Screen to detect impossible values in vectors of u ratios.
screen_u(u_vec, art_name = "u ratio")
Vector of u ratios.
Optional artifact name to use in warning messages.
Does not return values; stops processes if improper values are used.
# NOT RUN {
## Not run
## screen_u(u_vec = c(0, .8), art_name = "ux")
## screen_u(u_vec = c(-1, .8), art_name = "ux")
## screen_u(u_vec = c(Inf, .8), art_name = "ux")
# }
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