0
votes
0answers
2 views

Curve fitting with variable number of Gaussian curve

I have the data which appears like And I decided to use three Gaussian curves to fit it. (This code allows me to manipulate all three curves and put in best guesses for peak positions. Using these ...
0
votes
0answers
9 views

How would one go about plotting this parameterized curve using numerical resources (analitically it's too hard)?

I'm working with the system of differential equations: $$\begin{align*} \left\{ \begin{array} { l l } { (u')^2 + (v')^2 = 1 } \\ {u'v'' - u''v' = -v' + u' } \end{array} \right. \end{align*}$$ Where $...
1
vote
2answers
18 views

Subtracting off background data from my data sets

I don't know how to subtract off background data Data0 from my data sets collected in Datagen. ...
1
vote
1answer
24 views

ListLinePlot of a 3D function, over one of the arguments, with a range of values for the other 2 arguments

I have a function of 3 arguments mu[kx_, ky_, lambda_] := -(kx^2 + ky^2) - (kx^2*(kx^2 + 5*ky^2)*lambda)/(kx^2 + ky^2)^4 I want to plot ...
0
votes
0answers
17 views
1
vote
0answers
10 views

4D NIntegrate with singularities

I need to integrate a function in a 4D region (x1,y1,x2,y2), which explodes whenever x1=x2&&y1=y2. The code is as following: ...
2
votes
1answer
20 views

Import and rearrange txt file

I have a txt file like this: A B C 400 2 3 2 1 8 Now I would like to import the txt file and write it all on one line instead of in columns, so like that: <...
3
votes
1answer
31 views

How do I plot a distance map in $R^2$ to a curve given in form $y=f(x)$?

As in the title, I'd like to display image using DensityPlot representing distance to a given curve, e.g., $y=x^2$. I find it difficult to derive distance ...
1
vote
2answers
47 views

Efficient way to detect peak value changes in a list

ListPlot[list, Joined -> True, PlotRange -> Full] I would like a simple method to get the positions within the list where the values deviate a lot from ...
-1
votes
0answers
32 views

Performing a nonlinear fit from data imported from a text file

I have a text file data that I imported and I want to fit it with a given equation. I tried to fit but it did not work and gives Here is my code: ...
1
vote
1answer
33 views

Optimisation of a loop

I've opened a question here, which was answered. The code works totally fine for a small set of data. However, for a large set and over many iterations, it will take a long time (in order of 24 hours)....
1
vote
1answer
33 views

Solving eigenvalue BVP with an interface

I have a boundary-value problem, that is defined over two adjacent regions with an interface in the middle, that contains an eigenvalue $\lambda$. The boundary conditions and the equations are ...
0
votes
2answers
39 views

How can I dynamically hide and shows Graphics3D objects?

This quest is motivated by this. If I wish to visualize 3 Graphics3D objects, I can do this: ...
3
votes
1answer
43 views

Machine Epsilon is not equal to $MachineEpsilon

I try to wrap my head around machine precision calculations in Mathematica (11.2, Linux). I do not understand the following behavior: ...
1
vote
1answer
19 views

How to plot expression in x axes and variable in y axes [duplicate]

Plot[1.88 (a^(1/3)) , {a,-0.56,0.56}] I unable to plot the expression in x axes and variable in y axes
0
votes
0answers
17 views

Import data from a xls file into a Neural Net

I have 2 xls files of data. 1 for input and 1 for output for neural net. They are of the form {{1,2,3,4,5,6,7},{7,2,3,8,5,9},....} I can get the files into Mathematica, but unable to get it to train. ...
0
votes
0answers
58 views

Solve equation of motion with Dirac-fermions?

I want solve a System with n equation of Motion in first order. In this equation of motion are creation and annihilation operators of Dirac-fermions. I cannot figure out how to describe the creation ...
3
votes
2answers
36 views

Visualizing Color Values On Original Image

I have an image and I would like to retrieve all color values of pixels which are located along stribes: So what I do, is the following: I import the image from the web I get the image dimensions (w,...
7
votes
1answer
102 views

Exporting graph object for later use

We are planning to analyze geometry of artery branch pattern. We convert the binarized image into graph object using MorphologicalGraph[]. To avoid the complexity ...
5
votes
2answers
134 views

Problem with Graphics`PolygonUtils`PolygonCombine

Writing: Normal@ParametricPlot[{x, x^2 t}, {x, 0, 2}, {t, 0, 1}] /. p : {__Polygon} :> Graphics`PolygonUtils`PolygonCombine[p] I get: but if I write: ...
0
votes
0answers
44 views

Solution of Laplace equation

Is it possible to solve $\qquad Uxx + Uyy=0$ and $\qquad U[0, y]=0, U[1,y]=0,U[x,0]=0,U[x<0.3,1]=10,U[x>0.7,1]=10$ and Neumann condition in (0.3, 0.7)?
0
votes
1answer
40 views

Plotting a family of functions with For

I'm trying to plot a family of functions differing only by a constant $c$. The function is: $2x^2-5x+c$. In order to plot them I'm using the following code: ...
2
votes
2answers
44 views

Using a table within a RegionPlot3D to plot multiple cubes

Here's some code that will produce a cube: ...
0
votes
0answers
14 views

Setting reduced Range for 3dprint

Unable to set Range for 3dprint as part of full 3D parametricPlot3DRange. RevolutionPlot3D[{50 + 25*Cos[u], 25*Sin[u]}, {u, 0, Pi}, PlotStyle -> Thickness[3], PlotRange ->{ {0, 80} {-80, 80}...
2
votes
1answer
82 views

How can I obtain the domain of a resulting Interpolating Function?

