Questions tagged [mathematica-online]

For questions specific to the Wolfram product Mathematica Online.

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-2 votes
1 answer
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How to convert traditional form of piecewise output into input piecewise function? [closed]

I have an output in this form. Let's say the f[s_,t_]:=output; When I try to calculate points at s, t e.g f[0.1,0.1], the output is still the same instead of any point. but if I convert this output ...
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-1 votes
1 answer
67 views

I have a (4,4,4) dimensional array which are the distribution values. The x, y and z axis range are given. Can you plot 3d heatmap?

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1 vote
1 answer
38 views

Accessing directories and files Mathematica Online

How does one access folders of Mathematica Online for Import-ing and Export-ing? For instance, suppose I have created a folder ...
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  • 1,705
2 votes
0 answers
30 views

Editing stylized output on Mathematica Online

Suppose the output of Mathematica involves a square-root, such as shown in the image below, taken from Mathematica Online. If one copies the output and pastes into a new input cell, the content ...
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  • 1,705
-1 votes
1 answer
119 views

Integral $\int_{-\infty}^{+\infty}\frac{e^{-(x-\eta)^2}}{1+e^{x}}\,dx$ step-by-step solution

I am trying to solve the integral $$\int_{-\infty}^{+\infty}\frac{e^{-(x-\eta)^2}}{1+e^{x}}\,dx,$$ for $\eta \in R$. For example if $\eta=1$, the site gives that the integral equals 0.51, but I don't ...
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-1 votes
1 answer
96 views

Please help me insert this example into Mathematica to illustrate the transformation

Please help me insert this example into Mathematica to illustrate the transformation
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  • 3
1 vote
1 answer
100 views

Correct code for 4th differential equation

How to code and solve the following equation in mathematica. d^2/dx^2(x^2d^2u/dx^2)+b^2u=0
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  • 21
0 votes
0 answers
34 views

Manipulate with Show causing tiny graphics Image

When trying to do a Manipulate on a Show for a Plot the plot becomes so tiny you can't see it any more
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  • 1
1 vote
1 answer
90 views

2nd order differential equation

Can the given equation be transformed to the Bessel equation?. If yes, how it can be transformed then?. Y''(x)+a*Y'(x)+b^(2)*e^(2ax)Y(x)=0
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  • 21
1 vote
1 answer
104 views

Solution of a BVP by Means of DSolve [closed]

If we consider the BVP $y^{\prime\prime}(t)=\frac{3}{2}y(t)^{2}$ where $0\leq t\leq1$ and $y(0)=4$ and $y(1)=1$. Then its solution is $y(t)=\frac{4}{(1+t)^{2}}$. I have set the BVP above as in ...
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  • 169
1 vote
1 answer
129 views

Mathematica failing to simplify ratio of pi-notation finite products

I'm wondering if the following behaviour could please be explained to me: ...
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-4 votes
2 answers
156 views

Wolfram Mathematica Code please [closed]

Consider two natural numbers of two-digits, like 46 and 96. They have the property that by exchanging the place of their digits and multiplying the so obtained numbers, we get the same product; i.e., <...
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-2 votes
1 answer
73 views

how to find and b piecewise function mathamatica [closed]

how would i find a,b for how would i write this in Mathematica to get a and b
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-3 votes
1 answer
44 views

Proof: Ratio of Cauchy distribution [closed]

I have a problem that I have been struggling to prove. Can someone help me with proving this following question, please ? : Thanks
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  • 1
1 vote
0 answers
35 views

How to give constraints of two parameter optimization in Lagrange multiplier?

In the lagrange multiplier method, the equations are : f[x_,y_]:=x^2+y^2 g[x_,y_]:=6x+8y The range of x and y values are 0<=x<=0.9, 0<=y<=10. How can I give the mentioned range of values ...
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0 votes
1 answer
35 views

Why won't ChartLabel print the right country under the right bar chart?

