我编的程序如下turtles-own [energy]* a" R$ `/ z R% ?
to setup" R8 V \. z; B# c5 q" Z/ s
clear-all3 l& O) {) [$ s1 ^3 s
setup-patches
% x/ V5 r) s, ?# |% n create-turtles 100
' _$ h: X1 R2 J8 z$ R b do-plots3 Y* O- L. f5 X: J
ask turtles [ setxy random-xcor random-ycor ] T! K# D z' W, ~. {# k; y
end
( m: e+ C; j) _: o1 q% x7 g; Y% Jto go4 v0 x6 h7 P T/ b
move-turtles* M$ c9 S) t* t/ ]
eat-grass2 J. ~ K: {; |# j+ r) k
reproduce
6 b- d1 m/ n9 s8 X! t% m" g/ ] check-death s' _% y1 a+ s
regrow-grass0 K; y4 ]' G! I* y
do-plots
' d2 \+ V& y' [end
! b( i0 h5 _& s. lto move-turtles
" Y3 E4 f! a- e/ y4 h2 q0 D! ` ask turtles [8 J+ k4 o: W+ e3 j4 T9 `
right random 360
( |9 B. i" ^( i forward 1
+ _, r4 J, V4 i V$ ~. h set energy energy - 1
0 ]3 }. \+ X+ g. n( O ]) u3 m) a U, s* h
end% U3 X7 c; m: |. ^2 U( X X% ?: ]8 Z
to setup-patches
{ X6 n: \5 p ask patches [ set pcolor green ]
( A5 P+ d8 Z7 X: h a4 x# b+ Pend- A' l2 t' }% n2 a
to setup-turtles
" l) x ~& p0 X: K0 e create-turtles 1005 r5 ]: E+ u! n1 D
ask turtles [ setxy random-xcor random-ycor ]
( I* b. \$ f2 F8 n4 _& j, }3 cend
4 E! |' s& y) O8 I Xto eat-grass
% Z1 S) ]; O4 u' A( H ask turtles [
) r) f/ V* }0 h. u1 x if pcolor = green [
- T7 L6 b# Y, B* ] set pcolor black% |' W ?7 q+ R8 N
set energy (energy + 10)! I. k# f! D( Y6 Y" r6 Q7 B
]
h# U5 M' {1 h" x. B ifelse show-energy?
( d0 G- q5 }% |# y5 u0 f2 c [ set label energy ], |9 y# l: m& }& N
[ set label "" ]
" g1 X. N6 k( j7 X( ]' _- j ]$ v2 S, W* ~. j0 N! j7 I
end
2 [( ^- W9 P- H5 d: R: G ^3 pto reproduce) H" B7 t8 @8 V+ U. x0 n
ask turtles [$ f, Z. S! H N: V) ]& q1 V
if energy > 50 [* k! z* l) G$ S# {
set energy energy - 50" J0 H3 i+ e1 O) z
hatch 1 [ set energy 50 ]; I0 _: d; h( J2 z2 n3 [ d
]
7 a& Z% U1 |5 v; U ]8 ~5 R, S3 r3 B) E2 Y% `
end9 V9 A- l8 n% k0 i
to check-death$ u- I) `8 u8 k( y& c
ask turtles [4 ]- |5 q! T* D6 C4 @
if energy <= 0 [ die ]
8 c2 s$ M% K+ S9 h3 B& L) s ]
6 l" l, `4 h/ ~2 N) Fend
# d3 C) c$ A( O; tto regrow-grass
, Y8 N5 Y$ `( T8 h ask patches [
, H3 g _0 L# o1 f& w9 R if random 100 < 3 [ set pcolor green ]
$ H# E" F" }! Q( q# x* w d ]9 _' G" J/ y+ `( U' g
end
! ~0 q" E$ u7 x' K0 E6 dto do-plots& g6 E' D) [& p9 V+ \, m$ ^
set-current-plot "Totals"
( C Y1 R" q, A4 m7 O set-current-plot-pen "turtles"
/ i7 Z4 ?) W6 ] B) R& Y plot count turtles" ^4 }, B5 e- s) l A. o
set-current-plot-pen "grass"
: U5 h) H" F% ]9 K plot count patches with [pcolor = green]. R& s- d* J, K( Q# n9 ?
end
: m, X7 x; G3 }可是运行时提示no such plot: "Totals"% y: _0 f9 i' Y/ ^) `2 C
error while observer running SET-CURRENT-PLOT* Z: x' \1 R. r$ L3 Z! G s
called by procedure DO-PLOTS
% e5 V! e. N& k L. V7 o/ z* Y2 K called by procedure SETUP; b9 }/ q9 l# m
called by 按钮 'setup'- ]" G) P' `+ A2 Y
求大神解答啊 |