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Travis Knepp


24 total contributions since 2010

Post-doctoral research at NASA Langley.
Professional Interests: Data analysis

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File Merge Speed Improvement
Ok, you are right. This is really an abbreviated portion of my script. I should have posted the real thing. My apologies. Be...

5 years ago | 0

Question


File Merge Speed Improvement
I have a script written to merge several data sets containing data (shocker!) that all have different time stamp frequencies. A...

5 years ago | 3 Answers | 0

3

answers

Responded


Re: Find min difference in matrices time series
Ok, it seems solution one is my best option. I am constantly using/updating these files and was hoping for an elegant/fast prog...

5 years ago | 2945 views

Responded


Re: Find min difference in matrices time series
Thanks for the tips. I'll probably go with the interpolation solution. It may require more up-front time, but should speed up ...

5 years ago | 2945 views

Responded


Re: Find min difference in matrices time series
Ok, I think I see what you are saying. You mean, for example, take the data set with highest temporal resolution (say, minutely...

5 years ago | 2945 views

Posted


Find min difference in matrices time series
Oftentimes I work with large sets of data (time series) that are not nicely consistent. For example, I'll have two matrices of ...

5 years ago | 2945 views

Responded


Re: Add column to .txt file
I see...that is what I suspected/feared. I guess a transposed matrix will have to do! Thanks for the info.

6 years ago | 5569 views

Posted


Add column to .txt file
I'm analyzing a series of data files that consist of 640 rows, and one column per file. Instead of building a giant matrix in m...

6 years ago | 5569 views

Responded


Re: Getting data from GUI callback into function...
HA, GOT IT!! Ok, since "clicky" is not a callback, it does not get passed the handle list (which happens to be called handles...

6 years ago | 5767 views

Responded


Re: Getting data from GUI callback into function...
For the sake of completeness, here is the entire error message I am getting: ??? Input argument "handles" is undefined. Erro...

6 years ago | 5767 views

Responded


Re: Getting data from GUI callback into function...
Thanks. I was using the value property because I was trying to avoid converting string to number, despite the process being tri...

6 years ago | 5767 views

Posted


Getting data from GUI callback into function...
I'm finishing a GUI and trying to avoid global variables in passing data between callbacks/functions etc. I'm using GUIDE. I...

6 years ago | 5767 views

Responded


Re: Store data by clicking on data point in plot
Ok, thanks. I finally got time to look back at this (finally getting caught up...). That solved that problem, it was pretty si...

6 years ago | 2153 views

Posted


Store data by clicking on data point in plot
I'm building a GUI to plot a series of data sets (plotting one at a time, click "next" and the next data set is plotted, the old...

6 years ago | 2153 views

Posted


Remove plot dead space in weekly plot
Thanks. At first I didn't think this would work...but it worked beautifully. A nice, simple solution.

6 years ago | 2080 views

Posted


Remove plot dead space in weekly plot
I'm plotting data that is date/time stamped. I've separated the data according to day of week (via weekday), and averaged each ...

6 years ago | 2080 views

Responded


Re: average of a matrix
Could download the NaNsuite as posted by Jan Gläscher. http://www.mathworks.com/matlabcentral/fileexchange/6837

6 years ago | 1724 views

Responded


Re: avoid for
What is it, exactly, that you are trying to do? I'm having a hard time following the script you provided to determine what the ...

6 years ago | 3206 views

Posted


Wind barb plots
I'm trying to plot wind data (I have altitude, time, and wind vector (u and v) data) and would like to plot the data as wind bar...

6 years ago | 1891 views

Posted


Wind barb plots
I'm trying to plot wind data (I have altitude, time, and wind vector (u and v) data) and would like to plot the data as wind bar...

6 years ago | 4470 views

Responded


Re: Time stamp ruing plots!
Ok, ok. My apologies for leaving the details lacking...let's not ruffle our panties. In gps_time I store my date/time in form...

6 years ago | 4199 views

Responded


Re: Help with graphing please
You need to specify the marker you want, otherwise MatLab always "connects the dots". Type "help plot" in the command prompt fo...

6 years ago | 830 views

Responded


Re: Help with graphing please
You need to specify the marker you want, otherwise MatLab always "connects the dots". Type "help plot" in the command prompt fo...

6 years ago | 830 views

Posted


Time stamp ruing plots!
I received an m file from a previous employee, who is not communicating, so I am unsure what exactly he is doing in his script. ...

6 years ago | 4199 views