Get mass properties and uncertainties for a row in a data frame

get_mass_props_and_unc() is a convenience wrapper that combines the results of get_mass_props() and get_mass_props_unc().

Usage

get_mass_props_and_unc(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.
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.

Examples

get_mass_props_and_unc(mp_table, "C.1.2.2.3.1.2.3")
#> $mass
#> [1] 0.1213345
#> 
#> $center_mass
#>        x        y        z 
#> 70.54848 81.54389 44.52262 
#> 
#> $inertia
#>              x             y            z
#> x  0.143256682 -0.0123144484 0.0012773920
#> y -0.012314448  0.1458692409 0.0003485651
#> z  0.001277392  0.0003485651 0.1309228273
#> 
#> $point
#> [1] FALSE
#> 
#> $sigma_mass
#> [1] 0.2892205
#> 
#> $sigma_center_mass
#>        x        y        z 
#> 28.83321 29.16371 29.59459 
#> 
#> $sigma_inertia
#>            x          y          z
#> x 0.37222944 0.02191471 0.02146982
#> y 0.02191471 0.36942277 0.02242524
#> z 0.02146982 0.02242524 0.37416478
#>