@Mac Dude Thank you for your help. I would like to specify that I need the actual values of two arrays, so when I type 

a := -1 .. 0.1*cos(x), x = 0 .. 2*Pi 

and then 

a

I want to get something actual like

-1, -0.99, ...,  0.1 

the same with x and then I can nterpret it and to contourplot with values along isolines in different package (once again sorry I cannot do it in Maple)