# All Questions

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### How to convert this equation to a second order one in f?

This is a third-order differential equation. Is it possible to convert it to a second-order one by integrating it or any other way? I think it could be done by multiplying by some additional factors. ...
34 views

### Division algorithm problem that need to be solved by using procedure [closed]

My problem is; Write a procedure which finds the quotient and remainder of the division algorithm applied to two integers a and b. How can I use Floor to solve ...
53 views

Given: ...
286 views

### How can I solve the Ramanujan problem by using Wolfram language? [closed]

The problem like this: find all integers n, 1 ≤ n ≤ 10, 000 such that n is the sum of two cubes of positive integers in two different ways. I want to solve the problem as a procedure in mathematica.
28 views

### assigning integers to inner lists

Consider a asymmetric list which has been obtained from a NSolve command ...
70 views

### Using the Range function with the Slot (#) function

I am writing a code to display longitudinal waves. I started with the following, filling the slots using the Range function. ...
33 views

### Trying to extract the Eigen values and Eigen vector of a matrix

I have a Matrix A, which is a function of ω. I wanted to find the eigenvalues and eigenvectors of this matrix, how to do it. I have used the EigenSystem function ...
39 views

### How to get Thick and Black contour line in 2d list contour plot?

I am trying to make contour plot of a 20*20 matrix using the function ListContourPlot. I want the contour curves to be thick and black at the same time. So I tried ...
40 views

### Trying to define a function using indexed variables

I have a list of indexed variables, for example xx={x[2],x[4]} and an expression which is a function of those indexed variables, say ...
39 views

### Simulating a bicycle going around a circle

I want to simulate a bicycle moving around a circle. Instead of graphs and calculations, I want to almost see an actual simulation of this happening. How could I do this? I tried looking up ...
53 views

...
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### Deleting numbers from a list based on another longer list [closed]

I would like to delete all elements of a list that are equalled to any element found in a bigger list. For example, if I had A = {1,2,3,4,5} and B = {2,4,6,8,9,12} I would like to get C = {1,3,5} ...
33 views

### Extracting values from a dataset column based on key from a different column

Take a small dataset, for example a sample of the Titanic data: ...
65 views

### Is there a (simple!) way to convert all initialization cells of a document to normal cells?

I like to work with initialization cells. During the different stages of development of my notebooks, I however often need to change those. If they are scattered throughout the notebook, it is ...
61 views

### Reduce to Piecewise

There are some similar posts on SE, but none of them seems to exactly address my issue. I need to integrate a rather complicated function (over $x>1$) separately over two domains defined as ...
840 views

### Flatten an array

I have obtained an array of results as follows ...
24 views

### I can't exit Full Screen when I am pressing F12 [closed]

I use Dell Inspiron 15-5577. When I am holding F12, the screen just brighten. The software version I use is 12.0.0.0
29 views

### Sets of k expressions, being k a variable

I need to write something like Table[Subscript[A,i] = i, {i,5}] in order to define a set of expressions. All is OK with this, but if I try to left the number of expressions as a variable k... Table[...
86 views

### How to get the nth value of a function with arbitrary number of arguments

I know that I can define a function of a List and get the nth argument like: f[x_List]:=x[[1]]+x[[2]] What if the argument of ...
27 views

### Are these TransformedDistributions identical?

If A1 and A2 are independent random variables, and B1 and B2 are as well, then are the following TransformedDistributions the same? ...
26 views

### Printing problem Mathematica v12

After installing MMA v12 (Windos 7) I cannot print (using Print) on several printers, which work fine together with other programs. If a use ...
38 views

### Error using MaTeX, MaTeX::texerr : LaTeX Error: Missing \begin{document}

I've managed to install MateX with all prerequisites. pdflatex and GhostScript paths are correctly specified. I am able to load it into Mathematica. However, a simple command such as MaTeX[x^2] gives ...
28 views

### Changing Vertex Color and Coordinates From a list or vertex

I'm making a visualisation of an email network of a company. Each vertex represents a person and vertex color represents their position(BOD,CEO,manager,leader). The edges' Thickness according to ...
23 views

### How to select multi vectors with particular condition

I have a matrix as: a01={{225., 1, 2, 3, 4}, {225.5, 2, 3, 4, 5}, {226., 3, 4, 5, 6}, {226.5, 4,5,6,7}} And I want to choose head: ...
28 views

### Mmma connectivity . parquet. python

Is there any way to exchange data in binary format with python ? Example. a) I have data in Mmma and want to export them to make use in python ... b) Want to use Parquet format
117 views