use switch or if..end, e.g.:
function funmain(..., p1)
function funs1()
...
end
function funs2()
...
end
... % 1 or 2 variant
end
% 1 variant
switch p1
case case_expr1
... = funs1();
case case_expr2
... = funs2();
end
% 2 variant
if p1 == expr (or strcmp(p1,expr)...)
... = funs1();
else
... = funs1();
end
