# All Questions

71,093 questions
Filter by
Sorted by
Tagged with
5 views

### What class order should I use to study calculus?

I would like to know how I should go about studying calculus, and in what order should I take the classes. I have searched tirelessly for answers and I am still confused. Here is what I have gathered ...
6 views

### Select a subsequence of a sequence according to tosses of a biased coin

I have a sequence, from which I would like to select a subsequence, each term of the original sequence being included in the subsequence with probability $p$, independently of the other terms. That is,...
9 views

...
21 views

### Symbolic integration and simplification in Mathematica

I am using Mathematica for the very first time, to evaluate the following integral, but I am not getting an answer. What is wrong with the script My code: ...
15 views

### How to fix EdgeWeights when a vertex is deleted from a directed graph (BUG?)

I have the following Codes (developed by @Mr.Wizard and @kglr, respectively): ...
14 views

### Computing the set of automorphisms of a non-simple AND multi-graph?

As the title says, we would like to compute the set of all isomorphisms between, possibly, non-simple directed multi-graphs. A related question is How to compute the automorphisms of graphs with ...
29 views

### Can a plotted graph be included with a Tooltip?

I have a set of spectral training data for 2 thousand plus colors. Right now each color can be compared with a result a ListLinePlot made to show both on a graph with RMSE. I would like to be able ...
26 views

### Comparing two equivalent definite integrals

Reading this question on Math.SE, I tried the following Mathematica instructions ...
43 views

### Why is there no heat being transfered in my program?

I have been working on this code and am new to this coding language. I have been trying to model the transfer of heat through a hot plastic being cooled in a water bath. For some reason I have not ...
88 views

### Finding closed or numeric value for $\int_0^{\infty } \frac{x \csc (a x)}{x^2+b^2} \, dx$

According to Gradshteyn 3.747-3 $\int_0^{\infty } \frac{x \csc (a x)}{x^2+b^2} \, dx=\frac{\pi}{2\sinh(ab)}$ $b>0$ so I'm trying to get some numeric results from Mathematica 12. ...
31 views

### matching Inequalities

Consider the following list list={0 < x < 1/12, 0 < x < 1/4} I wish to find the intersection of the two ranges of x ...
53 views

### The numerics of FresnelS[]

Bug introduced in 12.1 or earlier and persisting through 12.1.1 or later [CASE:4615361] Note: A worse problem existed in 12.0 for inputs greater than 8 and of ...
39 views

### Missing integration constants in solution to PDE

I am attempting to obtain the analytical solution (if possible) to the following: $$a w^{(1,0)}(x,t)+b w^{(0,1)}(x,t)=p(x)+g w(x,t)$$ $$I.C.: w(x,0)=0 | B.C.: w(0,t)=z(t)$$ ...
19 views

### Creating .wmv file using MathMF

I am trying to create a movie (.wmv file type) in Mathematica using MathMF. Here is my code: ...
27 views

### Error with Multiselection on ListPicker [closed]

I am unable to multiselect on the ListPicker, even on the examples in the documentation. It just single selects instead. I am using Version 12.1. Has anyone else ...
217 views

### How to solve this analytic geometry problem completely

I want to find a plane that passes through points {1,0,0} and {0,1,0} and is tangent to surface $z(x,y)=x^{2}+y^{2}$. ...
43 views

### How to get the modulus of two functions

I might be overlooking something, because what I want to do is quite elementary. I want the following term Mod[2(1 + z), (1 + z)] to evaluate to ...
27 views

### How to judge whether a single-variable function is differentiable at a certain point

Michael E2 solves the problem of differentiability of multivariate functions. ...
31 views

### Problem with MATLink use with Mathematica

After installing MAThLink I started its use in Mathematica: Needs["MATLink"] CommandWindow["Show"] OpenMATLAB[] I got the following output: <...
93 views

### How to find a numerical antiderivative with NIntegrate methods?

@JimBelk asked in Interpolating an Antiderivative how to find a numerical antiderivative. I gave an answer that uses NDSolve with the default method for integrating ...
20 views

50 views

### Is financial visualization broken? Can you run any of these examples or InteractiveTradingChart[] at all?

I can't run anything relevant to financial visualization in my mathematica installation, i found these interesting example but anything that use the trading chart is kind of broken. EDIT: I'll add a ...
35 views

### How to activate Manipulate controls

I have two notebooks NB1 and NB2. In NB2 I perform the following symbolic calculations: <...
58 views

### Imprecise 3D plot

I'm plotting the following figure: There are two issues: There is some noise around the edges of the section of the torus, see figure below The torus is not smooth enough (modulo rasterization of ...
38 views

I am using FormPage to generate a DateListPlot with the TimeSeries of "ConfirmedCases" by Country. The code which I am using is ...
58 views

### Adding z-value to mesh lines in Plot3D

I'd like to label the level curves of a scalar field according to their $z$-value. The below code (taken mostly from this answer to a very similar question, but which uses tool-tips instead of ...
45 views

### NMinimize: How to avoid solutions that do not satisfy constraints within a certain tolerance?

I just started to use Mathematica a few weeks ago. Using NMinimze, I would like to avoid solutions that do not satisfy certain constraints (although they "almost" satisfy them). Do you know ...
34 views

### problem facing while solving a coupled differential equation [closed]

I am trying to solve coupled differential equations, inside which I have a function which I am getting by doing NIntegrate. The code is shown below: ...
657 views

### How to enter a nuclear reaction?

Sometimes the simplest things are the most difficult, I need to make a presentation, and I thought to do it in Mathematica, I wanted to do a demonstration too, well...this is the Rutherford's equation ...
61 views

### Why Does Subsets[…,{n}] Unpack?

Assume list is packed. I expect Subsets[] is a structural operation because it depends on the number of elements, not on what ...
56 views

### How to calculate the second-type curve integral

I want to calculate the second type curve integral $I=\int_{L} \frac{4 x-y}{4 x^{2}+y^{2}} d x+\frac{x+y}{4 x^{2}+y^{2}} d y$, where $L$ is the curve $x^{2}+y^{2}=2$ (the direction is the counter ...
65 views

### Parameter estimation using LogLikelihood

I'm trying to understand Likelihood methods with parameter estimation in mind. To this end I am trying to construct small examples that I can play with. Let's say I have some data which I know (or ...
146 views

### Remove mesh triangles in contour plot

How do I get rid of the mesh in this contour plot? ...
61 views

### How to eliminate the list case by Eliminate` function

It is known that line L1: $\frac{x-a_{2}}{a_{1}}=\frac{y-b_{2}}{b_{1}}=\frac{z-c_{2}}{c_{1}}$ and line L2: $\frac{x-a_{3}}{a_{2}}=\frac{y-b_{3}}{b_{2}}=\frac{z-c_{3}}{c_{2}}$ intersect at a point. Now ...
62 views

### How to control the output of Polygon

In the documentation article for Polygon in Mathematica 12, there is an example with the input: ...
43 views

### check if a string is an element of a list of strings

I have a list of strings called words. I'm writing: "cat" [Element] words I was hoping to get a True/False output, but I just get the input returned to me. This is the output regardless of ...
I have a $300\times300$ symbolic matrix and I want to calculate its inverse matrix. It has been two days and Mathematica is still executing Inverse[T]. $T$ is the name of that matrix. Why am I ...