I have a problem with obtaining the domain of resulting Interpolating Function in my calculations. I want to solve the following differential equation ...
1
vote
1answer
45 views

Inserting dat by using for? [duplicate]

I have data set in a form ROG1.dat, ROG2.dat,...,ROG100.dat, I want to import all of them in Mathematica, Can you tell me how? Best
0
votes
1answer
36 views

How to correct not precise values

I have the source file file = "test.txt" with these values: ...
0
votes
0answers
26 views

AceGen list parameter

I am working with AceGen and I try to define my own materiał and in this material I have a parameter K which is calculated at every incement. My problem is that ...
1
vote
0answers
40 views

What use is empty binding list in `Block[{},…]`? [duplicate]

Spelunking the Export function, I stumbled upon the following definition: ...
0
votes
1answer
33 views

Contour Plot with logarithmic scale [duplicate]

I am trying to plot an equation using contour plot with x-axis in logarithmic scale. ...
1
vote
2answers
27 views

Change distance between vertical y-axis label and plot

I'm trying to do something that should be fairly straightforward: having a vertical y-axis label. My problem is, it creates a ridiculously large space between the label and the axis (exactly what I'm ...
1
vote
1answer
17 views

Node label's letter case in graph incorrectly displayed [on hold]

Upon constructing the following graph, I expected the node labels to appear as per what is provided. The letter case of Node E is not in CAPS as shown below. Please correct me if I misunderstood ...
3
votes
1answer
35 views

How to render a segmented volume?

Here is a segmented volume with 96 different features. I wish to visualize each feature with a distinct color. I followed this documentation and used Blend to ...
1
vote
1answer
35 views

Iterative loop for a given list

Suppose I have the following list: ...
5
votes
2answers
150 views

Undesirable grid appears when ParametricPlot is exported as PDF

Writing: plot = ParametricPlot[{x, Min[1, 2] t}, {x, 0, 2}, {t, 0, 1}, PlotRange -> {{0, 2}, {-1, 2}}] I get: but if I write: ...
1
vote
1answer
60 views

Toroidal metric in a random geometric graph

I have some code I've been using to generate some random geometric graphs as fast as possible. The boundary conditions on the rectangular domain I am using sometimes interferes with a clean ...
1
vote
1answer
27 views

Exporting Table format and strings not enclosed in quotes

The help file for format/Table says very clearly "By default, Export delimits text fields containing the field separator with double-quote characters." A simple ...
0
votes
0answers
65 views

Efficient way to make updates in a big List

I would like to know is there is a way to do this: ...
1
vote
0answers
51 views

Analytical solve for biharmonic equation

I want to analytical Solve or numerical solve by Mathematica a biharmonic equation with homogeneous boundary conditions homogeneous? I considered its solution using Fourier analysis, which is not ...
2
votes
1answer
65 views

unmatched output for density plot

I am plotting Abs[R] on y-axis vs k on x-axis with the following code ...
4
votes
1answer
146 views

Opening Mathematica file in google drive

I have a Mathematica file in my google drive. There is no option to open the Mathematica file directly, without downloading it. Is it possible to directly open the file from google drive?
0
votes
1answer
61 views

Generate random point on the external surface of this complex geometry

This is a followup to this question of mine. How do I generate a random point on the most external surface of this complex geometry? ...
2
votes
1answer
33 views

Is there a way to produce an “evaluate at” vertical bar that resizes properly in display formulae?

There are two examples of what I am talking about in this equation: $$\displaystyle \left.\mathrm{d}\Phi\left(v\right)\right|_{p}\equiv\left.v^{\mu}\frac{\partial\Phi^{\lambda}}{\partial x^{\mu}}\frac{...
0
votes
0answers
42 views

NIntegrate giving different values for different integrating methods [on hold]

My problem stems from trying to integrate fsbb which will be shown later. Here's how fsbb is defined. I first have a 3x3 ...
0
votes
0answers
32 views

Editing the function argument

I'd like to construct a function, that changes its own input. The code ...
2
votes
2answers
40 views

Correct way to see domain of function using DownValues?

Here's a simple function g defined for the natural numbers 1 through 10: Table[g[i] = i^2, {i, 1, 10}] I now want to find the ...
1
vote
0answers
28 views

List of Financial Index in Mathematica

I have to work with different Financial Futures Index in Mathematica using the function "InteractiveTradingChart". But, I can't able to find a complete list of all the available Financial Futures ...
0
votes
0answers
55 views

Numerically evaluating functions with subscript or indices [on hold]

I am numerically solving a large set of coupled ODEs. The tutorial here: http://reference.wolfram.com/language/tutorial/NDSolveIntroductoryTutorial.html ...is ...
0
votes
1answer
29 views

Work with real time interactive trading chart whith different time frame

I would to work with real time interactive trading chart, for example: which is the daily chart of Dow Jones Inustrial Index But, the problem is that Mathematica "InteractiveTradingChart" function ...

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