我编的程序如下turtles-own [energy]
2 X. ~( R6 o# d9 |6 X) B' Jto setup2 m9 \; B: k, R6 Z" B3 Y& o
clear-all K V- o1 @9 f; x* V3 m9 U
setup-patches) q5 h+ i/ s. Q" z& g/ J5 H9 _: g$ P
create-turtles 100
6 a3 J3 o Q) ? do-plots3 ~, x, k" Z! v8 P
ask turtles [ setxy random-xcor random-ycor ]
( I( u" @4 b( qend
6 R0 `- d% ~5 x8 H8 h* Q. i1 m" h+ qto go* ]1 U& ?* X$ f* h
move-turtles x* h F$ L/ X1 Q
eat-grass: r' `8 V+ c: U! W9 [+ Q
reproduce
6 E# g6 R! f- }$ z& Y! A check-death
3 Y. z: v6 j# B& i regrow-grass
9 b& E) C C! R2 }' d8 P do-plots) b* U2 l" R2 J# \! x: Y! f+ M# |& |, d
end
: b: n8 `) w, {) Yto move-turtles
3 W; g4 d0 w1 m& i8 q9 h2 r ask turtles [) x1 z5 J @5 T" e
right random 360
9 O7 t0 p1 @7 ]7 i P8 I& B forward 1
- O3 X ^; ^% O4 k! f) l set energy energy - 1
5 O8 f) d e6 `& n- z ]
& F; _! ?& S! wend3 t8 Y5 B$ H+ ~+ I# n) o# X3 B* [( `2 i
to setup-patches4 m' |+ \! V0 U; Z/ Y+ O4 w0 w
ask patches [ set pcolor green ]2 c- E8 ~" c' m$ I4 i* D
end6 `' w+ ?) V- q3 q
to setup-turtles
! z; p( J8 x+ G# g2 @2 d create-turtles 100- H- f5 Z) n a, D! I- _
ask turtles [ setxy random-xcor random-ycor ]$ n7 _5 M2 L7 o8 m% d* \
end
4 I1 m7 a7 ?$ P4 ~to eat-grass
% F# f% K" B# d! B ask turtles [# X( y- J3 a- Q9 d/ V' v
if pcolor = green [% e5 b4 i# ?# g1 B7 @8 @- h
set pcolor black
, k" b7 g6 Z$ e2 g- m2 R/ x set energy (energy + 10)
" V1 D6 K. Y7 }# e4 w' j ]1 T; H: V9 p2 {- h- n
ifelse show-energy?! i/ b2 d4 R% F4 S/ h: A
[ set label energy ]
' {9 ^8 \$ Y3 H g [ set label "" ]( h- a6 L# z: [# U/ u
]
. V- w# G5 D5 V6 j1 O1 }end4 X. `! Y# r- H( {7 f% c0 S
to reproduce
& @6 [( B/ |6 H; i2 l. g ask turtles [5 `0 S" | L! q
if energy > 50 [
1 W# {/ y- \/ p1 N9 S" F set energy energy - 50) ^4 t0 |1 J( Z; \5 Y) K
hatch 1 [ set energy 50 ]8 c4 X/ O0 v8 N+ X. `$ P
]
% M: b' t. `2 I! B ]
5 f X0 U" T2 j1 z- }end5 ^' K. k3 _ V9 {# M+ I$ A8 z
to check-death
8 P' ^8 t3 Z( z- f- D! j# t1 H ask turtles [
. }# }0 \( Y n d; j" z2 | if energy <= 0 [ die ], \4 O% T3 d, f( q; K
]8 L# |) w; t& O; P9 P
end
$ r5 o( ^7 q; s4 hto regrow-grass
1 `& X4 G/ e7 d4 L- r6 u* x ask patches [4 z, Z- z% @- j) }; ]8 y7 g Z, }
if random 100 < 3 [ set pcolor green ]
- y# x+ `9 D( C- ~$ y% u ]
7 g/ ]2 u+ m! dend
/ E0 r4 u! ~7 Qto do-plots
3 ?4 K0 v: I \' r. ^- [/ i( a; ~ set-current-plot "Totals"0 x! A0 R* t) I2 ~3 [
set-current-plot-pen "turtles"2 \/ O. \, Y& ^, J$ o2 r0 ^
plot count turtles
1 _& [0 p/ h& R- g set-current-plot-pen "grass"4 {2 V" @, O9 z' P) [, [6 H& K9 S
plot count patches with [pcolor = green]
9 l8 T% O4 G6 C; Q: W( b' q: Y3 fend8 V& e2 l @& ]( W
可是运行时提示no such plot: "Totals"+ ]- k: k* r4 @; N8 f+ d
error while observer running SET-CURRENT-PLOT
9 v. P1 P, O1 M3 P! ` h+ Q called by procedure DO-PLOTS3 z0 q9 C& A% q
called by procedure SETUP
6 v* @0 J# P& g& _# ~) X called by 按钮 'setup'
6 T* m" B) G9 z) I7 f% a2 o" G8 p求大神解答啊 |