# All Questions

17 views

When I typed the command SocialMediaData["Facebook", "FriendNetwork"] I got the output ...
15 views

### How calculate the rest of the division 2/7 [migrated]

How can I calculate the rest of division about two / seven? According to this video (https://youtu.be/Nu-lW-Ifyec?t=113) the result of this division is two. But how can I know that? In calculator the ...
10 views

### How to compute the original sequence given a DTFT? [migrated]

Without directly performing an IDTFT, but by using the definition of the DTFT, how can one reverse the operation and compute the original input sequence producing a given DTFT? That is, Given ...
26 views

### LinearModelFit: Standard error or Standard error of the mean on the slope

I have generated some data points for y = 2x equation. Both x and y have SD of 1 using normal distribution. Now, I can fit the result with LinearModelFit. ...
35 views

### Can I make an array which varies with respect to 3 variables? [on hold]

Is there a way to have a function change based on different conditions? For example, let's say I have a function f[x_,y_,z_]:=f[z], where ...
28 views

### Graphics row/case number showing [on hold]

I want to draw scatter plot of two variables and showing the case number of on points of graph. and also multiple scatter graphs. Further these graphs are not disturbed on formatting their size. Dear ...
20 views

### Problem with solving an optimal control system with Shooting Method

I try to solve a system of differential equation by shooting method. I looked at questions asked on the site but I could not find that could help me. My functions are ; ...
53 views

### Is it possible to make a mathematica program which can be viewed online by anyone?

When I first learned about Mathematica online, I was very excited about it. However, it is not a free service, but a subscription similar to normal mathematica. Moreover, everything I look up about MO ...
34 views

### How do I find a polynomial in a field?

If I have a polynomial: $$f(x) = c_0 x^0 + c_1 x^1 + c_2 x^2 + \dots + c_n x^n$$ How can I find the polynomial, modulo a prime number $p$? In other words, I want to take all of the coefficients ...
22 views

### ArenaLib and WSM

The WSM documentation states that Typical tools for such purposes would include ARENA, and there exists also a Modelica implementation of that tool and modeling methodology, called the ARENALib. ...
42 views

### How to evaluate the integral of exponentials

I want to evaluate the following integral wrt $\phi$ from 0 to $2 \pi$: ...
31 views

### Replicate $\LaTeX$ PGF colormap/hot to Mathematica color scheme

I want to replicate the color scheme colormap/hot from $\LaTeX$ PGF's package pgfplots. The color scheme ...
47 views

### Plotting a two lists generated after running a for loop

So i had to model and solve a harmonic oscillator, being driven by a random driving force. I have managed to finish that and my program is: (PROGRAM STARTS HERE) ...
206 views

### How to report a bug in Mathematica

I found two bugs in Mathematica (10.3 and 10.1) and I need to report it. Is there any tools to do that or section on Wolfram website?
20 views

### Declaring functions in NDSolve ?

I have a simple enough series of coupled ODES, which is relatively easy to solve. It looks something like this. ...
31 views

### FindInstance skips solutions

I have an equation to compute the bit-error rate of a binary symmetric channel: $$P_{err}(n,p) = \sum_{k = \frac{n-1}{2} + 1}^n\binom n k p^k(1-p)^{n-k}$$ I then want to find the smallest ...
34 views

### Function for generically controlling 'Manipulate' parameters

I want to use a generic function to generate controls in manipulate, which looks like this: ...
35 views

### Mathematica Can Find the Primitive Function But It Cannot Find the Closed Form for Corresponding Definite Integral

Consider the following function f = 1/2 (-3 + 4 u) Sqrt[-u (1 + u) (-1 - u + u^2)] where it is assumed that ...
155 views

### Obtaining parametric equations through curvature and torsion

I wish to solve for the curvature and torsion functions $k_1 = \dfrac{1}{1+s^2}, k_2 = \dfrac{s}{1+s^2}$ using the Frenet Serret system and obtain the parametric equations for the curve. I need the ...
42 views

### How to use URLFetch for a https secure automated login?

( EDIT: Any example of a https secure login using certification keys using Mathematica will help. ) With Mathematica 10.3 on Windows 10 I want to use URLFetch to do a so called 'Non-interactive/Bot ...
22 views

### Getting CUDALink (Toolkit 7.5) to work on Linux, Mathematica 10.0.2, GTX750

I want to make use of some CUDA functionality on my machine. It is running Gentoo Linux (64bit), Mathematica 10.0.2 on an Intel Xeon E5-1620v3 with a Geforce GTX750. So everything on the hardware/OS ...
51 views

### Reproducing Mathematica's Nullspace basis within c++

Using the function NullSpace in Mathematica gives a basis that has very nice properties for my purposes; for example the vectors seem to be ordered with the last ...
149 views

