get_mass_props_and_unc_and_radii: Get mass properties and uncertainties and radii of gyration

In massProps: Calculate Mass Properties and Uncertainties of Tree Structures

Get mass properties and uncertainties and radii of gyration

Description

get_mass_props_and_unc_and_radii() creates a mass properties and uncertainties and radii of gyration list from a selected row in a data frame.

Usage

get_mass_props_and_unc_and_radii(df, id)

Arguments

df	A data frame with (at least) these columns: id, mass, Cx, Cy, Cz, Ixx, Iyy, Izz, Ixy, Ixz, Iyz, POIconv, Ipoint, sigma_mass, sigma_Cx, sigma_Cy, sigma_Cz,sigma_Ixy, sigma_Ixz, sigma_Iyz, kx, ky, kz.
id	The id value of the desired row.

Value

A list with the following named elements:

• mass Numeric mass.

• center_mass Numeric 3-vector center of mass.

• point Logical indicating point mass. The inertia of point masses is excluded from calculations.

• inertia Numeric 3x3 matrix inertia tensor. The signs of the off-diagonal elements of the inertia tensor are determined by POIconv. For example, the xy element of the inertia tensor is Ixy if POIconv is "-"; it is -Ixy if POIconv is "+".

• sigma_mass Numeric mass uncertainty.

• sigma_center_mass Numeric 3-vector center of mass uncertainties.

• sigma_inertia Numeric 3x3 matrix inertia tensor uncertainties.

• radii_gyration Numeric 3-vector radii of gyration.

Examples

mp_table_small_rollup <- rollup_mass_props_and_unc(mp_tree_small, mp_table_small)
radii_table_small <- add_radii_of_gyration(mp_table_small_rollup)
get_mass_props_and_unc_and_radii(radii_table_small, "C.1")

massProps documentation built on April 4, 2025, 1:45 a.m.