Error message

[Kay McCullough <mccullou@netspace.net.au>]

Could someone please help me with this one. I have defined a turtle
variable called STRENGTH and I am trying to build a simulation of a pond
ecosystem in which the strength of the turtles dictates their survival in
various ways.

I keep getting an error message:
" value STRENGTH is not of the expected type REAL.."

when I try to execute my procedures and I don't understand what starlogo is
trying to tell me.

My procedures reset the value of strength depending on food available, to
strength - 2 and strength + 2. Strength is initially set as a random number
between 0 and 100.


Thanks in advance for any suggestions,

regards,

Kay McCullough