Time
time_1.ncl: Create an integer time
coordinate variable of the type 199801,199802 etc
for multiple years.
ispan is used to create an integer array of both years and months.
sprinti is used to convert the year and month arrays to string arrays so that they can be concatenated together.
stringtointeger then converts the concatenated string back to an integer. You could leave the time coordinate as a string array or create a separate date array that would be a string. This would be useful for later labeling of a plot.
Note that the contributed.ncl function yyyymm_to_yyyyfrac could be used instead of the process described above to create a YYYYMM array of type float of double. See example 3 below.
ispan is used to create an integer array of both years and months.
sprinti is used to convert the year and month arrays to string arrays so that they can be concatenated together.
stringtointeger then converts the concatenated string back to an integer. You could leave the time coordinate as a string array or create a separate date array that would be a string. This would be useful for later labeling of a plot.
Note that the contributed.ncl function yyyymm_to_yyyyfrac could be used instead of the process described above to create a YYYYMM array of type float of double. See example 3 below.
time_2.ncl: Demonstrates using
ut_calendar
to convert a mixed Julian/Gregorian date to a UT-referenced date, and then demonstrates using
ut_inv_calendar to go from
a UT-referenced date to a mixed Julian/Gregorian date.
time_3.ncl: Demonstrates how to use the
contributed.ncl function
yyyymm_to_yyyyfrac to set up a monthly time
array useful for plotting purposes. The top panel shows a random-generated timeseries plotted along an X-axis
set up using yyyymm_to_yyyyfrac. The middle
plot shows the result of using tmXBPrecision
to set up the number of significant digits shown in the bottom X-axis tickmark labels. The bottom panel shows how
to include carriage returns in tick mark labels such that the formatting is similar to:
Jan Feb
2000 2000
Carriage returns are created in text strings by utilizing your
text function code surrounding a C. (ex. ~C~)