0
votes
0answers
9 views

Strange style conversion indicator appeared when type “a Pre”

I got the following strange style conversion indicator when I was typing a Pre(character a and ...
0
votes
0answers
3 views

finding eigenvectors of a n*n symbolic matrix

is it possible to find eigenvectors and eigenvalues of this matrix in mathematica?i have no idea about solution!please help... ...
-1
votes
0answers
53 views

ParametricNDSolve KKT Constraint Directly

I am trying to directly solve for an optimal control using Pontryagin Maximum, where H is the Hamiltonian, in the presence of a KKT constraint. The constraint is ignored. I am wondering if a direct ...
2
votes
1answer
33 views

Calendar view outline

How to compute the outline of a calendar month like this D3 example. (D3 is a functional language built on JavaScript developed at Stanford and used by New York Times to deploy interactive ...
2
votes
1answer
24 views

Where can I put my conditions?

I just learned in this answer that you can put conditions inside a With and thus use computed values in them, like this: ...
30
votes
9answers
4k views

Circuit drawing in Mathematica

This past semester I taught an introductory electromagnetism course and had quite a nice time using Mathematica to draw all sorts of figures and diagrams (mostly for problems and etc.). However, I was ...
1
vote
1answer
15 views

Find maxima and minima of data like {time,value}

I have a list of time and values of the charge and discharge of a capacitor, and i want to separate in two list of {time,value of charge} , {time, value of discharge} I know there is a lot of the ...
1
vote
0answers
14 views

How to regress negative log?

I made a regression using Linearmodelfit. The residual-fit plot showed that this was not a good approximation. Now I'm trying to use Nonlinearmodelfit. I assume my data to have a negative log look. ...
3
votes
3answers
102 views

How to use a compiled function in numerical optimization

I'm trying to wrap my head around function Compile. So, this is a spin-off question from: a previous question on using compile[] correctly. I have a function that ...
0
votes
0answers
37 views

ComplexExpand does not treat everything as real number

ComplexExpand does not treat everything as real number?? Please read the following simple example ...
1
vote
1answer
30 views

How can one get rid of the “Template notebook” bar in Mathematica?

Alright, maybe I'm just really stupid. But I tried my damnedest to get rid of this stupid toolbar. I checked every menu and searched google for a solid 20 minutes. Eventually, I just copied the code ...
0
votes
0answers
14 views

ReplaceRepeated vs DownValues speed

I have to solve a problem by recursive substitution. I programmed it two different ways: using ReplaceRepeated and using ...
0
votes
0answers
8 views

Error While Doing NIntegrate function

I am trying to calculate this expression in mathematica but I always get 3 errors which are the integrand...has evaluated to non-numerical values for all sampling points in the region with boundries ...
0
votes
0answers
16 views

Limited Opacity Levels in Image3D?

I'm trying to render a simple spherical distribution where the opacity varies with radius using Image3D. Unfortunately, the outcome is not very appealing, with ...
3
votes
1answer
35 views

Recursive partitioning: Is there a better way to do this?

Consider the following function, which recursively splits a list into equal length sublists (the length of the list is assumed to be a power of the second argument): ...
1
vote
0answers
45 views

Mathematica does not calculate inverse fourier transformation or the convolution of two functions

I am trying to take convolution of a Gaussian function with an exponential function. Mathematica couldn't calculate it. ...
1
vote
0answers
13 views

Combine ImplicitRegion

I have a starting and a target set which I would like to represent via ImplicitRegion. I can evolve each point p of the starting ...
0
votes
1answer
61 views

My Baum-Welch algorithm is very slow. Is it due to Mathematica?

I've also posted this question here, since I'm not sure which community is more adequate for this type of question. I've programmed imperatively the Baum-Welch algorithm for a 2 state hidden Markov ...
2
votes
1answer
64 views

Plotting 3D Vector Field in one plane

I want to plot a vector field F={Fx, Fy, Fz}. However, I only want to plot it in one plane (say, z=0). When I use ...
1
vote
2answers
66 views

Controlling PointSize in a RegionPlot

I have a "named" point in Mathematica 10 and am plotting it like this using RegionPlot: ...
1
vote
1answer
31 views

How to simplify symbolic matrix multiplication using the associativity of scalar multiplication?

My input is (2A).(3B). Is there a way to get 6A.B? All I could get back from Mathematica was ...
-1
votes
1answer
46 views

Labeling named point in Mathematica 10 [on hold]

I have a "named" point in Mathematica 10 defined like this: point["camp location"] = Point[{latitude, longitude}]; I assume there is some way to make the name of ...
1
vote
0answers
137 views
+200

Curve fit based on minimal data

Inspired by the fantastic answers here and here, I would like to ask a questions along similar lines. I have 6 curve types that follow these rules: Type A: If point 1 is positive and point 2 is ...
0
votes
0answers
20 views

Fitting a plane from a set of (x,y,z) values with uncertainties on 3 variables

I would like to fit a plane from a set of measurements (x,y,z) with uncertainties on the 3 variables. Currently I am using the command "LinearModelFit" that computes the best plane but I have a ...
6
votes
3answers
248 views

How to deal with recursion formula in Mathematica?

