All Questions

I have a set of linear homogeneous equations with 8580 variables. I want to estimate the time Mathematica takes to solve the system, by solving smaller sets of ...

I am interested in others' experience using Mathematica for machine learning and bioinformatics course curricula. Let me first say that I have been programming with MMA for almost 10 years now (out ...

Consider opening a web session such as (Mathematica 11.3) session = StartExternalSession["WebDriver-Chrome"]; ffoxdo[cmd_] := ExternalEvaluate[session, cmd]; ...

I have equation E^y = x. How can I use Mathematica to solve all of "y" from the desired "x" value. For example, I want to solve for "y" from x = 0.5 , 1 , 1.5 , 2 , .... , 9.5 , 10. The solution ...

I have these two equations: $$f(x)=(\cos(\frac{n}{x} \pi)\cos(x\pi))-1$$ and $$g(x)=\sin^2(\frac{n}{x}\pi)+\sin^2(x \pi)$$ where $n$ can be any integer. These two functions are what mathematicians ...

I am trying to solve the following system for d: ...

I'm plotting a surface using ParametricPlot3D. Ideally I would like to plot an intersection of the surface with a plane just as seen in another question (Cross Sections or slices of 3d figures - ...

I need to solve 4 coupled PDEs. Thanks to @xzczd's help, a few days ago I can obtain the solution of the first 2 equations with some proper boundary conditions, see this post. Now, these two equations ...

The model is a nonautonomous system $x'=(2+cos(2 π t))x -0.5 x^2-0.5$ and it can be transformed to the autonomous form by ...

I try to solve integro-differential equation for a function of two variables, where the initial conditions are given with f[s,s]==1. Mathematica does not like such an initial condition, as I get an ...

I would like to perform a change of variables on the following dynamics system: ...

I want to calculate the value of $\nabla\cdot\frac{1}{(x^2+y^2+z^2)^{1.5}}(x\hat{x}+y\hat{y}+z\hat{z})$. I used the following syntax: ...

everyone. I'm currently trying to calculate the centroids of objects using parametric equations and line integrals. I already have a program that can parametrize any shape accurately with a closed ...

I am wondering about the existence of Mathematica code to find (approximate) Steiner trees in graphs. I know there are a number of algorithms to do so --- just curious if anyone has implemented any ...

I have a long list (Table) consisting of "True"s and "False"s. I would like to identify the position in the list of the last entry that takes the value "False". Is there a way to do this?

I'm trying to solve a differential equation as in the following code: FullSimplify[DSolve[x'[t] == a + b E^(g t) + (c + d E^(-g t)) x[t], x[t], t]] which ...

I'm trying to solve a linear differential equation as in the following code: DSolve[x'[t] == a + b E^(g t) + (c + d E^(-g t)) x[t], x[t], t] which yields ...

Short version: My understanding of the use of TargetUnits in a Plot statement is that if the function being plotted has units, MMA will attempt to convert the output of that function to the unit form ...

Given that $$\frac{\partial u}{\partial t}=\nu\Bigl(\frac{\partial^2u}{\partial x^2}+\frac{\partial^2u}{\partial y^2}\Bigr)$$ With the following periodic boundary conditions: $$u(-\pi,y,t)=u(\pi,y,t) \...

With a dataset like: How can one take the top 10 items (largest by FileSize in this case)?

I am getting the following error when I set the target device as GPU: NetTrain::trgdevegpu: TargetDevice -> GPU could not be used; a supported NVIDIA GPU was not found. If you are using an ...

Let us say I have a plot, for example that one: Plot[x^2,{x,0,5},AspectRatio->5] and I would like to export it as a PDF in such a way that if I print the PDF ...

I want to be able to approximate a PDE, but my eigenfunction is an Interpolating function. Is there a way I can use an interpolating function as an initial condition in the PDE. For Example: ...

What is the most efficient code for the following formula: $y_{n+1}=\frac {2y_n-y_{n-1}+5g_n y_n+g_{n-1}y_{n-1}}{1-g_{n+1}}$ where $g_n$ is a variable. I have tried this code ...

