baytrends (version 1.2.1)

qw.import: qw.import

Description

Import the contents of tab delimited text files to a QW object.

Usage

qw.import(fn.import, qw.names, rounding = c(3, 4))

Arguments

fn.import

Filename (with path) containing data. Comma separated (CSV) format only.

qw.names

Names of parameters for QW columns.

rounding

OPTIONAL. Rounding values for QW columns. Default is c(3,4) but can be changed.

Value

Returns a QW enabled data frame.

Details

This internal function will import data from a comma delimited (CSV) file to create a data frame with columns of the qw class.

Only three slots are recognized by this function; ".Data" and "remark.codes" The slot name ".Data" includes ".Data.values" and ".Data.value2".

These three slots are marked as "_lo", "_hi", and "_symbol" in the import file the prefix of the parameter name to be used in the qw object; e.g., secchi_lo, secchi_hi, and secchi_symbol.

To view all qw slot names use the command slotNames("qw").

The function returns a data frame with QW enabled columns. The user must save the file. Any modification of column classes needs to be handled by the user (e.g., character to date or POSIXct).

Examples

# NOT RUN {
# Use internal function to export dataCensored as example for import
qw.export(dataCensored, getwd(), "data_censored_test.csv")


# Import Test file as a qw object

# Define function parameters
fn.import <- file.path(".", "data_censored_test.csv")
qw.names <- c("secchi", "chla", "do", "tn", "tp", "po4", "tdp"
              , "no23", "nh4", "tdn", "tss")
rounding <- c(3, 4)

# Import
dataCensored.test<- qw.import(fn.import, qw.names, rounding)

# Check for qw class
str(dataCensored.test)

# Save
save(dataCensored.test, file="data_censored_test.rda")


# Show slot names for a qw object.
slotNames("qw")

####
# convert date field to POSIXct
#dataCensored.test[,"date"] <- as.POSIXct(dataCensored.test[,"date"])
# str(dataCensored.test)
# as.numeric() and as.integer() can be used to convert columns of those types.
# }