我编的程序如下turtles-own [energy]
D' g/ z# J4 }2 K; Ato setup' z5 J$ I4 K x2 ~7 |# l. r6 K8 [
clear-all
& g# m1 d4 A. B5 q setup-patches
8 z8 }6 n! Z2 M8 R/ d5 k1 v create-turtles 100
* ]3 h, Z* |% Z! B do-plots
6 R$ {) v$ g) U4 A ask turtles [ setxy random-xcor random-ycor ]9 U$ z [* W- t7 `' D: k8 h
end9 }0 m; o4 g$ P) B8 _& j! c$ e
to go
0 T1 r) E, C$ z move-turtles
6 [1 p# y7 T" p' O" q" ~ eat-grass
' C! q, F5 L* N: |; V4 c reproduce) m+ ` P @5 V6 k3 O7 F. y3 D
check-death" C5 B' `4 H# y& S
regrow-grass) l* n7 b; J0 U2 ?$ a
do-plots
$ R- K3 h, ^+ B7 K; qend( x+ R/ x, ^$ Q$ l; w. m( k
to move-turtles6 B; [1 z' q3 [0 v
ask turtles [
3 H# T [; @( f right random 360
$ W6 F3 \* O! K9 g forward 10 F( m; Z# q$ }. `% F
set energy energy - 1
5 D' s/ [4 p6 d( }; t ]1 Y* E" f7 q& W6 m& u! R
end1 `2 ?! c4 s8 p. m4 F/ _% I6 o
to setup-patches
: R: W) m. q1 o. J0 L ask patches [ set pcolor green ]; q! ^6 U* M( L) `$ j! d! I
end
9 `; L0 d/ }0 Sto setup-turtles8 e" I5 ~' V. |
create-turtles 100
4 u, v# g- H. e2 _/ d! l! u% l ask turtles [ setxy random-xcor random-ycor ]
; D- j) {2 r( E0 Fend: u) A9 x1 q% Y* N) |: g. ]
to eat-grass
1 S* V5 W9 w" {2 S2 Q ask turtles [
0 B" B9 u9 Z1 Y if pcolor = green [# c& G& k7 C# c& p% F, ]
set pcolor black
( f/ E' h6 |' @! i6 _2 Q set energy (energy + 10)
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ifelse show-energy?* ~; n1 Z! Y: M6 o) t1 D
[ set label energy ]* X4 ? o: c3 v7 \4 a# y9 ?3 }
[ set label "" ]
: U# r0 g' y# W ]0 o3 t& F/ l5 o) G b! X8 P
end
m$ ]; \3 J N5 \; \( U) q* Y$ sto reproduce
5 U$ K' Q o" E. k( ~5 r/ A( x ask turtles [
+ _, h3 T ^! x U: U1 w if energy > 50 [
" U5 N# e6 G# \, g6 V# N set energy energy - 501 J# q4 y" a# j3 E' r( Y2 F
hatch 1 [ set energy 50 ], @0 G: i7 E: k, q9 T; _- c, w
]
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end
' w n- V8 v5 K" h! H) ]% W. i6 L* Lto check-death
( g {1 {1 V \8 q. L) D% H ask turtles [
0 j n7 y8 S- ^+ T5 z) |6 f if energy <= 0 [ die ]8 o! W& H0 V+ A5 h3 F5 F Y
]
: P8 Z2 w8 L3 Y/ C% _end
4 X% [: @5 |* mto regrow-grass: }* _4 g3 p5 U }1 l9 R1 _7 S( D; \
ask patches [
' f+ W# k2 w! ?8 m if random 100 < 3 [ set pcolor green ]
' O- W2 _! b9 Q* U% P7 T# w( `) Y ], Z& H1 I% [, }' y, t! d) w$ D
end0 ^3 D9 w# ~' I. m; Y8 ^& H" U
to do-plots- E* Z2 N; v4 ?3 D# ^
set-current-plot "Totals"
8 G7 t* a7 @1 Y& Z8 U1 c set-current-plot-pen "turtles"
0 ~. `; c' Q- C, K% C O5 L+ m plot count turtles
$ s& o& n% ~. O8 i2 G2 l set-current-plot-pen "grass"
6 Q5 a+ T1 g" a+ }$ J; G& Z* o plot count patches with [pcolor = green]
0 R$ a) J* z- U1 x& u ^5 uend* v9 C. L' e3 P, [
可是运行时提示no such plot: "Totals", {; i* ^) J8 K
error while observer running SET-CURRENT-PLOT4 e# {3 R* q4 O1 x
called by procedure DO-PLOTS+ Q( F' G ]5 }7 `$ p, A Q' Y
called by procedure SETUP4 X) t r2 p9 A. x- \
called by 按钮 'setup'5 R, K0 e- _( j
求大神解答啊 |