fieldset(s, n, v)
Sets value v for member n in structure s. If s is not a structure, then s becomes a structure and its previous value is lost.
See also fieldnames fieldremove fieldvalues
Example
a = 2
2
fieldset(a, "count", 234)
234
a
count : 234
fieldset(a, "year", 1998)
1998
a
count : 234
year : 1998