Following on from Li-aung's answer, what you probably want is something like
isequal({a,b,c,d}, {'a', '0', '10', '20'})
This will return true
iff a
has the value 'a'
and so on.
EDIT
To perform multiple assignments, you can use DEAL
[a,b,c,d] = deal('a', '0', '10', '20')