retrieve the geomaterials whose birifrigence are lower density than the given value.

: Queries the list of geomaterials that have lower birifrigence than lt.

Usage

geomaterials_bi_less_than(lt, ...)

Arguments

lt

float value.Birifrigence is calculated from refractive index as (rimax-rimin).Range: bi_min - bi_max.

...,

Further named parameters.Other optional arguments.

Value

df, a data frame of geomaterials

Details

This function releated to the field "bi_max" of geomaterials. retrieve all the geomaterials that has higher birifrigence than the given value(lt).

Examples

if (FALSE) {
df <-geomaterials_bi_less_than(0.3)
}