I'm working on an assignment and I can't seem to print out the right country name under the right bar chart. What is the problem? Why does the second country only print out? Ignore some of the words (...
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  • 199
3 votes
0 answers
57 views

Using ColorFunction Rasterizes the plot

When I make a simple plot using ColorFunction, the Mathematica rasterize the plot. Is anyone else having this issue? Does anyone know a way to avoid this? ...
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  • 31
0 votes
0 answers
92 views

How to extract the numerical values in the tables

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0 votes
0 answers
48 views

Does Glow work during mouse-driven 3D rotations in Mathematica Online?

As specified in the documentation for Glow, the code Graphics3D[{Glow[Red], Black, Cylinder[]}] displays a cylinder that glows ...
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2 votes
1 answer
115 views

How we can solve heat equation with this particular boundary conditions (error NDsolve)?

Please I need help to solve this heat equation with this particular boundary conditions: This the Code I tried in Mathematica: ...
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0 votes
1 answer
57 views

How can I put a condition inside a condition in mathematica? [closed]

The first part I programmed in python, in the second part I transcribed some parts for Mathematica s1=3; s2=-3; s3=0; se=5; ----------------------------------------...
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1 vote
2 answers
117 views

How can I plot a hexagon inside this cylinder so that it is always in the same direction as the cylinder, no matter what the orientation is?

How can I plot a hexagon inside this cylinder so that it is always in the same direction as the cylinder, no matter what the orientation is? In addition, the hexagon must always be the same size as ...
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0 votes
1 answer
92 views

How to plot a hexagon inscribed on a cylinder in 3D? The cylinder is hollowed out in the form of a hexagon (Mathematica)

I want to plot a hexagon inscribed on a cylinder in 3D using Mathematica. Edit1: I would like to define its direction by means of a vector
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1 vote
0 answers
56 views

numerical integration of an integral with singularity

I want to compute the following integral numerically in Mathematica, $$ \int_{-\infty}^{\infty} dw' \;\frac{\Gamma(\delta-4iw') 4^{4iw'}}{(i(w'-1)+\epsilon)^{1-4iw'}} $$ where $0<\epsilon, \delta≪1$...
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3 votes
1 answer
355 views

How to use Mathematica with hardly any financial resources

I'm a student from Afghanistan and I like to use Mathematica to experiment with as a hobby. But I cannot afford it. Does any one know of a free option?
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  • 81
0 votes
1 answer
80 views

Plot a figure in cartesian XY coordinates in 2D using spherical angles

I have the following equations in $x$, $y$, $z$ coordinates: $x = R_0[f(\theta,\phi)\sin(\theta)\cos(\phi) + \partial_{\theta}f(\theta,\phi)\cos(\theta)\cos(\phi) - \partial_{\phi}f(\theta,\phi)\sin(\...
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0 votes
0 answers
44 views

How can Integrate of conjugate transpose in mathematica?

please help me to integrate this matrix in matematica: 0 ConjugateTranspose[u[x,t]] (u_x)[x,t]+I vx,t[x,t] 0 -ConjugateTranspose[u[x,t]] (u^(1,0))[x,t]-I vx,t[x,t] 0 0 0 ...
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1 vote
1 answer
64 views

Making boundary condition a variable in ParametricNDSolve

I would like to make where my ODE is evaluated at (not the boundary condition itself but rather the "x" value of the boundary condition) to be a variable in my code. I find that Mathematica ...
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  • 11
1 vote
1 answer
51 views

plotting the shade of a 3D shape on a plain | help

as part of my electromagnetic waves course I want to plot all of the fields in order to better understand the material, but I ran into a few problems in the process. for example: ...
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0 votes
1 answer
102 views

Plot streamplot for two stability point for Jacobian

I have two points (0,0) and (5,-5). How can I plot the stability phase diagram for these two points in a single StreamPlot in Mathematica by showing those points ...
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  • 11
1 vote
1 answer
166 views

How to find the intersection points of two 3D surfaces in Mathematica?

