select: Select fields

In rcdo: Wrapper of 'CDO' Operators

Select fields

Description

This module selects some fields from infiles and writes them to outfile. infiles is an arbitrary number of input files. All input files need to have the same structure with the same variables on different timesteps. The fields selected depends on the chosen parameters. Parameter is a comma-separated list of "key=value" pairs. A range of integer values can be specified by first/last[/inc]. Wildcards are supported for string values.

Usage

cdo_delete(
  ifiles,
  name = NULL,
  param = NULL,
  code = NULL,
  level = NULL,
  levrange = NULL,
  levidx = NULL,
  zaxisname = NULL,
  zaxisnum = NULL,
  ltype = NULL,
  gridname = NULL,
  gridnum = NULL,
  steptype = NULL,
  date = NULL,
  startdate = NULL,
  enddate = NULL,
  minute = NULL,
  hour = NULL,
  day = NULL,
  month = NULL,
  season = NULL,
  year = NULL,
  dom = NULL,
  timestep = NULL,
  timestep_of_year = NULL,
  timestepmask = NULL,
  ofile = NULL
)

cdo_select(
  ifiles,
  name = NULL,
  param = NULL,
  code = NULL,
  level = NULL,
  levrange = NULL,
  levidx = NULL,
  zaxisname = NULL,
  zaxisnum = NULL,
  ltype = NULL,
  gridname = NULL,
  gridnum = NULL,
  steptype = NULL,
  date = NULL,
  startdate = NULL,
  enddate = NULL,
  minute = NULL,
  hour = NULL,
  day = NULL,
  month = NULL,
  season = NULL,
  year = NULL,
  dom = NULL,
  timestep = NULL,
  timestep_of_year = NULL,
  timestepmask = NULL,
  ofile = NULL
)

Arguments

ifiles	Character vector with the path to the input files.
name	STRING - Comma-separated list of variable names.
param	STRING - Comma-separated list of parameter identifiers.
code	INTEGER - Comma-separated list or first/last[/inc] range of code numbers.
level	FLOAT - Comma-separated list of vertical levels.
levrange	FLOAT - First and last value of the level range.
levidx	INTEGER - Comma-separated list or first/last[/inc] range of index of levels.
zaxisname	STRING - Comma-separated list of zaxis names.
zaxisnum	INTEGER - Comma-separated list or first/last[/inc] range of zaxis numbers.
ltype	INTEGER - Comma-separated list or first/last[/inc] range of GRIB level types.
gridname	STRING - Comma-separated list of grid names.
gridnum	INTEGER - Comma-separated list or first/last[/inc] range of grid numbers.
steptype	STRING - Comma-separated list of timestep types (constant|avg|accum|min|max|range|diff|sum)
date	STRING - Comma-separated list of dates (format: YYYY-MM-DDThh:mm:ss).
startdate	STRING - Start date (format: YYYY-MM-DDThh:mm:ss).
enddate	STRING - End date (format: YYYY-MM-DDThh:mm:ss).
minute	INTEGER - Comma-separated list or first/last[/inc] range of minutes.
hour	INTEGER - Comma-separated list or first/last[/inc] range of hours.
day	INTEGER - Comma-separated list or first/last[/inc] range of days.
month	INTEGER - Comma-separated list or first/last[/inc] range of months.
season	STRING - Comma-separated list of seasons (substring of DJFMAMJJASOND or ANN).
year	INTEGER - Comma-separated list or first/last[/inc] range of years.
dom	STRING - Comma-separated list of the day of month (e.g. 29feb).
timestep	INTEGER - Comma-separated list or first/last[/inc] range of timesteps. Negative values select timesteps from the end (NetCDF only).
timestep_of_year	INTEGER - Comma-separated list or first/last[/inc] range of timesteps of year.
timestepmask	STRING - Read timesteps from a mask file.
ofile	String with the path to the output file.

Details

select  Select fields
        Selects all fields with parameters in a user given list.
delete  Delete fields
        Deletes all fields with parameters in a user given list.

Value

Operators that output one or more files return a character vector to the output files.

Operators that output an indefinite number of files return a string with the basename of the files.

Operatos that don't return filenames return a character vector with the string output.

rcdo documentation built on June 8, 2025, 12:36 p.m.