Context: I'm studying adversarial attacks on neural networks. These attacks are grouped into targeted, where a legitimate input is changed by some imperceptible amount and the new input is miss-...

I am trying to draw a particular maximum plot within a simplex. I have functions based on two variables: Write p,q for the two variables where p,q \geq 0 and p + q \leq 1. This defines the simplex ...

After not using Mathematica 10.0.2.0 for a few months (I think since december 2018) on my MacBook Pro from 2013 (now with macOS Mojave 10.14.5) I am suddenly facing issues with ...

Hey can anyone tell me why this function isn`t working. ...

I want to use the following grid of Dynamic variables to set values for evaluations of expressions containing those variables. ...

I think I have not understood clearly the difference between dimension and shape. I want to construct a vector remembering recurrence of the type : ...

Consider a table ...

This is a PDE taken from a Maple document. Mathematica DSolve currently unable to solve it. I wanted to verify Maple solution using NDSolve. This is string of length 1, fixed on the left, and free ...

I have defined two functions as following: ...

I have following equations: $$\frac{1}{((a_1 - 1) f + 1)} + \frac{1}{((a_2 - 1) f + 1)} -k = 0$$ $$\frac{1}{((a_1 - 1) f + 1)} + \frac{1}{((a_1 - 1) f + 1)} + ... + \frac{1}{((a_n - 1) f + 1)} -k = 0$...

I am trying to code a while loop that uses AppendTo to append the loop variable to an empty list. ...

When trying to switch from version 10.3 to 11.3 I noticed that some of my code do not work properly. After some investigation I found that the problem is with pattern matcher. Here is the example: <...

I am trying to find an ‘elegant’ manner of expressing the need to solve equations of the form f[f[n]]=-n. I’ve been tackling this as a power series expansion but I ...

I'd like to check if all elements of a list are numbers. I've tried ...

Which groups exactly include the class "ComputedFiniteGroup" ? Help says "A finite group derived by computation", but it's not very specific. Moreover, the examples given in the help mostly show ...

I have a small query and a related problem regarding the working methodology of Mathematica under set delayed/Do functions. Here is a simplified version of my problem. ...

I want to compute the following probability. Assume that we have a Poisson distribution $P(k,t)=\frac{(a(1-s)^t)^k}{k!}exp(-a(1-s)^t$ with mean $a(1-s)^t$. While $0 \le a \le0.5$ and $0\le s \le 1$ ...

I use a C program to generate a ".txt" file, and import this ".txt" file into Mathematica to do some calculations and export these calculations. Due to limitation of data size in C program, I have ...

I am doing the following multi-dimensional integration using NIntegrate in Mathematica which is potentially divergent ...

I have seen some similar posts but could not quite find what I am looking for. I would like to create a 2D plot with discrete points that are color coded by a 3rd dimension value. The color ...

I'd like to set the color range for a set of ContourPlots within a Table. Please notice that the colors in the uploaded picture aren't the same from one plot to the other, (take a look to the ...

In this example Plot does not color each curve differently: Plot[{vx0 Sin[t], vy0 Cos[t]} /. {vy0 -> 1, vx0 -> 1}, {t, 0, 12}] but in this example it does: ...

Familiar example of sorting objects I have a list of $n$ "vectors" $\{x^{(1)},...,x^{(n)}\}$ of form $ x^{(i)}=\sum_{j=1}^m c_j^{(i)}x_j,i=1\dots n$, where $c_j^{(i)}$ are nonnegative ...

I typed in a long integral into Wolfram Alpha and asked it to integrate it however Instead of showing the result or even that it is unable to perform the task it totally ignores the function and only ...

I have the following c++ code that I want to translate to Mathematica. ...

Consider the following rectangular matrix M = {{1,1,1,1},{2,2,4,4},{3,3,5,5},{9,9,3,1}} I would like to extract the position of equal columns. Is there a simple ...