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From: Walter Roberson on 23 Jun 2010 18:18
Doug Weathers wrote:

> The function WEEKDAY appears to reduce to the formula
>
> weekday = mod(datenum-2, 7) + 1;

How could that take care of leap years??


> while HOLIDAYS merely contains a long list of date numbers for New York
> Stock Exchange holidays from 1950 to 2050. It returns the holidays
> between the given datenums.
> To reproduce it, you could type in a list of your particular holidays
> from a calendar into a vector, then check to see if your datenum is a
> member of that set with ISMEMBER.

You would probably want to fix() the datenum before doing ismember so that the
fractions of a day don't throw you off.
From: Loren Shure on 24 Jun 2010 07:14
In article <9e358331-2765-4d86-a871-a93eb8bdc3b5
@b5g2000vbl.googlegroups.com>, lunamoonmoon(a)gmail.com says...
> It's like this:
>
> Today is 6/22/2010, last year's today is 6/22/2009, and today 2 years
> agoo is 6/22/2008.
>
> This is simple to do in Matlab.
>
> How about what about business days and weekend...?
>
> I am looking for something like today in last year...
>
> but if that was a weekend or holiday,
>
> then I would like the date before that and the date after that.
>
> How to do this in Matlab?
>
> Thanks
>

Check this out for a start:
http://blogs.mathworks.com/loren/2010/06/11/simple-date-manipulations/

--
Loren
http://blogs.mathworks.com/loren
http://matlabwiki.mathworks.com/MATLAB_FAQ
From: Doug Weathers on 24 Jun 2010 13:32
Walter Roberson <roberson(a)hushmail.com> wrote in message <hvu1bm$i9o$1(a)canopus.cc.umanitoba.ca>...
> Doug Weathers wrote:
>
> > The function WEEKDAY appears to reduce to the formula
> >
> > weekday = mod(datenum-2, 7) + 1;
>
> How could that take care of leap years??

By ignoring them :)

Weekdays keep cycling from Sunday to Saturday without regard to the date. That's why the simple formula above works all the way back to day zero (1-1-0000).

>
> You would probably want to fix() the datenum before doing ismember so that the
> fractions of a day don't throw you off.

Of course I ignored all error checking for the sake of the example. By all means, validate your input!
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