Integrates the maximum likelihood estimator of multivariate data over an appropriate subspace to
  produce axis-aligned marginals for use in plot.LogConcDEAD.
interpmarglcd(lcd, marg=1, gridlen=100)
Vector of values at which the marginal density is estimate is computed.
Vector of values of the integrated maximum likelihood
  estimator at the locations xo
Output from mlelcd (of class "LogConcDEAD")
An (integer) scalar indicating which margin is required
An (integer) scalar indicating the size of the grid
Madeleine Cule
Robert Gramacy
Richard Samworth
Given a multivariate log-concave maximum likelihood
    estimator in the form of an object of class "LogConcDEAD" and
    a margin marg, this function will compute the marginal
    density estimate \(\hat{f}_{n, \textrm{\tiny{marg}}}\).
    The estimate is evaluated at gridlen equally spaced points in
    the range where the density estimate is nonzero. These points are
    given in the vector xo.
\(\hat{f}_{n, \textrm{\tiny{marg}}}\) is evaluated by
    integrating the log-concave maximum likelihood estimator
    \(\hat{f}_n\) over the other components.  The marginal
    density is zero outside the range of xo.
For examples, see mlelcd.
dmarglcd, mlelcd