0
votes
0answers
14 views

Propagation of error for not-analytical calculable inverse function

I have the function: gcsymb[Lpd_,a_,c_]:=1 /finv[1./Lpd^2,a,c]/Lpd with the definiton of finv: ...
3
votes
0answers
25 views

Expanding PolyGamma function error

For large half-integer arguments of PolyGamma[] function the FunctionExpand[] or ...
1
vote
3answers
55 views

Minimal overlap area of circles

I have 20 points in the 2D plane with $(x_i,y_i)$ coordinates. I want to use Mathematica to optimally distribute 10 circles with equal radius of a given positive value $R$, i.e. to determine with the ...
0
votes
0answers
30 views

Legendre expansion of functions

I am given the expansion for the Legendre function of the first kind. It is just $$f(x)=\sum_{n=0}^{\infty}A_{n}P_{n}(x).$$ I have found the expression for the coefficient $A_{n}$. However I would ...
1
vote
0answers
31 views

Calculate sum of probabilities in multinomial model

The question at hand: On average in every 7th chocoloate egg there is a figure to be drawn from a known list of special figures (e.g 15 distinct pieces) the other draws are on average fails. With ...
0
votes
1answer
24 views

global variables

I have a workbook I am writing, there are 2 cells in it and then each cell is divided into sub cells. At the top of the first cell i made a bunch of variable assignments such as length=10, x=6, d=4, ...
0
votes
0answers
21 views

How does KalmanEstimator update the Kalman gain, process noise and state variable mean?

The first "Application" in the documentation for KalmanEstimator is copied below with additional variables for clarity. ...
1
vote
0answers
19 views

We need to know the input signal when we use KalmanEstimator?

The first "Application" in the documentation for KalmanEstimator is copied below with additional variables for clarity. ...
3
votes
0answers
20 views

What does OutputResponse[sys, { {u1,u2,u3}, {v1,v2,v3} } ] do?

I am puzzled by the result of OutputResponse[sys, {{u1,u2,u3},{v1,v2,v3}}]. OutputResponse is used this way in the first "Application" in the documentation for ...
2
votes
1answer
165 views

What is wrong with FindRoot?

I am trying to find a numerical solution to the following transcendental equation ...
1
vote
0answers
14 views

Open file menu bug with ubuntu dark theme

I'm using Ubuntu with a dark theme and the navigator on the open file menu is now with a white background and white letters. Is there a way to fix this?
2
votes
0answers
19 views

WSTP/MathLink: Transfering long lists (that require 64bit for index range)

I am using WSTP to call external C-Code from a Mathematica 10.2 session on a Linux-x86-64 system. The routine WSGetReal64List(WSLINK link,double **a,long *n) seems ...
0
votes
1answer
38 views

Strange Simultaneous Equations [on hold]

Solve the simultaneous equations: 70-T=7a T-40=4a By multiplying both sides of the equations by a factor and shifting the terms I transformed them into the following form: -28a-4T=-280 ...
0
votes
0answers
24 views

Problem with 3D plots window crashed

My mathematica7 window in fedora21 crashed when 3d plots are rotated without any warning message. I checked webpages for any solutions and found one answer. I followed it typing mathematica -mesa ...
0
votes
0answers
30 views

Time zone Projection

I'm not entirely sure if you can do this, but I'm trying to import a sphere with an accurate time zone projection into a CAD program called Rhinoceros 5. Is this possible? I need it in Rhinoceros 5 ...
9
votes
1answer
81 views

How to restore corrupted files?

I have a file that I can't reopen because MMa was "Not Responding" and I had to shut it down. I found links online to this: http://support.wolfram.com/kb/12423 I executed those two instructions in a ...
0
votes
0answers
32 views

How to avoid “Quit[]” to execute notebook multiple times

I am using a program to binarize several images and then adding all the images together using "ImageAdd" to get one image. This image is required for further analysis of the images. The program ...
3
votes
1answer
72 views

EquationTrekker using Mathematica 10.2

I wonder whether the problem that arise with the following code is specific to my machine, as it seem to work with the documentation example. ...
3
votes
2answers
112 views

Looping through 3 million elements of a list to 'Set' values is slow

I am looping through the 3 million elements of a time-series (v1, o1) and corresponding values (v2, o2). v1 contains a uniformly increasing timestamp (e.g. 1 to 3,000,000 in increments of 1) o1 ...
0
votes
1answer
48 views

Problem with mathematica plot 3d [on hold]

u[x_, t_] := (x - t)*e^(-(x - t)^2) u[x, t] Plot3D[u[x, t], {x, 0, 5}, {t, 0, 5}, AxesLabel -> {x, t, u}] I get an error Plot3D::exclul: {Im[e]-0} must be a ...
0
votes
0answers
23 views

Problem with mathematica code [duplicate]

Plot3D[u[x, t], {x, 0, 5}, {t, 0, 5}, AxesLabel -> {x, t, u}] I get an error Plot3D::exclul: {Im[e]-0} must be a list of equalities or real-valued functions. ...
6
votes
1answer
69 views

Extracting fit weights directly from a FittedModel object

Suppose I have the following data: ...
3
votes
0answers
38 views

What are all the elements of the expression returned by KalmanEstimator used for?

