@BeginModule
@NewPage
@Name      = Ydaystat
@Title     = Multi-year daily statistical values
@Section   = Statistical values
@Class     = Statistic
@Arguments = ifile ofile
@Operators = ydaymin ydaymax ydaysum ydaymean ydayavg ydaystd

@BeginDescription
This module writes to @file{ofile}, according to the actual operator,
the minimum, maximum, sum, average or standard deviation of each 
day of year in @file{ifile}. The date information in an output field is 
the date of the last contributing input field.
@EndModule


@BeginOperator_ydaymin
@Title     = Multi-year daily minimum

@BeginDescription
@IfMan
o(001,x) = min{i(t,x), day(i(t)) = 001}
                 ...
o(366,x) = min{i(t,x), day(i(t)) = 366}
@EndifMan
@IfDoc
@BeginMath
\begin{array}{c}
o(\mbox{001},x) = \mbox{\bf min}\{i(t,x), \mbox{day}(i(t)) = \mbox{001}\} \\
\vdots \\
o(\mbox{366},x) = \mbox{\bf min}\{i(t,x), \mbox{day}(i(t)) = \mbox{366}\} \\
\end{array}
@EndMath
@EndifDoc
@EndDescription
@EndOperator


@BeginOperator_ydaymax
@Title     = Multi-year daily maximum

@BeginDescription
@IfMan
o(001,x) = max{i(t,x), day(i(t)) = 001}
                 ...
o(366,x) = max{i(t,x), day(i(t)) = 366}
@EndifMan
@IfDoc
@BeginMath
\begin{array}{c}
o(\mbox{001},x) = \mbox{\bf max}\{i(t,x), \mbox{day}(i(t)) = \mbox{001}\} \\
\vdots \\
o(\mbox{366},x) = \mbox{\bf max}\{i(t,x), \mbox{day}(i(t)) = \mbox{366}\} \\
\end{array}
@EndMath
@EndifDoc
@EndDescription
@EndOperator


@BeginOperator_ydaysum
@Title     = Multi-year daily sum

@BeginDescription
@IfMan
o(001,x) = sum{i(t,x), day(i(t)) = 001}
                 ...
o(366,x) = sum{i(t,x), day(i(t)) = 366}
@EndifMan
@IfDoc
@BeginMath
\begin{array}{c}
o(\mbox{001},x) = \mbox{\bf sum}\{i(t,x), \mbox{day}(i(t)) = \mbox{001}\} \\
\vdots \\
o(\mbox{366},x) = \mbox{\bf sum}\{i(t,x), \mbox{day}(i(t)) = \mbox{366}\} \\
\end{array}
@EndMath
@EndifDoc
@EndDescription
@EndOperator


@BeginOperator_ydaymean
@Title     = Multi-year daily mean

@BeginDescription
@IfMan
o(001,x) = mean{i(t,x), day(i(t)) = 001}
                 ...
o(366,x) = mean{i(t,x), day(i(t)) = 366}
@EndifMan
@IfDoc
@BeginMath
\begin{array}{c}
o(\mbox{001},x) = \mbox{\bf mean}\{i(t,x), \mbox{day}(i(t)) = \mbox{001}\} \\
\vdots \\
o(\mbox{366},x) = \mbox{\bf mean}\{i(t,x), \mbox{day}(i(t)) = \mbox{366}\} \\
\end{array}
@EndMath
@EndifDoc
@EndDescription
@EndOperator


@BeginOperator_ydayavg
@Title     = Multi-year daily average

@BeginDescription
@IfMan
o(001,x) = avg{i(t,x), day(i(t)) = 001}
                 ...
o(366,x) = avg{i(t,x), day(i(t)) = 366}
@EndifMan
@IfDoc
@BeginMath
\begin{array}{c}
o(\mbox{001},x) = \mbox{\bf avg}\{i(t,x), \mbox{day}(i(t)) = \mbox{001}\} \\
\vdots \\
o(\mbox{366},x) = \mbox{\bf avg}\{i(t,x), \mbox{day}(i(t)) = \mbox{366}\} \\
\end{array}
@EndMath
@EndifDoc
@EndDescription
@EndOperator


@BeginOperator_ydaystd
@Title     = Multi-year daily standard deviation

@BeginDescription
@IfMan
o(001,x) = std{i(t,x), day(i(t)) = 001}
                 ...
o(366,x) = std{i(t,x), day(i(t)) = 366}
@EndifMan
@IfDoc
@BeginMath
\begin{array}{c}
o(\mbox{001},x) = \mbox{\bf std}\{i(t,x), \mbox{day}(i(t)) = \mbox{001}\} \\
\vdots \\
o(\mbox{366},x) = \mbox{\bf std}\{i(t,x), \mbox{day}(i(t)) = \mbox{366}\} \\
\end{array}
@EndMath
@EndifDoc
@EndDescription
@EndOperator


@BeginExample
To compute the daily mean over all input years, use:
@BeginVerbatim
   cdo ydaymean ifile ofile
@EndVerbatim
@EndExample
