All Questions

Using Wolframalpha or inline free format you can obtain a nice representation of a sum of vectors. An example is shown below. Whish is the hidden code? (or a code that make the same representation). ...

How can I plot the nonlinear difference equations? I try to use the continuous code but I do not know if its work with difference StreamPlot[{x+ .01 (0.4(x^3) - .2 (y^2)x + 1.1 (y^3) y+.01(-9x^3+9xy^...

I'd like to write a ExportString for Grid and/or TextGrid with basic style elements into Latex tables. I would it at least ...

I am completely new to mathematica. I am not sure how to calculate the expression 2F1. Is it possible to a closed form solution in terms of z of the hypergeometric series 2F1(-a, N/2-a, N/2; z) and ...

I am having trouble calculating some unpolarized squared amplitudes with FeynArts+FormCalc and want to use FeynCalc to manually handle the amplitudes calculated by FeynArts. What is the easiest way to ...

I want to solve the chemotaxis mode, given by the next non-linear system: It is taken from Murray's book: equation (11.30) at pag. 408 $$\frac{\partial n}{\partial t} = D \frac{\partial^2 n}{\partial ...

I have been working on a problem where I wanted to stack multiple graphs on top of each other in the following format I tried to look for solutions to do the same but I could not. The closest I could ...

f = 9x^2 - 78x-10000 list1 = PrimeQ[Abs[f /. x -> {Range[1, 20]}]] Count[list1,True] This is my code. Im trying to find how many prime numbers ...

I have a casual question about tips and tricks for parallel computation in Wolfram. As far as I know, Wolfram doesn't exploit both your CPU cores and you need to code for parallelization. How does it ...

There are already related questions to this one, but I could not transfer these solutions to my problem. I have the system $\sqrt{t_1^2+u_1^2}+\sqrt{t_2^2+u_2^2}\leq 1$, $x=2t_1-u_1+2t_2+u_2$, $y=...

I want to apply the function Tdec in Feyncalc automatically. Here is an example what the input is: ...

I am trying to input $$g_m=\sum_{m=l_1+l_2+...+l_r\\p_i~distinct~odd~primes\\such~that~p_i|l_i}\frac{1}{\Big(\frac{l_1}{p_1}\Big)!...\Big(\frac{l_r}{p_r}\Big)!}$$ Now here factorials are involved and ...

With the following code I try to calculate the steady-state equilibrium waiting time at two different queues. A fraction tau of users turns away entriely, a ...

If I want to have a variable name that contains multiple numbers but where it is important that the numbers be separated I would usually use underscores (as in C, e.g. p_3_23), dashes or dots (for ...

I have a image which I want to fit 2d Gaussian function with that. I used the below codes but the output figure doesn't look alright. I extracted the mean and covariance values in x and y direction.I ...

I want a rule that would transform, for example, And[i,F[j,k],l,G[m,F[j,k],n],p] into And[i,F[j,k],l,G[m,T,n],p], where ...

I am trying to find (some) functions h(x,t) such that A h(b,t)+B h_x(b,t)=g(t), where A,B,b are constants and g(t) is a given function of time (h_x is the partial derivative w.r.t. the first component ...

I did a classification using Classify. I sampled 20 times. To calculate the mean accuracy, etc., is easy. But is there also a way to overlay the calculated ROC ...

I've a few python data types ...

I am trying to write a program that forms the interpolation polynomial for a given function on a given interval for any number of data points n. I wish to write a formula that will compute all of the ...

How to build a table that counts how many times each element in mainlist occurs in lst1, lst2, lst3, lst4 and which lst1, lst2, lst3, lst4 contains that element. For example, in mainlist, element ...

Is there any way to multiply certain terms within a vector with a constant? e.g. assume that I start with a vector {f[4] - g[-1] , h[2] , 2 * g[2] + h[-1]} where f[ i ], g[ i ], h[ i ] are functions ...

Considier the remainder of the first $2500$ prime numbers by the numbers from $3$ to $30$, included. Calculate how many primes are in each remainder class. That is, create a list that for each number ...