The first "Application" in the documentation for KalmanEstimator is copied below with additional variables for clarity. ...
-3
votes
1answer
46 views

How to sort my list? Help [on hold]

I have a list={1,2,3,4,5,-6,9,3,12,0,-3}. I want to sort its, as way {even,odd,even,odd,....}. Moreover in crescent way for even and odd numbers. So the result ...
2
votes
1answer
77 views

Eigenvectors of numerical matrix

I have a large numerical matrix whose eigenvalues are all distinct. In the documentation for Eigenvectors it says: For approximate numerical matrices m, the ...
2
votes
1answer
48 views

Plot using a list of variables

I have the following code: ...
4
votes
2answers
72 views

FunctionInterpolation and Which combine badly

Update: The main question has been answered, but my problem hasn't been solved. The problem is I have a situation where I want to use Which on an InterpolatingFunction several times to repeatedly ...
3
votes
0answers
57 views

NSolve doesn't work on an equation containing a numerical integral and constraints

I'm having trouble getting Mathematica to solve equations numerically. I know that its important to specify the type of variables for pattern testing (see e.g. here) but this doesn't seem to work. ...
0
votes
1answer
74 views

Special fractions generator

Note that 13/33, 1313 / 3333 , 131313 / 333333, ... They are always equivalent fractions Fraciones generate desire to have this property based arbitrary ...
4
votes
3answers
231 views

Constructing Tri-Diagonal Matrices

Fractional Calculus Course, we are instructed to create an $n \times n$ Tri-Diagonal matrix in the form of: \begin{array} a A &= \begin{bmatrix} 2 & -1 & 0 & 0 & ... ...
5
votes
1answer
72 views

Finding planetary conjunctions with Mathematica (project-level)

Summary: What's an efficient way of finding planetary conjuctions with Mathematica using the SPICE kernels, and without using AstronomicalData (which I believe is less efficient). NASA publishes ...
6
votes
3answers
120 views

Fitting data with interdependence

I have an issue, of which I'm not sure it can be solved, with or without Mathematica. I feel as if it should be possible, but I'm quite clueless as to how. Some introduction is required. I'm working ...
0
votes
0answers
7 views

Lychrel number Algorithm [migrated]

Recently became fascinated with the search for Lychrel and palindromic numbers as recreational mathematics. for the who are unaware, the process for performing this check on a number manually is as ...
-2
votes
1answer
70 views

Are these codes the same?

I have this code: ...
7
votes
2answers
127 views

ListLinePlot Filling Wrong

Bug introduced in 8.0 or earlier and persisting through 10.2 or later. I used ListLinePlot to plot data from .csv files. However, the y-values from Graph 1 do ...
0
votes
1answer
82 views

Using Plot and Piecewise to graph a roller coaster

I am graphing a roller coaster using Piecewise and Plot commands on Mathematica. I have the first 2 Piecewise functions and would like to add a loop to the end of it. Here is my initial graph: This ...
3
votes
1answer
43 views

NDSolve: obtain time difference when different solutions get same distance to equilibrium value

I have a numerically solved a differential equation which has an equilibrium value and a starting point, both included as a parameter. I want to plot the difference between the times it takes to come ...
2
votes
0answers
27 views

“Undo” not working for script, gothic, and double-struck letter forms?

Has anyone else experienced anomalous behavior using "Undo" (Ctrl-z) with notational alphabet letter forms? Since Mathematica's built-in functions are capitalized, one generally avoids beginning ...
3
votes
1answer
85 views

DensityPlot: giving the same color to a range of values

The following command DensityPlot[x y, {x, -3, 3}, {y, -3, 3}, PlotLegends -> Automatic, ColorFunction -> {"Rainbow"}, PlotRange -> {{-3, 3}, {-3, 3}}] ...
4
votes
0answers
37 views

Can I customize the shell command line prompt?

Is there a way to customize the command line prompt (e.g., colorize it) for MathKernel when it runs as a shell command (in general, but specifically on OS X)?
3
votes
2answers
138 views

Automatically detect higher slope in numerical data (within a certain range)

Suppose the dataset data is part of some simulations whose results should follow a certain model. Here is data and its ...
2
votes
0answers
103 views

Brownian Bridge - Multiple Paths

I am attempting to simulate multiple Brownian Bridges on the interval [0, 1]. I have the following snippet: ...
0
votes
1answer
70 views
0
votes
0answers
4 views

Posted a question, then finshed registering. But the questions is not mine [migrated]

I posted a question on this website (http://mathematica.stackexchange.com/questions?page=2&sort=newest), and then I completed the registration afterwards from the email that was sent. However, the ...
0
votes
0answers
70 views

Solve won't solve $x = y^2 - z^2$ for $z$ [on hold]

Although this equation can be solved in my head, it's bugging the crap out of me that Wolfram|Alpha can solve this, yet Mathematica can't. I'm trying to solve this equation for z: $\quad \quad x = ...
1
vote
0answers
29 views

import of a opj file (Origin)

Is there a way to import a file of opj-type? Or do you know a package to convert the data? The Import[] function seems not to know this format.
-2
votes
0answers
34 views

ExportString and CreateExecutable

Re Mathematica 10.2 under Windows 8.1. The following post to Wolfram Community ... http://community.wolfram.com/groups/-/m/t/556769?p_p_auth=PQNE4sC5 ... asks why an error message says "...convert ...
3
votes
2answers
132 views

Modifying the content of a list

If I have a long list of form {{1,2,3,4},{5,6,7,8}, ... {97,98,99,100}} how do I edit/convert it by adding the text as shown below ...
0
votes
1answer
51 views

ParametricPlot and Piecewise function

I want to create a ParametricPlot with multiple Piecewise functions in it. I have tried the following code but it doesn't work ...
9
votes
2answers
122 views

How to generate a closed B-spline curve?

I wrote a function called deBoor by the Cox-De Boor algorithm to generate a B-spline curve. ...

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