All Questions

Let's say I have the a number $p$ and that is a number that exists of $k$ digits, how can I find a specific digit in that number? For example, I want to find the 10th digit in the number $...

Why is the error coming and what should I do to resolve it

Message: 196512625 25825210 250970710 140420423 22130212 288711674 26343056 Plaintext is grouped in blocks of 4 letters. What I have so far =( ...

I am trying to find the barycenter of some spectra using numerical integration. I tried to find the wavelength for which the integral splits the spectrum in two equal areas, but the result seems wrong....

I need help with the math problem: in a unit area, I have N(A) tiny dots, the area of each dot is S(A). What is the general formula that gives the maximize distance between these dots? To help explain ...

Simple question but couldn't find answer anywhere.. I'm trying to write a coordinate of a point as such: "(" Subscript[x, k] "," Subscript[y, k] ")" But the output is ...

Given a list of functions what is the best way to find the domains on which each function is the smallest. Simple example ...

Here is an example equation: Solve[{a*x + b*y == c}, {a}] It gives me: a -> (c - b*y)/x To solve the same equation for <...

I have a basic graph such as the following; ...

I need to compute quite a few multidimensional integrals with Bessel functions. Here is one example ...

First, when I calculate $\Pr \left[ {X > \frac{2}{Y},X > \frac{4}{Y}} \right] = \Pr \left[ {X > \frac{2}{Y}} \right]\Pr \left[ {X > \frac{4}{Y}} \right]$ with $X,Y$ follow the exponential ...

There seem to be a lot of questions regarding the formatting of bar charts. Sadly, I couldn't find solutions to my problems, despite all the skimming. Apologies if I missed something. Problem ...

I'm solving a complex system of equations step by step. And for each of them, I get one of the four solutions q0, q1, q2 and q3, one at a time. Each time with a nice substitution list like : ...

I have a number of val = 0.000015783 which represents a current value in Amps. I want to display it with 3 significant digits and with SI prefixes instead of the ...

I have a list containing 100 complex numbers lying between 1.9 + 1.9 i and 2.0 + 2.0 i you can download its mx file from the link below and import it in Mathematica: http://adambarfib.ir1.rapidpars....

.If a ≥ 0 and b ≥ 0, prove that (1/2)(a + b)≥√ab can i use (a+b)^2=a^2 + b^2 +2ab to get (a+b)^2-(a^2 + b^2)=2ab therefore (a+b)^2 ≥ 4ab then, 1\2(a+b) ≥√ab

After getting my account I successfully installed the Windows version on Windows 10 and the linux version on Kubuntu 20.04 on a multiboot laptop. However when I tried to install the linux version on ...

For the image below, would like to make the heavy black downward sloping lines more prominent and the fine gridlines in the background less prominent. Also, would like to provide operations for the ...

I have a question regarding how to use ListDenistyPlot. I am trying to plot a large list of data (150,000 data points) by using ...

I am trying to do a recursive numerical method to solve an ODE in Mathematica. Whatever I try, I cannot get the computation time down. I need to do over 1000 steps, but I cannot get even 20 steps ...

I am trying to learn how to integrate functions using composite newton-cotes. In other words, I want to divide the interval we are integrating over into $n$ equal subintervals, and then apply Newton-...

I'm trying to run a simulation. I will number sentences to make response easier. (1) Here is my first equation: ...

How can I plot 2 <= z <= 5 in a 3D graph? Also, how can I plot only two variables in a 3D graph. For example x = 2, y = 3. I've been using CountourPlot3D and other help but cannot resolve it.

If I have the following data: https://pastebin.com/2jgDw4iQ which plotted using the following code ...

I work on problem that need to define function with two list of data as follow ...

Suppose a list of students'grades in excel: "excel files" I want to write a program separate student grades to their respective classes and then write them in one excel file. What should I ...

I found the following example online (which works fine) for sending commands from Java: ...

I have the following code: ...

How to use Mathematica to solves any linear diophantine equation of the form ax+by=c, whenever it is solvable. Such as this example, How to get the x = -165, y = 238. Thanks! Link: https://mathworld....

I have a problem statement that seems to be a reduced version of the knapsack problem, but I don't know how do it in Mathematica. The problem is as follows: Given a set, S, of integers (e.g {a,b,c,...}...

I am trying to initialize a 48600 x 48600 packed array from a sparse matrix and a diagonal matrix in Mathematica 8. If S1 is a sparsearray of that size then and S2 is list of 48600 length, then I am ...

I am trying to numerically integrate a function using nested NIntegrate: $$F(N,x,s)=\int_{-\infty}^s \int_{-\infty}^{+\infty} K(N,z',x,x') g_{x',s'} dx'ds' $$ where the kernel of the integration, $K(N,...

I just want to get a list plot for my model which I wrote with help of the module. ...

I have attempted to exercise a non-linear model fit to my data, dadtAbs, and got the following puzzle ...

I am trying to access UnityLink on Mathematica version 10. When I follow the only found directions, I receive an error that does not inform me on how to resolve the issue. I quote from the notebook: ...

I want to solve for X in the equation ode1 (Meaning to leave it alone, or that all the values are on the other side of the equal sign) but the answer it gives me includes to then graph it X vs L but ...

I'm trying to replicate a plot that has both (x,y) normalized variables, I've tried using Evaluate and Contourplot with no success. I have set Rn=20, but it should be another variable. Where Fn=fs/fr, ...

I have the vector: $$sin2\theta(cos\phi +\frac 1 2sin\phi)\vec r +2cos2\theta(cos\phi+\frac 1 2sin\phi)\vec \theta +2cos\phi(\frac 1 2cos\phi -sin\phi)\vec \phi$$ in spherical polar coordinates which ...

I am using Mathematica to develop some ``interesting" problems for students to solve using Fourier series. The following computation seems as though it should yield a real result: $B_n = \int_0^1 ...

I have a question regarding the use of the For[] loop to generate a list of outputs from a function that generates random outputs. Essentially, creating a sample of ...

Context I would like to show that these 2 functions are identical ...

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: ...

I've simulated a monthly regular cash flow with Excel, and the Internal Rate of Return (IRR) calculated from the first date to the current row. The curve of the IRR is very similar to the Transfer ...

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I have this term Sqrt[(B Bc)/(A^2-B Bc)]Sqrt[B Bc+A(-A+Sqrt[A^2-B Bc])]Sqrt[-B Bc+A(A + Sqrt[A^2-B Bc])], which actually can be simplified to B*Bc. However, it ...

$$\alpha \int_{0}^T \text{Sin}(fi−fk+Δf)∗t) \, dt $$ I am integrating this in Mathematica, My code is (1/2)*α*Integrate[Sin[2*Pi*(fi - fk + δf)*t], {t, 0, T}] + Ν1 ...

Today, while using mathematica, I entered the command Sum[1/Factorial[n], {n, 0, x}] and found that: $$\sum_{x\geq n\geq0}\frac{1}{n!}=\frac{e\Gamma(x+1,1)}{\Gamma(...

I plotted the function given in the figure with respect to "z" .I obtained different plots for different distinct values of "t". Now please can you help how to obtain the ...

How can I solve the Schrödinger equation for hydrogen in spherical coordinates in 3 dimensions with Mathematica using DSolve?

I tend to code in small chunks before putting it all together into a larger sum that does a lot more. In doing so I often need to erase or delete as much as possible from memory and cache (including ...