# Save objects of class 's2dv_cube' to data in NetCDF format This function allows to divide and save a object of class 's2dv_cube' into a NetCDF file, allowing to reload the saved data using `CST_Start` or `CST_Load` functions. It also allows to save any 's2dv_cube' object that follows the NetCDF attributes conventions. ```r CST_SaveExp( data, destination = tempdir(), startdates = NULL, sdate_dim = "sdate", ftime_dim = "time", memb_dim = "member", dat_dim = "dataset", var_dim = "var", drop_dims = NULL, single_file = FALSE, extra_string = NULL, global_attrs = NULL, units_hours_since = FALSE ) ``` ## Arguments - `data`: An object of class `s2dv_cube`. - `destination`: A character string containing the directory name in which to save the data. NetCDF file for each starting date are saved into the folder tree: 'destination/Dataset/variable/'. By default the function saves the data into the working directory. - `startdates`: A vector of dates that will be used for the filenames when saving the data in multiple files (single_file = FALSE). It must be a vector of the same length as the start date dimension of data. It must be a vector of class `Dates`, `'POSIXct'` or character with lenghts between 1 and 10. If it is NULL, the coordinate corresponding the the start date dimension or the first Date of each time step will be used as the name of the files. It is NULL by default. - `sdate_dim`: A character string indicating the name of the start date dimension. By default, it is set to 'sdate'. It can be NULL if there is no start date dimension. - `ftime_dim`: A character string indicating the name of the forecast time dimension. If 'Dates' are used, it can't be NULL. If there is no forecast time dimension, 'Dates' will be set to NULL and will not be used. By default, it is set to 'time'. - `memb_dim`: A character string indicating the name of the member dimension. It can be NULL if there is no member dimension. By default, it is set to 'member'. - `dat_dim`: A character string indicating the name of dataset dimension. It can be NULL if there is no dataset dimension. By default, it is set to 'dataset'. - `var_dim`: A character string indicating the name of variable dimension. It can be NULL if there is no variable dimension. By default, it is set to 'var'. - `drop_dims`: (optional) A vector of character strings indicating the dimension names of length 1 that need to be dropped in order that they don't appear in the netCDF file. Only is allowed to drop dimensions that are not used in the computation. The dimensions used in the computation are the ones specified in: sdate_dim, ftime_dim, dat_dim, var_dim and memb_dim. It is NULL by default. - `single_file`: A logical value indicating if all object is saved in a single file (TRUE) or in multiple files (FALSE). When it is FALSE, the array is separated for datasets, variable and start date. When there are no specified time dimensions, the data will be saved in a single file by default. The output file name when 'single_file' is TRUE is a character string containing: '__.nc'; when it is FALSE, it is '_.nc'. It is FALSE by default. - `extra_string`: (Optional) A character string to be included as part of the file name, for instance, to identify member or realization. When single_file is TRUE, the 'extra_string' will substitute all the default file name; when single_file is FALSE, the 'extra_string' will be added in the file name as: '__.nc'. It is NULL by default. - `global_attrs`: (Optional) A list with elements containing the global attributes to be saved in the NetCDF. - `units_hours_since`: (Optional) A logical value only available for the case: 'Dates' have forecast time and start date dimension, 'single_file' is TRUE and 'time_bounds' are not used. When it is TRUE, it saves the forecast time with units of 'hours since'; if it is FALSE, the time units will be a number of time steps with its corresponding frequency (e.g. n days, n months or n hours). It is FALSE by default. ## Returns Multiple or single NetCDF files containing the data array. - **`single_file is TRUE`**: All data is saved in a single file located in the specified destination path with the following name (by default): '__.nc'. Multiple variables are saved separately in the same file. The forecast time units are calculated from each start date (if sdate_dim is not NULL) or from the time step. If 'units_hours_since' is TRUE, the forecast time units will be 'hours since '. If 'units_hours_since' is FALSE, the forecast time units are extracted from the frequency of the time steps (hours, days, months); if no frequency is found, the units will be ’hours since’. When the time units are 'hours since' the time ateps are assumed to be equally spaced. - **`single_file is FALSE`**: The data array is subset and stored into multiple files. Each file contains the data subset for each start date, variable and dataset. Files with different variables and datasets are stored in separated directories within the following directory tree: 'destination/Dataset/variable/'. The name of each file will be by default: '_.nc'. The forecast time units are calculated from each start date (if sdate_dim is not NULL) or from the time step. The forecast time units will be 'hours since '. ## Examples ```r data <- lonlat_temp_st$exp CST_SaveExp(data = data, ftime_dim = 'ftime', var_dim = 'var', dat_dim = 'dataset', sdate_dim = 'sdate') ``` ## See Also `Start`, `as.s2dv_cube` and `s2dv_cube` ## Author(s) Perez-Zanon Nuria, nuria.perez@bsc.es

CST_SaveExp function