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# Wrapper for arithmetics with constants
#
# Wrapper function for basic arithmetic functions with constants (cmsaf.addc,
# cmsaf.divc, cmsaf.mulc, cmsaf.subc). Argument op is one of 1-4, depending on
# the arithmetic function used.
arithc_wrapper <- function(op, var, const, infile, outfile, nc34, overwrite,
verbose, nc = NULL) {
check_variable(var)
check_constant(const)
if (is.null(nc)) check_infile(infile)
check_outfile(outfile)
outfile <- correct_filename(outfile)
check_overwrite(outfile, overwrite)
check_nc_version(nc34)
if (op == 4 && const == 0) {
stop("Division by zero not allowed!")
}
calc_time_start <- Sys.time()
# get information about dimensions and attributes
file_data <- read_file(infile, var, nc = nc)
if (op > 2) {
file_data$variable$prec <- "float"
}
result <- array(file_data$variable$attributes$missing_value,
dim = c(length(file_data$dimension_data$x),
length(file_data$dimension_data$y),
1))
time_bnds <- array(NA, dim = c(2, 1))
vars_data <- list(result = result, time_bounds = time_bnds)
# create netcdf
nc_format <- get_nc_version(nc34)
cmsaf_info <- switch(op,
paste0("cmsafops::cmsaf.addc ", const, " added to ", var),
paste0("cmsafops::cmsaf.subc ", const, " subtracted from ",
var),
paste0("cmsafops::cmsaf.mulc ", var, " multiplied by ",
const),
paste0("cmsafops::cmsaf.divc ", var, " divided by ", const)
)
##### prepare output #####
global_att_list <- names(file_data$global_att)
global_att_list <- global_att_list[toupper(global_att_list) %in% toupper(GLOBAL_ATT_DEFAULT)]
global_attributes <- file_data$global_att[global_att_list]
dims <- define_dims(file_data$grid$is_regular,
file_data$dimension_data$x,
file_data$dimension_data$y,
0,
NB2,
file_data$time_info$units,
with_time_bnds = file_data$time_info$has_time_bnds
)
vars <- define_vars(file_data$variable, dims, nc_format$compression,
with_time_bnds = file_data$time_info$has_time_bnds)
write_output_file(
outfile,
nc_format$force_v4,
vars,
vars_data,
file_data$variable$name,
file_data$grid$vars, file_data$grid$vars_data,
cmsaf_info,
file_data$time_info$calendar,
file_data$variable$attributes,
global_attributes,
with_time_bnds = file_data$time_info$has_time_bnds
)
# calculate results
if (file_data$time_info$has_time_bnds) {
time_bnds <- get_time_bounds_from_file(infile, nc = nc)
}
if(!is.null(nc)) nc_in <- nc
else nc_in <- nc_open(infile)
nc_out <- nc_open(outfile, write = TRUE)
for (i in seq_len(length(file_data$dimension_data$t))) {
dum_dat <- ncvar_get(nc_in, file_data$variable$name, start = c(1, 1, i),
count = c(-1, -1, 1))
dum_dat <- switch(op,
dum_dat + const,
dum_dat - const,
dum_dat * const,
dum_dat / const
)
dum_dat[is.na(dum_dat)] <- file_data$variable$attributes$missing_value
ncvar_put(nc_out, vars[[1]], dum_dat, start = c(1, 1, i),
count = c(-1, -1, 1))
ncvar_put(nc_out, dims$t, file_data$dimension_data$t[i], start = i,
count = 1)
if (file_data$time_info$has_time_bnds) {
ncvar_put(nc_out, vars[[2]], time_bnds[, i], start = c(1, i),
count = c(-1, 1))
}
}
if(is.null(nc)) nc_close(nc_in)
nc_close(nc_out)
calc_time_end <- Sys.time()
if (verbose) message(get_processing_time_string(calc_time_start, calc_time_end))
}
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