All Questions

Let $A$ be the following matrix A = {{1, 0, 9}, {5, 0, 6}, {4, 1, 9}, {7, 0, 11}, {8, 1, 2}} and let $B$ be the matrix that comes from $A$ with ...

I have an equation of the following type: $$f(z) \overset{!}{=} a f_a(z) + \sum_{s=0}^\infty c(s) f_c(z,s)\tag{1}$$ where I know $f$ numerically and $f_a$ and $f_c$ analytically (they are long, ...

My code is below, ...

This just drives me crazy: Suppose I have a label label that I want to put on top of a Graphics (or any other Mathematica object ...

Is there any way to define the matrix M that achieves the following equation? the two defined matrices are ...

Edit: I have made some progress using the ?NumericQ replacement mentioned here optimization problem with NDSolve however this does not completely solve my problem. I have managed to find a new minimal ...

In Mathematica 12, I only see the option to define "PaddingSize" for a ConvolutionLayer in order to get Dirichlet boundary ...

We want to plot data on a log scale, so we used the loop over data on a log scale. E.g. the code is below, ...

V 12.1 on windows 10. I am still learning how to use Associations. This is very strange. I wanted to change field in association using AssociateTo. When the ...

I am interested in defining a function, say $\mathrm{Tra}$, that imply operators without build-in meaning, say it involves products with the $\cdot$ (Esc . Esc), ...

I have two matrices. ...

I'm having problems regarding to the following code: ...

Recently, I am trying to solve a 1-D PDE with a nonlinear boundary condition using the function NDSolveValue. However, it seems that MMA (12) cannot solve it directly with some computational issues. ...

I have the following code: ...

Abstract This is just a learning exercise for me. I am trying to create a function that will take a list of vectors, multiply them by a constant if constant is given, and then add all vectors. If we ...

I am trying to solve the Stokes equation for fluid flow in a 3d cylinder. All boundaries are no-slip, apart from the top boundary, which enforces flow in the x-direction. My problem is that I can't ...

V 12.1 on windows. I use Associations allot as input for my dsolve solver I am writing. I do not use Dataset, other than to ...

I need to print a 2D contour and 3D free energy landscape from an (.xpm) from Gromacs I obtained the free-energy-landscape.txt from the .xpm using the python script referred by this course. But when I ...

I have a few fairly complex parametric equations that describe a linear-log 2D graph which is unable to be described simply (in non-parameterized format). For various ease of calculation purposes, ...

I am trying to write a Kalman Filter for airplane radar tracking, so I generated testing data and now I want to add some white noise to this data. I have tried doing this, but it didn't help. So far I ...

If I have the following code: ...

I used Mathematica/wolfram 12.1 IDE and installed CUDA toolkit 10.2. All installed correct. I try to use library CURAND with #include with random integer generator on CUDA, but get a error: ...

When I run ParametricPlot[{g, r}, {x, 0, 250000000}], where the output values for function r are expected to always be extremely ...

I would like to calculate the integral $$\int_0^{2\pi} dx \sin^6\left(\frac{x}{2}\right) F\left(\frac{4-n}{2}, \frac{4+n}{2}, \frac{1}{2}, \cos^2 \frac{x}{2} \right)^2$$ where $F$ is the ...

I'm doing a problem of maximizing a function (BR1) that is based on another function (BF1) and its graphical representation but I get the error "NMaxime: The function value 1.7823 + 0.535011i is not a ...

I would like to compute Erf[80/3] to enough precision to know the order of magnitude of 1 - Erf[80/3] How can I do that? I ...

Edit Based on comment from Henrik Schumacher it seems I've managed to localize the problem. Speed penalty is observed only when WM is launched from terminal (tested on ubuntu 18.04, wm 11.3 and 12.1),...

I want to calculate the determinant of a matrix which coeficcients are polynomials. Explictly, the matrix is: ...

I have a list given as: d={{{1,1,1},{10,10,10}},{{70,70,70},{51,51,51},{97,97,97}},{{7,7,7}}} Each number in the list represents a potential "W" value for the ...

I am attempting to solve a double integral $$I(t) = \int_0^t dt' \int_0^{t'} dt'' f(t'')$$ of a piecewise function of the type $$f(t) = \begin{cases}1 & \text{for } 0 \leq t < a \\ -1 & \...

I need an operation $\tilde{}$ that lifts another operation (for example, the sum, but this does not have to be limited to real numbers) in the sense that $\widetilde{ (x \oplus y)} = \tilde x + \...

I want to solve a pde on a triangular domain, such that you can't leave the domain (which I think would just be Neumann boundary conditions). My pde takes the following form: $\frac{\partial}{\...

I have two graphics for a visualization that both depend on the same parameter (an angle). I'd like for both graphics to be controlled by the same slider, but I can't have the graphics overlay each ...

As you can see from the image below, when I plot 3D surfaces, regions, etc, they render as though there was no light source (left is Mathematica's help documentation, right is how it renders for me): ...

I have a pair of 3D parametric curves: ...

I am trying to specify a user-defined probability distribution with ProbabilityDistribution and am running into errors when I try to obtain the distribution ...

Suppose I have two functions $f,g$ given by f[path1_] := Drop[FoldList[fr[#1, #2] &, 1, path1], 1] g[path1_] := Drop[FoldList[fr[#1, #2] &, -1, path1], 1] ...

I am new to Mathematica and I tried to make a superimposed plot of a curve on a half sphere and need help with some graphics. This is the code line that i used to generate the following graphs <...

I have the following code to evaluate the double integral of which the integrand contains summations. ...

I'm trying to open a Mathematica Notebook, but I'm getting error 3,284. Mathematica asked if I want to open it as text, but the notebook still doesn't open. The file is over 1Gb, but I've set the ...

There is a figure given that shows the relation between Forward current(y axis) and forward Voltage (x axis ) for a forward biased diode, with the given formula $$If(forward current)= I0*e^{(k*q*T*...

I draw a plot as follows: ...

I have a very simple question. How can I enter and solve the following equation in Mathematica? thank you for your help dv/dt = ds/dt dv/ds A supplementary question on the same subject. What is the ...

I want to multiply rotation matrices (Euler matrices) that are expanded in Taylor series to a different order. When I use Series on the separate matrix, the multi-...

I have the following lines of code: l={1,2,3,4,5} n=5 Summation= n l Total[Summation] I would like to perform the same thing above, but in a more elegant ...

I am trying to 3D-Plot a constant Vectorial Field: ...

The following code M= 5/10; A = ImplicitRegion[0< x < M, {x}]; RandomPoint[A] gives a random decimal $x\in(0,M)$. How can I get an exact fraction ...

I have a base function of a crane that i am studing and i am trying to minimise the error of the load block to make it as straight as possible. I am using Nminimize for that, and while the code is ...

How would I go about plotting a single point in the $x,y$ plane given by; $$\left(\frac{\lambda d -b\mu}{ad-bc}, \frac{a \mu -c\lambda}{ad-bc} \right)$$ Where we can take $a,b,c,d,\mu$ to be positive ...

I'm trying to have a 3d plot for a complex polynomial using the ContourPlot3D It shows me a plot which does not vary when the input values of different variables are varied. So, I guess it is just a ...