### What governs images resizing in the FrontEnd environment

What is responsible for the middle Row images' size? And why single image row is different? ...
41 views

### Solving general system of equations [on hold]

I want to find the closed form solution to a general system of equations. The number of equations and variables is 'n'. How do I specify the system of equations? If I use Solve, I can solve a system ...
41 views

...
85 views

### How can I implement a moving standard deviation for a time series?

I imported the following dataset and converted it into a time series. ...
55 views

### What is the imperative (or pseudo) code for this mathematica code?

I know Mathematica to be a powerful tool and it is impressive how much you can pack into a one line of code. I would like to use the following line, which I don't understand completely, in an ...
40 views

### Error when training support vector machine (SVM) classifier

I am running Classify function using a support vector machine model. I get an error that I can not fix. Here is my code. The data is imported from a file *.txt: ...
81 views

### Defining a function after doing several calculations inside [on hold]

These things are probably very well known but I am a bit confused. After spending a long time, I was able to perform an operation on a function. Let's call the function ...
69 views

### Setting WholeCellGroupOpener

When I write WholeCellGroupOpener, Mathematica autocompletes it, but it doesn't recognize it (it stays blue instead of turning black). Example: ...
85 views

### NDSolve for optimal control theory

For an optimal control problem, I need to solve a differential equation in which (a) the system is formulated according to a function and (b) initial/terminal conditions are discontinuous. Here is an ...
82 views

### How to reconstruct a given schematic picture from color image

There is a nice website on popular Economics with stylish picture. ...
56 views

...
31 views

### Selection of all the objects with the same style in a notebook [duplicate]

In a notebook, I would like to select all the cells with the "Text" style to change their style. How is possible to do this with a automatic process? For the moment I can do it only cell by cell.
29 views

### Button to close cells

I want to have a button that closes cells with a specific tag. The following code does what I want: ...
79 views

### Help on using Solve

I tried to use Solve to solve a set of nonlinear equations and got this error: Solve was unable to solve the system with inexact coefficients or the system ...
80 views

### NDSolve: Indeterminate expression 0. ComplexInfinity encountered?

The following code give errors that I don't understand. Could you please suggest a method to solve these differential equations? ...
23 views

How is it possible to alert a contributor of an answer of your post that you have answered to him ? In other words, to put his name in color in comments. I didn't find back the manipulation to this. ...
7 views

### Linear vs. bilinear [migrated]

I'm tripping over something elementary: Suppose $f:\mathbb{R^2}\rightarrow X$ is linear, then $f(x+y)=f(x)+f(y)$ for all vectors $x$ and $y$. Now suppose that $f$ is also bilinear and in particular ...
777 views

### Reproduce image effect in Mathematica

How do I create the "dotifying" effect below in Mathematica? I have tried to use Rasterize first to get the image pixelated, but how do I get the disc/circle ...
62 views

### Densityplot: isolines

I'm plotting a densityplot map from interpolated data. I need to draw lines in which the value of my function is constant (isolines), but to be constant is not the function itself but a manipulation: ...
259 views

### Why does Mathematica report that $\int_1^\infty\frac{\sin(\sqrt{x})}{\sqrt{x}}dx$ = $2\cos(1)$?

Bug introduced in 7.0 or earlier and persisting through 10.3.1 or later Mathematica 10 gives the following very odd result, ...
43 views

I have exported a list of 2d coordinates as a List: Export["F:\\coordinates.dat", coordinates, "List"]; You can access the ...
64 views

### Specify range and reverse for colordata in contourplot

The following two examples work ...
58 views

### Double arrow in the outcome

Does anyone know how do I get rid of one of the double part at the start of the outcome rh-> rh-> ...
43 views

### NDSolve: problem due to boundary conditions

I am trying to solve a 2nd order ordinary linear differential equation (DE==0). Here is the code: ...
838 views

### Why is this 2D plot so slow?

I first do a 3D Plot of four surfaces (eigenvalues of a $4\times4$ matrix) over $kx,kz$ (setting $ky=0$ all along). And then I try to give a 2D plot along three connected particular lines in ...
48 views

### Issue with replacement rules screwing up a matrix [on hold]

I am pretty new to using Mathematica as more than a calculator. Essentially my problem is that I am trying to calculate a quantity vector quantity $x=x_0 - A^{-1}F(x_0)$ where $x_0$ is a 3-entry ...
I want to plot the region of a sphere that satisfies the equation $$\tan\theta\geq-\frac{z}{x\cos\phi + y\sin\phi}$$ where $x$, $y$, $z$ are my parameters. The spherical coordinates $\theta$ and ...