dtDayofYear¶

Purpose¶

Extracts the day of the year component from a date/time variable as a decimal number (1-366).

Format¶

doy = dtDayofYear(X[, column])¶

Parameters:

X (TxK dataframe) – Data with metadata.
column (Scalar or string) – Optional, name or index of the date variable in X to get days of the year from. Default = first column.

Returns:

doy (Tx1 vector) – The day of the year of the dates in the column specified by column.

Examples¶

// Load data
fname = getGAUSSHome("examples/yellowstone.csv");
data = loadd(fname);

// Get day of the year for date column
doy = dtDayofYear(data, "Date");

// Print first and last five dates
head(data[., "Date"]);
tail(data[., "Date"]);

// Print corresponding years
"Day of Year:"
head(doy);
tail(doy);

The code above prints the following table:

        Date
  2016/01/01
  2015/01/01
  2014/01/01
  2013/01/01
  2012/01/01

        Date
  1990/12/01
  1989/12/01
  1988/12/01
  1987/12/01
  1986/12/01

Day of Year:

           1
           1
           1
           1
           1

         335
         335
         336
         335
         335