You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: getProjOrder.m
    path of file: ./repos/chebfun/@opDiscretization
    
    the code of the file until where you have to start completion: function projOrder = getProjOrder(L)
%GETPROJORDER   Get projection order of a discretization.
%   Each boundary and continuity constraint in a linop forces a reduction in the
%   total number of rows in the discrete operator, so that the composite is
%   square. The reduction is found by down-projection of the result of applying

    
function projOrder = getProjOrder(L)
%GETPROJORDER   Get projection order of a discretization.
%   Each boundary and continuity constraint in a linop forces a reduction in the
%   total number of rows in the discrete operator, so that the composite is
%   square. The reduction is found by down-projection of the result of applying
%   the operator.
%
%   PROJORDER = GETPROJORDER(DISC) returns a matrix of dimensions by which each
%   column of the DISC.SOURCE should be down-projected in order to end