stances,
\(W\) be a diagonal matrix of weights from <code>additive</code>, \(r = D / range\),
and \(I\) be
an identity matrix. Then parametric forms for flow-connected
elements of \(R(zu)\) are given below:</p><ul><li><p>linear: \((1 - r) * (r &lt;= 1) * W\)</p></li>
<li><p>spherical: \((1 - 1.5r + 0.5r^3) * (r &lt;= 1) * W\)</p></li>
<li><p>exponential: \(exp(-r) * W\)</p></li>
<li><p>mariah: \(log(90r + 1) / 90r * (D &gt; 0) + 1 * (D = 0) * W\)</p></li>
<li><p>epa: \((D - range)^2 * F * (r &lt;= 1) * W / 