R: Examples for 'vroom::vroom

### ** Examples

fwf_sample <- vroom_example("fwf-sample.txt")
cat(readLines(fwf_sample))

John Smith          WA        418-Y11-4111 Mary Hartford       CA        319-Z19-4341 Evan Nolan          IL        219-532-c301

# You can specify column positions in several ways:
# 1. Guess based on position of empty columns
vroom_fwf(fwf_sample, fwf_empty(fwf_sample, col_names = c("first", "last", "state", "ssn")))

Rows: 3 Columns: 4
── Column specification ────────────────────────────────────────────────────────

chr (4): first, last, state, ssn

ℹ Use `spec()` to retrieve the full column specification for this data.
ℹ Specify the column types or set `show_col_types = FALSE` to quiet this message.

# A tibble: 3 × 4
  first last     state ssn         
  <chr> <chr>    <chr> <chr>       
1 John  Smith    WA    418-Y11-4111
2 Mary  Hartford CA    319-Z19-4341
3 Evan  Nolan    IL    219-532-c301

# 2. A vector of field widths
vroom_fwf(fwf_sample, fwf_widths(c(20, 10, 12), c("name", "state", "ssn")))

Rows: 3 Columns: 3
── Column specification ────────────────────────────────────────────────────────

chr (3): name, state, ssn

ℹ Use `spec()` to retrieve the full column specification for this data.
ℹ Specify the column types or set `show_col_types = FALSE` to quiet this message.

# A tibble: 3 × 3
  name          state ssn         
  <chr>         <chr> <chr>       
1 John Smith    WA    418-Y11-4111
2 Mary Hartford CA    319-Z19-4341
3 Evan Nolan    IL    219-532-c301

# 3. Paired vectors of start and end positions
vroom_fwf(fwf_sample, fwf_positions(c(1, 30), c(20, 42), c("name", "ssn")))

Rows: 3 Columns: 2
── Column specification ────────────────────────────────────────────────────────

chr (2): name, ssn

ℹ Use `spec()` to retrieve the full column specification for this data.
ℹ Specify the column types or set `show_col_types = FALSE` to quiet this message.

# A tibble: 3 × 2
  name          ssn         
  <chr>         <chr>       
1 John Smith    418-Y11-4111
2 Mary Hartford 319-Z19-4341
3 Evan Nolan    219-532-c301

# 4. Named arguments with start and end positions
vroom_fwf(fwf_sample, fwf_cols(name = c(1, 20), ssn = c(30, 42)))

Rows: 3 Columns: 2
── Column specification ────────────────────────────────────────────────────────

chr (2): name, ssn

ℹ Use `spec()` to retrieve the full column specification for this data.
ℹ Specify the column types or set `show_col_types = FALSE` to quiet this message.

# A tibble: 3 × 2
  name          ssn         
  <chr>         <chr>       
1 John Smith    418-Y11-4111
2 Mary Hartford 319-Z19-4341
3 Evan Nolan    219-532-c301

# 5. Named arguments with column widths
vroom_fwf(fwf_sample, fwf_cols(name = 20, state = 10, ssn = 12))

Rows: 3 Columns: 3
── Column specification ────────────────────────────────────────────────────────

chr (3): name, state, ssn

ℹ Use `spec()` to retrieve the full column specification for this data.
ℹ Specify the column types or set `show_col_types = FALSE` to quiet this message.

# A tibble: 3 × 3
  name          state ssn         
  <chr>         <chr> <chr>       
1 John Smith    WA    418-Y11-4111
2 Mary Hartford CA    319-Z19-4341
3 Evan Nolan    IL    219-532-c301

Examples for 'vroom::vroom_fwf'

Read a fixed width file into a tibble