function k = elementIndex(a,name)
% ELEMENTINDEX -  The element index of the element with name
% 'name'.
%
%   The index is an integer assigned to each element in sequence as it
%   is read in from the input file.
%
%   If name is a single string, the return value will be a integer
%   containing the corresponding index. If it is an cell array of
%   strings, the output will be an array of the same shape
%   containing the indices.
%
%   NOTE: In keeping with the conventions used by Matlab, this method
%   returns 1 for the first element. In contrast, the corresponding
%   method elementIndex in the Cantera C++ and Python interfaces
%   returns 0 for the first element, 1 for the second one, etc.
%
%      ic = elementIndex(gas, 'C');
%      ih = elementIndex(gas, 'H');
%

if iscell(name)
    [m, n] = size(name);
    k = zeros(m,n);
    for i = 1:m
        for j = 1:n
            k(i,j) = phase_get(a.tp_id,13,name{i,j});
        end
    end
else
    k = phase_get(a.tp_id,13,name);
end