Description Usage Arguments Value Details See Also

View source: R/point_3d_variance.R

Calculates sample variance of points' distances in 3D space from their centroid. This function is normally only used indirectly through 'validate_get_twcv'.

1 | ```
point_3d_variance(point_matrix)
``` |

`point_matrix` |
An n-by-3 numerical matrix where each row corresponds to a single point in 3D space. |

A one-element numeric vector holding calculated variance

The variance here is taken to mean the sum of variances for each dimension/axis:

*
sum_(i=1)^n ((x - x_m)^2 + (y - y_m)^2 + (z - z_m)^2) / (n - 1)
*

Where *X/Y/Z* represent one axis each, *a_m* represents the mean
of all points' coordinates on an axis, and *n* represents the total
number of points.

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