Is defined in Wikipedia http://en.wikipedia.org/wiki/Taxicab_geometry
But I saw it as another way of calculating it for vectors and similar
$d = \mathrm{num}_1 + \mathrm{num}_2 - 2 \times \mathrm{intersect}$
- $d$= distance
- $\mathrm{num}_1$ = number of values in left vector
- $\mathrm{num}_2$ = number of values in right vector
- $\mathrm{intersect}$ = intersection number of overlapping values
Is this right ? and how the equation becomes ?