Rank: 155 based on 337 downloads (last 30 days) and 8 files submitted
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Jered Wells

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Company/University
Duke University
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36.00918579101562, -78.94168090820312

Personal Profile:

Medical Physics PhD Graduate Student studying x-ray imaging with a focus in noise/dose reduction and algorithm development.

Professional Interests:
Medical imaging, image processing

 

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08 May 2013 Center of Mass CENTEROFMASS finds the center of mass of the N-dimensional input array Author: Jered Wells physics, center of mass 27 0
03 May 2013 Screenshot Point cloud normal vector NORMND computes the vector normal to points in an N-D point cloud Author: Jered Wells eigenvector, eigenvalue, normal, vector, point cloud 26 0
24 Apr 2013 Norton-Beer apodization filter NORTONBEER produces a one-dimensional Norton-Beer apodization filter Author: Jered Wells apodization, filter 5 0
17 Apr 2012 Screenshot Lorentzian fit LORENTZFIT fits a single- or multi-parameter Lorentzian function to data Author: Jered Wells lorentz, fit, lorentzian, fitting, nonlinear 75 4
  • 4.0
4.0 | 1 rating
23 Mar 2012 Simpson's 1/3 and 3/8 rules SIMPSON: Simpson's rule for quadratic and cubic numerical integration Author: Jered Wells numerical, integration, simpsons rule, simpson, approximation, matlab 35 1
  • 5.0
5.0 | 1 rating
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26 Jun 2013 Bias Field Corrected Fuzzy C-Means Estimates the illumination artifact in 2D (color) and 3D CT and MRI and segments into classes. Author: Dirk-Jan Kroon

Update: I recently updated my machine, and after recompiling BCFCM3D, it appears to be working fine. I do, however, think the code would benefit from some free(*) statements within the mallocf and mallocd subfunctions. Although I am not a C-professional, I am pretty sure that this poses a significant memory leak that quickly becomes problematic when dealing with large volumes.

24 Jun 2013 Bias Field Corrected Fuzzy C-Means Estimates the illumination artifact in 2D (color) and 3D CT and MRI and segments into classes. Author: Dirk-Jan Kroon

Hi. I have been having memory issues with this code. I have been segmenting large volumes (512x512x512) so I have been monitoring my RAM consumption using Windows task manager. When running the program, it slowly but steadily consumes more RAM up until about 7GB (out of 16GB). This takes only about 2 min, but then the program runs for about 10 min and finally crashes with an "Out of Memory" error when more memory clearly exists. What's worse is that MATLAB holds onto this ~6GB chunk of memory, and no manner of memory clearing or packing gets it back. I am not a mex expert, so maybe you could shed some light on this issue? Thanks in advance.
10 May 2013 Stem and leaf plot This is a simple utility for making stem and leaf plots output to the command window. Author: Jered Wells

farfan: ROUNDN is a default MATLAB function. I'm not sure when it was released, but perhaps your version of MATLAB is older than R2008b? Check out the MATLAB documentation for more details: http://www.mathworks.com/help/map/ref/roundn.html

10 May 2013 R-square: The coefficient of determination RSQUARE is a simple routine for computing R-square (coefficient of determination). Author: Jered Wells

Oliver: Sorry for the late reply. In the case of linear regression (when an intercept or constant term is included in the model), my RSQUARE function and the square of MATLAB's CORR will produce the same result. However, RSQUARE provides the option of computing the R-square statistic using an alternate method which prevents negative R-square values which can occur when no constant term is included in the fit model. Please reference John D'Errico's comment below for more details.

Also, for convenience, my function produces the RMSE of the fit to the data.
17 Apr 2012 Lorentzian fit LORENTZFIT fits a single- or multi-parameter Lorentzian function to data Author: Jered Wells

Thank you, Ramu, for your comments. I trust that all of your questions have been answered.
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10 May 2013 Stem and leaf plot This is a simple utility for making stem and leaf plots output to the command window. Author: Jered Wells Wells, Jered

farfan: ROUNDN is a default MATLAB function. I'm not sure when it was released, but perhaps your version of MATLAB is older than R2008b? Check out the MATLAB documentation for more details: http://www.mathworks.com/help/map/ref/roundn.html

10 May 2013 R-square: The coefficient of determination RSQUARE is a simple routine for computing R-square (coefficient of determination). Author: Jered Wells Wells, Jered

Oliver: Sorry for the late reply. In the case of linear regression (when an intercept or constant term is included in the model), my RSQUARE function and the square of MATLAB's CORR will produce the same result. However, RSQUARE provides the option of computing the R-square statistic using an alternate method which prevents negative R-square values which can occur when no constant term is included in the fit model. Please reference John D'Errico's comment below for more details.

Also, for convenience, my function produces the RMSE of the fit to the data.
27 Aug 2012 R-square: The coefficient of determination RSQUARE is a simple routine for computing R-square (coefficient of determination). Author: Jered Wells Oliver

Hi,

is there a difference between this function and using the square of the Matlab function corr(x,y)

since
x = 0:0.1:10;
y = 2.*x + 1 + randn(size(x));
p = polyfit(x,y,1);
f = polyval(p,x);
[r2 rmse] = rsquare(y,f);

and corr(x',y')^2

gives the same result for r2.
23 Aug 2012 R-square: The coefficient of determination RSQUARE is a simple routine for computing R-square (coefficient of determination). Author: Jered Wells Kuhs, Manuel

Perfect! Does exactly what it says. Time saved!
19 Jul 2012 Stem and leaf plot This is a simple utility for making stem and leaf plots output to the command window. Author: Jered Wells farhan

I tried the example code but got an error.

>> V = randn(1,50);
>> stemleafplot(V,-1)
Undefined function 'roundn' for input arguments of type 'double'.

Error in stemleafplot (line 55)
v = roundn(v,p);

Does this roundn refer to this function?

http://www.mathworks.com/matlabcentral/fileexchange/37067-roundnxn-returns-x-rounded-to-n-digits

Top Tags Applied by Jered
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fit, statistics, 3d, apodization, approximation
Files Tagged by Jered View all
  • 1 - 5 of
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Updated   File Tags Downloads
(last 30 days) 		Comments Rating
08 May 2013 Center of Mass CENTEROFMASS finds the center of mass of the N-dimensional input array Author: Jered Wells physics, center of mass 27 0
03 May 2013 Screenshot Point cloud normal vector NORMND computes the vector normal to points in an N-D point cloud Author: Jered Wells eigenvector, eigenvalue, normal, vector, point cloud 26 0
24 Apr 2013 Norton-Beer apodization filter NORTONBEER produces a one-dimensional Norton-Beer apodization filter Author: Jered Wells apodization, filter 5 0
17 Apr 2012 Screenshot Lorentzian fit LORENTZFIT fits a single- or multi-parameter Lorentzian function to data Author: Jered Wells lorentz, fit, lorentzian, fitting, nonlinear 75 4
  • 4.0
4.0 | 1 rating
23 Mar 2012 Simpson's 1/3 and 3/8 rules SIMPSON: Simpson's rule for quadratic and cubic numerical integration Author: Jered Wells numerical, integration, simpsons rule, simpson, approximation, matlab 35 1
  • 5.0
5.0 | 1 rating

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