original post: http://en.smath.info/forum/yaf_postst8053_Vectorize---works-differently-in-6179.aspx
In forum's first attachment, h:20*vectorize(log10(g*eval(vectorize(abs(vectorize(H(f))))))) shows several issues, depending on how is defined the user-function H(s)
- "argument must be scalar" error if line is used in H(s);
- a scalar output if no line is used;