Working with structures

I have a n-by-1 structure array s with fields p and q. Each field contains a different number of elements, but fields of same index have the same number of elements. Specifically, numel(s.p{i})=numel(s.q{i}).

I would like to calculate two things. First, a 1-by-max(numel(s.p{i})) vector with the column means of s.p. Second, a vector of same size with the column means of s.q, but considering nonexistent elements as zero. For example, suppose s.p and s.q are: s.p = [32 35; 36 37 39] and s.q = [100 150; 120 170 180].

I would like to obtain: mean(s.p) = (34 36 39) and mean(s.q) = (110 160 90).

Any help? Thanks in advance.

[Oleg Komarov]

@Michel: correct the typo noted by per isakson.

Answer 1

[per isakson]

???

    >> s.p = [32 35; 36 37 39] 
    Error using vertcat
    CAT arguments dimensions are not consistent.