1
vote
2answers
454 views

DSolve bvlim error due to Boundary condition at infinity

I am solving an Ode using Mathematica that has boundary condition at infinity which is why Mathematica is showing error message. Please help to tackle this problem. ...
2
votes
2answers
354 views

cycloid parametric [closed]

How do I enter 3 parametric equations for cycloids corresponding to circles with radii 1, 2, and 4. I have tried ...
2
votes
1answer
130 views

`Export` to `.eps` ruins the formatting of subfigures

As a result of this question an issue of Export emerged. I.e., when I set my .eps figures with ...
7
votes
1answer
151 views

How to export to .html .nb file together with links «in» and «out»

If use «File > Save As > HTML» links «in» and «out» are lost How to save a document without loss of these lines/links? UPD: You can write in the css rules (...
1
vote
1answer
62 views

Filtering out 'no solutions' after solving a high order polynomial

I am dealing with a fourth order polynomial. I get all of the desired out put however above a certain range I also get these - {}. From my understanding this means that there is no solution. I am ...
17
votes
1answer
721 views

How to work with characters from CJK Unified Ideographs Extension B correctly?

Background: Recently I'm trying to deal with some Chinese characters which belongs to the CJK Unified Ideographs Extension B block. The motive comes from some further interest following a former ...
7
votes
1answer
190 views

Momentary Checkbox

I'm trying to create a demonstration in Mathematica where a checkbox will show an answer, but I only want the answer to be shown while the mouse button is pressed. There seems to be a ...
16
votes
1answer
357 views

Why does this line increase the consumed memory?

Probably this is a simple question, however I really don't understand this behavior in Mathematica. It particularly leads to a memory leak in a huge program I have to do processing of 3D images. I ...
5
votes
1answer
109 views

How to implement kvo in Mathematica 10? [duplicate]

Key value coding and observing is something that other languages do well, like objective-c for instance. What's the best way to achieve something similar in Mathematica (if at all possible)? That is, ...
3
votes
3answers
287 views

String pattern defined by number of characters

I want to extract non-overlapping substrings from strings with only four possible characters a,b,c,d. These strings will always have equally many "a" and "d" characters. The substrings x I want satisy ...
1
vote
1answer
78 views

Different distance in .jpg plot and .eps

I noticed that when I run my code to draw a plot: ...
0
votes
2answers
115 views

Show legend on plot [duplicate]

I have a series of curve I'm plotting using ListPlot. For each plot I'm changing a variable called X. Is there anyway I could ...
1
vote
0answers
53 views

Simplifying an inequality inside an answer by parts

I have the following piece of code where I'm evaluating a probability of a variable v being greater than some threshold under a Uniform distribution. ...
0
votes
0answers
59 views

Symbol definition in parallel kernels

Suppose I have a reasonably large number of floating point arrays, obtained from prior numerical simulations. These are stored as binary files named data_#####.dat ...
0
votes
1answer
124 views

Count intersections of two non-polynomial functions [duplicate]

I have two Bessel functions, and I need to be able to count the number of intersections if both functions are plotted dependent upon the same variable. I can use FindRoot or FindInstance to get one ...
0
votes
0answers
223 views

plotting the stable and unstable manifolds of a difference equation

I have a 2D non-linear system of difference equations for variables x and y defined as follows: ...
1
vote
2answers
650 views

Fix the position of the axes label [duplicate]

How can I set the position of the axes labels (X,Y,Z), so that, among other things, they do not overlap with the numbers in the axes? Here an easy example: ...
2
votes
0answers
73 views
0
votes
1answer
138 views

How to find the Nth zero of a function

It's an almost same question with "a multiple roots finding" but, the order of roots is important in my case. Basically, I'm trying to find Nth crossing point of the following graph: ...
2
votes
1answer
92 views

Plot several columns of table with variable number of columns and display the legend accordingly

I use this command to plot all values from the 1st column of Table "results" against all values from the 2nd column: ListLinePlot[{results[[All, {1, 2}]]} Now, ...
0
votes
2answers
164 views

manipulating the X axis notation in mathematica graph [duplicate]

I plotted a graph in mathematica that displays the function M/1480 = (4*Pi*G*r)/(3c^2) R^3 here , ...
1
vote
0answers
47 views

Resolve not accepting equations involving factorial

If I take , Resolve[ForAll[x,x!>=0],Integers] True But if I make slight modification, ...
6
votes
1answer
106 views

Error messages from TensorContract and TensorReduce

I am struggling with a few errors when using symbolic tensors. I am using mathematica 9.0.1.0, linux x86. The following code generates what seems to me an incorrect tensor, this is the smallest ...
3
votes
1answer
171 views

Interpolation function rejected by ParametricPlot3D

I was playing around with the bouncing ball example, and decided to make a 3d version. I decided to use ParametricPlot3D for a simple independent 3D ...
1
vote
2answers
65 views

How to get the outermost command evaluated first?

