我编的程序如下turtles-own [energy]) F5 ^* ]9 D2 g, J c! e
to setup R: l5 D& k8 n
clear-all
: Z: q. Y+ H0 B6 \/ @* o% x+ K" i setup-patches! {9 W7 M$ J4 o
create-turtles 100
* S; a8 ?1 Y, W. D n, Z do-plots" ]4 ~: s4 J) e/ a! j' y8 _
ask turtles [ setxy random-xcor random-ycor ]; P: y3 ]- {5 B) ]3 d
end3 x6 |3 C3 b) J7 R# E" X
to go8 {+ T) o6 y, D$ V
move-turtles0 w7 N- o0 I2 W. o# S6 s* d
eat-grass
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check-death
" c* O/ |4 d3 y% |6 [7 A! c, i2 _ regrow-grass4 Z# c0 i3 S6 G) i* J
do-plots
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to move-turtles, {9 t/ V# Q/ }5 U* x+ B/ `
ask turtles [
& M' w6 @; N1 P$ j+ P7 f" N( V right random 360
( Q7 a4 Q. v; ^: g* B2 Z) ? forward 19 K/ a( k( L- e3 _
set energy energy - 1
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end
+ q$ t4 [: F4 N4 Hto setup-patches: ]+ g/ Q( |0 ?1 v! F
ask patches [ set pcolor green ]" W6 d2 u7 g# O8 P j8 m
end P, k* ]) x' ?+ C4 I" @" X
to setup-turtles1 i. b% k s8 U# L" F
create-turtles 100) m; |4 N# v+ B% _! e9 [, S
ask turtles [ setxy random-xcor random-ycor ]
3 C5 e0 y& C% y9 {% H/ o" B: _+ aend0 F' T( }5 U: u' r: ^/ p3 R) ]
to eat-grass3 G- c/ C' o3 z6 L
ask turtles [; X+ U5 @! r& t; ?3 H1 w2 p0 K+ e
if pcolor = green [8 R9 C. s- Y9 ?$ D7 x" b
set pcolor black
/ ?: c1 x7 }- l- D0 A set energy (energy + 10)* A* @$ v1 K( r0 F. q/ ^: B
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ifelse show-energy?+ y% |0 Y0 f4 d7 i2 q K
[ set label energy ]7 M# {. |* O4 H% `
[ set label "" ]
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" f/ ]6 h+ S. M8 I, vend
F3 B9 ~& K# Rto reproduce3 E) x- J/ e9 i) ^& B' U: W8 ?- s
ask turtles [
7 L1 z: S0 o0 k6 x if energy > 50 [4 q7 E$ X+ g1 b0 l4 n
set energy energy - 50
8 u: _* u$ P* [" c hatch 1 [ set energy 50 ]" c) p+ A: j5 Q& \! P4 j4 z
]
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end/ w8 T9 A9 E" r
to check-death0 V/ o% }% u, T b' z1 {7 x \4 O
ask turtles [0 R0 v5 x- f7 J0 }3 J- D# T
if energy <= 0 [ die ]
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end
* e8 M' o6 S4 }! W% t: xto regrow-grass) R/ |, l7 H& o# S' ~
ask patches [( u0 |: l4 l. ~
if random 100 < 3 [ set pcolor green ]
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end% ^) L% k# x6 t- A9 H
to do-plots
7 C/ N& P1 E1 z; G* S) F7 U W; a set-current-plot "Totals"
7 b0 a. `9 \' _6 g: i set-current-plot-pen "turtles"
3 M$ l2 b4 f* A B6 I2 X3 k plot count turtles0 @6 r. n. ^( j% Q6 E8 F+ m
set-current-plot-pen "grass"4 J' j" j; K$ w0 o
plot count patches with [pcolor = green]
& d1 D8 K4 p9 uend
1 T- O# Y, S- [: N- ?$ D# R, Y可是运行时提示no such plot: "Totals"
# N9 s. S5 G6 [3 `" M* terror while observer running SET-CURRENT-PLOT3 ~: F& [5 ~0 X! p! ]
called by procedure DO-PLOTS
# `3 a+ [. _ T8 _( d* `) o called by procedure SETUP
3 ~ ?3 t' l4 r+ W2 m I3 q& c called by 按钮 'setup' f G9 Z! U/ X/ J, \0 @9 A
求大神解答啊 |