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Questions tagged [plotting]

For questions about plotting data related to a computational problem. Be sure to include the program/language you are using to create the plot.

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A plane or surface passing through two surfaces in MATLAB

I have just been able to plot several surfaces using the code below. What I want is a plane or a surface that connects the black and yellow region in the output of the code below: ...
vidyarthi's user avatar
  • 111
0 votes
0 answers
24 views

Computing autocorrelation of scalar values

I obtained a list of $r^2_{end-to-end}$ from a Monte Carlo simulation of polymer movement. ...
user366312's user avatar
0 votes
0 answers
115 views

Which data can I use to draw the figure?

Please refer to the PhD thesis given at the following link: Etienne Bernard. Algorithms and applications of the Monte Carlo method : Two-dimensional melting and perfect sampling. I want to draw the ...
user366312's user avatar
3 votes
1 answer
405 views

How can I draw a regression line in log scale?

The supplied code draws some data points and the corresponding regression line. The regression line goes through or is near most of the data points on a linear scale. . However, on a log scale, the ...
user366312's user avatar
0 votes
1 answer
54 views

How to plot the nodes from 0-2 and from 9 to 28, without including nodes from 2:9 [closed]

I want to plot nodes from 0 to 28 without including nodes from 2:9 I tried to use this command, but got syntax error: ...
KekLol's user avatar
  • 3
0 votes
0 answers
34 views

Doubt of wavelets about the return of comand plot() of package Wavethresh in R language

I take a plot of father wavelet with this code library(wavethresh) y <- c(1,1,7,9,2,8,8,6) ywd <- wd(y, filter.number=1, family='DaubExPhase') plot(ywd) But ...
Siqueira's user avatar
1 vote
0 answers
30 views

SageMath: How do I plot the sum of a deterministic variable and a random variable

Suppose I have the following function $$f(x,y,z1,z2)=g(x-z1,y-z2)$$ where $g(x,y)$ is a deterministic function from the $X\times Y\to S$ and $z1,z2$ are random variables following a known probability ...
vidyarthi's user avatar
  • 111
0 votes
0 answers
33 views

How can you plot a value in PYTEARCAT?

I've been working with Tensor calculus using the Python module PYTEARCAT. (See: https://arxiv.org/abs/2106.15016 and https://github.com/pytearcat/pytearcat.) It calculates quantities such as the Ricci ...
Sciencemaster's user avatar
0 votes
1 answer
52 views

Why is the maximum potential energy greater than the maximum kinetic energy?

I was plotting the energy variation in a mass-spring system. If I define the initial conditions to be at maximum displacement from the origin, the potential energy is plotted correctly but kinetic ...
Belal Bahaa's user avatar
0 votes
0 answers
43 views

How to compare the bias between the two contour plots?

I wish to compare the value of the normalized concentration (c+), between two contour plots (one is experimental and another is a simulation). If I don't have a c+ value from the same point on both ...
Auberron's user avatar
  • 101
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0 answers
73 views

Getting gradient from voxel, is it possible and how?

The R package rmarchingcubes implements a marching cubes algorithm. Given a voxel contructed from a function defining an isosurface, it returns a 3d mesh with some vertex normals. When I plot this ...
Stéphane Laurent's user avatar
0 votes
1 answer
129 views

How to remove singularit​ies/discon​tinuities on 3D plots in Matlab?

I want to plot some functions f(x,y) including singularities. For example; f(x,y)=tan(x-y) In Matlab, when I run the following code ...
1_student's user avatar
  • 101
0 votes
1 answer
537 views

How to draw a vertical line in Paraview Line Chart

I would like to insert a series of vertical lines to divide up a line chart. The figure below shows the chart so far, but instead of the orange diamonds I want vertical lines that go from top to ...
BenG's user avatar
  • 103
-1 votes
1 answer
162 views

plotting $F=K \frac{q_1 q_2}{r^3}$ in python

I tryin to plot the position of electron in the hidrogen atom by Coulomb's law, $F=K \frac{q_1 q_2}{r^3}$ This is mi code ...
Rei D Gar's user avatar
0 votes
1 answer
160 views

Plotting two data sets in Octave

I have two data vectors $y1$ and $y2$, and I want to plot both of them as functions of the vector $x$. I want the result to be two overlapping curves. Here is the set of commands I am using. y2=[0.003,...
In the blind's user avatar
0 votes
0 answers
72 views

FEM solution becoming wider as number of nodes increase

My FEM scheme uses a 4-node quadrilateral element with bilinear shape functions. The simple problem I'm solving is. $\nabla ^2 f = 5$ But as I increase the number of nodes, the plot of the solution ...
VaeKnt's user avatar
  • 1
0 votes
1 answer
2k views

How to use cumtrapz correctly?

