intervals

I have thousands of entries in hkdata.2 and I want to create a loop that can help me to sum up the total exposed mxtemp from another data frame data.1 for each member in each houseID in data.2 Could any expert give me a hand on this? weather.data date mpressure mxtemp 1 2008-01-01 1025.3 15.7 2 2008-01-02 1025.6 16.0 3 2008-01-03 1023.6 18.1 4 2008-01-04 1021.8 18.4 5 2008-01-05 1020.1 20.9 6 2008-01-06 1019.7 20.7 7 2008-01-07 1018.4 24.0 8 2008-01-08 1016.7 23.7 hkdata.2 row.names houseID member male date.end date.begin 1 1 1 1 2008-01-07 2008-01-02 2 1 2 0 2008-01-06 2008-01-04 I want to

using Qt 4.8 how can I print the time in the format DD HH SS? I have the seconds and I want to get back a string in that format. cor3ntin QDateTime::fromTime_t(seconds).toString("ss hh DD"); see http://qt-project.org/doc/qt-5.0/qdatetime.html#toString If you want a duration ( your question was really unclear) try something like : QString seconds_to_DHMS(quint32 duration) { QString res; int seconds = (int) (duration % 60); duration /= 60; int minutes = (int) (duration % 60); duration /= 60; int hours = (int) (duration % 24); int days = (int) (duration / 24); if((hours == 0)&&(days == 0)) return

Let's say I have a datetime, June 16 2011 at 7:00. I want to be able to check at, say, August 5 2011 at 7:00 and be able to tell that it is exactly a multiple of 1 day since the first date, whereas 7:01 would not count, since it is not an exact multiple. Another test set: Let's say we have June 16 2011 at 7:00, and I want to check if a particular minute is within an interval of exactly 2 hours since then. So 9:00, 11:00, 13:00, etc. would count, but 9:30 and 10:00 would not. And this could continue for days and months - September 1 at 7:00 would still count as within every 2 hours. (And no, at

Sorry if this has already been posted but I looked really hard and could not find anything. I am working with monthly temperature observations for 30 years, comprising January 1960 to December 1989. It looks like this: > head(df) date temp 1 1960-01-01 22.92235 2 1960-02-01 23.07059 3 1960-03-01 23.10941 4 1960-04-01 20.78353 5 1960-05-01 17.45176 6 1960-06-01 17.31765 First, what I need to do is to average all januaries, februaries, marches and etc for the whole period. Then, I would like to do the same for specific periods of time (3 years, 5 years, 10 years etc). For example, The average of

I have a huge database table with n integer intervals (for instance {1-5}, {4-16}, {6434-114343}) and need to find out which intervals overlap each other . There's a wealth of similar questions on SO , but the difference is I need returned, for each interval respectively, the set of overlapping intervals. ------------------ A ------------------- ------ B ------- ----- D ----- --------- C --------- For this example, output would be A:{B,C,D} B:{A,C} C:{A,B} D:{A} Worst case, all intervals could overlap each other, producing an output of size O( n 2 ). This is no better than the naïve solution