Signatures will usually be of different lengths. In a comparison, the length of the shorter signature represents the potential length for a match.

extract_feature_length(aligned)

Arguments

aligned data frame with variable x (for location) and two or more measurements (the bullets entry in the list returned from sig_align)

Value

integer value of the length of the shorter signature.

Other alignment-related-features: extract_feature_D, extract_feature_ccf, extract_feature_lag_mm, extract_feature_lag, extract_feature_length_mm, extract_feature_overlap, extract_features_all

Examples

# NOT RUN {
library(bulletxtrctr)
library(x3ptools)

example_data <- bullet_pipeline(
location = list(
Bullet1 = c(hamby252demo$bullet1[2]), Bullet2 = c(hamby252demo$bullet2[4])
),
x3p_clean = function(x) x %>%
x3p_scale_unit(scale_by=10^6) %>%
rotate_x3p(angle = -90) %>%
y_flip_x3p()
)

alignment <- sig_align(example_data$sigs[[1]]$sig,
example_data$sigs[[2]]$sig)

extract_feature_length(alignment\$lands)
# }