I have an expression like ToString[Stuff[...]]. I plan on having the Stuff[...] be manipulated as a string according to the output of other parts of the program. The problem is that Mathematica tries ...
1
vote
1answer
220 views

For loops in Mathematica [duplicate]

I'm actually the first time using loops in Mathematica. For example, I have: For[i = 1, i <= n, i++, For[j = 1, j <= n, j++, ....] How it is possible now ...
2
votes
2answers
167 views

How to Map each cell in a matrix to another and solve the system?

tab1 = {{a1, a1 + a2}, {b1, b2*b2}} tab2 = {{2, 5}, {5, 2}} I want to map like this ...
29
votes
1answer
525 views

How to extract a list of available Method-s

The option Methodapplies for several functions, such as NDSolve, FindRoot, ...
0
votes
0answers
62 views

Transform NMinimze into LinearProgramming formulation

I have the following maximization problem that I currently try to solve with Minimize/NMinimize. Unfortunately, this kind of solution method takes really long for large systems of equations and ...
8
votes
1answer
250 views

Transformation rule on a list of non-negative integers

I am trying to create a transformation rule that takes a list of non-negative integer values of any length, finds a non-zero entry in the list, adds 1 to all preceding numbers, subtracts 1 from the ...
3
votes
1answer
167 views

Troubles with FindFit for ODE

I need to use FindFit for ODE with arbitary number of parameters. This code (from documentation) works: ...
15
votes
3answers
480 views

Grabbing a number of characters around a string pattern

If I have some string data: text = StringTake[ExampleData[{"Text", "DeclarationOfIndependence"}], 400] "When in the Course of human events, it becomes ...
6
votes
2answers
173 views

Using a held option

Woud there be an elegant way to use a held option ? For example if I need to pass by reference several variables but I don't always need all of them, it can be useful. For example if I want to append ...
6
votes
1answer
372 views

How to solve this probability symbolically or numerically?

I am trying to calculate the following probability $$\mathbb{P} \big(\sum_{i=1}^{m} (A_i + S_i) \le L < \sum_{i=1}^{m+1} (A_i + S_i) \big)$$ where, $$A_i \sim \exp(\lambda), \quad S_i \sim ...
4
votes
3answers
285 views

Polynomial with alternating sign coefficients from the odd degree terms of a Truncated Power Series

I'm trying to make a function that will take any truncated power series I give it, strip away all the even degree terms, then change the sign of the coefficients of every other term. So that we have a ...
1
vote
3answers
2k views

Tricks for solving (lots of) coupled nonlinear equations numerically?

I have a system of 6 non-linear (quadratic) coupled equations with 6 complex unknowns \begin{align*} |x_1|^2 + |x_2|^2 + |x_3|^2 &= a\\ x_1 x_4^* + x_3 x_5^* &= b + c i\\ x_1 ...
4
votes
2answers
193 views

GroupBy and MaximalBy to create a new Dataset

I'm looking for a neater way to achieve this, which to me looks awkward and suggests that I am missing something... Given a Dataset... ...
1
vote
2answers
186 views

How to create an effective PlotLegend when plotting many ListPlots?

I'm creating a ListPlot where I plot many data sets simultaneously. Currently, my code that produces it is something like this: ...
5
votes
1answer
192 views

How to get data from DB into dataset with keys

I'm a Mathematica newbie and I have the following problem: I connect to a Oracle DB and read out a set of variables, further on I want to histogram some of the variables. A Dataset seems to be the ...
0
votes
2answers
54 views

How to discern the different curves?

When we plot many curves, due to repeated colors it becomes difficult to discern that which curve belongs to which equation. For instance, ...
0
votes
1answer
67 views

definitions and usages of options such as “Count” ,”Area”, “ConvexCount”, and “ConvexArea”

I would like to use ComponentMeasurements to do image analysis on porus materials. However definitions andusages of options such as “Count” ,”Area”, “ConvexCount”, and “ConvexArea” are not well ...
6
votes
1answer
2k views

Automatic recovery after crash

I want Mathematica to periodically autosave my notebooks to the temp folder. And in case of front-end crash i want to see the dialog after restart with the following choices: recover from autosaved ...
23
votes
7answers
830 views

Alternative ways to implement a triangular recursion

Triangular recursions are a class of algorithms that frequently turn up in computational mathematics. These recursions are expressible in the general form ...
0
votes
1answer
127 views

Fitting data with inclusion of constraints

How do I find a fit for the dataS (see below) with the constraint that the parameter np is an integer, and that the parameters la+lc = 100. A weak attempt at this is provided below for a specific ...
0
votes
2answers
99 views

Finding an idiomatic way to express a system of linear equations

I have an $n$ x $n$ matrix $T$, where $t_{ij}$ is the element at the $i\,$th row and $j\,$th column, and unknowns $x_i$, $1\leq i \leq n$, where $$x_{n} = 1$$ $$x_{n-1} = 0$$ $$x_i = \sum_{1\leq j ...
4
votes
2answers
313 views

Comparing 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 ...
1
vote
1answer
215 views

Recursive functions taking list arguments

I wish to create a function that takes lists (e.g. {plus,plus,minus,0,minus,plus}) and uses the input list to calculate a corresponding value using a set of ...

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