      \fitem{linearize}(nim, tol:numeric) build a new nim that
      approximates the argument.The new nim uses only linear
      interpolation and homogeneous breakpoints. 
      An adaptive sampling step achieve an approximation within
      \code{tol} (\emph{i.e.} for any point in the domain, the images of
      the nim argument and the nim result are withing \code{tol}.  See
      p.~\pageref{fct:sample} and function \acode{sample} and
      \acode{align_breakpoints}. 

      %%% -------------------------------------------------------