I want to use Mathematica to draw spacetime diagrams. In particular, on one of these diagram, I'd like to draw two pairs of axes. The first pair $(t,\,x)$ for the rest frame and the second pair $(t',\...

In a recent posting, TwoQubits user JimB, employing a change-of-transformations put forth by N. Tessore, was able to confirm a formula for the "two-qubit absolute separability Hilbert-Schmidt ...

If I have a table of data and I want to do a specific operation on say the third column, I usually do something like this: ...

I am trying to segment a binary image into three parts, head, body, and tail. The binary image is a stack of tiff files of a moving fruit fly larvae. I was able to do this initially by removing points ...

Lets say I have the following input: rn={ {1, 1.1, 1.5}, {5, 6, 6.1, 7}, {8, 8, 12, 12, 12.5, 13} } This input has the dimensions of ...

How can I simplify the following equation with Mathematica assuming z!=0? I have the following code: ...

Preamble Run this code in the preamble for a working example of what I'm dealing with. Census Tract Entity Store ...

I have the following code: ...

I use Graphics[{EdgeForm[Thick], LightGray, Rectangle[], {Black, Text[Style[F, FontSize -> 442, Bold, FontFamily -> Arial], {1/2, 1/2}]}}] to put an "...

I am trying to find a sloution for the following application. I have a centre of gravity (CG) and want to revolve a tube (telescope) around it. CG is 480mm from the vertex that corresponds to a ...

This is an example to make Pi in 3D dimension Thanks @xzczd for providing the fast version. Link Smoothing the Region？ ...

Suppose $A=\sqrt{\mathbb{Q}}_{>0}$. We want a unique $\bigcup\limits_{i\le j}A_i$ for $i,j\in\mathbb{N}$ such that $A_i$ is finite, $A_i\subseteq A_{i+1}$, and $\lim\limits_{j\to\infty}\bigcup\...

The problem is to plot the 3D Sinc function, but I cannot avoid the self-projection. I use the following code: ...

$$b_n=\sum_{m=2}^{\lfloor\frac{n}{3}\rfloor}\left\{(-1)^m\frac{l_m}{m+1}\sum_{i_1+i_2+...+i_m=n}a^{(1)}_{i_1}a^{(2)}_{i_2}...a^{(m)}_{i_m}\right\}$$ The $i_k\geq3$, for any $k$. Here $a^{(k)}$ ...

First, the objective is not to use formulas for combinations, or permutations. The objective is to use loops(for, while, etc.) to make Mathematica count the number of possible variations/sequences of ...

Integrate[Tan[3 x]^2, x] Why couldn't it simplify the answer to -x + 1/3 Tan[3x] so to speak

I am attempting to generate a plot for which the color changes for selected values of x as determined by a function. Below, is my best, unsuccessful attempt. The specific problem with this is that it ...

I have to form a matrix like this. How ever I can not directly input. I have to form a function and then use the table command. I am stuck. {{2,5,10},{9,12,17},{28,31,36}}

If I have three equations nonlinear. I need to see the behavior around (0,0). How do I plot the three-dimensional system? Thank you in advance. I try to use this code ...

Based from the equation I used in the code below, I found how many values are divisible by 5. However, this is in boolean form. I only know how many are divisible by 5 which is 7500. I need to ...

Is there an elegant way to start with a matrix of the form $$ A = (B,C) $$ where B and C have dimensions n x m, and construct a large matrix that looks like $$ \begin{pmatrix} B & C & \mathbf{...

First of all: this is question lies in the context of Surfaces and Embbedings on differential geometry. More precisely in the context of Kruskal coordinates and how to plot a 3D dynamical ...

I have physical equations of motion that describe the dependence of one vector field on the components of another vector field. Without getting too much into detail, my differential equations involve ...

I have this code: ...

What does the {-y,x} in this equation mean? .5 {-y,x}/(x^2+y^2)

I'm trying to set up code that basically asks the user to input the values of a matrix with a certain key size. I want them to first enter the keysize and then ask for all of the entries necessary to ...

I have a problem with a while loop in Mathematica. I want to run the whole list "mFromAlice" in the while loop but I dont know how to do that. It works with the first row, which is named x ...