Questions tagged [plotting]

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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
9k 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 ...
1
vote
0answers
993 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
1answer
1k views

Border Mapping of Scatter plot

I have scatter plot and I want to trace the border of that. for example: Plot: and I wanted it traced: Or at least wanted to know the border points? Also, is it possible to detect if any point ...
6
votes
2answers
926 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 ...
1
vote
1answer
62 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
4k 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
579 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 ...
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 ...
1
vote
2answers
12k 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
84 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 ...
11
votes
2answers
10k 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: ...
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 ...
2
votes
1answer
2k 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 ...
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/...

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