我编的程序如下turtles-own [energy]$ s8 p4 T& A6 r6 D9 i+ d2 r
to setup* r& `% A/ ], Q ~8 `8 L
clear-all1 Z, `, X2 |6 x/ O% ^
setup-patches2 B& y, P, F) `1 f- c* W6 E* ~
create-turtles 100
z; u& P; a# S do-plots8 |) S) p# h* F
ask turtles [ setxy random-xcor random-ycor ]
) L$ s8 G! e# j; J, W# }8 q1 c- Send
& w9 R3 D: f) Vto go M6 l5 Q7 n/ E1 a8 \
move-turtles% k3 X/ E; i9 Y3 K8 R' @
eat-grass
7 C9 G; R, F" ~* w; L' V$ r reproduce
1 u, w- N& x! e' m* _* m6 b* w check-death! e. r5 A& c9 j/ W5 {; l' z8 f4 p5 K
regrow-grass
+ I* f! H, Y0 p5 C) B6 c5 p9 | do-plots. Q9 p) R! A* x
end* p+ ]2 P* K: \0 X* h
to move-turtles4 f, K; }6 a% D# V
ask turtles [
, v( j2 n( @& ]7 {% b. R) x1 @ right random 360) w3 o# M6 |# c+ m' k, Z
forward 1
0 t* u! M: W' c0 B; T- J/ | set energy energy - 1
F# |! D' \ v- n4 s+ Z: O7 ~ ]
7 V0 I3 j- A8 _" R0 p5 `- uend$ Y. _. H# @+ B9 N' t. B! S8 ^% w. u
to setup-patches
( r4 g% Y) f+ t ask patches [ set pcolor green ]$ v. a2 Z# {( \4 ^0 n9 W
end, x6 p& N+ C6 v! z: c
to setup-turtles
6 h. N1 T q' ^" l create-turtles 100, z2 _4 o5 c- K% Y3 U" Y1 b) ] ?
ask turtles [ setxy random-xcor random-ycor ]: A" K( l9 @- R9 I0 j) `# h
end6 S3 R: k" G# V! c. Z4 S. V- n: M
to eat-grass: f% |5 q: G& X; K; k3 Z5 ?
ask turtles [
: W9 f+ a$ s* a4 O$ e3 L if pcolor = green [3 \! t5 f8 B& D
set pcolor black
7 i$ d( U& L6 k set energy (energy + 10)
! g6 O w3 z$ G0 a! Z8 I9 K6 ]) d! _ ]
" f; v! F L0 Y6 H" _ ifelse show-energy?
: {2 B& Z3 Z2 ]) } [ set label energy ]
! \ H4 b: a! R' H6 N" \# T [ set label "" ]' G: ~5 R0 Y+ U: U8 G5 k
]. X- O- A: q( K3 B
end
3 g# T. |3 W2 q2 E1 ~to reproduce
, E- P" r2 s0 s' F4 D+ S0 O ask turtles [2 U) F4 f/ v9 B& T
if energy > 50 [. E4 R0 I. z% p
set energy energy - 50
9 Y9 A( f$ |% C8 q& U- m u hatch 1 [ set energy 50 ]
& q, `, N' Q2 k- P7 A ]
) h. E; @$ f: d% P! ? ]
2 e o7 j G1 _, @' xend
! x2 v4 t4 T! O# `" j8 B6 Uto check-death
& h9 T& e2 t$ K6 u, L. O ask turtles [
3 l' w0 x+ r6 R4 t if energy <= 0 [ die ]; P2 e+ n; N' r3 M! |
]
: H: S. b7 e2 ], F8 ? aend1 U0 D" S* S7 _$ @5 I! |. C1 C
to regrow-grass
+ r0 T' {# j& z+ f. D ask patches [
# {8 O* Z0 z% ?7 O3 ] if random 100 < 3 [ set pcolor green ]6 L* x6 G: t$ k6 K2 o
]& D1 }. \0 l$ ?' c9 Y4 K7 r
end7 c* M1 v u R
to do-plots
2 a( G3 Q* L9 g: h- h% K set-current-plot "Totals"
1 [5 d9 y% | w( A, J set-current-plot-pen "turtles"
: N l8 d: [3 m3 V2 c8 M plot count turtles
( c) Q9 _; q4 w0 Y, \" {* { set-current-plot-pen "grass"& j# G' p. Q* { r0 b$ W" N4 ?. P
plot count patches with [pcolor = green]
: w$ Y% _4 T: m) v5 E% Pend
* x; _7 u/ T5 a" Y% s" W, w可是运行时提示no such plot: "Totals"0 X* C4 K% b2 D# z# U
error while observer running SET-CURRENT-PLOT
* z5 |2 ]3 b* b2 U/ W+ v called by procedure DO-PLOTS! } u9 @5 R8 w* |, P5 A
called by procedure SETUP
2 l7 E# C$ J1 K called by 按钮 'setup'
- ?- o3 i0 O" W求大神解答啊 |