我编的程序如下turtles-own [energy]
% T$ |' Q4 M. }to setup$ s2 Y! A; K8 l8 M+ K
clear-all
7 X0 F3 P+ Q& j) g6 c setup-patches
8 p7 O: J/ S0 H& m. Q" ~/ G create-turtles 100( w% i- M$ d# ]4 C4 a8 M0 S
do-plots
2 {6 v) `5 A$ u ask turtles [ setxy random-xcor random-ycor ]5 Y6 V; Q! F- q, E) m* k0 _
end
: J- |9 q. m( F- \- |0 }% C2 cto go F% {( g# A2 b' m
move-turtles
& [- G" j2 s g9 y, `6 a eat-grass
, F/ o3 V- T- }# z$ _ [5 N reproduce* [1 f o$ L2 x0 k5 C( G, y# |- P, _* C
check-death3 b; v# f6 ~* q# g) T$ Z
regrow-grass2 B' L# M$ U5 K i F6 K) |
do-plots
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to move-turtles
0 S* B) ^) b# r0 f/ Z$ G ask turtles [2 Q$ w& o0 K; n3 R2 O8 k" w+ J# A: O' V
right random 360
) n* n) y5 J: m/ ~ forward 1
. {' T- _# @: i set energy energy - 1
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end. L b8 _" g9 L
to setup-patches
5 W1 K! `3 `; r; B2 E ask patches [ set pcolor green ]
1 O) x0 f2 y2 J3 { `$ r) Cend
2 T! o6 _2 L. ]2 uto setup-turtles
1 j/ |; t3 M& ^- ?, `! Q create-turtles 100
$ H( K3 Z, `# q; S- m( t ask turtles [ setxy random-xcor random-ycor ]
( i3 o( Y p h [, T3 p, z# Nend6 Y* m* C) A' t4 F+ e* u( s! X, f
to eat-grass0 H4 B5 l7 t9 f
ask turtles [
$ h4 u' H6 S' Z& `% |3 n if pcolor = green [) G$ H; l" ?& I% a; j
set pcolor black
4 W4 g% f Y, P4 m5 @# V- T set energy (energy + 10)
; H6 w! I, p6 C. a0 q- A& I4 M ]: v1 W4 {+ u( Z& V% r5 Y
ifelse show-energy?3 ]: S- f$ T( [2 g
[ set label energy ]
q1 }+ x7 S0 I) Q0 b [ set label "" ]$ J B- a9 f4 f: ?5 K) S r
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end
/ k+ @9 N, n4 k, _9 s+ M7 f3 ]to reproduce
3 z/ \4 H4 M" { L6 C ask turtles [' B: j+ \! U U' J
if energy > 50 [% D- m7 l+ R. V& L9 M# ~
set energy energy - 50" @3 \8 T0 w1 @: g% C# @3 q
hatch 1 [ set energy 50 ]
$ p3 M1 s* k3 R i* q. `# o ]
6 c& F, H: ?* U. T; z% } ]
1 r9 }! Z, v; b; Y1 j; g4 cend- {2 @9 W# g x0 b$ c. H+ R1 Z2 c
to check-death& f% ]- k* w3 a! o) H! ~; F
ask turtles [
6 d; Y3 B0 v$ P1 y# S% { if energy <= 0 [ die ]
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end2 s8 B. Y# v+ Q0 ?
to regrow-grass8 L/ r7 A" t" K: p+ F
ask patches [' c+ Q2 b8 ~: n, z# D3 y
if random 100 < 3 [ set pcolor green ]1 n" m) K# c' ~2 Y& p0 \
]) [0 e4 A( {2 L! I
end" B+ E* ? B8 R8 P' {6 l6 A* [* M
to do-plots. s0 P0 _0 Y" D" q
set-current-plot "Totals"
) K @; v) w; v( P set-current-plot-pen "turtles"$ V6 R$ i# w% N3 V& a1 i
plot count turtles
1 m. I' M' o8 I7 x5 [ set-current-plot-pen "grass", U/ J6 w. ]2 x* R# d7 s* r9 A
plot count patches with [pcolor = green]
) ?1 u4 s; g7 F, @$ H0 Send
' Y; C' c/ D' o可是运行时提示no such plot: "Totals"
4 y: ~2 M7 m5 werror while observer running SET-CURRENT-PLOT
4 Y6 H, L8 |) q) |' [- | called by procedure DO-PLOTS
9 J) Z3 j% e2 |6 y8 R* @, `0 M* _ called by procedure SETUP
$ i6 L1 @' I$ \7 |7 @8 b# r. p6 w7 g called by 按钮 'setup'1 l; k2 G$ G$ Y1 a& A8 H& \
求大神解答啊 |