0
votes
1answer
347 views

How to prepare (copy/paste) data from Matlab?

What is the best way to get data from Matlab to Mathematica? For a new project I want to copy/paste a table (or part of it) of datas from Matlab to Mathematica. Copyed from Matlab it is: ...
7
votes
3answers
818 views

How to fix this memory leak

I am using halirutan's code in this thread to unflatten a list. It works very well but the problem is that the Module's local function f is not deleted when the ...
3
votes
1answer
515 views

Polar Differential Equation

I have a polar differential equation (this is the reduced variant) as: $$r' = 0, \theta' = 1$$ I figured out (from previous answers) that I can nicely convert this to Cartesian and use StreamPlot ...
0
votes
1answer
93 views

What is the meaning of Automatic in goodness of fit test?

I can't find what is the distribution corresponding to the default option in: DistributionFitTest[data, Automatic, "HypothesisTestData"]; Is it N(0,1), uniform?
0
votes
1answer
121 views

Advice on Gather

Is there a better way to write this gather? I have a list of particles, "particlelist", and a list of particle coordinates, "coordlist" and I want to put all the particles into a 3-dimensional ng x ...
0
votes
1answer
172 views

Plotting the discrete solution to a PDE

So I went through all the grunt work of solving a PDE in discrete form for a research project. Now I have a Temperature solution as a function of time and space: $$ T_{i}^{n+1}=\left( \dfrac ...
23
votes
4answers
1k views

“Unflattening” a list

Imagine we have a list with some hierarchical structure: list = {{{2,3},{2,4}},{{{3,4}}},{{5,6},{7,8}}}; Which we then flatten to some level in order to process ...
0
votes
1answer
220 views

Scaling the time axis of an interpolated function (as in a solution from NDSolve)

I'm wondering how I can change the units of the x (time) axis when plotting a solution from NDSolve. I have obtained three solutions to a system of differential equations, all of which exist over the ...
0
votes
2answers
103 views

How to obtain all the partitions in a set $A$ such that the union of these partitions equals $A$?

I'm trying to make a visual proof on the irrationality of $\sqrt{2}$. At the moment, I've created a figure to show that $b^2$ elements always constitute a square: And I want to show that it's not ...
0
votes
1answer
227 views

Bar Chart: How to adjust the font size for the bar labels as the chart size is manipulated

I have data that represents the binding energy of oxygen on different surfaces. Each bar is a different transition metal, and the length of the bar is the binding energy of oxygen. How do I make the ...
1
vote
3answers
68 views

Printing the base 'b' value of an integer as a string (without the subscript base indication)

Is there a simple one-liner to convert a given base 10 integer to a string representation of this integer in some desired base 'b'? Is there a way to do this avoiding the subscript indicating the ...
4
votes
3answers
219 views

Finding a better way to define a matrix

I first defined a 171x171 matrix containing only zeros and then replaced 18 specific rows with nonzero entries. The other $153$ rows will be average of $2$ of the existing $18$ rows. Rows $2$ ...
0
votes
1answer
1k views

Union::normal: Nonatomic expression expected when using Uncompress

I saved a expresion to a file like this Export["file.dat",Compress@myExpression]; Then (i don't know why) when I import the file i get the compressed expresion ...
0
votes
1answer
369 views

Solve[polynomial, x, Reals] doesn't get all real roots or correct ones?

My main confusion is about the difference between the two code blocks at the end of this long spiel, but the spiel contains the code to create the polynomial if its coefficients are helpful for ...
3
votes
1answer
52 views

Problem with parentheses and ScriptBaselineShifts

Style[ DisplayForm@RowBox[{"(", SubsuperscriptBox[2, 6, 7], ")"}], 18, Bold, ScriptSizeMultipliers -> 1, ScriptBaselineShifts -> {1, 3}] or for ...
4
votes
1answer
391 views

Creating a dynamic plot directly from the recurrence relation

I have the following recurrence relation that has no general solution: $$x(t+1) = \frac{x^2 + x(1-x)(1-sh)}{x^2 + 2x(1-x)(1-sh) + (1-x)^2(1-s)}$$ In Mathematica language it gives: ...
3
votes
1answer
326 views

Importing a Base64 encoded string

everyone, I'm handling some paragraphs enconded with Base64 from CSV file format. The problem is that Mathematica can't decode it. It seems Mathematica Encode/Decode their own Base64. I'm thinking ...
4
votes
3answers
2k views

Using If statements internal to Table [duplicate]

Is there a way to use If statements with Table? To give a kind of ridiculous example that captures to spirit of what I'm trying ...
2
votes
1answer
403 views

How to reverse the direction of the y axes on Graphics

Question related to this one, except I need the same for the Graphics. Lets say I have the following drawings: ...
4
votes
2answers
173 views

TrackedSymbols affected by CurrentValue. Another problem with SetDelayed(:=)+OwnVales in Initialization

It is MWE, only a Disk[] that should print "Click" when clicked. Also "date... updating" ...
1
vote
0answers
98 views

Finding undetermined coefficients with boundary conditions

I have 2 equations which are; To[x_] := c1 E^(-a1 x)/2 + c2 E^(a1 x)/2 + a2 Tu[x_] := c3 E^(-a3 x)/2 + c4 E^(a3 x)/2 Tu equals almost zero ...
2
votes
1answer
155 views

Defining conditional Notation rules

I am trying to define a notation rule so that for selected symbols subsripts will be equivalent to function parameters. My understanding of the docs suggests the following ...
1
vote
2answers
579 views

Given an equation with one parameter, how do I use NSolve to solve it for many values of the parameter?

