On Aug 25, 2008, at 3:44 AM, mehdi kamali wrote: > (map (lambda(x) > (map (lambda(y) > (set! geometry (make cylinder (center x y 0) (material mat) > (radius > r) (height infinity)))) > (arith-sequence -4 1 10))) > (arith-sequence 5 -1 10))
This won't work. The geometry is supposed to be a list of objects. You are setting it to a single object over and over. You need to use a command to append your new object to the existing geometry list, e.g. (set! geometry (append geometry (list (make cylinder .........)))) "append" is a standard Scheme function to append two lists. (Note that the second argument must also be a list, not a single object!) Unfortunately, this is one of the drawbacks of using a dynamically typed language like Scheme -- it doesn't immediately detect when you use the wrong type for something, and only gives you a cryptic error later on when you try to use that variable in a place that is expecting a different type. Steven _______________________________________________ meep-discuss mailing list [email protected] http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss
