Rank: 275 based on 301 downloads (last 30 days) and 17 files submitted
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Tristan Ursell

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Company/University
Stanford University

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Professional Interests:
physics, biophysics, genetic algorithms

 

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Files Posted by Tristan View all
Updated   File Tags Downloads
(last 30 days)
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08 Nov 2013 Screenshot Active Figure Zoom for Selecting Points Select points at a user-specified zoom level that moves around the image as you click. Author: Tristan Ursell figure, zoom, select, points, line, ginput 16 0
29 Oct 2013 Screenshot Adaptive Colormap Function Creates a Colormap Specific to Data Easily design and fit a colormap to the values in your data! Author: Tristan Ursell color, red, blue, green, colormap, map 8 3
30 Sep 2013 Connect Randomly Ordered 2D Points into a Minimal Nearest-Neighbor Closed Contour Connects randomly ordered 2D points into a minimal nearest neighbor contour. Author: Tristan Ursell contour, nearest, neighbor, 2d, point, points 33 14
  • 4.5
4.5 | 5 ratings
09 Jul 2013 Screenshot 1D Non-derivative Peak Finder Up-sample and filter noisy data to find peaks without using derivatives. Author: Tristan Ursell signal processing, interpolation, measurement, peak, location, finding 25 5
  • 5.0
5.0 | 2 ratings
28 May 2013 Screenshot Frechet Distance Calculator Estimate the similarity between curves in space using the scalar Frechet Distance. Author: Tristan Ursell curve, curves, path, space, space curve, distance 27 1
  • 5.0
5.0 | 2 ratings
Comments and Ratings by Tristan View all
Updated File Comments Rating
26 Oct 2013 Adaptive Colormap Function Creates a Colormap Specific to Data Easily design and fit a colormap to the values in your data! Author: Tristan Ursell

Hey Blake -- found the single character bug that caused this! Be careful with the "<" vs. "<=" :)

29 Sep 2013 Connect Randomly Ordered 2D Points into a Minimal Nearest-Neighbor Closed Contour Connects randomly ordered 2D points into a minimal nearest neighbor contour. Author: Tristan Ursell

Zheng -- found a small bug that was responsible. New version uploaded, and awaiting approval from Mathworks (or just add "bad_pts=zeros(size(Xin));") at line 235. Thanks!

29 Sep 2013 Connect Randomly Ordered 2D Points into a Minimal Nearest-Neighbor Closed Contour Connects randomly ordered 2D points into a minimal nearest neighbor contour. Author: Tristan Ursell

Hi Zheng, I presume this was with the last example? I'll take a look.

15 Aug 2013 Image Noise Reduction by Local Statistics Reduce image noise by measuring local pixel statistics and remapping intensities. Author: Tristan Ursell

@ Krishna, what exactly do you mean by "unknown scaling" -- the output image is the same size as the input image, so there's no scaling there, and the intensity values are not scaled, they are of course adjusted by the calculation itself. You can subtract the input from the output and verify that it removes (mostly) noise ... and hence there is no scaling.

I designed this filter, but it is something like a cross between an averaging and median filter.

If this clarified things for you, please consider re-rating this to 5 stars.

13 Aug 2013 Connect Randomly Ordered 2D Points into a Minimal Nearest-Neighbor Closed Contour Connects randomly ordered 2D points into a minimal nearest neighbor contour. Author: Tristan Ursell

@Roy, I included the requested feature late last month.

Comments and Ratings on Tristan's Files View all
Updated File Comment by Comments Rating
23 Aug 2014 Connect Randomly Ordered 2D Points into a Minimal Nearest-Neighbor Closed Contour Connects randomly ordered 2D points into a minimal nearest neighbor contour. Author: Tristan Ursell Pennekamp, Frank

Hi,
This is a great function you've made here! But I was wondering if it is possible to find multiple closed contours in one X and Y vector?

maybe using an if statement when the starting point is closer than any other data point it closes the contour and starts a new one on the next point of your vector?

I think this would be a very nice addition to your program for when your working with big spatial datasets.

Cheers

30 Jan 2014 Frechet Distance Calculator Estimate the similarity between curves in space using the scalar Frechet Distance. Author: Tristan Ursell R, Venkat

Nice submission. Has great potential application.

26 Oct 2013 Adaptive Colormap Function Creates a Colormap Specific to Data Easily design and fit a colormap to the values in your data! Author: Tristan Ursell Ursell, Tristan

Hey Blake -- found the single character bug that caused this! Be careful with the "<" vs. "<=" :)

23 Oct 2013 Random Numbers from a Discrete Distribution Simple algorithm to generate random numbers from a user-defined discrete probability distribution. Author: Tristan Ursell Senthil

Thanks. It helped me in my program

29 Sep 2013 Connect Randomly Ordered 2D Points into a Minimal Nearest-Neighbor Closed Contour Connects randomly ordered 2D points into a minimal nearest neighbor contour. Author: Tristan Ursell Ursell, Tristan

Zheng -- found a small bug that was responsible. New version uploaded, and awaiting approval from Mathworks (or just add "bad_pts=zeros(size(Xin));") at line 235. Thanks!

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