我编的程序如下turtles-own [energy]. H0 `; Q3 F3 U
to setup5 v6 W0 |8 z; s! x' R2 v
clear-all
4 \/ ^# w4 @- \0 f/ b2 f setup-patches* C& T+ M+ o3 G3 I- F% p
create-turtles 100
% v0 R }0 U) L2 p4 g6 X. m- A do-plots
+ c6 `1 P, I* m ask turtles [ setxy random-xcor random-ycor ]: C7 C# i( L4 S* Y* i. i5 C& f
end9 J. {3 s7 F; k- [- X
to go$ W) H" e! x5 A+ q3 P! `! y1 p5 R
move-turtles
6 H. k }# N6 i4 T# N$ n eat-grass* m2 ]! \8 {. R N1 r9 ]
reproduce
4 F1 T. N2 d% t" r& V! w check-death7 S' t7 P, L% D2 C$ C/ n- I
regrow-grass
" d* t- u5 t0 j8 w do-plots
4 n5 ?2 c y8 Xend
, |, p+ K( Q! V6 |to move-turtles7 q+ t( _$ U7 k% G
ask turtles [$ C2 N. N% {7 `( k, {, j
right random 360
, d3 v9 [$ P" y" R forward 1
9 F! W& ?. l; Q' O) f" j set energy energy - 14 }# l# v) w2 a& Z) T
]3 \# \* e+ U. X+ z5 S. L1 Z# k
end
1 s5 Z$ A9 w% ?, ]& h, ~" lto setup-patches3 C; ^/ T9 I& g B0 g: q
ask patches [ set pcolor green ]
7 [ H. L h ~! i. `2 mend* E3 R6 t9 w' [" }& `
to setup-turtles3 i, D! i+ {0 p1 J
create-turtles 100( Y- L+ P4 T+ T0 T' M
ask turtles [ setxy random-xcor random-ycor ]
: Q% o1 u- y6 g, {end
+ r5 e8 o# s2 v4 q) R) Ito eat-grass+ `9 H3 v1 P5 U4 n: b
ask turtles [6 Z2 W+ g2 T( k* x
if pcolor = green [
1 Y# H+ \; p3 G5 ]4 q8 j9 L set pcolor black
' ]. ?2 J, o1 l" t1 S8 | set energy (energy + 10)
8 a# w# G, n' ?: s# z7 m ]7 i6 B: O# h z* ~7 w8 S
ifelse show-energy?4 v2 V4 k( B9 T' J. a
[ set label energy ]
/ l5 i+ }% `7 R# j U9 Y [ set label "" ]& q( ^! C7 j$ d; A
]
5 h! h0 ?* b. r* L9 o" s: x4 h2 p3 ~end0 ^" e6 i/ ]! l h
to reproduce
4 _3 y' p+ b, S& H ask turtles [2 n3 h9 t* U5 v/ i
if energy > 50 [: g: P& k8 D: l1 _! z9 _
set energy energy - 50
5 f- b* y& ?8 k" ?# \$ _6 P2 g hatch 1 [ set energy 50 ]) R# a. {4 h+ o( N0 f; }' K
]
( W0 i) Q4 M; h' g( _! r8 G! w ]7 s2 n" E0 c4 i) R) u
end
6 r" \7 Z c+ ^1 Y( Q* R) L9 Eto check-death
: ?6 s3 c4 P) C3 k- } Z$ o+ u7 f ask turtles [
1 E& ^) j0 v# X5 \/ }& u if energy <= 0 [ die ]; b8 c- L4 T( p
]* q% y& C5 P0 P$ F+ q( ~9 G
end* Y% B1 i2 j% r: e
to regrow-grass
; |/ i/ b3 n3 Q. H, I9 M$ ` A0 y ask patches [7 r$ V5 P1 w- j5 J
if random 100 < 3 [ set pcolor green ]5 n% ^( Y4 K3 l9 P
]
0 k/ B% r$ h$ Rend0 n8 }4 }; j5 y8 I' j
to do-plots
2 O( P5 ?7 y4 n' g% Y( Q5 a' B set-current-plot "Totals"
, u7 g' C+ i3 ^( ^3 O set-current-plot-pen "turtles"6 v$ R* j/ }- R+ U" e' K4 \
plot count turtles
% w: U# Z+ y: k set-current-plot-pen "grass"
4 T' y2 e5 J9 S/ H* p% c, @ plot count patches with [pcolor = green]
! N- G$ g0 F/ ?end" Y' M- P% u2 F* M
可是运行时提示no such plot: "Totals"/ L R* Y6 ~. g- f5 t
error while observer running SET-CURRENT-PLOT# f& R1 m5 @# t5 K3 {" m
called by procedure DO-PLOTS; u/ P v7 j* _: h! ]
called by procedure SETUP
" Y# `0 s9 C/ }# k2 z called by 按钮 'setup'
/ B4 e, ]) d5 H: X! ~1 ~. j6 R2 @求大神解答啊 |