I have tried to do a trapeze integration with f(x)=x^2, where I know how the antiderivative looks like, so F(x) = (1/3)x^3 Here's my code, just like I tried: ...
mathflower's user avatar
1 vote
1 answer
1k views

Bode diagram without bode() function

Is there any way to make a bode plot without using the MATLAB/GNU Octave function bode()? As an example, here is a function I am working on: $$H(s) = \frac{1}{2s^...
user avatar
-1 votes
1 answer
183 views

Plotting the difference between an exponential and its Taylor expansion as a function of number of terms?

I'm terribly green, please forgive me. I need to plot the difference between a chosen calculated Taylor expansion $e^x=1+x+\frac {x^2}{2!}+\frac {x^3}{3!}+\frac {x^4}{4!}+\frac {x^5}{5!}$... and the ...
Vector Vacuum's user avatar
1 vote
1 answer
60 views

Using Axis Equal for Matlab simulation plots of the SIR model gives very flat solution curves

My professor taught us to always use the Matlab command axis equal for our simulation data plots - for all of our homework assignments. However, in studying the ...
user35665's user avatar
2 votes
1 answer
458 views

How to plot a heatmap under a curve?

If I were to have a data for a one-dimensional system evolving in time, essentially a two-dimensional array, and the array at each point in time is of the same size, how would I produce something like ...
strider's user avatar
  • 23
-1 votes
1 answer
624 views

Plot of a function involving an integral and value changing parameters [closed]

I'm trying to plot the cross section with respect to the photon energy $h\nu$ but for $\gamma = 1.0, 1.2, 2.0 $ in the same axes $\sigma = \left[\left(\frac{\xi_{eff}}{\xi_{0}}\right)^2 \frac{n_r}{\...
Daniel Lima's user avatar
0 votes
2 answers
569 views

contour plot of cloud of points [closed]

I have a cloud of points scattered in a rectangle and some data in this points, a bit like this $$ x(:)=[x(1), x(2), ..., x(N)] \\ y(:)=[y(1), y(2), ..., y(N)] \\ u(:)=[u(1), u(2), ..., u(N)] $$ ...
Amine HANINI's user avatar
3 votes
2 answers
483 views

Estimation of viscosity from critical properties

The above graph represents reduced viscosity as a function of reduced temperature for several values of the ...
kedarb's user avatar
  • 33
1 vote
0 answers
212 views

How to set the errorbars in a different color from the plot in Matlab? [closed]

When making a plot in Matlab using errorbar(...) the color of the error bars is the same as the plot. How do I set them to be in a different color? I tried looking ...
TensoR's user avatar
  • 163
3 votes
2 answers
2k views

Graphing electric potential of a ring of charge using MATLAB help

Here is a summary of what I am trying to do: Use MATLAB to compute the potential $V$ at any point $(x, y, z)$ in space due to a uniform ring of charge. Use a Riemann sum to compute the integral ...
Andrew's user avatar
  • 163
0 votes
1 answer
140 views

Monte Carlo - Random Walk Simulation - polyfit the log log data points?

This is part of the code in matlab for a random-walk simulation. To test the code, I'm using steps=[30]; there will be more values, but I want to run it for 1 trial to decrease code processing. <...
ThermoRestart's user avatar
1 vote
1 answer
2k views

Gnuplot: How can I determine the maxima of a fit function in gnuplot?

I have a set of data data.txt which can be fit to a Gaussian function, f(x). I want to determine the coordinates of the point of ...
ntk47's user avatar
  • 91
1 vote
1 answer
4k views

Efficiently plot a finite element mesh solution with Matplotlib

I am looking for the most efficient way to plot a mesh using Matplotlib given the following information, coordinates of each node, what nodes belong to each element, and the value each node has. Below ...
AzJ's user avatar
  • 165
1 vote
1 answer
214 views

SciPy 3d plotting Integral of $\int x^y dx$ for $y$ in $[-4,4]$

Ideally, I would like to get the symbolic/algebraic integral of the function and plot the resulting surface in 3d. I am not sufficiently versed in SciPy to know if this is even really possible.
user20460's user avatar
0 votes
2 answers
189 views

Plot a multi-variable equation in (discontinuous) regions

The goal is to display the relation between K and E in the following equation: $$\cos(K) = 5 \text{sinc}( 5.12\sqrt{E} ) - \cos(5.12\sqrt{E} )$$ The intended result is: However, using the following ...
Ziezi's user avatar
  • 125
0 votes
1 answer
100 views

How to report non-monotonic runtimes in convergence plots

Let's say I have an algorithm that can be tuned by a parameter $h>0$ and is expected to converge as $h\to 0$. I want to study the computational complexity of this algorithm, i.e., how the ...
Bananach's user avatar
  • 799
1 vote
0 answers
2k views

