Get length and width

Calculate length and width based on inertia axes (PCA alignment).

Usage

get_lw(x, ..., .cols = NULL)

Arguments

x

A matrix (nx2), list of matrices, or tibble with coo columns.

...

Additional arguments (reserved for future use).

.cols

Column name(s) to process when x is a tibble. If NULL, automatically detects columns containing coo objects.

Value

• If x is a single matrix: returns a numeric vector c(length, width)

• If x is a list: returns a list of numeric vectors

• If x is a tibble: returns a list of numeric vectors extracted from coo column

Details

Length is defined as the range along the major inertia axis (largest variance). Width is defined as the range along the minor inertia axis (smallest variance). Shape is first centered and aligned using SVD before computing ranges.

Note: Returns a vector, not a scalar, so cannot be used with measure(). Use get_length(), get_width(), or get_elongation() for scalar measurements.

See also

get_length(), get_width(), get_elongation()

Examples

get_lw(shapes$cat)
#>   length    width 
#> 229.9564 111.1204 
get_lw(shapes)
#> $cat
#>   length    width 
#> 229.9564 111.1204 
#> 
#> $dog
#>   length    width 
#> 258.8037 162.4473 
#> 
#> $heart
#>   length    width 
#> 207.0122 178.9135 
#> 
#> $leaf2
#>   length    width 
#> 206.1788 172.7478 
#>