我编的程序如下turtles-own [energy] J3 D) V2 @ |! S( a0 N" F7 p
to setup0 F9 F2 D. l* R0 T4 N; F9 }
clear-all$ E# a% D7 n; W0 Z# L" n7 W. a% w0 q
setup-patches% ~0 E+ L. X! H, P5 O
create-turtles 100
5 h" ^( c$ ]. Y% b do-plots
) l8 f* z0 Q& _ ask turtles [ setxy random-xcor random-ycor ]
' l) H6 R. C) t! aend; D7 E6 }. \( v" @1 `" U6 w, \
to go" h4 R7 ~2 ~( E3 T4 W/ u' e( E
move-turtles8 s9 Y: W% j4 N2 j+ _& ^
eat-grass
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check-death/ W2 d0 U6 R3 r1 T+ V5 H/ [
regrow-grass- U( ?7 p& j U0 N ^, f. F
do-plots3 Q8 L* c2 _9 J2 z, a
end) E6 Q4 }& w% Z1 A+ H
to move-turtles2 T: b/ f9 ^7 _7 F4 M' \
ask turtles [( D0 J$ V8 u. l* I2 Y6 P3 o
right random 360
1 i: t8 t4 r) _$ H forward 1
' _% p+ m) g- \6 F1 T: s2 O1 H set energy energy - 1
( ]8 P" j2 Y4 @: u; _. J1 K6 g ]
! n0 ?# E: ^# z- l: L8 @4 v8 Iend* n" F/ p4 v* G. y: h/ E3 p5 {# s
to setup-patches
: v- c. q. `) F1 `) F; r ask patches [ set pcolor green ]2 m# m) J3 H& Z9 W2 E8 e, B1 N2 n8 t
end
, }9 t* x, D8 d* p. X9 [to setup-turtles
. d0 F9 b5 Z6 E# x) C: M create-turtles 100
1 j$ Y2 t @6 s! C l ask turtles [ setxy random-xcor random-ycor ]
1 D+ E- q* K- Tend
3 }+ Q N7 U8 n6 d( H7 h8 bto eat-grass
: A/ ~& K: Y* g+ l% ^# b. p* j ask turtles [
" c+ T: |, `' A4 l if pcolor = green [: E2 h* F, B" i) a2 C
set pcolor black3 p. }9 r# o8 a1 \( x# M( n0 a% m
set energy (energy + 10)
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2 C r& U% n1 |1 G w% h' b( q" f ifelse show-energy?. f- n7 L3 a8 c* ]' t0 d) _% y& Z
[ set label energy ]4 f- L. L& e* e: {, ^
[ set label "" ]
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end9 c1 @9 |0 V! }7 ` _2 T
to reproduce" o+ i$ \/ o+ u3 T2 A
ask turtles [) ]) P% d7 r b( n
if energy > 50 [& y+ ]5 {" \1 z
set energy energy - 50
- {% ~( p* c& m7 A hatch 1 [ set energy 50 ]2 ?0 B: P! }* O
]
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end
: L7 s$ X( X% {7 X9 jto check-death
8 T: Z- o& d0 Y; |: a ask turtles [
% K5 T' g0 a! T! ~9 F4 N if energy <= 0 [ die ]0 t* B5 H7 Y, f' I
]; Z7 V$ i) P8 k U6 Y
end
" u( s9 s$ b0 j: oto regrow-grass& H/ L) g2 ~5 t, `/ R6 t2 D
ask patches [
% ^* F1 o; e5 j2 Y- y1 y if random 100 < 3 [ set pcolor green ]
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end/ P4 U. v+ `. \& f
to do-plots
' c# y1 _/ I& Z7 e set-current-plot "Totals"
+ K' a% A2 k9 n) w/ I set-current-plot-pen "turtles"9 z [- I( H7 \# c3 Z& W9 \
plot count turtles4 \. O1 _5 ]# z# j# X5 `. ^7 s
set-current-plot-pen "grass"1 H1 S1 J8 l% p9 U( W6 o$ `
plot count patches with [pcolor = green]
" R* Y2 |/ C4 [# \( |end
2 d O0 b8 m! c$ Y可是运行时提示no such plot: "Totals"" z# b! W" F2 F9 Y& g% @) H- b
error while observer running SET-CURRENT-PLOT. \6 P: T$ h* D5 W6 x3 |
called by procedure DO-PLOTS( g, O2 N8 S2 o! q# G7 q4 R
called by procedure SETUP: Z" i" Q' v; e0 C
called by 按钮 'setup'( @" f+ x8 b `* u
求大神解答啊 |