Example:

`Solve[x^2 + a x + 1 == 0, x] Output: Hold[Solve[x^2 + a x + 1 == 0, x]] `

What is the problem? Any child can solve this in its head

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# Tag: Mathematica

## Why does Mathematica just return Hold of my Input?

## wolfram mathematica Display a map with a red dot in its capital

## How to install Linux for NRPy+, Einstein toolkit, Mathematica and Latex?

## Mathematica code for Beamer in LaTeX

## How to “open all” examples in local help pages for Mathematica 12?

## How to terminate login screen to Wolfram cloud without rebooting Mathematica itself?

## Can I use Mathematica ML capability to translate an image of a formula?

## Parallel installation of two versions of Mathematica on Linux

## Solving Heat Equation Problem in Mathematica

## Problem exporting vector graphics (PDF) in Mathematica Notebook Front-End using remote kernel on linux

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Example:

`Solve[x^2 + a x + 1 == 0, x] Output: Hold[Solve[x^2 + a x + 1 == 0, x]] `

What is the problem? Any child can solve this in its head

It is necessary to display a map of Russia, only with a red dot in its capital. I can’t do it

Graphics[{Gray, CountryData[“Russia”, “Polygon”], PointSize[Large], Red, Tooltip[Point[Reverse[CityData[#, “Coordinates”]]], CityData[#, “Name”]] & /@ CityData[{Metropolis, “Russia”}]}]

enter image description here

enter image description here

I need to use the following on my laptop:

- Einstein toolkit
- NRPy+
- Mathematica
- Latex

Which Linux version should I prefer? Which is the best way to uninstall my Windows 10 OS and turn to Linux?

I am trying to include a Mathematica code in Beamer. I tried `lstlisting`

and `verbatim`

environments but I am not satisfied with the outcome. A fancy way to include Mathematica code in LaTeX has been introduced here: Fanciest way to include Mathematica code in LaTeX. Nevertheless, this approach does not seem to work in beamer:

`\documentclass{beamer} \usepackage{soul} \usepackage{media9} \usetheme{Madrid} `

(above there is my pramble). Any ideas on how to include Mathematica code in a fancy way?

Sorry if this is easy to find, but I am not able to find it.

When I do `?DSolve`

and select `local`

help (this is new in V12), the help page that comes up says there are 157 examples. But below it only 2 basic examples are shown.

How does one open or see all 157 examples at once to browse them all? Clicking on `Examples`

only closes the basic examples page.

Is one supposed to manually open each link in the list below and search each looking for these examples?

Now if I select the `web`

version of the help, I see this on https://reference.wolfram.com/language/ref/DSolve.html

And it works. Clicking `open all`

it opens all examples there. I did not count there are 157 ofcourse, but at least all examples are on same page on the web.

How can one view all 157 examples of `DSolve`

in the local help page?

V 12, windows 10.

I wanted to try an example here NFourierTransform, so copied the example and pasted it into my notebook in my PC.

I get a popup windows asking me to login to the Wolfram cloud. I did not want to do this at this time (I do not even know if I have an account there, I need to check). So I clicked cancel. But it will not go away.

I am also not able to use any other notebook and do anything with Mathematica now.

This does not sound right. One should be able to cancel a login screen without being stuck. Is this really how it is supposed to work? Any workaround?

This is Mathematica v 12 on windows 10 professional 64 bit OS.

Notice if you try it, make sure to SAVE all your notebooks, as there is no way out unless you login to the cloud first. I lost somework myself due to this, since only option I found is to terminate the whole Mathematica process from window.

Also killing the kernel process from windows does not help. I had to terminate the whole Mathematica process. Which tells me this is a front end problem.

If I am given a pdf image of a mathematical symbolic formula can I translate it into Mathematica syntax using ML?

I tried using Classify, but I can only translate parts of the equation and I don’t know how do to group the pieces together. Moreover, I found the training set can not have an equal sign. [![I pasted an image because of the images in the training set

produce this output:

out[201]=ω/k

What is the proper way to install e.g. `Mathematica 12`

alongside existing `Mathematica 11.3`

? This link talks about installing Mathematica but it specifically says that the executable files will be placed in `/usr/local/bin`

thus if I install `Mathematica 12`

using the standard procedure, these files will be replaced.

I know I could place the `Mathematica 12`

executables elsewhere but that is not a neat solution, I would probably prefer renaming them such as to include the version or not even putting the links in `/usr/local/bin`

at all. Anyway, this is solvable using a different directory and then deleting it or some other way. Is there anything else that might get overwritten and I need to take care of it?

I’m brand new to Mathematica and was trying to solve this heat equation problem, but I keep getting back the input on the output line.

The problem:

Consider the equation $ u_t = u_{xx} – 9 u_x$ , $ 0\lt x\lt1 , t\gt0$ , with boundary condition $ u(0,t) = 0 , u(1,t) = 0$ and initial condition $ u(x,0) = e^{4.5x}\!\left(5\sin\!\left(\pi x\right)+9\sin\!\left(2\pi x\right)+2\sin\!\left(3\pi x\right)\right)$ . Solve $ u(x,t)=?$

My try at the code:

`heqn = D[u[x,t],t] == D[u[x,t],{x,2}]-9*D[u[x,t],x]; ic = {u[x,0] == E^(4.5x)*(5 Sin [Pi*x] + 9 Sin [2*Pi*x] + 2 Sin [3*Pi*x]), u[0,t] == 0, u[1,t] == 0}; sol = DSolveValue[{heqn,ic},u[x,t],{x,t}] `

The output is just a simplified version of my input.

What am I doing wrong?

I’m not being able to export vector graphics images (especially PDF) in a Mathematica Notebook Front-End in Windows 8.1 using a remote kernel on a Linux server.

I can, however, export Raster Image Formats without a problem.

One interesting thing to point out is the fact that when accessing the server directly via ssh command line, launching Mathematica kernel and executing the same `Export`

command, it works fine.

Mathematica 11.3 is the version being used on both computers.

**Example of a Mathematica Notebook:**

`SetDirectory["/home/results"] plt = Plot[x, {x, 0, 1}] Export["test.gif", plt] (*Works fine*) Export["test.jpg", plt] (*Works fine*) Export["test.png", plt] (*Works fine*) Export["test.pdf", plt] (*Does not work*) Export["test.eps", plt] (*Does not work*) `

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