Argument to dynamic structure reference must evaluate to a valid field name.

Error in IMFEATURE (line 172)

outstats=subsasgn(outstats, s, subsref(stats, s));

Answer 1

[Voss]

You can avoid this error by changing this line (line 164):

s(2).subs = {requestedStats{p}};

to this:

s(2).subs = requestedStats{p};

However, you can avoid using subsref/subsasgn (and constructing the necessary substruct) entirely by changing line 172 to:

outstats(k).(requestedStats{p}) = stats(k).(requestedStats{p});