我编的程序如下turtles-own [energy]
* j0 C. N! H; t' xto setup( A* k+ u L5 H+ w! [
clear-all
6 [: C7 B! K5 I, b1 k- } setup-patches; c8 q7 w, k: ]/ b% E! i
create-turtles 1008 h1 i" I5 C% N+ t
do-plots
+ B; R# l! g* G* X7 { ask turtles [ setxy random-xcor random-ycor ]
& R" r, q2 w1 p) S8 s. rend# K: l% l5 z& l2 K# d
to go
+ n% i) b/ G! _4 y1 U2 M move-turtles
a' C3 ?- a; A; J9 t* K eat-grass1 H7 ` w9 [& I
reproduce0 [6 a4 P% C1 a( o; b% `8 U9 z9 ?4 j
check-death& x- q! L8 X! b. V
regrow-grass
4 R: v# X) B) B3 U* h do-plots
4 o# F; T! R! F4 send
. W' m" ?# z9 n, f1 Gto move-turtles
& u' J! |8 K) k" U4 |( J; u/ G ask turtles [
4 p6 t& p: U( \3 k" [ ]% D. } right random 360) A. X. [' v; \! `; R( T
forward 1
' o5 f# K8 o& [6 d- x; | set energy energy - 11 G0 Q- q7 G& z( e5 S& a5 Y5 T
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end, Z* _, N. p( u
to setup-patches; }' Z- N: u2 R% O: u/ X1 _& c
ask patches [ set pcolor green ]& t5 g! _! {9 m
end' m8 l$ p& `% h" Y' q
to setup-turtles
0 D; H! J6 h) v4 U create-turtles 100( h% u# s/ z n4 `+ i- S5 |( i
ask turtles [ setxy random-xcor random-ycor ]
4 _/ X1 \( S0 P' Rend; L, n9 `0 u1 \; r3 D" h
to eat-grass
( t* K6 k. D) b ask turtles [/ W9 ]9 W) z# h& r6 f- c+ j
if pcolor = green [
+ O2 h5 k3 P( w& W6 o/ S set pcolor black8 U7 u2 X9 ]: a
set energy (energy + 10)3 }8 a, n- T Q& L# H
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ifelse show-energy?: J- G5 d( i+ C; P: f
[ set label energy ]
" z5 N/ Y& ^# U$ V3 H5 Y, { [ set label "" ]2 J2 e, ^+ I% [ u. A% g+ k
]' n4 ` Z( H+ A1 c
end/ ~0 r- d! k; I/ e7 @ m
to reproduce
% U' }( s1 f4 k( F ask turtles [- V# c$ E' `9 R) L
if energy > 50 [5 `2 |$ W$ m8 m, a- q% | v( }
set energy energy - 500 L" J8 S/ I& Z8 J
hatch 1 [ set energy 50 ]
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end2 O$ z. X8 S9 E, a3 ?( H
to check-death
6 q. [% e: h+ i ask turtles [3 a5 ^, w* b1 y. R2 F
if energy <= 0 [ die ]
2 M! x$ w5 o$ X/ } ]
: n7 U# V% r) P( Q* ]4 u6 |6 send6 n! p4 r: d. K7 z
to regrow-grass
9 g0 q v3 _: }% m* ?) N2 s- W ask patches [
& ^+ F0 K0 S$ m) o if random 100 < 3 [ set pcolor green ]
/ `. Q B6 h/ y9 v3 R; z ]
5 d- k* I4 o$ ?0 mend
: v$ [$ J" u% o9 n8 Jto do-plots
@- S* r, k# K2 Z' ?. c1 N set-current-plot "Totals". Y# g' e1 I1 q
set-current-plot-pen "turtles"* w. N. R3 `/ c L+ S4 L0 j
plot count turtles
0 ]: K- W: x. c' F set-current-plot-pen "grass"
) [. A1 k! K5 Y) Z( h9 {7 A plot count patches with [pcolor = green]
, P1 C2 p( R8 U9 r& F, ^' ^4 Q" Tend
3 N! F" B1 D7 h {可是运行时提示no such plot: "Totals"
/ N4 R, h) T$ zerror while observer running SET-CURRENT-PLOT4 Z+ A) h- M* R; [: t
called by procedure DO-PLOTS6 H6 f9 v0 Z) E
called by procedure SETUP
( h% Z- `! D, z called by 按钮 'setup'
4 f7 K8 d- v$ ^; u$ g- h$ x求大神解答啊 |