我编的程序如下turtles-own [energy]
, A2 R) j5 H9 o9 pto setup
$ G5 j5 U* i# L, G- A$ J, m clear-all% F9 ?" E' M5 ? p9 N1 o
setup-patches/ }3 X) m' {2 y1 _/ E- R+ n
create-turtles 100
7 o9 m9 `' n# j8 w do-plots
8 c; f! F! w2 t+ M+ x% L ask turtles [ setxy random-xcor random-ycor ]2 ~' M1 I& Z& W9 P) w" o
end
6 d1 A# w; G4 Z. c8 O8 q* A' R+ @to go$ @6 E: s, M$ G4 }
move-turtles
4 y0 I S; ?( `) ~) f eat-grass
8 Q: @; H n- v x2 y1 [) v* v reproduce4 D3 d3 E/ K9 y& H
check-death
8 ~! `) l& |% e. ?. T regrow-grass# E: {4 [$ F; B u
do-plots
; F* y& T, ?. @8 Jend
( e6 b. N6 i# H7 b0 yto move-turtles
' o' i7 o* J) \! T% ]4 I ask turtles [
8 M, j, k! N( d" J right random 360
, j% |! M( [& Q: Y2 f6 { forward 1# Q( R) W' Z, Q8 X/ ]: b+ ^" V
set energy energy - 1
4 l% l' z! P0 [4 H ]8 L8 K( m( S# B, D
end ]4 n' U& M' A/ S C8 [9 i5 X
to setup-patches0 }+ U3 }( d7 U6 F$ f, y2 i4 H( T
ask patches [ set pcolor green ]
: V i) z" j; @; p% ?" s5 z0 U% Aend! {: f9 {6 l5 w
to setup-turtles2 ?& g! I. R1 I4 N, O( t
create-turtles 1009 x; e& D; L0 }) h
ask turtles [ setxy random-xcor random-ycor ]5 u' K) n2 ~$ }# d) n k9 g. h
end& X* B& s0 \6 {% v, r' P
to eat-grass) m. ?& p$ p, [) h3 K7 |* P
ask turtles [' D0 [1 A6 \' {- R/ s
if pcolor = green [
$ J \5 T! s0 Q" c set pcolor black. X7 {8 B4 ]3 P
set energy (energy + 10)8 f8 J. r% U1 X: i, a/ [/ E8 f
]/ f/ x V% E) v" {9 V* m" F
ifelse show-energy?
* `, ?- Q0 {9 ^ [ set label energy ]7 a8 Q& X( c) [& |5 \2 {
[ set label "" ]
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end1 A3 y# X1 M4 I* G8 i
to reproduce; s; B1 s4 F, o
ask turtles [
/ i7 Y+ b$ \3 V! r if energy > 50 [
- n9 A% i9 t- P; ~ set energy energy - 50
. U& ~$ M, Z* L+ y hatch 1 [ set energy 50 ]
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]
4 L- p W% H( i6 T; C+ K) }2 zend
5 I2 c2 [/ S- f6 B3 jto check-death- `( S+ n0 C1 o& w# j) {
ask turtles [* a" T$ u1 A5 O# v( t+ w" r4 _/ ~
if energy <= 0 [ die ]* o/ O) a" Z+ J% l% _7 V7 E3 l. P o
]
$ S' D$ ^* h# s- Z( Dend! t# D0 i- J& d
to regrow-grass% O5 S6 n& ?4 r, J& }+ U
ask patches [
0 }7 ] |( ~+ ~ if random 100 < 3 [ set pcolor green ]
6 Q9 z/ f L9 Q' {5 r6 @, Q1 i ] K# t3 K) h# B- s5 H
end
5 l% g; m5 T+ x8 X' B/ T6 _to do-plots
4 n' I; y- x) a! N$ O- q/ {4 I7 d! B set-current-plot "Totals"5 d1 Z" V/ w- L0 B% X; r
set-current-plot-pen "turtles"7 f4 a) j5 }- z0 Y3 s" M7 N
plot count turtles
% F/ ]( t$ E Q) ?: Y8 j* g& Z+ i$ i set-current-plot-pen "grass"
# f" u2 @% g5 l, G& `7 F plot count patches with [pcolor = green]
/ ]) @& o0 c: ?7 E, M: P* z, vend
0 j1 m" h: A) j& R- i# {- E可是运行时提示no such plot: "Totals"
{# c+ e& Y+ A8 `. G& n0 w" Perror while observer running SET-CURRENT-PLOT
" k1 V: p. Y- Z& M called by procedure DO-PLOTS
& U- ^; P; W5 W9 O' d6 e. X called by procedure SETUP; V; p3 f) X+ b0 m
called by 按钮 'setup'4 K7 p6 b# F. o) O0 ]. j* B
求大神解答啊 |