Rank: 1395 based on 79 downloads (last 30 days) and 3 files submitted
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Diederick

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The University of Hong Kong

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Files Posted by Diederick View all
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02 Feb 2012 MergeCell Merges contents of multiple cell arrays into one big cell array, with expansion Author: Diederick cell, append, concat 8 4
  • 2.0
2.0 | 1 rating
21 Jun 2011 Screenshot histograms for ND data Create histograms for ND data using ND bins Author: Diederick histogram, nd data, 2d, 3d, statistics 12 0
  • 5.0
5.0 | 1 rating
04 Feb 2011 Savitzky-Golay smooth/differentiation filters and filter application Routine to generate Savitzky-Golay smoothing and differentiation filters and routine to apply these Author: Diederick filtering, differentiation, smoothing, savitzkygolay 59 15
  • 5.0
5.0 | 3 ratings
Comments and Ratings by Diederick View all
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29 Jan 2014 Savitzky-Golay smooth/differentiation filters and filter application Routine to generate Savitzky-Golay smoothing and differentiation filters and routine to apply these Author: Diederick

By the way, the I signal submission that is linked to this submission may be of use for you to figure things out, it made to learn. You can also look at its implementation later to see how things work

29 Jan 2014 Savitzky-Golay smooth/differentiation filters and filter application Routine to generate Savitzky-Golay smoothing and differentiation filters and routine to apply these Author: Diederick

I realize the help is a little short:
x is not your data, it is the filter window (hence e.g. -5:5 for a window of 11). the larger the window, the more smoothing. it corresponds to the length of the polynomial (in number data points) that is convoluted with the data. n= polynomial order (5 is kinda high, try 2 or 3 first). Third input x0 is at what point the polynomial is evaluated. keeping things symmetric, leave it to its default of zero (the middle of the window specified in the first input).

All this said, this area is not appropriate for these kind of questions, its only for feedback on my submission. please use the matlab mailing list: http://www.mathworks.com/matlabcentral/newsreader/

28 Jan 2014 Savitzky-Golay smooth/differentiation filters and filter application Routine to generate Savitzky-Golay smoothing and differentiation filters and routine to apply these Author: Diederick

All correct. savitzkyGolayFilt outputs the smoothed values. Just try it out!

28 Jan 2014 Savitzky-Golay smooth/differentiation filters and filter application Routine to generate Savitzky-Golay smoothing and differentiation filters and routine to apply these Author: Diederick

Hi Harish,

1. Indeed, you do filtering by convolution. Or see the implementation in savitzkyGolayFilt that is also in the submission, it's more careful about values at the edges and such.
2. No, these are the coefficients that in a sense fit and then evaluate a polynomial (various orders in there). See a description of how this type of filter works to know what I mean.

Hope that helps,
Dee

11 May 2012 Savitzky-Golay smooth/differentiation filters and filter application Routine to generate Savitzky-Golay smoothing and differentiation filters and routine to apply these Author: Diederick

Hi David,

I'm actually not sure what you mean by "smooth at the level of 26nm". Maybe its better to ask on the matlab mailing list (see newsgroup in the navigation menu).

Best,
Dee

Comments and Ratings on Diederick's Files View all
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10 Apr 2014 Savitzky-Golay smooth/differentiation filters and filter application Routine to generate Savitzky-Golay smoothing and differentiation filters and routine to apply these Author: Diederick Stoica, Mircea

29 Jan 2014 Savitzky-Golay smooth/differentiation filters and filter application Routine to generate Savitzky-Golay smoothing and differentiation filters and routine to apply these Author: Diederick Diederick

By the way, the I signal submission that is linked to this submission may be of use for you to figure things out, it made to learn. You can also look at its implementation later to see how things work

29 Jan 2014 Savitzky-Golay smooth/differentiation filters and filter application Routine to generate Savitzky-Golay smoothing and differentiation filters and routine to apply these Author: Diederick Diederick

I realize the help is a little short:
x is not your data, it is the filter window (hence e.g. -5:5 for a window of 11). the larger the window, the more smoothing. it corresponds to the length of the polynomial (in number data points) that is convoluted with the data. n= polynomial order (5 is kinda high, try 2 or 3 first). Third input x0 is at what point the polynomial is evaluated. keeping things symmetric, leave it to its default of zero (the middle of the window specified in the first input).

All this said, this area is not appropriate for these kind of questions, its only for feedback on my submission. please use the matlab mailing list: http://www.mathworks.com/matlabcentral/newsreader/

28 Jan 2014 Savitzky-Golay smooth/differentiation filters and filter application Routine to generate Savitzky-Golay smoothing and differentiation filters and routine to apply these Author: Diederick Muppirisetty, SreeHarish

Thank you for making it clear.
I am using the below command to get my Bform (splines) and differentials
[BformESsgolay,dESsgolay]=savitzkyGolay(ESnoisydata{experimentindex}(1:1000),5,1,99);
When I run this in debug mode, and check my dESsgolay it is of size noofdatapointsininputnoisysignalX 6. I expected a 1-d vector, Can you give me pointers so that I can learn, to fill the gap I am having at this point? my aim is to calculate first order derivatives from the output differentials.
Thanks for your time and helping me learn.

28 Jan 2014 Savitzky-Golay smooth/differentiation filters and filter application Routine to generate Savitzky-Golay smoothing and differentiation filters and routine to apply these Author: Diederick Diederick

All correct. savitzkyGolayFilt outputs the smoothed values. Just try it out!

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