NuclearPhynance Archive

I know it's a small threadjack but: earlier in this thread we discussed the speed of R vs Matlab. I've just found http://www.cybaea.net/Blogs/Data/Faster-R-through-better-BLAS.html which describes different ways of speeding up R. Hope this helps someone...

Actually I don't really need it right now, but thanks for the link. This sounds interesting and is good to know it exists. Thanks

Another note on R Performance: For Intel Machines the fastest solution is to link against Intel MKL. Revolution R gives you optimized Builds out of the box under windows. For Linux Users a Revolution version is available for Ubuntu (but only R2.9.2). A general installation tutorial for Linux can be found at: http://psyccomputing.blogspot.com/2010/04/compiling-64-bit-r-2101-with-mkl-in.html - i used that to speed up my Amazon Cloud Environment.

Hi all



I need a (1xN) vector of dates in the following format "yyyymmdd" (i.e. 19960101) for a for-loop.



start_date = datenum('01-Jan-1996');

end_date = datenum('31-Dec-2012');



date = datevec(start_date:1:end_date);



How should I proceed?



Thx for your help!!

If you're looking to get the data into a vector of formatted strings you could use the built-in datestr command.



dateString = datestr(date,'yyyymmdd');



Hope that helps.

Thx for that, djfostner.



Unfortunately, I had this before and I dont know how to access/use the first, second etc. value in dateString.



Afterwards I would like to use sprintf in a for-loop to combine a hyperlink with the date in the above mentioned vector.



Thx again

in approximate order of complexity (and reverse order of speed):



use a for loop with datestr()



or



use cellfun()



or

use a custom-written loop using preallocated strings for numbers from 1 to 12, 1 to 31, and 0 to 99. date-related functions in matlab are notoriously slow.

Ok this might be a real basic question but I am unsure of how to do this.



I would like to set my machine timezone from matlab to another timezone whilst running a script in matlab and then convert it back. How would I do this actually or is this possible?

I can give you a script that will do this, but may I ask:  is this for string formatting purposes?  There may be better alternatives.  If for no other reason, you're going to mess up your calendar if you keep switching back and forth - any invite that gets received during this time has high probability of getting jacked. 



Here's a Matlab example of converting local to UTC, although you're going to need Java installed for this to run (and CLASSPATH set in Matlab)



http://www.mathworks.com/matlabcentral/fileexchange/22295-localtimetoutc/content/local_time_to_utc.m

Thanks! And no it is not for date formating, I actually have to call an executable file that requires my timezone as an input and I cannot recompile this file since I do not have the source code.



Don't worry I do not have many invites so this patch work will do!