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eomday extension for wrapping month numbers

Asked by Walter Roberson on 24 Apr 2012

eomday() does not handle situations where the month number is greater than 12, such as

eomday(2012, 3:15)

to mean March 2012 through March 2013. The user cannot use something like,

eomday([2012, 2013], {3:12, 1:3})

as eomday does not handle cell arrays and eomdays requires that either at least one argument be a scalar or else that the number of years matches the number of months.

This situation is not fatal, but it can be inconvenient.

I therefore propose an extension to eomday() to handle month wrap-arounds. My extension code still requires that one or both arguments be scalars, but provides a bit more convenience.

The code change is the last few days of eomday, and replaces the last 2 lines of code with

madj = 1+mod(m-1,12);
yadj = y + floor((m-1)/12);
d(:) = dpm(madj);
d((madj == 2) & ((rem(yadj,4) == 0 & rem(yadj,100) ~= 0) | rem(yadj,400) == 0)) = 29;

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Walter Roberson

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1 Answer

Answer by Leah on 2 May 2012
eomday([2012, 2013], {3:12, 1:3})

would work like this

eomday([repmat(2012,1,10) repmat(2013,1,3)], [3:12  1:3])

Use datevec on time series data then use the month year vectors in eomday when I'm converting to average daily

dates=datenum('1/1/2010'):datenum(date());
dv=datevec(dates);
countdays=eomday(dv(:,1), dv(:,2));

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Leah

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