Hi, First of all, I'm a Maple beginner, so I hope you will be patient with me..;). I have simple problems, you don't worry I have created an expression Zin, function of different variables (a,b,c,d,e,f,omega) and after I have defined a numerical value for all except for two variables (a, omega). I will define a discrete vector for a with input parameters min, max value and step (the sintax in mathcad is very easy: a:= [min,step,..max]) I will plot 2d the family of curve zin, with omega as x axis and a as sweeped discrete parameter thank you in advance