我编的程序如下turtles-own [energy]4 F- L, o" N/ H ~
to setup
* l7 f) A' _0 M4 H4 s! p clear-all( ?* k- }; b- {; G7 h
setup-patches0 T: w6 _' k3 L; r$ g
create-turtles 100
& ^( T) _- A2 d5 V do-plots" Y! t, j. [! R$ P2 L
ask turtles [ setxy random-xcor random-ycor ]1 c- g2 d3 {4 o4 q0 A; R
end% V+ ^: K' H. q: d$ Z* ]# y% @
to go
& K0 q6 `9 Q* d) t, y7 o move-turtles, G8 M% ?8 |1 C& Y0 N9 a- V ~
eat-grass, N* k5 r8 u: k$ L* j/ r
reproduce
% i. s1 k. a" }; Q& x5 ^2 v* t check-death/ N4 w/ @' o* g6 _. ^8 u+ [
regrow-grass7 i% C' l5 o( R
do-plots
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to move-turtles" _1 F' k+ j4 n5 [( E
ask turtles [
3 M; l2 ^$ b& E! L right random 360
9 @" n1 A$ {! P! d, A7 y forward 1
* v$ J) t0 c, R( Y' ?3 n8 { set energy energy - 1
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end
; |1 E, G V( Mto setup-patches; \* q) b+ }1 E4 q# @$ y
ask patches [ set pcolor green ]. e# U' n% @: ?, f7 A
end
( R$ L& w; R, J/ I" W% Hto setup-turtles
) F% `; ]/ a2 e6 b2 n+ i: A0 F create-turtles 1009 s* {- p( D% U
ask turtles [ setxy random-xcor random-ycor ]
5 W6 b7 t5 i2 h d% u+ |end
. Q1 t. T) J2 n! r% Z5 a. ~, Tto eat-grass, x# _+ C9 ~1 w
ask turtles [5 \% P/ P3 h# _3 e0 f* u8 S, r! m' R
if pcolor = green [
* p0 @; z/ \% m. W set pcolor black
5 {* O$ |4 [) H& e# n set energy (energy + 10)' [8 v- J( U( F* k( Y
]
4 R# A! o1 z# R6 Z ifelse show-energy?
0 t, r# ~! B& q5 q+ d7 f [ set label energy ]
4 \) x* [0 f W$ N9 t" D/ H. M [ set label "" ]. F! U; k4 y" h$ E
]
' S" J, i" Q% L% v9 mend0 t( A& w3 ~7 c5 D% _5 J- t
to reproduce
( X/ w- ?' A! T; v! ` ask turtles [8 w0 O- ~1 |" W. r' W/ r
if energy > 50 [! E; z: \9 M' i: E1 V
set energy energy - 50) g+ ~' x; [* f. T1 W5 {
hatch 1 [ set energy 50 ]0 d: ?: A4 r5 n7 {5 B& J
]
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end
8 n6 ~5 X5 b5 |( ^to check-death2 W& @! ], ^. ^$ _( q
ask turtles [
! M( H; w d4 O' r, x8 U: L if energy <= 0 [ die ]
& S4 V' D, l& `' i ]
+ N( B" t/ x4 Wend
3 C/ F* Z( a! d6 {2 q) {1 zto regrow-grass
# u2 s( q; D0 E9 h3 L* G ask patches [
% p7 C0 t! s; ^$ u6 k if random 100 < 3 [ set pcolor green ]
, W( n, C9 B! T$ b) k, g9 H3 J, ] ]
8 r* ^; t! _5 E9 c6 uend( e6 T! p+ ]# B3 I, x/ r% N
to do-plots
/ M) j' L- n0 Y! x8 }8 [# X* x set-current-plot "Totals"
. H' Y; A2 J9 U8 m4 N' N$ m set-current-plot-pen "turtles"
6 ]. h5 o& t& Y( i plot count turtles( L- e( b9 K* }: E. J
set-current-plot-pen "grass"4 I- w* V6 }% y/ u5 H* @) @
plot count patches with [pcolor = green]
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可是运行时提示no such plot: "Totals"% f& c( H1 ]7 T3 N) d% b7 N
error while observer running SET-CURRENT-PLOT9 s, J& J. N& g( [, g2 E
called by procedure DO-PLOTS6 X0 f% Z: h( D3 p* i
called by procedure SETUP6 N7 s& h# H5 r D4 l f
called by 按钮 'setup'" r& \1 }6 l" q) \
求大神解答啊 |