# All Questions

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### Generating a thick spherical gyroid object for 3D printing

I have the code for the spherical gyroid as shown below. My problem is when I attempt 3D printing, I can not obtain the object because the thickness is too small. How do I increase the thickness of ...
132 views

### Incorrect result by DSolve

For real $x$ consider the trivial equation $$|y'(x)|=-|x|.$$ Since the left side is always positive and the right always negative, there is no solution. Let's try ...
106 views

### Combining two plots with different x-axes and not labeling the x-axis

Below two figures are just for example. What should I do if I want to plot the two figures below on the same plot with the same y-axis only that the x-axis is also same but not labeled such that. As ...
96 views

### Difference between MTensor and MNumericArray in Mathematica

Since I'm starting to look into C-programming using LibraryLink to connect Mathematica to computational expensive calculations, I was wondering about the two available options within LibraryLink for ...
25 views

### recursive time dependent NDSolve calculations but full kernel

I would like to make a very long time dependent NDSolve calculation, but the program indicates a full kernel after a while. How can I make the calculations by steps, saving the results at ...
75 views

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### How to obtain a Region from a numerical (!) function

I'd like to achieve a Region from a purely numerically defined function. Like this one: ...
67 views

### Allowing choice between If statements in user-friendly way

Is there a user-friendly way to get a Mathematica notebook to choose between If statements according to the value of a variable? I would like the user to be able to ...
29 views

### Finding/Printing Variables that Correspond to the Maximum Output of a List

I am very new to Mathematica and been having a problem that is frustrating because I feel that there must be a simple solution which I just can't grasp. Essentially, I am looking to automatically ...
39 views

### $MaxPrecision doesn't work I want to set MaxPrecision low, to like 2 decimals, but after I set it, it stays at 5 regardless. I've tried using two commands: ... 1answer 93 views ### Sorting Eigensystem According to Complicated Rule I have looked for an answer to this but the near duplicates I could find seemed slightly distinct. I have a matrix$A$which has eigenvalues in pairs$\lambda_1,-\lambda_1,\lambda_2,-\lambda_2,\dots$. ... 0answers 41 views ### Solving quadratic eqaution with many parameters It seems like Mathematica or my PC has problems to handle long equations: ... 1answer 31 views ### Problem evaluating numerical value of MeijerG[] function at some parameter? I need to evaluate this sum: Where x = 33.6614 and$k,l,s$are non-negative index of the three sum. For example$k,l,s=0,1,2,3,...$. Furthermore,$M$is a positive integer that is$M=1,2,3,4...$... 0answers 30 views ### Exponential simplification in Refine, Simplify and FullSimplify These lines are the MWE of a bigger script ... 1answer 33 views ### How to make sure the answer is limited to Positive Reals? As the title described, there is code: ... 2answers 325 views ### How to recreate this image warping effect? I'm looking to create image warping effect that looks like this animation, which resembles a misshapen magnifying glass being moved over a background: Not sure where to start, but here are some ... 0answers 113 views ### Why 99.998474% instead of 100%? I want to export a red square to the SVG file Export["red_square.svg", Graphics[{Red, RegularPolygon[4]}]] I noticed that in the exported SVG file, the ... 2answers 144 views ### Subtract peaks from curve If I have the following data: https://pastebin.com/2jgDw4iQ which plotted using the following code ... 0answers 51 views ### Referring to matrices with index For exampe I have two matrices, with index 1 and 2 Mat[1] = ConstantArray[0, {2, 2}] Mat[2] = ConstantArray[0, {2, 2}] I wanna assign new value with ... 2answers 170 views ### Exporting image and scale Let us say I have a plot, for example that one: Plot[x^2,{x,0,5},AspectRatio->5] and I would like to export it as a PDF in such a way that if I print the PDF ... 1answer 2k views ### What's the deal with next generation Wolfram compiler? Sources: Old Compiler (Rob Knapp Nov2011) Computer Science in Mathematica (Abdul Dakkak Dec2014) Compilation Technology (Tom Wickham-Jones, Abdul Dakkak & Steve Wilson Dec2015) The Wolfram ... 1answer 39 views ### VectorPlot and VectorPlot3D showing blank output I am trying to plot the following simple vector field $$\sqrt{4-x^2-y^2-z^2}*(y,-x,0)$$ but when I plug this field into the functions VectorPlot and ... 1answer 179 views ### How to deal with Polyhedron as region? I'm quite new to Mathematica and have big troubles with understanding regions correctly. Especially when using the function Polyhedron I'm completely stuck. According to the documentation, the ... 1answer 36 views ### Replace Table with a fast matrix operation to create for matrices A, B the tensor (b_{ij}A) and similar questions I have two (nxn)-matrices A=(a_{ij}) and B=(b_{ij}) and I'd like to create the (nxnxnxn)-List C=(b_{ij}*A) so e.g. ... 1answer 46 views ### Remove complex part of a solution I have a function intSL[a,zl,zh] where I want to compute its derivative with respect to zl given some values of ... 1answer 39 views ### Creating chart labels of two different Manipulated data sets in BarChart I want to add chart labels to different datasets that are chosen via manipulate. I have a hierarchical data set that I imported from excel and broke down into subgroups using nested associations. ... 1answer 83 views ### Force results to be displayed in a way often seen in traditional math [closed] I want to get my output in the form that I would write by hand. I have tried with TraditionalForm, but it did not work. I've looked at several answers in this SE ... 2answers 83 views ### Estimation of the expected Euclidean distance between two random points on a unit$n$-hemisphere What is the best approach to estimate, with Wolfram Mathematica, the expected Euclidean distance (in a$(n+1)$-dimensional space) between two points selected uniformly at random on a unit$n$-... 1answer 55 views ### Derivative of a set of equations [closed] I am a new learner of Mathematica, I think this question should be simple, but I just can't get the correct answer... This is my equations: p=x+y q=2x+y r=p+q And ... 2answers 187 views ### Newbie PDE Question I downloaded Mathematica trial in order to try to solve a PDE that Matlab symbolic couldn't handle. I don't know all the bells and whistles but going along with online documentation. I am trying to ... 1answer 84 views ### How can I make PlotRangePadding working properly? I am using the option PlotRangePadding -> None to make the curves exactly cut at the specified PlotRange and thus at the ... 0answers 42 views ### Integration using the change of variable formula [closed] I am working on a project for my multivariate calculus class that is focused around using the change of variable formula to manipulate integrals in Mathematica, and I had some questions: How do you ... 1answer 57 views ### Hiding the result of a calculation in an interactive panel until all the inputs are entered I created a partial fraction calculator using the Mathematica command Apart. The image below displays the value 1 before the numerator and/or denominator are entered. How can the code be fixed so that ... 0answers 37 views ### Solve a linear system using the substitution method [closed] I know that, for the substitution method, I have to isolate the first variable, plug the equation for that variable into the other equations, simplify the new equations, isolate the second variable, ... 1answer 74 views ### WolframAlpha can't prove$x^{2n} - 1$is divisible by$x + 1$[closed] I'm trying to prove that $$x^{2n}-1$$ is divisible by$x+1$for$n \ge 1 $and$ x \ne -1$. I got stuck so I turned to WolframAlpha, which fail with the reason being$ (x^{2}-1) \: mod \: (x+1) \: != ...
I am trying to solve the following coupled system of stochastic differential equations: $\qquad \dot{x}(t)=y(t)\,\eta(t)$ $\qquad \dot{y}(t)=x(t)\,\eta(t)$ $x$ and $y$ are functions to be solved for ...