Software for easy spherical coordinate plotting from data file

Does anyone have any suggestions for good open source plotting software which has good graphical spherical coordinate plotting (from a data file). I have a three column data file where column 1 is $\...
Moses's user avatar
  • 111
0 votes
1 answer
66 views

Plotting using 'colorbar' in MATLAB [closed]

I am trying to plot a figure similar to the one attached here,I tried searching how to do a similar kinds of plot and i found about 'colormap','colorbar' in MATLAB. Actually I want to plot this ...
BAYMAX's user avatar
  • 229
1 vote
1 answer
2k views

Strong scalability plot, HPC

I have to create a strong scalability plot, which measures the execution time for a numberOfThreads =1,2,4,8,16 with size=1024. ...
N.Der's user avatar
  • 13
1 vote
1 answer
769 views

Plotting the same function multiple times on the same set of axes but with different parameters [Python]

I am currently trying to plot a function which describes linear perturbation growth in cosmology for different world models. I would like to be able to have all the curves on the same set of axes, but ...
Daniel's user avatar
  • 33
1 vote
1 answer
485 views

Plotting Excel data with Julia [closed]

Let me first be clear that I'm still new to Julia. I need to plot time series data contained in an Excel file using Julia. So far I couldn't find any packages for that. The only workaround I found ...
Slakeon's user avatar
  • 13
2 votes
1 answer
518 views

Contour plot of a scalar function over the complex domain in MATLAB

I'm trying to make a 2D contour plot of a function with a complex input and a real output, namely: $f(z=x+iy)= |z^2-3z|$, on MATLAB. I want to make a contour plot of f, such that the axes are $(x,y)$, ...
Kyle Macdonald's user avatar
1 vote
1 answer
831 views

2d slice cut of tetrahedral mesh in tecplot 360 ex [closed]

I have made a 2d slice cut of a 3 dimension figure. When I select "mesh" to display the mesh on the slice, tecplot seems to connect the vertices in a strange way (it seems like two 2d meshes are ...
Jack's user avatar
  • 55
1 vote
1 answer
726 views

3-dimensional plotting with nonuniform grids

I have 3 variables I am considering: time (t), 1-dimensional space (x), and intensity (I). I would like to plot the intensity in the z-axis as a function of t and x (the latter two variables would ...
Mathews24's user avatar
  • 568
1 vote
2 answers
541 views

Generating 4D Plots in Matlab

I have some data in the form of: ...
Maziar Noei's user avatar
0 votes
1 answer
297 views

Nice plot of f(x)

A user has this nice graph of f(x) on his profile and I want to learn how to do it in matlab or Gnu octave. ...
Niklas Rosencrantz's user avatar
0 votes
1 answer
328 views

How to plot selection over time for only components, but not magnitute. of a vector in paraview?

I am doing a time evolution analysis for a structure and have already got the displacement result, which is a vector including x and y components. And I want to plot the time evolution of x and y ...
user123's user avatar
  • 679
5 votes
1 answer
1k views

What determines the usual chemistry textbook plots of atom orbitals?

In elementary chemistry textbooks you often have pictures like the following one: Are there any conventions how to get them? I am not sure, but I guess that it are contour plots with only one iso-...
student's user avatar
  • 231
1 vote
1 answer
597 views

How to make scatter plots of scalar fields with free software?

How can I make a scatter plot like the following, where the density of points represents the magnitude of the scalar field at that point. Consider for example the probability density for an atom: I ...
student's user avatar
  • 231
0 votes
3 answers
2k views

How to plot a price level matrix in Matlab?

I have a matrix P of m rows and n columns. P(i,j) contains the price of occupying position i at time j. I want to plot this in Matlab but in a way to get some kind of density plot with different price ...
abdeaitali's user avatar
0 votes
2 answers
4k views

Having smoother contour plots in MATLAB

I have a $80\times200$ matrix, and I want to plot its contents with the contourf command in MATLAB, as follows: \begin{align} &\text{[C,h] = contourf(mat,100);}\\ &\text{set(h,'LineColor','...
Maziar Noei's user avatar
0 votes
3 answers
100 views

Software recommendation for plotting data from lab tests

I have several files of data created by LabView of hydraulic pressure testing over the course of a few days. This data is mostly time with various pressure and temperature measurements. Can you ...
LSUEngineer's user avatar
1 vote
1 answer
277 views

How to change level of contours in animation for Tecplot360

I am working on a transient heat transfer problem. The problem that I have is as the time goes the range of temperature is changing but Tecplot only use one sort of levels for contour for all of time ...
mojijoon's user avatar
0 votes
1 answer
106 views

Visualise data under Tecplot

I have a set of data that I need to visualise under Tecplot, the file format is for example: ...
Don's user avatar
  • 3