All Questions

I have a question regarding Block. In Doc, Block[{x=x0,…},expr] suppose we have two functions in ...

I am struggling with the task to merge four matrices as presented below. Since the matrices A-D contain more than just four entries it would be too complex to do it by hand. Is there a simple or ...

I am trying to create a graphics that outputs the population of a city on the graphics that is clicked. The problem is that it is not updating the last point that is clicked. Please help. ...

I used DiscretePlot3D to plot my equation, but when I tried to combine two different plots into one, Show did not work. Do you ...

I'm experimenting with the Through function. I suspect there is a way to use that function to obtain both the mean and difference of two values. But this doesn't ...

There is a list: {1, {a, b, c}, 1, {1, 2, 3, 4, 5, 6, 7, 8}, {A, B, D, Z}} It contains sublists of different elements and several $1$s. The goal is to replace ...

I have two lists: list1 = {{{x1,x2},{x3,x4}}, {{x5,x6},{x7,x8}}}; list2 = {{{x9,x10},{x11,x12}}, {{x13,x14},{x15,x16}}} I need to join them to get one list: <...

My wife and I have tried to calculate Log[8 E^(3 Log[0.5]) on a TI-Nspire and we got the result -8E-14. We have changed th settings of calculation to Exact and the result was 0 (correct) If I use ...

Hi I have a simple question. Given a random string in the format accepted by the Import[fileWithString, "Data"] i.e the file contents being ...

I am trying to run code on a Lightweight Grid using ParallelDo. I have ~300 jobs that each take ~20 minutes to run and produce ~8 MB of data, and I am using a ...

Can anybody explaining this code? ...

How can one combine multiple DensityPlot3D plots so they are all equally visible in the final plot? Here is an example: ...

I am trying to find the resonant frequency of a particle by Fourier analysis of the trajectory. Here is the data file. ...

I am trying to reproduce figure 10 in the linked paper. The authors have used Matlab bvp4c function to find multiple solutions for the system of ODE and then carried out the stability. Here is my ...

I have a 3x3 matrix. By setting the determinant to 0, I find the values of w in terms of ka and graphed the complex solutions. m, M, k, l are constants: ...

I tried using linear model fit according to the example found here https://reference.wolfram.com/language/ref/ConfidenceLevel.html I noticed that ...

I'm experimenting with units: UnitConvert[1/Quantity[2.0, "GHz"]] 5.*10^-10s ...

My objective is to read the results of several tagged cells in a notebook NB1 from another notebook NB2. Following the ...

I am trying to calculate a integral over a region defined by But I dont really know how to do it, I dont know if I have to work in cartesian coordinates or polar coordinates. The function that I ...

I have an issue with Mathematica. I have some code and its answer. When I run the code on my system, it doesn't work. The person who wrote the code believes that is correct, and I agree. I tried to ...

Does Wolfram have the ability to (attempt to) convert an image of a arbitrary plot on the web, say: to its corresponding Wolfram representation (in this case:...

Suppose that I have a data set data (input): ...

Given two tolerances (like 10^-3 and 10^8), how can I compare accuracy of the two methods (explict Runge-Kutta and Adams) for the following system ` ...

I'm using Manipulate together with CreateDialog to run a ListPlot whenever I click on a ...

I have the discrete integration filters: $$y(n) = Ax(n) + By(n−p) , \text{$A$, $B$ real constants, $p$ positive integer}$$ EDIT: in the initial version of this question I focussed only on the case $...

Let there be the following working example ...

Update: the following code proposed by Lukas works perfectly. I have tested both fraction or $a/b$ form, both work. I have revised the code a little bit, to make it more flexible: ...

The following code draws the following circles; ...

Could anyone please help me with smoothing my data. The list plot of the data looks like this: My goal is to create a list plot without those oscillations. Preferrably with the final curve being the ...

There have been lots of questions around regarding the issue that NMaximize/NMinimize may give results - or at least evaluate ...

So I have this code right here. ...

Can anyone suggest a fast and efficient global stiffness matrix assembly code in FEM?

I am very new to Mathematica, so I might be doing something dumb here. I'm trying to make a graph of the following code and it keeps on giving me an error ...

Bug fixed in 8.0.4 for Chinese edition only, generally fixed in or before 11.3. I'm using version 7 on Windows. After I running one .nb file and just want to ...

Is there a way to change my bar chart's Y-axis from powers of 10 to "billions of dollars"? For example $100,000,000,000 should read as ...

Is this a know issue? The following MWE works and gives plot immediately ...

Let's say we have the following time-series. ...

I have a very long code in a notebook nb1 in which all the initialization cells are tagged. I have another notebook nb2 where I ...

I'm very new to Mathematica. I searched through the online documentation, but I don't understand why it realizes that $\sin(n\pi)$ for $n\in \mathbb{Z}$ is $0$: ...

How can I remove the white line in $y=0$? This is my code: ...

I have two equations in 3 variables a2, b1, b2: ...

https://imgur.com/a/SnTYESG (subtraction between the image) https://imgur.com/a/ZdOS5wf (orignal image) From the original image, since my CCD camera is bad, I cannot really see anything. However, ...

I have been trying to create a continuing fraction to help prove the theory about any rational number: a/b being able to be written as a continued fraction where the remainders found in the Euclidean ...

I am trying to compile something similar to the following: test = Compile[{{data, _Real, 1}}, First@FirstPosition[data, _?(# > 0 &)]] However I get the ...

I want to take the derivative of this with respect to eta: fabc = 1/2 (-3 + 27/(2 + x)^2 + (1 - 1/(1 + (-1 + x) c[eta/cc])^2)/ c[eta/cc] + 2 Log[x]) Here I ...

I have used below code to plot the solution of an integral, but the code doesn't return anything. Could somebody please help me in this regard? ...

This code produces straight lines, I'd like to find which n values are on which of the lines: ...

Im interested in counting the number of operations required to evaluate a given formula. Let me give you an example. Lets say I have entered the expression $\dfrac{\operatorname{Sqrt}[\operatorname{...

How can I estimate the hidden Markov model while using the same value for some of parameters? First, let's get test data (sorry, messy!) ...

In this sum over $k$ Sum[Sin[k (k - 1)]/k, {k, 1, ∞}] the result still containes the summation index $k$. ...