In engineering problems, I am always seeing many recursion formula. For instance, In the book "The NURBS book", I discovered many recursion formula Fibonacci ...
0
votes
2answers
57 views

Select pairs of columns from an array of data

I try to interpolate the first two columns of a seven-column file formatted as follows: ...
0
votes
1answer
28 views

Retain or delete parts of textstring in tweets

For a twitter analysis I collected many tweets. For example: ...
1
vote
0answers
40 views

Puzzling NDSolve[] behavior for PDE (smooth solution, inconsistent with boundary conditions)

Consider the following: NDSolve[{D[z[x, y], x, x] + D[z[x, y], y, y] == 0, z[x, 0] == Sin[x], z[0, y] == Cos[y]}, z[x, y], x, y] {{z[x, y] -> ...
3
votes
2answers
115 views

Triangulated Mesh from Voronoi Diagram

I want to generate a mesh (using Mathematica 10) in the following manner: Generate a Voronoi diagram, like so: and then triangulate each individual Voronoi grain, were an edge is formed by ...
1
vote
1answer
60 views

How a novice user better understand the Q/A

A novice user reading Q/A here: I sometime need to just understand the syntax and meaning of commands exampled here. where is the best place to find it?
11
votes
5answers
484 views

Permutations[Range[12]] produces an error instead of a list

This input: Permutations[Range[12]] Results in this (error) output: ...
0
votes
1answer
45 views

Display solution of Solve without the arrow [on hold]

Is there a way to format Solve or something that I get the result of a calculation without the arrow, so if my result is like ...
18
votes
4answers
4k views

Finding Local Minima / Maxima in Noisy Data

I'm trying to find local minima / maxima in noisy data, consisting of data values taken at certain time intervals. Ideally, the function should take a pair of lists (one containing time values and one ...
2
votes
4answers
200 views

Get 'new' list of data by manipulation 'old' list

Assume I have the the following list of data: valuesOld = {5, 10, 15, 20, 25, 35, 40, 45, 55, 65, 80}; I would like to construct the following list: ...
0
votes
0answers
16 views

WhenEvent: forcing the solution to be non-negative for a system of coupled PDEs

I am newbie in Mathematica, but need to use and modify a code written by another person. The code is solving a system of coupled PDEs (reaction-diffusion system) using ...
3
votes
1answer
49 views

Why PlotStyle->Dashed make everything dashed?

It has been really strange for me. I am not sure it's regression after v10.0.1, or something went wrong with my system. After running this simple code ...
1
vote
1answer
51 views

Definite Integral over Bessel Function

Hello I am interested in evaluating the following integral. ...
6
votes
3answers
103 views

Add text after label in a Manipulate graphic

I can add the value of a slider to the right of it using the Appearance-->Labelled option, but what if I want to add text after the automatic label. How can I do that? Normally I want to do this to ...
0
votes
2answers
43 views

Spherical parametric plot

How can I plot such a parametrized curve: $r = 2cost + sint$ $\theta = t$ $\phi = sin10t$ where $0<t<\pi/2$. In the documentation only has been discussed parametric plot in Cartesian ...
1
vote
2answers
51 views

Manipulate with Locator question

Here is an example from Mathematica's help: Manipulate[Graphics[Polygon[pt], PlotRange -> 2], {{pt, {{0, 0}, {1, 0}, {1, 1}, {0, 1}, {1, -1}}}, Locator}] ...
5
votes
3answers
174 views

Finding totals in a Dataset

I have this Dataset: ...
0
votes
0answers
27 views

Using variable values from Manipulate in later Plots etc

i wanted to get write something that gives me all the values i want for the Student -t distribution. In my definition i tried to acess the variables, df and t, to later plot how it looks like in a ...
3
votes
2answers
173 views

A problem about recursion formula of deCasteljau algorithm

I use mathematica to realize the deCasteljaul algorithm $$\vec{P}_{k,i}(u_0)=(1-u_0)\vec{P}_{k-1,i}(u_0)+u_0\vec{P}_{k-1,i+1}(u_0)$$ The graphics that deCasteljaul algorithm generated as below: ...
0
votes
0answers
14 views

Changing default behavior of Series to give slightly different SeriesData

I am working with complicated expressions expr which contain symbolic function the f[x] which I know to have a pole at ...
0
votes
2answers
64 views

Numerical Integration

I have used the following code to evaluate an integral (val) numerically ...
0
votes
0answers
25 views

Replacing variable names in a notebook

I am working on a code that simply imports and graphs a function. If I preset the directory I would have something that looks like this: ...
3
votes
1answer
69 views

Why does BernsteinBasis not plot correcly?

I want to use the built-in function BernsteinBasis to learn about Bezier curves. I tried the following: ...
3
votes
1answer
108 views

How can I read compressed .Z file automatically by Mathematica?

When I read .Z file by something like jpldatstring = Import["ftp://cddis.gsfc.nasa.gov/products/jpl/2003/jplg0040.04i.Z"] Unfortunately, it turned out that ...
1
vote
0answers
47 views

Simplify polyhedral Regions like Interval

I don't think there's a built in "RegionSimplify" for polyhedral Regions and derived akin to Interval Interval[{0, 1}, {1, 2}] ...
0
votes
3answers
63 views

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