我编的程序如下turtles-own [energy]+ W3 Q6 e. n; {! U) y p; S5 l
to setup9 H) j D4 T+ j) f+ Y4 D |
clear-all
& ^# _3 q0 S; t+ m: r setup-patches
& V% \1 A4 K! b) n' A create-turtles 100
. q" \. W) I. a3 P8 t do-plots5 c. ?2 X/ D e+ [5 j2 J! ]' ^
ask turtles [ setxy random-xcor random-ycor ]# l5 F( f* x9 {4 v; Z
end
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move-turtles
' s+ b! n, I5 ?5 E5 f: f( O) t! O eat-grass
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check-death. R+ m: \; R6 v+ O
regrow-grass* s$ j8 A5 Y# m
do-plots
3 n! k+ f7 r- @4 wend
5 L8 e O. W& b+ u' \4 z0 [to move-turtles5 L) A0 _( o% L0 V$ `) }8 M' S
ask turtles [4 M4 G/ c6 t& k; L4 v7 z
right random 360
) w4 D3 s8 |. D. I6 L$ n+ k forward 1
4 \( M5 D. |8 L5 O% S set energy energy - 11 A( d2 Y) M$ \8 O
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end$ C) L; y( U, y, i1 O/ ]% i
to setup-patches) P- s* k- p" a. n
ask patches [ set pcolor green ]
; k/ z6 X0 l7 V5 Wend
4 g$ T( S& R: O3 b$ ^* Sto setup-turtles2 |9 H. L o( ^ _
create-turtles 100
0 f3 Q$ B2 }; a+ p5 t ask turtles [ setxy random-xcor random-ycor ]
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to eat-grass
6 E) a( B, j9 B2 _ ask turtles [
1 p1 o& d7 }- Y) y4 T3 R: M if pcolor = green [
, a9 Z) [' H* o Y$ O set pcolor black
9 M" i5 x. A* D2 B set energy (energy + 10)1 ]; ?: J$ \! n
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ifelse show-energy?
d/ Q- J! K3 B7 H [ set label energy ]3 D. C2 W/ w n
[ set label "" ]
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end
2 z. q2 o$ f. r' ]to reproduce
. [- |: V8 }' u! n1 w ask turtles [% z- z7 l6 `' |0 ?6 A2 t/ H3 K/ @
if energy > 50 [: ^' _: Y7 z& z" B( u
set energy energy - 50% g a" P/ m; b4 `: E4 Y; d$ _+ Y. Q0 I
hatch 1 [ set energy 50 ]
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end z& @4 R0 R) n3 O3 @' F1 `
to check-death( ^ H+ X. Q% g% ]/ N
ask turtles [9 v4 p! j0 ~/ ]8 I. Z) P6 Q. t+ g
if energy <= 0 [ die ]8 k/ i8 O# q+ b# R7 {
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end" y' E' U0 e% q% I( }
to regrow-grass! n& J8 C+ ~2 b" g. C. i3 S
ask patches [8 z: q5 C/ U& r1 a# e" h2 f+ T8 Q
if random 100 < 3 [ set pcolor green ]
d4 |" X3 C( J& b2 ^ ]
! v2 S/ U: ~& O2 P; s5 \, a3 Eend
1 k, U( C5 F! }# l1 n+ Oto do-plots2 H. Q/ @5 X' D# g. `
set-current-plot "Totals"4 e1 e f% B @6 [. I l, T
set-current-plot-pen "turtles"1 a% s% x3 v) Z# {' v% H! z9 L
plot count turtles
7 Y: H7 w1 [" l% ~ set-current-plot-pen "grass"
/ P0 R# ]6 C9 h plot count patches with [pcolor = green]) ?) y7 G& x( N: N- k8 {# c+ B
end
8 L e9 }6 I: x可是运行时提示no such plot: "Totals"3 ~" Q' p6 T4 T1 p
error while observer running SET-CURRENT-PLOT
% m) {$ z$ h* k called by procedure DO-PLOTS
* t2 q! B t, ]- L2 { called by procedure SETUP
l6 ]( R5 f. O, o; D' O- I, Z called by 按钮 'setup'
' a) W+ u# @3 r求大神解答啊 |