===== Primitive: Convolution with set of skeleton points =====

**Definition**: <m>sum{}{}{f(r)}</m>\\
<m>f(r)= 1/(1 + S^2*r^2)^2</m>, Cauchy kernel [McCormack and Sherstyuk 1998]
\\
r - distance to a skeleton point

**Call**: hfConvPoint(x,vect,S,T);

**Parameters**:

x - point coordinates

vect - array of skeleton points' coordinates

S - array of kernel width control parameters for each point

T - threshold

**Test file**: [[http://hyperfun.org/convpoint.hf|convpoint.hf]]