0
votes
1answer
73 views

Codes for the derivative of a random polynomials

Good day! Please, I need some help here, I used this codes ...
0
votes
1answer
140 views

Maximum element and its position (row,column) of matrix

Can someone help me to get the maximum element of $m\times n$ matrix and corresponding row and column $(i,j)$?
0
votes
2answers
460 views

Log Linear Fitting of a data: e.g. {xi,Log [yi]} and plotting the fit

I have a Log-Linear plot, and i'm unsure about how to fit a line to it. The data represents a I (current) vs V (voltage) curve. The exponential portion of this curve (linear in a Log-Linear plot) is: ...
0
votes
1answer
2k views

Recursion depth of 1024 exceeded during evaluation [closed]

This is my very first day using Mathematica, so please forgive me my complete ignorance... I fear that this might be one of those questions that gets rejected for being "easily found in the ...
1
vote
4answers
257 views

How can I remove horizontal lines on a phase plot for a pendulum?

I am attempting to do a phase plot for a driven,damped pendulum. When the angle wraps from Pi to -Pi or -Pi to Pi I get a horizontal line on the plot. I would like to remove these lines as they mask ...
2
votes
0answers
125 views

Symbol with left and right subscript and right superscript

I am trying to come up with a variable that has a left and right subscript and right superscript. I have tried the following ...
1
vote
0answers
47 views

Find region given by Exists statement [closed]

I want to find, calculate its volume and visualize the following region most efficiently: $\Gamma^\delta$ = { $\sigma$: $\exists \sigma' \in \Gamma$ with $F(\sigma,\sigma')\leq 1-\delta^2$}, where ...
1
vote
2answers
135 views

Label point on plot with image instead of text [closed]

I can use this code to label my points with text. ...
5
votes
1answer
230 views

NDSolve and FEM support for non conformal meshes of a disk [with Kernel crash]

I want to create an ElementMesh for a disk. For my specific scenario, some author advise to use a regular mesh, where the radial and tangential directions are ...
2
votes
3answers
195 views

Simplify a composition of functions

How do I make Mathematica simplify, for example, (1-#&)@*(1-#&) into #&? ...
1
vote
0answers
260 views

How to get Mathematica to compile with target C? [closed]

I have been trying to compile some functions in mathematica with target C for speed. basically when I try: ...
8
votes
4answers
833 views

Replacing a for-loop with something functional

I'm a physics grad and have been using Mathematica mostly for data visualization. The evaluation part I normally do with C/Python, but I've been wanting to try out Mathematica for these tasks, too. ...
0
votes
0answers
70 views

Statistical significance test of FindCluster

I have a list of vectors which could be roughly divided into two clusters. The list is huge so I have to use RandomChoice[list, 20000] to speed up the calculation. ...
1
vote
1answer
90 views

save as pdf output appears really narrow and has many pages

If I attempt 'save as' pdf I sometimes (but not always) get really narrow output, resulting in many pages of output. Notice how little text ends up on the page. I can't see any settings that I've ...
2
votes
2answers
155 views

Filling between more than two boundaries

Here is a simple example of what I am trying to do; fill the area described by the three inequalities: $$ y \le 11 + x \label{1} \tag{1}$$ $$ y \le 27 - x \tag{2}$$ $$ y \le ...
2
votes
3answers
405 views

How to insert a Matrix into a larger matrix

I have a 4x4 matrix v1 v2 v3 v4 myM={{a1,a2,c1,c2}, v1 {a2,a3,c2,c3}, v2 {c1,c2,d1,d2}, v3 {c2,c3,d2,d3}} v4 And I want to ...
1
vote
2answers
400 views

Minimizing the largest difference between two functions

I have two functions defined on the same domain, $f(x)$ and $g(x)$ where $x$ is in $(0,1)$: f[x_] := (-1 + x) Log[1 - x] - x Log[x] g[x_] := Log[1 + 2 (-1 + x) x] ...
4
votes
1answer
135 views

How to use Epilog with Tradingchart

I am making a Tradingchart with data returned from Financialdata. I find I cannot add a line to the chart by giving the option ...
3
votes
2answers
103 views

Combining sub-matrices by replacing zero elements with symbols

I have a nested matrix as m: ...
5
votes
1answer
248 views

FindFit returns “tensors have incompatible shapes”

I'm trying to fit experimental data with FindFit and implicitly calculated function. It seems, that function works fine and satisfactorily approximates data when parameters are fed manually. However ...
5
votes
1answer
257 views

Compile, “global variables” and recursion

I am trying to do something similar to this, namely to make a Compile'd function outer that itself calls a ...
0
votes
1answer
91 views

How to determine a function that fits a geological model

I have a problem. I am currently working on a code that works by comparing data (real or synthetic) to an earth model (described by earth layers, or in this particular, velocity (...
7
votes
1answer
111 views

Sum over Binomials and Gammas

Given the function, ...
4
votes
2answers
100 views

Make a time IntervalSlider

I want to make a time interval slider with an initial setting of (10:00:00 Mar. 8 2015, 12:30:00 Mar. 8 2015) and which varies from 00:00:00 Mar. 8 2015 to 22:30:00 Mar. 8 2015 with a granularity of ...
7
votes
1answer
286 views

How to integrate Mathematica with other software

Mathematica is a fantastic platform for Mathematical analysis, physics, quantitative finance and most realms of scientific work. However, it doesn't serve well for general purpose programming, in ...
4
votes
2answers
129 views

How can I get the style of a CellObject?

