我编的程序如下turtles-own [energy]5 _4 y% g; n8 ]8 Y8 r, s0 s$ O
to setup. d% z$ @) P5 \/ }
clear-all
+ d, t0 L- @2 _$ V* s! o6 X) F3 m setup-patches
( r# l/ F' E: S* U3 i create-turtles 100% P; x* m8 R5 D/ r
do-plots
& S# M3 P+ F' ~6 k5 d; K ask turtles [ setxy random-xcor random-ycor ]1 M) x$ t1 O P8 q
end
: ^9 @3 V7 P- C, c! s6 k" I- N7 Y8 yto go
0 m" Y+ z+ A/ ? move-turtles6 v. K6 [' v( B: E. r6 O9 G9 P! [
eat-grass7 Q- d. B0 w1 t5 t
reproduce( h- M. g |7 L$ ^4 Z w. E
check-death
8 N4 b4 \7 m8 K regrow-grass, Y$ b) a+ u. S% j
do-plots" X. C$ c4 e: T+ D2 b* x
end
( X2 ] \; {3 N1 X6 `to move-turtles* z/ ?) V% x" s2 J, [0 R
ask turtles [6 u4 ~' N# c% q/ d$ x
right random 360
" A8 _+ l" k$ O& r4 C forward 1
8 ?* P) K+ b9 C) `/ y; p set energy energy - 1- I( ?8 D4 r2 _/ H+ v2 S
]9 P6 d8 c# J3 g0 m
end
( ^: e0 W6 h: u3 {8 x; s- h4 Tto setup-patches" @1 G" x! w: q/ A
ask patches [ set pcolor green ]2 Z9 I; j z! K. ~
end
: ?- @% [2 C E/ tto setup-turtles
9 w. U* K7 \0 T; C: u create-turtles 100
2 ?9 M. m% g* M4 k8 \ ask turtles [ setxy random-xcor random-ycor ]
/ h: \* J% h5 V' Y8 send
G1 G V; j Y% p# m8 ^to eat-grass r) W# \' w; _6 W- o
ask turtles [
% s R: o9 l7 i Q i9 J1 O3 K: g if pcolor = green [
) W' @: W$ | X- S, K/ {7 i+ _ set pcolor black
5 K2 K2 W4 T# | set energy (energy + 10) l0 v& K2 t# W! E
]
+ H& Q7 V3 M8 N, @/ M+ g2 M ifelse show-energy?0 O6 v# _' N1 A' V# u' K
[ set label energy ]
9 z, h4 N8 G9 O: Y" ~ [ set label "" ]4 {5 S, W4 L& g
]. }) o- b- U7 ~7 p! z
end f& o; \7 O; k+ _4 l* H q
to reproduce. q$ p$ M$ E9 Z8 x) B' p2 l* J& D
ask turtles [
% s# Z) i! \+ G if energy > 50 [
% r$ n3 ?' ^* R( j0 b8 r# K6 Y set energy energy - 500 C. [: A4 U) w
hatch 1 [ set energy 50 ]
3 H5 Q; h1 W- ~6 p! T ]
* H& F7 @5 e" z" f2 \. W ]1 A4 u% H. r" `6 S9 m
end. |, f& j- f/ J8 n
to check-death
" C0 Y. R) \. N) [4 p1 J: r" n ask turtles [( B6 A P; d) s+ H' ~$ _
if energy <= 0 [ die ]
& U8 q! ~* C/ c ]" [- y% Y: `$ [/ A
end
8 N; e5 _ b, N2 H* b, e2 M: jto regrow-grass
) v: y9 k# d$ I$ ` ask patches [8 ?/ u6 ^" s$ g& s3 G( ]( M
if random 100 < 3 [ set pcolor green ]$ U+ w3 H3 E/ {5 @
]
& R! @/ Z* ]; W C, X( zend1 a9 H3 ]) S& {3 V
to do-plots
7 |( M4 A; W L" m set-current-plot "Totals"0 C1 l) |8 U4 v& q& K
set-current-plot-pen "turtles"6 Z! K8 q- v- ~* f. E
plot count turtles' H! Z! d9 m' C9 s. G; g2 L
set-current-plot-pen "grass"
2 b( r# u9 ]' G0 ?, B( s; ~/ j- f: L plot count patches with [pcolor = green]: m" M. s: K7 P- p+ H
end0 Y: `$ |4 H" k- k0 f6 f
可是运行时提示no such plot: "Totals"- Y, F% U4 o6 t( F! m3 G
error while observer running SET-CURRENT-PLOT. s7 T4 P" r9 D' o/ k
called by procedure DO-PLOTS# D3 d. A7 M* a3 `- ]# L9 e( q
called by procedure SETUP/ ~1 b k+ G0 X* {
called by 按钮 'setup'
7 h( A$ `8 ^6 @8 n! O6 E1 r1 L4 v% H求大神解答啊 |