.. index::
   single: G7 Command; lint
   single: Interpolation

Linear Interpolation of Vectors and Matrices
============================================

Linear interpolation of missing values in a vector is performed by the *lint* command.

**lint <names>**
   *lint* replaces zeros and missing values in the time series of the vector or matrix elements with linearly interpolated values.  Zeroes before the first or after the last observation are not replaced.  This command applies only to series in the Vam file.  Groups may be used in the names field to refer to sectors of the currently loaded vector.  

   Example::

      lint pce1

   This example loads the pce vector and then fills in the missing values in sector 1 by linear interpolation.  We similarly could fill in the values for all the sectors in the current dynamic group by ::

      load pce
      lint :

   or all the values for the static group Ag by ::

      load pce
      lint :Ag

   Entire matrices may be interpolated with one command.  For example, ::

      lint am

   will interpolate the entire am matrix.  This interpolation also works for packed matrices.

   The *lint* command works on the entire range of the Vam file without regard to *fdates*.