# All Questions

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### Entropy of lists and sublists

If we examine the following entropy outputs below, it can be seen that the entropy of {{a, b}, b, c, d, e} is not different from ...
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### 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 ...
47 views

### Global variables [on hold]

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, ...
41 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. ...
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### 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. ...
28 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 ...
228 views

### What is wrong with FindRoot?

I am trying to find a numerical solution to the following transcendental equation ...
16 views

### Open file menu bug with ubuntu dark theme [on hold]

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?
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### 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 ...
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### 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 ...
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### 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 ...
63 views

### Time zone Projection [on hold]

This question stems from another question at here. I want to compare time zones (civil time) with watch readings from a model clock (see illustrations in link above) using this theory. I'm not ...
97 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 ...
39 views

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

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 ...
90 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. ...
144 views

### Looping through 3 million elements of a list to 'Set' values is slow [on hold]

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 ...
50 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 ...
24 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. ...
78 views

### Extracting fit weights directly from a FittedModel object

Suppose I have the following data: ...
41 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. ...
48 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 ...
85 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 ...
51 views

### Plot using a list of variables

I have the following code: ...
84 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 ...
60 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. ...
75 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 ...
237 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 & ... ...
96 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 ...
127 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 ...
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### 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 ...