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# Wrapper for number of timesteps depending on threshold
#
# Wrapper function for counting the number of timesteps depending on a threshold
# (num_above, num_below, num_equal). Argument op is one of 1-3, depending on
# the function used.
num_wrapper <- function(op, var, thld, infile, outfile, nc34, overwrite,
verbose, nc = NULL) {
check_variable(var)
check_constant(thld)
if (is.null(nc)) check_infile(infile)
check_outfile(outfile)
outfile <- correct_filename(outfile)
check_overwrite(outfile, overwrite)
check_nc_version(nc34)
calc_time_start <- Sys.time()
##### extract data from file #####
file_data <- read_file(infile, var, nc = nc)
time_bnds <- get_time_bounds_1(
file_data$dimension_data$t
)
# calculate results
if (!is.null(nc)) nc_in <- nc
else nc_in <- nc_open(infile)
# initialize array with zeros
result <- array(0, dim = c(length(file_data$dimension_data$x),
length(file_data$dimension_data$y)))
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 >= thld,
dum_dat <= thld,
dum_dat == thld
)
dum_dat[is.na(dum_dat)] <- 0
result <- result + dum_dat
}
if (is.null(nc)) nc_close(nc_in)
vars_data <- list(result = result, time_bounds = time_bnds)
nc_format <- get_nc_version(nc34)
file_data$variable$prec <- "short"
cmsaf_info <- switch(op,
paste0("cmsafops::num_above for variable ", var),
paste0("cmsafops::num_below for variable ", var),
paste0("cmsafops::num_equal for variable ", var)
)
time_data <- time_bnds[1, ]
##### 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,
time_data,
NB2,
file_data$time_info$units)
vars <- define_vars(file_data$variable, dims, nc_format$compression)
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
)
calc_time_end <- Sys.time()
if (verbose) message(get_processing_time_string(calc_time_start, calc_time_end))
}
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