CAP 8 Pag.147

[Alessandra Grosso]

Hallo,

I try to insert the function:

>(defun draw-city ()
  (upgraph->png "city" *congestion-city-nodes* *congestion-city-edges*))


but it said the function UPGRAPH->PNG is not defined.

If I insert the function 
UPGRAPH->PNG it will say that another fuction is not defined.

I have even insert the file suggest from this web-site: http://landoflisp.com/source.html

The problem keeps showing. 

Can you please help me?


Thanks a lot

[Alessandra Grosso]

sorry it was a problem at pag  145!!!