and the Mathematica Kernal has been ...
4
votes
1answer
111 views

Pattern matching and HoldForm

Create rules based on data. I have a system that picks out on date,based on some rules. I then want to generate a new rule based on this date and apply the rule to a new dataset. ...
2
votes
1answer
99 views

What is the proper way to the pattern form Repeated in my code?

I'm matching a pattern with Repeated (..) How can I use the repeat count in the replacement rule? Example: ...
2
votes
1answer
550 views

Truncate High order terms

Suppose I want to compute this : Series[Sin[1/f], {f, Infinity, 10}] but finally I prefer Sin[1/f] up to the fourth order in ...
0
votes
2answers
178 views

Fraction of fibers that have failed

I have the following to set into mathematica. Assume a stress(sigma) applied on a specimen which has a number of fibers within it. All fibers that have a strength less than the applied stress should ...
2
votes
1answer
139 views

Histogram scale error when using DistributionChart

I'm a novice Mathematica user that is having some problems using the HistogramDensity function in a DistributionChart. My observations are heavily skewed to one category and the height of the other ...
7
votes
2answers
1k views

Solving the Helmholtz equation in polar coordinates

I'm trying to (as a simple starter) find the solution to Helmholtz equation in polar coordinates -- I already know what it is and can derive it by hand, but just want to start here before asking ...
14
votes
1answer
4k views

How to request financial data from Yahoo's YQL and Quandl?

How can I download historical data from Yahoo ? Although Mathematica's FinancialData function uses Yahoo it could be useful to have more control on how to retrieve data from Yahoo's YQL. Edit ...

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