I want to work on a notebook programmatically with CellObjects. lets create a notebook for example: ...
1
vote
2answers
61 views

Coordinates of MeshPoints

The output of a set of differential equations solved with NDSolve produces a series of curves and I need to obtain the spacing between these curves at a given level ...
4
votes
0answers
123 views

What is the exhaustive list of categories and properties that ImageIdentify can output? [closed]

I'm looking for a complete list of ImageIdentify's outputs. I'm seeing entities like the one below, so I'm wondering what all possible classes are if they have ...
4
votes
2answers
2k views

No weekends please

I need to get the DateValues of the last 30 days (starting from yesterday, not today!) excluding saturdays and sundays. I want that the dates are german time (GMT ...
2
votes
1answer
45 views

Dialog-type notebook

I have the following dialog to calculate the product of a and b: ...
2
votes
3answers
182 views

How can I get from a list of characters representing a permutation to graphics showing the cycles?

I am trying to graphically represent cycles in various permutations of the alphabet, and have a question in two parts. I have ...
1
vote
1answer
223 views

Plot a parametric equation in cylindrical coordinates

I'm looking for a way to plot this parametric equation on cylindrical coordinates. r = e^t theta = t+1 z = e^2t Any help would be appreciated
0
votes
0answers
35 views

How can I increase plotting resolution with RegionPlot3D? [duplicate]

I am trying to plot a region with RegionPlot3D, but I have some problems. Here's the code I use: ...
1
vote
1answer
154 views

Poisson PDE in a rectangular domain

I found a solution for this problem, but this is in Scilab and I never use Scilab. Can anyone can help me to translate it in Mathematica? Here is the Link:http://imechanica.org/files/TorqueR.pdf I ...
6
votes
6answers
291 views

How to check if two nested lists have the same structure?

How can I check if nested lists like these have the same structure: ...
-1
votes
1answer
144 views

Function for importing and plotting data from excel spreadsheet

I know this must be a very basic question, but I could not find any answers. I need to create a function that: 1) imports data from an Excel Spreadsheet, 2) assign specific information from this xlsx ...
1
vote
1answer
84 views

Multivariate Exponential Distribution in Mathematica

Is there a way to define a multivariate exponential distribution based on independent univariate exponential distributions (Akin to multinormal distribution): ...
20
votes
5answers
707 views

Plot a partition of the sphere given vertices of polygons

I saw in this question that Mathematica can draw spherical triangles. I guess something similar can be done to plot a spherical polygon. I am interested in something similar: I have a set of ...
3
votes
2answers
95 views

SameTest issue?

Folks, I am trying to construct and algorithm which finds all of the remaining groupings (of three items, in this case) from a list of items for which no two items are in groups that have previously ...
2
votes
2answers
167 views

How to make a time slider like Manipulate[n,{n,1,20,1}]?

I want to make a time slider varied from 12:00:00 Jan 1,2015 to 22:30:00 Jan 1,2015 for every 5 minute. So like using Manipulate[n,{n,1,20,1}], ...
9
votes
3answers
280 views

How to speed up auxilary DoolittleDecomposite function?

The Doolittle Decomposition algorithm as below: $$A=LU$$ where $A= \begin{pmatrix} a_{11} & a_{12} & \cdots a_{1n}\\ a_{21} & a_{22} & \cdots a_{2n}\\ \vdots & \vdots & \vdots ...
1
vote
1answer
78 views

Counting and updating a subset of matrix

I have an n by n matrix and would like to count the number of sub-matrices that is equal to a given matrix. Here is my code: DWBCL creates a matrix with elements a1, a2 and c2 in it and DWBCH with b1, ...
2
votes
1answer
449 views

What is the meaning of two square brackets in function definition? [duplicate]

I came along the following function definition f[a_, b_, c_][r_] = ... with some function on the right hand side. Is this equivalent to ...
2
votes
2answers
88 views

Why is there always a horizontal tail line on the parametric curve?

I am trying to create a smooth, piecewisely continuous and differentiable curve by using Mathematica's Floor function, which is as in: ...
0
votes
2answers
56 views

Barlegend with a different z span for ListDensityPlot

I would like to rescale the colors in a plot and to do this in the same way for the color bar. (So this enables me to have the color bar span a (z) range larger than than the data itself.) I got this ...
4
votes
1answer
98 views

Adding extinction factor to Monte Carlo analysis

I'm looking to add an absorption component to this Monte Carlo analysis, essentially I want there to be a 1% chance that a photon gets absorbed at each event as it travels through the medium, once the ...
0
votes
0answers
64 views

How to create a big jacobian matrix function over some variables of a vector function?

Suppose I have a vector function of $n$ components and it has $n+m$ arguments, $$\vec{f}(x_1,x_2,\dots,x_n, y_1, y_2, \dots, y_{m})$$ where $n, m $ are around 10. I want to create a Jacobian matrix ...
1
vote
2answers
76 views

Filling a matrix with a list of lists

I have a list of lists with different lengthes: {{a1,a2},{b1,b2},{c1,c2,c3},...} Now I want to create a matrix the following way: ...
-1
votes
1answer
45 views

Not plotting elliptic integrals [closed]

Integrate[1/Sqrt[mu^2 - Cos[t]^2], t] CenAng[t_, mu_] := EllipticF[t, 1/(1 - mu^2)]/Sqrt[mu^2 - 1] ParametricPlot[CenAng[t, mu], {t, 0, Pi/2}, {mu, 1.01, 3}] ...
4
votes
1answer
130 views

How to restart a Clock

The code below is to demonstrate color afterimages. The user chooses a color, fixates the changing number at the center until it reach 30 (seconds), then manually switches to white to observer the ...

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