logging a function's argument

[parisse]

That's because the commands you are calling are doing some preprocessing, in order to avoid evaluating parameters again and again.
If you quote the function as argument of e.g. romberg or gaussquad, you will see the values.

Code:


argx(a):=begin l.append(a); return a; end;
l:=[];
romberg('sin(cos(argx(x)))',x,-1,1);