我编的程序如下turtles-own [energy]9 B5 [9 M& n$ @3 d& w/ g+ R
to setup
: J7 K# p' V$ @% L% |% l clear-all) j, n4 f% V2 z% O; S
setup-patches
7 @! ] J1 b$ R create-turtles 100
- ?* U1 e& |" h' `: j do-plots
3 M2 z0 V7 \2 T- O ask turtles [ setxy random-xcor random-ycor ]2 q4 U7 r- C2 b3 U. C9 u0 R
end
& P, z( a8 H, `" Eto go! p# O" o: [/ H
move-turtles7 F+ o. n$ O" \
eat-grass
; _/ ~ ]0 v( s5 u) I* M reproduce
' d0 Z8 }. r4 j& f7 ? b check-death# D7 a$ H* z0 E8 B/ G! U
regrow-grass4 ?0 b! C' T% z1 J. n2 {5 P7 C
do-plots
" H4 H$ V; {5 }end
1 y! e, r. O0 w3 \8 ~' Q# t' V$ Gto move-turtles) W' ?3 `' j- B* M3 M- e
ask turtles [
( B% Z* T, s. | q+ C' n5 O right random 360" g; R3 q% P! i6 m
forward 1
M9 Z t, C% Q set energy energy - 1
1 R9 v" }* e1 U/ x; x* K+ r1 o* z ]( m8 `' c' G/ X9 y6 N5 x
end; g. Q, K5 ^/ ~
to setup-patches" H2 O' x' M/ d5 h$ i2 J
ask patches [ set pcolor green ]& H4 N+ b6 e& {! h5 ?$ ?
end, q C. p# i2 c* c9 S
to setup-turtles& _$ @- g% q7 o$ _6 c6 l
create-turtles 100( F9 U; P, f# Y% n4 @& V
ask turtles [ setxy random-xcor random-ycor ]7 c; S- q" v; z' p7 |* B
end
3 i R# ^$ P) m4 X Q! uto eat-grass8 M4 ^, W2 o3 b) U- K* h
ask turtles [7 o3 D+ s8 e" G6 A
if pcolor = green [
0 O3 Y2 A7 K5 q& {* ?- G0 q N set pcolor black
# ]% s/ A; V8 ?2 X- J9 E set energy (energy + 10); r: X! _6 W; V+ s
]; y+ I4 X% g" x: @$ p, T$ e7 p
ifelse show-energy?
" C* b q4 s1 Y% t3 f [ set label energy ]
7 H5 i6 `+ z8 s2 I0 ?6 ]3 ~3 W [ set label "" ]
, `- H0 \- e' m" U7 B0 X ]
0 G4 W5 B" U6 y I: i. @end
+ ]9 H/ V, w$ p( q% Uto reproduce3 C* U% `6 O9 q. ?1 |2 H" X5 g
ask turtles [
9 \- g! {, v9 K" T3 r7 H if energy > 50 [3 Z: J) O9 X, h2 X7 }9 g' l
set energy energy - 501 P! G5 n. a3 o* F0 E- {8 m; z( J( W
hatch 1 [ set energy 50 ]
8 V6 L, e+ @' U+ V- E ]
0 z! n9 }4 Z" p5 b4 M* H ]
7 l% L% `+ x) D9 Q9 mend: m0 J3 [6 P7 Z& d0 J4 o, j2 ~
to check-death- J' A- D u' K% _
ask turtles [3 L, M2 y- {: |0 J0 W5 U7 m. c/ _
if energy <= 0 [ die ]4 \. e* p/ L* a4 |' u0 N$ I; E4 W
]
+ N( I3 f. A: D2 k# L/ C& C* _6 bend, k. c% {3 c# }" i0 ]$ Z
to regrow-grass
6 S1 c! \* c7 K% e& A$ O9 m4 g7 W ask patches [& y" T I. Y% r( f: m
if random 100 < 3 [ set pcolor green ]( }8 [; S* O" F6 d+ I9 L% I) Q6 C
]) R5 p; \3 ^# c2 {2 w/ C( l
end$ _" L" Z3 W2 j; [ i, Y( ]7 C
to do-plots7 B$ F# \6 O7 T9 z& Y# V
set-current-plot "Totals"$ ^0 Q: J! F, k: r0 O! W& L; N
set-current-plot-pen "turtles"8 X% B4 K. F5 j4 }5 Y5 X3 e. C' l
plot count turtles
% c4 y$ s8 X2 X5 x6 C set-current-plot-pen "grass"- r( `% [- _6 S$ V2 u
plot count patches with [pcolor = green]# l' S/ p3 W5 U: F2 z. I% a
end
4 @4 C! n. E: a# y5 Q* D; r7 W可是运行时提示no such plot: "Totals"
2 J# H# v) w4 A3 e2 Q3 Z, J9 {error while observer running SET-CURRENT-PLOT
! a! p% T) `& A: L$ T1 x% [ called by procedure DO-PLOTS
, `, e+ f& i7 G. b0 j called by procedure SETUP' _/ a Q+ n4 H- L! n
called by 按钮 'setup'
0 }9 X1 d, D& P求大神解答啊 |