Questions tagged [plotting]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
18
votes
3answers
2k views

Log-log parallel scaling/efficiency plots

A lot of my own work revolves around making algorithms scale better, and one of the preferred ways of showing parallel scaling and/or parallel efficiency is to plot the performance of an algorithm/...
11
votes
2answers
8k views

How do I plot the surface of a 4D plot?

I am trying to plot the wave function for a particle in a 3D box. This requires me to plot 4 variables: x, y, z axes and the probability density function. The probability density function is: ...
6
votes
2answers
865 views

Python package for (adaptive) function plotting

Are there any mature Python packages that can plot functions, and possibly use adaptive sampling? I am looking to pass only a function (can be a numerical black box) and a range, and expect a plot as ...
6
votes
2answers
3k views

How can one produce a proper streamline plot?

I recently had trouble producing a proper streamline plot in Mathematica, and apparently the problem is a good bit harder than I appreciated. I would like to know if there exist general algorithms to ...
4
votes
2answers
8k views

Visualising Maxwell's equations using MATLAB

I asked this question to help me understand what is going on in one of Maxwell's equations. I am happy with following through the maths on paper now, but would like to use MATLAB to take it one step ...
4
votes
1answer
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-...
3
votes
2answers
596 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 ...
3
votes
1answer
73 views

Estimation of viscosity from critical properties

The above graph represents reduced viscosity as a function of reduced temperature for several values of the ...
3
votes
3answers
6k views

Obtaining a 2D profile from a 3D surface

I am plotting a saturation field (as the solution of a finite element problem, using trisurf in MATLAB). Ideally, I would like to obtain the two-dimensional profile ...
2
votes
2answers
576 views

Should a colorbar have constant values throughout a simulation?

The default option for matplotlib's pcolormesh (also true for VisIt and I think also true for Matlab) is to allow the maximum and minimum of a colorbar vary. Which ...
2
votes
2answers
231 views

single-variate function variational Intensity Plot for Matlab

I'm wondering if it's possible to create functional intensity plots in matlab. Examples of what I'm looking for are below found in this paper: These figures were (guessing) probably made in R, but is ...
2
votes
1answer
5k views

Plot a surface from data sets in MATLAB

I tried to plot a surface in MATLAB but, since it is the first time I had to do something like this, I need a confirmation on the process I followed because it is important for my project to plot the ...
2
votes
1answer
58 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 ...
2
votes
1answer
301 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 $(x,y)$, ...
2
votes
2answers
86 views

Adaptive plotting of two-variable functions $z=f(x,y)$ algorithm pseudocode?

I am looking for explanations of algorithms to adaptively sample a function of two variables $f(x,y)$, in a given domain $x_0\le x \le x_1$, $y_0\le y \le y_1$. Intuitively, I want to sample more ...
2
votes
1answer
187 views

How to plot feasible design space of a Generic Multiobjective Optimization problem?

As you know, a generic Multiobjective optimization problem can be stated as follows: $min{\space}F(\bf{X})=[f_1(x),...,f_n(x)]$ $h_k(x)=0{\space\space\space} k=1,...,n_e$ $g_i(x)\leq0{\space\space\...
2
votes
1answer
1k views

tecplot 360: convert face-centered data to node data

Is there a way in Tecplot to change data from face-centred to node-based? If I look at the plot, it seems to me that internally Tecplot is changing the data from being at the centre of the face to ...
2
votes
1answer
2k views

2D cross section from 3D surface

I am trying to apply the "restoring force surface" method to a dynamic linear system. The idea behind this method is that, knowing acceleration, displacement, velocity and input force it is possible ...
1
vote
4answers
12k views

What's the simplest way to graph a 2d array generated in C++ using Windows 7?