I was wondering if there was a way to use the Mathematica NSolve command to solve an equation that has a parameter with various values. An example of which is: ...
0
votes
1answer
64 views

Why won't Manipulate work with symbols generated by Symbol?

Suppose I am provided with two data lists. (Assume for the moment that they are lists of integers.) I would like a function that generates bar charts that I can manipulate. Here is what I have: ...
3
votes
0answers
92 views
1
vote
1answer
115 views

Customize TableForm behavior for a single function

I have a function of this form Garch[a,b,c....] that gives me a list as an output,where the first column collects names of output variables. Is it possible ...
1
vote
1answer
100 views

Efficient calculation of diagonal matrix elements

I have a matrix $V$ of size $M$ in which each row $i$ is a vector $v_i$. Now I have another matrix $H$ and I would like to calculate as efficiently as possible the list of values $v_i^\dagger\cdot ...
2
votes
1answer
708 views
1
vote
1answer
115 views

Confidence Regions for NonLinearFit with “complicated” integral model

I have a set of data $y_i (z_i)$ with errors $\Delta y_i$, that can be found here Here Thus first, I call the data ...
0
votes
0answers
40 views

Notification when evaluation completes [duplicate]

I thought it would be fun to see a list of ways to have Mathematica notify you when a long evaluation completes. There are a few posts up already that address specific methods, given below, but not ...
3
votes
1answer
173 views

ListContourPlot memory problems?

I have a simple 3d dataset (size 7035 x 3, I put it on my site if you want to check) which I want to plot with ListContourPlot: ...
2
votes
1answer
268 views

Ubuntu global menu bar integration?

Is there a way to integrate the Mathematica menu bar into the Ubuntu Unity global menu bar at the top of the screen? (I'm not looking to run mini-applications.) Thanks!
0
votes
1answer
113 views
0
votes
1answer
954 views

representing triplet data set with color on 2d plot [duplicate]

I have a huge list of data in the form of triplets numbers (e.g. {x,y,z}) and I want 2d plot. In which I want to plot y vs x on which values of z should be shown with color depending on the value of z ...
0
votes
1answer
98 views

Make several separate Manipulate controls on a single line?

How do I make several different Manipulate controls appear on a single line? I currently have both a Slider and an ...
2
votes
1answer
198 views

How to operate with function body without evaluation

I have several functions (let a[x] and b[x]), defined as expressions with integrals and differentiations. I want to perform some ...
0
votes
2answers
243 views

Selecting index position of data from a table that is less than a certain value

I have a table of numbers with a few thousand entries, and I'm trying to find the first index that is less than a particular value. An example of the table I'm working on is as follows: ...
0
votes
1answer
44 views

Storing solution to x and y [duplicate]

If I do sol=Solve[{2x+2==y,3x+9==y},{x,y}] then Mathematica will tell me {{x -> -7, y -> -12}} But I would like to ...
1
vote
0answers
56 views

How to find out how Mathematica performed an integration? [duplicate]

In terms of integration, I usually utilize Mathematica 9 to compute scattering amplitudes in quantum field theory. Recently, I employed it to compute a particularly difficult integral, and it ...
0
votes
1answer
182 views

Multiple Simulations of a Markov Chain

I am trying to create a simple series of Bernoulli bits whose probabilities follow a two-state Markov chain. ...
2
votes
1answer
137 views

Determining sample size with no replacement for a given confidence and reliability when there are x failures observed during sampling?

I am trying to follow the procedure of a Sandia Labs report found here to determine the required sample size, for various population sizes, with no replacement for a given confidence and reliability. ...
1
vote
0answers
67 views

Inverse Z Transform returning complicated expression

I want to study how the Z transform changes with the sampling rate T, in a closed loop system. The command I'm using to do this is: ...
1
vote
1answer
437 views

Plotting solutions of a 4th order polynomial equation

I have a polynomial equation of the fourth order, which has $4$ roots depending on a variable parameter s1. For each s1 I have ...
2
votes
2answers
306 views

Plot Wiener Process and its running maximum

I want to plot a Wiener process $B=(B_{t})_{t≥0}$ and its running maximum $S_{1}=\max_{0\leq t\leq1}B_{t}$ on Mathematica. Can anybody help? I only know how to generate a Wiener process using ...
0
votes
1answer
83 views

Running function - updating list - run function etc

I am making a larger program, so I would prefer to give a short example of my problem: ...
6
votes
1answer
396 views

What is the mathematical meaning behind D[f]?

y = a + b x; I can understand this output of the ordinary differentiation of y w.r.t. x ...
1
vote
1answer
77 views

Variable location for intial value in ParametericNDSolve

I am trying to figure out if Mathematica allows a variable location for a known initial value for ParametricNDSolve. I haven't been able to find an example where ...
4
votes
1answer
439 views

Why IntegerPart[x/(x/2)]=1?

Consider this code x = 0.109354682484; IntegerPart[x/(x/2)] (* 1 *) Precision[x] (* MachinePrecision *) Why does it give 1 ? Version number: 9.0 on Mac 10.9.2 ...
0
votes
1answer
285 views

Index of iteration inside NestList [duplicate]

I have a list of RandomReal: delta = RandomReal[{-0.01, 0.01}, 1000] I want to add each element of the list to the ...

15 30 50 per page