我编的程序如下turtles-own [energy]1 m- C" L0 ~$ B
to setup0 j6 e: s8 D4 s
clear-all
/ p6 e. ]/ \& h! x. i! Q setup-patches6 S0 J* Z7 G/ o1 b4 ]
create-turtles 100
" S3 |" y9 ?! ?; c do-plots
) ~- H/ R* D- e8 x( r4 ^$ E6 Z4 ~ ask turtles [ setxy random-xcor random-ycor ]
7 E! Y- y' o1 B! h1 @" }3 S v& {end
6 n2 L) i- ]3 ~( M- `! O& Lto go
7 ]. Z. T: N8 e move-turtles
4 W* I: g5 L( K1 w; a2 V eat-grass- y6 k4 V; Z$ H; B: A% x' _2 I
reproduce1 P h. F7 M; f+ S1 F
check-death9 s+ m+ o6 g9 A7 D8 F& C' f+ C
regrow-grass. W/ }( y% n. e/ [8 Q. S
do-plots
' F4 L) T6 y6 k0 V* Z* zend
+ X, V0 w2 P- c# ?8 |to move-turtles. } }+ d4 z; y0 A$ j2 }
ask turtles [; V& Y4 B( \ J2 B
right random 360
7 ~0 s: o: Y; `6 _ forward 1" p3 p$ @" f/ ?4 X( Z* e
set energy energy - 1
7 U8 C3 u0 Y) {3 E1 O2 R ]
: U$ Y2 ~) D7 V) Z* F% Tend$ N+ @8 i o' s% D6 G2 d7 c% z5 o
to setup-patches* Q9 U+ V# b$ O! a9 ^
ask patches [ set pcolor green ]: {1 h! ?( e( e# C4 l7 K$ B
end
3 {* {- d' _5 J* \- m; [; G sto setup-turtles! `# H9 w" j/ N/ |$ l% K
create-turtles 100
9 x, \! f/ ^! d a3 c. @1 U ask turtles [ setxy random-xcor random-ycor ]
7 ^ X2 q' C3 o1 U* Tend6 G1 d9 S& G- Y5 Y( z
to eat-grass
6 J$ Q3 O& }0 K ask turtles [
9 \) K3 Z9 t0 n: |3 _! U if pcolor = green [9 |- G) D; }" ]
set pcolor black
, _$ h2 ?/ K1 h. D& _, Y. a( \ set energy (energy + 10). N: W! `% u+ Z& _( L
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ifelse show-energy?) [3 K) e: v; R; { I1 {! W+ S
[ set label energy ]6 F* _* Q) A* Z
[ set label "" ]
X) [7 X% o' c8 R1 i* Q9 i' R# E ]- w5 z* R1 ~ g( o7 _, A
end
9 W0 z- j, ^/ G: ~1 u- I a2 P# Ato reproduce
& H5 x2 o3 e, H8 N6 D; c- g! z ask turtles [
$ w4 H5 m% ~6 V1 O8 @$ N& s9 c if energy > 50 [
' `8 Z h& A$ W set energy energy - 50
) [$ U- y6 p/ f$ q( a hatch 1 [ set energy 50 ]4 _. {0 v c) H0 T; F7 W/ l3 Y
]
2 r/ N$ M+ n9 e6 n' O. W ]6 d' F" Q9 A% J u, K& o4 M& m: v
end
5 j0 j/ }7 D+ xto check-death. O* E- p' }0 G5 W/ D
ask turtles [
6 [+ s/ Z% I: A3 f, N( T Q if energy <= 0 [ die ]
/ C$ e" z% P& K& I8 Y; F" F. w ]
) L, i' g$ k* Yend5 t6 D3 E, K- V7 i, O
to regrow-grass
& n8 @$ w N# L4 ^6 i ask patches [
* G3 j; q; Q' C) [/ F0 P. j if random 100 < 3 [ set pcolor green ]$ J. k" D$ ?+ F+ }* J" o. B
]
3 |, z6 v2 }& `! [6 {: c! u+ `end
- h# U @+ N* Q! c& v# N5 yto do-plots& h5 p+ L+ i/ H( i1 @& o, g0 F3 n/ |* l
set-current-plot "Totals"
4 h& }; e# ~8 ~0 d( y2 C; B& t set-current-plot-pen "turtles"" w3 J4 a4 ^3 z( D! ^4 z* j& s$ `
plot count turtles! B: J$ _. [, i5 ] L% {
set-current-plot-pen "grass"6 C8 K7 ~/ I4 W }' @
plot count patches with [pcolor = green]) q3 a2 q9 Z5 U; J
end0 ]. R4 p- C4 v! `) R( @
可是运行时提示no such plot: "Totals"2 W U+ l* a% d Z" M
error while observer running SET-CURRENT-PLOT7 f$ X& K9 G7 {0 ~: `, q
called by procedure DO-PLOTS
5 r3 P/ _) ?* V |0 f) ] called by procedure SETUP
" i6 X, a; C" A2 N+ i$ ^7 ` called by 按钮 'setup'
+ I" E: T2 Q( s求大神解答啊 |