This was so much easier in Python (so much so that I'm considering going back to matplotlib for data analysis). But really, trying to figure out ROOT and Boost graph library and mathgl makes me want ...
1
vote
2answers
73 views

Help on writing sofware: general guidelines, in particular separation of computation and visualization

Although I already did some work in the intersection of theory and simulation I'm still very new to this field and I need some guidance. If anybody can give some recommendations for introductory ...
1
vote
1answer
63 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^...
1
vote
1answer
1k 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 ...
1
vote
1answer
76 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.
1
vote
1answer
802 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. ...
1
vote
1answer
490 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 ...
1
vote
1answer
357 views

Satisfying Periodic Boundary Conditions while plotting spherical particles inside a cube

I am trying to plot spherical particles in a cube of fixed dimension in matlab. I face a problem here where the center of the sphere is too close to the edge of the cube in this case the rest of the ...
1
vote
1answer
3k views

WRL and VRML to Matplotlib/Numpy

I would like to import (or parse ??) a WRL/VRML file format in python in order to work the data with Matplotlib. Is there any way of converting this file format into plottable numpy arrays ? I ...
1
vote
1answer
47 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 ...
1
vote
2answers
1k views

How to calculate grid coordinates of the centroid based on four attributes in a spider chart

04/06/15 After more research I found a candidate algorithm but it seems to be incomplete. I have also reworked the spider chart to number all of the boxes using an x,y ((origin = 1,1) lower left) ...
1
vote
2answers
11k views

How to plot probability density function in MATLAB?

I'm trying to get a frequency plot, or PDF (probability density function) plot for my biometrics project in MATLAB. I have two vectors genuine_scores and ...
1
vote
1answer
337 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 ...
1
vote
1answer
73 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 ...
1
vote
1answer
346 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 ...
1
vote
1answer
510 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 ...
1
vote
1answer
472 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 ...
1
vote
2answers
412 views

Generating 4D Plots in Matlab

I have some data in the form of: ...
1
vote
1answer
211 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 ...
1
vote
1answer
60 views

Visualizing certain sets

I'm not sure if this question is appropriate for this site, so I appologize in advance if it's not. For the purpose of a certain project I am working on, I would like to have the following sets ...
1
vote
1answer
572 views

What is Precision-Recall Curve? [closed]

I have a data mining assignment where I make a content-based image retrieval system. I have 20 images of 5 animals. So in total 100 images. My code returns the 10 most relevant images to an input ...
1
vote
1answer
80 views

Line scan in a 2D histogram

So I have a 2D histogram, in the third dimention are the counts. What I want to achieve is by choosing two random position, make a plot of a 1D histogram along the line that passes through the two ...
1
vote
0answers
133 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 ...
1
vote
0answers
1k 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 $\...
1
vote
0answers
109 views

How to curve fit an unknown function?

I have data which can be described by $y=f(x,z)$ where $z$ varies from 170 ~ 154. Now values given by $ks$ are known sample values that equals value given in the table header, $uks$ are unknown ...
1
vote
0answers
695 views

Plotting renormalization group flow diagram from recursion relation [closed]

How do I plot a flow diagram (given certain initial conditions, the trajectory in y-x space) for a RG (renormalization group) flow given by the following recursion relations? \begin{eqnarray} x^{\...
1
vote
0answers
979 views

algorithm Matlab function 'stream2' and 'stream3' use to compute streamline

Can anyone explain how the MATLAB functions: stream2(x,y,z,u,v,startx,starty) and stream3(x,y,z,u,v,startx,starty) compute stream lines from vector data u and v? In the stream2.m file, it calls the ...
0
votes
2answers
3k 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','...
0
votes
1answer
222 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. ...
0
votes
3answers
93 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 ...
0
votes
2answers
111 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 ...
0
votes
1answer
469 views

How to plot function with evenly spaced x values in Matlab

I'm trying to plot this function func=exp(x-sqrt(2))-cos(x-sqrt(2))-(x-sqrt(2)) in Matlab using 101 evenly spaced x values. If I just say ...