我编的程序如下turtles-own [energy]
( S$ ^3 t5 j$ \+ d' Qto setup. W/ |9 e- {7 O( u/ g" j7 x. {
clear-all9 _& b8 o n* u8 ?5 C
setup-patches
3 o4 O' }" D9 T9 } create-turtles 100( c* Q: `4 o1 W0 N. a* R9 j6 c
do-plots0 }& W5 n" `9 B W7 Z" |1 k
ask turtles [ setxy random-xcor random-ycor ]& V3 o" V4 p' I, D- C- B3 l: d
end
' W C: v) X/ {% J7 Fto go% A8 H/ z, V% _% p, w; d* `- f% }
move-turtles! ^7 B$ |; U" m7 \; i0 w
eat-grass9 `% P5 o( s- M) _. k% x
reproduce
0 P2 X5 ]/ b. s5 E) o$ m check-death* U5 o/ u! n+ s5 s: Z
regrow-grass
" H+ l2 z" {: I! b# Y do-plots
+ Y! @# O' ?. j9 X+ w2 qend
% p {. i; Y$ dto move-turtles; P7 D) a! u3 }' M% U
ask turtles [
! [# ~ P: K; O0 ~2 y8 G right random 360( S! H+ ` C/ b6 {0 o) d. @3 O. J
forward 19 r. M) V% G F* m* u% L0 S( i2 K
set energy energy - 11 ~5 {3 }& S8 f3 F$ j5 k
]
6 ^" ~3 o/ X8 z; p5 Gend
$ @+ @, F, ?: M& v4 p9 oto setup-patches) O' }# g" ]3 j5 [$ X( X
ask patches [ set pcolor green ]
& J$ p* Q) U" M. Xend2 h/ {/ Z8 f% N5 W( q
to setup-turtles! _* E" ?) C' H
create-turtles 1002 |, Y% ^/ _2 v# _0 X% N
ask turtles [ setxy random-xcor random-ycor ]2 s, K, ?5 J2 g. t P1 a
end
" h u2 n- H9 L& ?to eat-grass
. \$ [; S0 X& ~. a# \ ask turtles [0 a; _# H( \4 q
if pcolor = green [
0 D0 j, v: S1 n0 m set pcolor black
: K3 h% Z+ l7 Q ~ set energy (energy + 10)6 f. G9 k% a% b/ d
]2 \* b/ d) Q5 f
ifelse show-energy?& q% {1 I* V# j( F' V
[ set label energy ]
6 ]1 k, `' }! d" e ?/ Q4 b [ set label "" ]9 E/ A# u- W: H
]
, @% Z" K8 e2 \3 b0 ^' }) j4 k$ Lend) U% i) \5 U2 k9 c- q3 [2 r
to reproduce
( N9 ? l2 U. g2 o* O! b4 f7 O ask turtles [: P, C/ X2 K9 s0 \9 ~
if energy > 50 [
4 V; o5 }7 q( l7 [' L6 x1 I: ^ set energy energy - 50
# O7 {! p, d% F6 H hatch 1 [ set energy 50 ]
) _$ \3 G; N8 W$ r C& ?% k3 E ]
5 r& \- q/ K' U2 j8 m, Z! t ]
' U( r* ]( t6 W3 Iend$ g; }; ~/ A& x
to check-death
+ ^* X* z! u* f' s ask turtles [
6 q8 H( o5 O4 q( S if energy <= 0 [ die ]
3 O8 f9 C- l9 D# C ]% _+ k! w1 b% o: ~ g! E
end
F* T( U& |- }) h1 u& g) @to regrow-grass; t. H* R U3 ^$ Q
ask patches [
0 M: J: y# _7 Y6 h& M8 T0 X0 Q6 U if random 100 < 3 [ set pcolor green ]
( N- i q- }' v5 E& I9 c6 j' X) R ]
+ ~% D; e6 B6 jend: t$ }- C1 _* M8 _4 E
to do-plots, J% P v& E. e6 r) {; ~- z
set-current-plot "Totals"
& B% K& l1 R0 g% p: q* q set-current-plot-pen "turtles"
3 Q; C3 w- a1 v! P T plot count turtles
/ T7 d5 @6 D- G6 @+ Q7 q" v set-current-plot-pen "grass"
1 S! p. q0 T- V" W# {( g! d" { plot count patches with [pcolor = green]
" N7 X( e9 z7 D' ?end0 n; l2 ^0 M# ^8 g; W1 N
可是运行时提示no such plot: "Totals"
$ e; r% p& L9 W$ H$ yerror while observer running SET-CURRENT-PLOT. j' @+ }7 y, V! E7 |" Y
called by procedure DO-PLOTS
1 r$ ~# v9 R9 h, z called by procedure SETUP
+ @; o3 r; o5 |3 }% y7 U$ ` called by 按钮 'setup'* d! B7 S+ ?( Q
求大神解答啊 |