# All Questions

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14 views

### Plot defined function several times

I want to plot the partial Fourier series of a function. I have this: ...
6 views

### Hold outermost layer of expression

In pursuit of a function to force unsimplified fractions forceden[x_,d_]:=Hold[Evaluate[Numerator[x]d/Denominator@x]/d]; There are many related functions (...
6 views

### Opposite of “Extend Selection?”

I am trying to become more proficient with Mathematica shortcuts. To avoid using the mouse when folding a section, I am using Extend Selection CTRL+.. I press that ...
30 views

### Fast definition of sparse tensor

I'm defining a sparse array through ...
33 views

### How to add a keyboard shortcut to open a Palette

I would like to add a hotkey or keyboard shortcut to open a Mathematica Palettte, like e.g. the Basic Math Assistant. I found a ...
39 views

### Is there a way to add graphics to Show and keep the image “still”? [closed]

Let's say I'm writing a PDF presentation such that on slide 1, I want to show a sphere, and on slide 2 I want to continue showing the same sphere plus a point. I could draw these in Mathematica using <...
35 views

### Approaches to expression reduction

I am still learning how to use Mathematica more efficiently, but something that I keep bumping into is problems with it reducing formulas. Often, I'll ask it to compute a certain formula (take a ...
8 views

### I want an operation that keeps digits in order and result in a year number [migrated]

I remember a math teacher wishing us a good year with a mail title that was something like: 101 = (1 + 2 + 3)* 4 - 5*(6 - 7) + 8*9 Except the result was 2006. Is there a website that can find a number ...
15 views

### Is 8 a closed graph? [migrated]

As i say,is the number 8 a closed graph? And there are still a lot graphs partial the same feature.So,i just want to make clear the exact define of closed graph.
59 views

### Computing the sign of an expression

Can you please help with the following. I would like to compute the sign of an expression: ...
50 views

### How can I solve a system of PDEs with constraints but having unknown boundary conditions

I have a 1st order system of two PDEs with two independent variables and two dependent variables. ...
10 views

### Cannot assign to function call when looping through and converting excel files [closed]

With this code: ...
30 views

### How to express sum of rational functions as a single term [closed]

I have rational functions $\dfrac{q_1(x)}{p_1(x)},\ldots,\dfrac{q_n(x)}{p_n(x)}$ whose numerator I am trying to compute. I want mathematica to take the lcm of $p_1(x),\ldots,p_n(x)$ and express the ...
84 views

### Solving an equation with Reduce

In the equation shown in the code that follows, I must find or eliminate rb, but Mathematica is reluctant to work with my Reduce ...
43 views

### Export Vectorized Images

I read the answered question here which was for 7 years ago. I want to use DensityPlot3D function to draw a figure and save it as eps, pdf, or SVG as a vectorized ...
51 views

### Context Manipulation within Scoping Constructs

In the following the full context form of Test is not required as "Aaa" is added to ...
24 views

### Problem initializing xTensor package

I am using Mathematica 12.2 on Windows 10 and I am using the xTensor package for my tensor calculations. However, since today, I cannot run the xTensor package. I get the following error. Can anybody ...
29 views

### Pattern matching a monomial in n variables [closed]

I have monomials in the form $x \prod_{i=1}^n a_i^{y_i}$, and I want to return $\{x, \{y_1, ... ,y_n\}\}$. I'm hoping to have a pattern which would match a monomial of this form so I can return the $x$...
I am using FindMaximum to find the maxima and maximum value of a simple function $\sqrt{3-x^2}$ as follows: ...