Checking whether a field is present in cell.

I've got some variables stored in a cell but not all of the fields are present in every entry of the cell, so I need to check whether a particular field is present before I use the values contained in it. So I've got...

for m=1:NumYears
    for p=1:NumTechnologies
        if exist(TriangularVariables{m,p}.ReconstructedVariables)
            disp('exists')
        end
    end
end

but Matlab returns the error 'Reference to non-existent field 'ReconstructedVariables''. I thought perhaps it was because I was referring to the contents of the cell rather than the name so I also tried round brackets but then Matlab complained that I wasn't referencing properly.

Thanks in advance.

[Natalie]

All sorted now I used...

if isfield(TriangularVariables{m,p}, 'ReconstructedVariables')

instead. Still not exactly clear why the other way didn't work so I would be grateful if somebody could explain. Thanks.