secto3d 3D surfaces conversion

## Syntax

    [m[,x]]=secto3d(seclist, npas)
                [m]=secto3d(seclist, x)

## Arguments

seclist

  a list whose elements are (2,.) matrices

npas

  an integer

m

  a matrix

x

  a vector

## Description

Considering a surface given through a list `seclist` of sections in the `(x,z)` plane `[m [,x]]=secto3d(seclist [,npas])` returns a matrix `m` which contains a regular discretization of the surface.

- The i-th row of the matrix m corresponds to the i-th section

- The j-th column of m corresponds to the x(j)

Each section `seclist(i)` is described by a (2,.) matrix which gives respectively the x and z coordinates of points.

`[m]=secto3d(seclist ,x)`in that case the x-vector gives the discretization of the x-axis for all the sections

## See also

- plot3d