I have two equations consisting of two variables and I'm plotting those two functions in 3D by defining the range of the two variables. I need to find the points of intersection of these two functions....
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  • 13
1 vote
1 answer
48 views

Chinese remainder theorem large modulo [closed]

I have the following modulo congruences: x ≡ 0 (mod 2) x ≡ 2 (mod 5) x ≡ 21 (mod 41) x ≡ 16793129237622992703097532489897447320171386 (mod 648250901^5) I know, ...
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0 votes
1 answer
141 views

How to find variance covariance matrix using mle estimates for a given data in wolfram? [closed]

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1 vote
0 answers
96 views

Pollard's p-1 method in mathematica for large integers

I wanna factorize large integers using Pollard's $p-1$ method. My code is based on this: Factoring large integers with the Pollard p-1 method And looks as follows: ...
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0 votes
1 answer
86 views

One 1 minute (mathematica)

I wanna evaluate how large prime numbers my computer work at most 60 seconds. Of course, I can evalutate this manaully e.g. by trying different values. However, can I do this differently, e.g. by ...
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1 vote
0 answers
62 views

Difference between Wolfram Cloud basic and upgraded version

I am teaching a course this semester which requires the usage of Mathematica for doing simple analytical calculations. Now, our school doesn't offer Mathematica license for free. I checked out ...
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0 votes
1 answer
56 views

How do I find how many numbers are prime(taking absolute value of negatives) in a list? When i use count it returns zero

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 ...
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  • 363
0 votes
0 answers
59 views

Why is this correlation (seemingly?) wrong?

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1 vote
0 answers
12 views

How to create a denominator for division in Wolfram Cloud? [duplicate]

How to create a denominator for division, or other math objects like superscript for exponent, in Wolfram Cloud? In Mathematica you have the typesetting/characters window, or you can use Ctrl+/ for ...
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  • 73
3 votes
1 answer
207 views

How can I iteratively add elements to a list

Basically I want to make a histogram with a list of dates by using DateHistogram[]. However I have the data of the dates in nested list format, with elements like ...
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4 votes
1 answer
76 views

How to paste text with special characters into Mathematica Online

When using the desktop version of Mathematica, I can copy text from other applications (specifically, a block of data in a spreadsheet) and paste into Mathematica between ...
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  • 1,705
0 votes
1 answer
44 views

Finding limit of a function with more than one variable using mathematica [closed]

I want to find the limit as t approaches infinity of the function u(x,t) using mathematica. Can someone please help me do this?
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0 votes
0 answers
66 views

How to draw a figure of this complex equation using mathematica?

friends. I am learning an book and find this equation: E is the electrical field. The book shows the figure of this equation should be this: The x axis is w0-w. I want to draw this equation by ...
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  • 107
2 votes
1 answer
88 views

Plot GridLines not displaying

GridLines not rendering. Tried changing Background to White and GridLines to Black to see if they render at all but they do not. How do I make GridLines render and can these PlotStyles and settings ...
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  • 1,787
3 votes
0 answers
102 views

Mathematical Typesetting in Mathematica Online

Is there any way to insert mathematical typesetting into text cells in Mathematica Online? I'm a teacher and I want my students to be able to do their assignments using Mathematica Online and hand ...
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1 vote
0 answers
39 views

Alter maximum output size from Linux command line

I recently installed Wolfram Mathematica in a instance in Google Cloud using GPUs and I'm running it inside Jupyter Notebook, Python 3, using Wolfram Client library. However, big outputs, like a 400,...
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  • 149
2 votes
1 answer
91 views

Defining a sum on the elements of a matrix

I am interested in defining the quantity $$H=n-1-\sum_{i\ne j} R_{ij}, $$where $R$ is a random $n\times n$ Hermitian matrix (as a side question: how should I go about adding the condition $\rm{Tr}(R)=...
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0 votes
1 answer
55 views

how to solve a Partial Differential equations numerically of the kind given below [closed]

eq=D[f[x,y],y]+ f[x,y]/y == Q[x,y] The equation doesn't have any derivative with respect to x. If I use the following syntax for ...
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3 votes
1 answer
107 views

Getting a fimbriated plot

I use the online version of Mathematica. The function I want to plot is: ...
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0 votes
1 answer
169 views

How I can Normalize the below given PDF?

I have tried to Normalize the below Code PDF with a such Constant K But I didn't succeed , I have used this instruction: ...
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