# All Questions

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### Approximating exponential generating function (EGF) from values of generating function (OGF)

I have a function that can evaluate ordinary generating function, and need to construct an approximation to the exponential generating function by using a few calls to the ordinary generating function....
• 6,837
53 views

### On a formula in Wolfram|Alpha [migrated]

I need to understand a formula for the Hypergeometric function $_3F_2(a,b,c;d,e;1)$ I searched and got the following from Wolfram alpha ( see:- second formula in https://functions.wolfram.com/...
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70 views

### Dsolve to find vector potential component's

I want to find the vector potential component's. I expand the Poisson’s equation in cylindrical coordinates which yields the three equations as in the picture. The equation along rho direction equal ...
• 1
112 views

### Plot the graph of an integral

If I have a system of differential equations, I solve it and save the result in Sol: ...
• 33
145 views

### Analytical Solution in Generalized Heat Equation

Given the following problem $$u_{t}-\frac{v}{2}\cdot u_{xx}+\frac{v}{2}\cdot x^2 \cdot u(x)=0$$ $$u(x,0)=f(x)$$ Where $f(x)=y_1(x)+0.2y_4(x)+0.01y_6 (x)$ $y_n$ are the Eigenfunctions that defined ...
152 views

### Sorting a list by a single particular element in a specified order

I have a list of lists -- a list of sublists -- that I wish to sort in a specified order. The following function, sortBy2ndElement, sorts a list of lists (...
• 9,747
404 views

### How can I properly plot this region, with some filling too?

I have to plot this region: $$A = \{(x, y)\in [0, 2]\times [0, 1]; x+y \leq 2\}$$ Here is what I did: ...
• 217
73 views

### Compiling a function that uses MapThread

I'm looking for tips on quickly applying the following update to $B$ pairs of $(w_i,x_i)$ $$\text{step}(w_i,x_i)=w_i-a x_i \langle w_i, x_i \rangle$$ Below is a readable but very slow version ...
• 6,837
95 views

### Splitting list into sublists based off string value [duplicate]

I'm new to Mathematica so please bare with me! I wish to split an imported data list off of {x,y} values based off the y value, and then sum the corresponding parts. An example of the imported list: <...
• 153
62 views

### One-way "cross" of function between two matrices

I'm trying to create a sort of one way "cross" of a function between two matrices, such that every pair in one matrix is mapped to every pair in the other, but not the other way around; for ...
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1 vote
32 views

### Hold around SetDelayed with Graphics [duplicate]

Minimum Working Example I've defined my own plot function, which does a lot of stuff to the inputs before passing it into the Graphics function. Because of that, I'...
39 views

### Non-minimal coupling ξ , Minkowski false vacuum decay case (shooting method) (An update to the previous question)

I asked a few days ago this question: Non-minimal coupling ξ - numerical bounce solutions (shooting method, false vacuum decay) Alex Trounev helped me improve my code building based on this paper (...
18 views

### Unknown Cell Collapse Type

Going through a notebook someone else put together, there are segments where a cell is mostly collapsed - you can see it is a code cell but not the code inside, but you can still evaluate the cell (...
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86 views

### Bug of ChoiceDialog

I am using Mathematica 13.1 on Windows 11. I have the following bug with ChoiceDialog: ...
• 5,112
23 views

### Building the documentation index in the cloud

How do I generate a persistent documentation search index in the Wolfram Cloud? Unlike in a local Mathematica installation, the ...
• 1
35 views

### Tracing the phases (i.e. the minima) of a potential

Is there a Mathematica package to trace the minima of a potential as a function of some parameter, returning its phase structure? Working with particle physics models (in the context of cosmology and ...
152 views

### Cannot Draw a Composite Piecewise Function

I have defined two functions: g, which is a piecewise function, and h, which is the composition of g. ...
43 views

### DSolve output displays different from actual output after using locator in Manipulate

V 13.2.1 on windows 10 If you look at this it does look bizzar, right? The same variable sol is different from what it should be above it. But the above ONLY ...
• 127k
34 views

### Retrieving the documentation search ranking in Mathematica

I want to write a function that takes a search term and returns a list of built-in symbol suggestions. The add-on function DocumentationSearchSearchDocumentation ...
• 1
47 views

### The shortcuts for typing subscript is valid

I installed the Mathematica 13.2 in my new computer， everything worked well excepted that the shortcuts for typing the subscripts "ctrl+ _" doesn't work. I tested that the "ctrl" ...
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224 views

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### Background color depending on external function value on the same plot

I would like to plot a two dimensional list (ListPLot [{x, y[x]}]) where the background color is changing with x value according to the value assumend by an external function f[x]. Thank you. Sorry, I ...
110 views

### Mesh Cylinder[{{0,0,0},{0,0,1}},1] with inner boundary x=y=0`

In a meshed cylinder Cylinder[{{0,0,0},{0,0,1}},1] I need to specify DirichletConditions along ...
• 42.9k
42 views

### Statistics Clarification [closed]

I'm learning pretty basic statistical concepts, and want to clarify that my understanding is correct. I created a drawing to visualize what I think is correct, and I need to know if this is right or ...
100 views

### Minimizing computational time for a quantum walk problem

Any suggestions as to how to speed up the computational time for this quantum walk problem which is coded using a normalized SparseArray coin operator as follows: ...
• 3,128
108 views

### Plotting Average Positions of 2D Random Walk

I need to generate a plot that shows the averaged position at n steps of 1000 different random walks that are each 1000 steps long. So far I am using ...
1 vote
50 views

### ContourPlot fails to plot a simple triginometric function squared [closed]

The two plots should be exactly the same in the following. However, the one squared gives nothing. I tried MaxRecursion, ...
• 4,564
124 views

### Entering matrices interactively

I am looking for a way to enter an m*n matrix interactively using a dialog or a Graphical User Interface(GUI). Further, I would like to use this matrix later for ...
62 views

### Why does ListPlot not plot all the points? [closed]

I have a list of {x,y} values that I want to ListPlot. Here is a shortened example: ...
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70 views

### List of parameters as argument for Manipulate

Let's say, that we have a list of parameters, that we want to use in manipulate, like so: parameters={{a,0,5},{b,-1,5}}; Of corse you could manually copy and paste ...
• 511
74 views

### Assume asymptotic value in a limit?

Is it possible to give Mathematica a limit about's function at infinity? For example I would like to ...
• 438
1 vote
53 views

### Fractional Differential Equation

I am facing the following problem. If u[x_,t_]=t+y[t]x, Then, D[u[x,t],t] Gives us 1+xy'[t]. But if I use the command for Fractional Derivative like FractionalD [u[x,t],{t,a}], then Mathematica print ...
1 vote
49 views

### NDSolve stops solving past a certain time

This is a continuation of the post I've made Unable to solve Delay PDEs Error in Boussinesq Approximation. I apologise if I shouldn't have posted a seperate question for this but I think that the ...
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