我编的程序如下turtles-own [energy]+ U' h+ L1 a& u) r; ?0 }7 M
to setup
/ Y9 R( i) S6 A( D. L# c; N clear-all
8 d8 F. m# ?' y1 \ setup-patches
/ u. \% H6 _- C' b create-turtles 1001 c3 b, i' l' b
do-plots9 F: J; ^) l2 C6 {) ]' u! G' Z S
ask turtles [ setxy random-xcor random-ycor ]) z' X% _8 r C* R8 e
end
$ a; l5 k- [+ ]2 Z) fto go+ S2 i' i J2 o2 T/ r
move-turtles \% H3 D( {9 p
eat-grass; v$ X2 i# j7 b$ B. G
reproduce
; |: |2 e/ }' X& B+ s* P6 m check-death# o" C. `, p7 R
regrow-grass; ?+ i. A/ h6 T" z/ p
do-plots) G* \& x) |( W2 P" g1 z1 }
end
; ~: Y" A( ]! kto move-turtles v) _" K: V3 k% D- d q% w0 }
ask turtles [5 q; V5 t( i+ w
right random 360
, k- J( Q5 C* h& g6 ~ forward 13 K% w2 f; M, K" Z1 @* b5 p
set energy energy - 15 K4 V% R9 ]# D; B
]
8 R! D8 r& S* E* _end
" @; B5 y( `0 V+ {# xto setup-patches
/ ~( b! Z/ z0 n1 e ask patches [ set pcolor green ]$ X A( C$ I$ `6 x/ ^$ n+ S, N8 R" g
end
6 i2 @, c# |' A2 D4 Kto setup-turtles
6 K" H/ E1 D, A- Q! s create-turtles 100$ T* C; `! ~9 V+ o9 b' ^
ask turtles [ setxy random-xcor random-ycor ]& C9 p8 f0 ^- o, \3 u9 i# q* o; T
end
% m+ [; G% z, M6 ~6 {7 r5 g9 ~8 Wto eat-grass0 y! ~- B7 p+ K O% k7 H/ F
ask turtles [
% W: U0 M1 i6 y Y$ p, J o% T if pcolor = green [
4 M, t; V4 A3 I$ Z: _: Z. w* f set pcolor black+ q* M( ?1 i9 g) t0 E6 V5 p3 T. w
set energy (energy + 10)
6 s+ [$ A" R0 c ^. v ]
$ N% ?0 ]6 R; V9 D2 R! t ifelse show-energy?
7 i+ H9 C/ P" Y$ _! n6 i9 K; Y [ set label energy ]. w M/ c8 S. b+ u
[ set label "" ]: S% [# H7 _% {( j" i3 N ?+ ^
]+ k. R% `7 ~& q. Q# e) o
end) U2 ~' p- Q% I+ D$ j' [+ ^
to reproduce5 \ Q! ~1 v( V& N, I6 g/ K- K) E
ask turtles [
5 A1 a' y2 C2 r& s if energy > 50 [. S @2 s) l5 {% n0 Q, E' [
set energy energy - 50& [7 v6 a9 O7 E/ H
hatch 1 [ set energy 50 ]
, W# i5 ~- w4 K7 L: x! i4 c ]/ n+ i8 ^, \5 x6 B9 O9 P5 G
]& a% a- G# d6 b. W
end9 y& ~7 `8 _1 |7 A+ i
to check-death; d+ {. Q9 N! E4 H1 g) Z/ O
ask turtles [( N' M: N: f t* S* D+ W
if energy <= 0 [ die ]7 V0 G+ [1 T) S9 r3 ]$ \6 j8 ^
], n6 R& |3 g+ g2 [, V x& N+ t7 J
end7 C+ `) v2 I$ ^& ^1 L& ~: _
to regrow-grass: N. g) s4 I4 E4 c# V5 s: s
ask patches [( s/ E; Q; F$ @* ]
if random 100 < 3 [ set pcolor green ]
) e4 X0 u( E W) I, J# o9 B6 h ]
; \2 S% z8 a2 q7 d2 I t7 t% Iend5 N9 A# b# ^- u s
to do-plots
, z( q/ n2 O. z t' y( j7 f; i set-current-plot "Totals"
* P# l% G% c; H9 G set-current-plot-pen "turtles"
9 n* L( v3 z$ m% w, K plot count turtles
5 i. E/ V5 g" i" ~7 k5 g set-current-plot-pen "grass"
$ h1 A3 H0 v" g4 _ plot count patches with [pcolor = green]
/ ^1 I1 F ~6 b4 Wend. l4 e# Q7 H E1 a4 `# L" q' V
可是运行时提示no such plot: "Totals"& e2 C2 q2 e) N' E; y5 P# j# z
error while observer running SET-CURRENT-PLOT
6 S) \. r7 V4 |. ] called by procedure DO-PLOTS
% u" C$ d/ ]: e. G# L3 S called by procedure SETUP
2 t; D7 O) f$ ^" Y3 \% U$ D- [( G3 ~ called by 按钮 'setup'! C6 T6 `6 _: a7 Z# i& [
求大神解答啊 |