How calculate the diurnal and semi-diurnal cycle of 3-hourly precipitation by a harmonics analysis?

                               Hi NCL group!

                 I am try to calculate and plot the diurnal and
semi-diurnal cycle
             of 3-hourly precipitation by a harmonics analysis but the
result for
             the plot not very satisfy me.
                The harmonics analysis of a time series is the
decomposition of a
             periodic function into a sum of trigonometric functions.
                What can i do?
             Can anyone suggest a script NCL to calculate and to plot
in xy_plot
           and spatial plot(Lat,Lon) the first and the sd harmonics?
           You will see attach with this note the formulas who explain
this calcul

                                    Thanks in advance....
                                    paul chris.
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Received on Tue Jun 17 06:29:01 2014