read_fit: Decode a FIT file

In fitdc: Garmin FIT File Decoder

Description

Decode a FIT file

Usage

read_fit(file_path)

Arguments

file_path

string; path to the FIT file to be read.

Value

decoded data messages from the FIT file.

Examples

## An example of generating a table of record messages
## from the file provided with this package:

fp <- system.file("extdata/example.fit", package = "fitdc")
data_mesgs <- read_fit(fp)

## Filter out the record messages:

is_record <- function(mesg) mesg$name == "record"
records <- Filter(is_record, data_mesgs)

format_record <- function(record) {
  out <- record$fields
  names(out) <- paste(names(out), record$units, sep = ".")
  out
}

records <- lapply(records, format_record)

## Some records have missing fields:

colnames_full <- names(records[[which.max(lengths(records))]])
empty <- setNames(
  as.list(rep(NA, length(colnames_full))),
  colnames_full)

merge_lists <- function(ls_part, ls_full) {
  extra <- setdiff(names(ls_full), names(ls_part))
  append(ls_part, ls_full[extra])[names(ls_full)]  # order as well
}

records <- lapply(records, merge_lists, empty)
records <- data.frame(
  do.call(rbind, records))

head(records)  # voila

Example output

  timestamp.s position_lat.semicircles position_long.semicircles distance.m
1   833043008                629554507                 -14635683       6.62
2   833043009                629554202                 -14636770      13.39
3   833043010                629553899                 -14637884       20.3
4   833043011                629553615                 -14639020      27.25
5   833043012                629553299                 -14640152       34.3
6   833043013                629552919                 -14641216      41.28
  accumulated_power.watts altitude.m speed.m.s power.watts heart_rate.bpm
1                     267       45.2     6.511         267            114
2                     467       45.2     6.754         200            115
3                     692       45.2      6.83         225            116
4                     931       45.2     6.902         239            116
5                    1168       45.4      7.03         237            117
6                    1421       45.4     6.961         253            117
  cadence.rpm temperature.C left_torque_effectiveness.percent
1          69            15                              91.5
2          70            15                              91.5
3          70            15                                78
4          72            15                                78
5          72            15                              81.5
6          71            15                              81.5
  right_torque_effectiveness.percent left_pedal_smoothness.percent
1                                  0                          25.5
2                                  0                          25.5
3                                  0                            22
4                                  0                            22
5                                  0                          22.5
6                                  0                          22.5
  right_pedal_smoothness.percent
1                              0
2                              0
3                              0
4                              0
5                              0
6                              0

fitdc documentation built on May 2, 2019, 6:04 a.m.