@BeginModule
@NewPage
@Name      = Intyear
@Title     = Year interpolation
@Section   = Interpolation
@Class     = Interpolation
@Arguments = ifile1 ifile2 oprefix
@Operators = intyear
@EndModule


@BeginOperator_intyear
@Title     = Interpolation between two years
@Parameter = years

@BeginDescription
This operator performs linear interpolation between two years
time step by time step. Appends four digits with the year to 
@file{oprefix} to form the output file names.
@EndDescription

@BeginParameter years
@Item = years
INTEGER  Comma separated list of years
@EndParameter
@EndOperator


@BeginExample
Assume there are two monthly mean datasets over a year.
The first dataset has 12 time steps for the year 1985
and the second one for the year 1990.
To interpolate the years between 1985 and 1990 month
by month use:
@BeginVerbatim
   cdo intyear,1986,1987,1988,1989 ifile1 ifile2 year
@EndVerbatim
Example result of '{\tt dir year*}' for netCDF datasets:
@BeginVerbatim
   year1986.nc year1987.nc year1988.nc year1989.nc
@EndVerbatim
@EndExample
