All Questions

I would like to use Mathematica to show that $(AB)^{-1} = B^{-1}A^{-1}$ I used ...

From my plot, I see that my transcendental equation $f(x)=0$ has roots near points $\lbrace0.2,0.3,0.4,0.5\rbrace$. Unfortunately, using function FindRoots with ...

I would like to evaluate the expression $f(x) = \sqrt{x+2} -\sqrt{x}$ with cases when $x = 3.2 \times 10^{30}$ and $x= 3.2 \times 10^{16}$. I tried using ...

So I have problem for specific formula to create Quadratic_form form from $$y = 3 + x_1 - 2 x_4 + 2 x_3 x_4 + x_2 (-x_3 + x_4) $$ as matrix \begin{bmatrix} 1 & 0 & 0 & 0 \\ ...

So, I got this code: Plot[Piecewise[{{3, x <= 0}, {x^2 + 1, x > 0}}], {x, -2, 2}, PlotStyle -> {Purple}, Axes -> False, Frame -> True] and I ...

Let us execute in version 12.0 Integrate[DiracDelta[x]*DiracDelta'[x], x] DiracDelta[x]^2/2 and this lasts at least since version 7. However, the ...

HermitianMatrixQ seems to ignore a variety of ways I tried to help it get the right answer. For example, ...

I am trying to solve the z-transform of the following sequence using Mathematica: x[n]=-a^n u[-n-1] The known result is $X(z)=z/(z-a)$ with ROC: $|z|<|a|$. ...

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My problem regards solving a differential equation and can be reduced to the problem of finding $f(x)$ such that $\frac{df}{dx}=\frac{dh}{df}$, with $h(f)$ a known function. I have this list of data,...

I have a list of the form ...

On the United Parcel Service website(UPS) there is a form where you can enter a zip code and it will return a color coded map that shows shipping times from that zip code. I am trying to use ...

I would like to pick a part of a boundary mesh, for example bm=BoundaryMesh[Cuboid[]] Is it possible to select the part(side) ...

I was trying different colorfunctions, but don't get the RedLevel like the picture as follow: My picture is like this, a greylevel one.

[ I know how to make finite tree plot(small row numbers), but how can I make this thing continue to 100 rows? Thank you very much!!

I am trying to solve this integration : Integrate[(1 - Exp[-a*x])* (1 - Exp[-b*x])*(1 - Exp[-c*x]), {x, 0, t}] I get the result. But when I use the below ...

I want to solve these equations for "r" and \theta. But, mathematica is unable to produce output. Can anyone help me please to find the values for "r" and \theta? Here, "k" can be fixed by 0.75. <...

How do I draw in Mathematica a graph of a network of LinkedIn users/followers/companies, etc., using LinkedIn data? I tried this: ...

Looking to combine the two approaches from these two posts here: How to Add a Constraint on the Derivative of the Model in FindFit How to fit 3 data sets to a model of 4 differential equations? ...

Consider the following Reduce statement ...

How to find the intersection point of two lines exactly, the lines are generated using some data. The x-axis is on the logarithmic scale and the y-axis is on a linear scale. ...

I have been struggling with the following issue regarding an irregularity when deploying and applying GrammarRules. Specifically, it often takes several failed attempts before the execution is ...

In versions 11.3 and 12.0, the following causes StreamPlot to fail: ...

This is a follow up of my previous question How can I define the following function for arbitray values of the arguments? that received no attention so here I will try to be more concise with the ...

When the driver drove 23km, what is the charge for the trip?

I have been using Needs["ErrorBarPlots`"] for a while but after my update to the last version of Mathematica I get the warning: ErrorBarPlots` is now obsolete. ...

clear[a]; a = List[{0, 1, 2}, {1, 2, 3}, {2, 3, 4}] a // MatrixForm; M2 = Transpose[a] // MatrixForm; a + M2 I am trying to run this code for ...

Neural Networks seem so complex these days. Can anyone please suggest a simple structure (i.e. code) for training numeric vector data: examples of 24 numeric inputs to produce 1 (integer) numeric ...

Let us have an expression for example, this: 2 (-1 + p) (3 - 4 p + 2 p^2) Boole[\[FormalX] == 1] - 9 (1 - 2 p + p^2) Boole[\[FormalX] == 2] ... For the whole ...

I'm just curious. My friend just told me that Mathematica is mostly for symbolic calculation and not efficient for Numerical computations. He told me that's the reason most of the people don't use ...

Is it possible to add a new option here and bind an evaluator? It seems that you can specify behavior by changing CellEvaluationFunction, but I don't know how to ...

I want Mathematica to evaluate $$0=\psi (x) \left(\frac{k x^2}{2}-\text{En}\right)-\frac{\hbar ^2 \psi ''(x)}{2 m}$$ and give me answer in terms of the Hermite polynomials but it gives me result in ...

I have a video of nanotubes in solution taken with a confocal laser microscope. I typically track these nanotubes with Fiesta or Fiji, but in this case, there is variation in brightness that is ...

How do I find horizontal asymptotes of f(x)=7x+2/sqrt 9x^2+4

Suppose I have defined a numerical function F[x] that for each entry x, it takes a long time to calculate. Suppose that now I ...

I've been trying to maximize and minimize the following function using Lagrange Multipliers, in Wolfram Mathematica 11.3: d = Sqrt[x^2 + y^2 + z^2 + u^2 + v^2 + w^2] Subject to the following ...

R[n_, l_, r_] := Sqrt[(n - l - 1)!]/Sqrt[(n + l)!] 2^(l + 1)/n^2 (r/n)^l Exp[-r/n]*LaguerreL[(n - l - 1), (2 l + 1), (2 r/n)] ...

In Modern Cosmology, the Geodesic Equation is described as:$$\frac {d^2x'^2}{dt}+\left[ \left( \{\frac{\partial x}{\partial x'}\}^{-1} \right)^l_i \frac{\partial^2 x^i}{\partial x'^j \partial x'^k} \...

I am working with a set of three coupled reaction-diffusion PDEs, and for some parameter values I am getting some not so great solutions. I have been searching documentation and tutorials, and I have ...

I'm trying to put a nonlinear system of two 2nd order ODEs given by: ...

I am doing a calculation which involves the numerical evaluation of the following function: $$f(x)=I_0(x)K_0(x)-I_1(x)K_1(x)$$ where $I_{\nu}(x)$ and $K_{\nu}(x)$ are the modified Bessel functions. ...

DualLinearProgramming is referenced in this tutorial tutorial/ConstrainedOptimizationLinearProgramming It exists in ...

I have a number of public notebooks with addresses like https://www.wolframcloud.com/obj/yaroslavvb/newton/lyapunov.nb https://www.wolframcloud.com/obj/yaroslavvb/newton/util.nb etc Is there a way ...

This is closely related to this question.. Suppose I have a slider control for Manipulate. Can I display the slider label in percent (or, in general, any other ...

There are really two questions. The first is: how does one get BarChart to generate x coordinates. That is, ListPlot takes a list of pairs, but ...

I'm trying to construct a 'Mathematica solution' for the following 'puzzle' The natural numbers are placed in a row; 12345678910111213... What digit is the 10,000th digit? I don't know ...

I have the following code that produces a plot: ...

I want to solve this integral ...

I want to import a csv to a dataset. This exact dataset successfully imported on a PC, but on a Mac one of the columns has garbage characters added to the key (see below example). I don't believe ...

Consider the prime counting function $$\pi(n)=R(n)-\sum_{\rho} R(n^{\rho})$$ where $R$ is Riemann's function (link) and the $\rho$ are the non-trivial zeroes of the zeta function, taken in ...