我编的程序如下turtles-own [energy]
* o- u3 E* a, }- T c6 Yto setup: R* ?8 p, y) I1 q
clear-all) m9 o# c* R+ ^, p: G/ U# i
setup-patches
6 k* X, \/ c i( l8 s create-turtles 100' e V3 z% M* Y& y" M
do-plots f/ M6 F" H5 p7 G0 A; E( a1 ~
ask turtles [ setxy random-xcor random-ycor ]9 K, a5 [4 R I% U' y$ W' G6 k4 \
end
1 ?/ X, f% B( L3 L( T7 a2 [to go
7 Z# p' }1 {' J4 e$ K move-turtles
2 q2 e! t" M* E+ R$ B eat-grass5 m& G' b$ x0 S4 C6 H
reproduce3 `' g+ ]- D7 t/ Z9 C7 o
check-death2 _3 v0 l0 o/ a/ t* ^
regrow-grass6 N; [" o* V6 s) h$ V! u" ~
do-plots6 b% r' d6 y k) J
end# _7 h* Q: _3 u: |! T$ Q' \- z
to move-turtles# R! O7 v E! Q/ |1 R* p
ask turtles [
2 v3 P9 P, K5 P7 J right random 360
7 T$ r& h! U; }3 H4 r0 b6 _ forward 1; {1 i; j3 l7 _9 u( F: |
set energy energy - 1/ J1 V7 s3 w- p9 T7 q
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end$ F' E8 l- S- \# j! v( {, b! ]9 m
to setup-patches
9 G4 R, }% I' P ask patches [ set pcolor green ]
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to setup-turtles- P0 M$ @+ t% {3 s9 c- M* U) z
create-turtles 100
4 J: h0 K8 i8 w/ m: l& t ask turtles [ setxy random-xcor random-ycor ]2 \# h& }* H3 L/ M' T7 I- ]
end3 D% t6 ^# E: g+ z
to eat-grass
0 A$ G' z. T8 d0 h U+ F/ ? ask turtles [) p: ?4 K9 n* R1 J$ e
if pcolor = green [$ H5 `/ X' c0 |& O
set pcolor black* M A5 h) [' I. G! A
set energy (energy + 10)* r8 a4 ^6 \$ p3 A( c- k, ?
]3 L% W l# H4 o5 L+ h
ifelse show-energy?; @ Z/ `3 P( `
[ set label energy ], E$ T) \; k# H2 j" M& h3 h7 D. B7 n
[ set label "" ]
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to reproduce
1 ]! i2 R" _& Z" l5 Y ask turtles [ h9 g: j+ C2 A
if energy > 50 [1 p- f* U: s3 P
set energy energy - 50" O) I; l! q$ g# H
hatch 1 [ set energy 50 ]
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]
) J! f" @ m: `- n# L: U9 J" G! D' Cend
& v. j) Y! M C3 n6 |to check-death6 A, p2 P( T" L* I; H& z% [
ask turtles [
% G/ ?* D. M" u+ [+ v5 H u. z5 c/ m if energy <= 0 [ die ]8 ]2 k: a2 T! n. O4 m& [ S
]
( L8 G4 Q( }7 J5 f/ T; ]% dend
6 s7 E1 y, [3 n9 l+ P$ g# q5 pto regrow-grass0 x9 t3 z' S* V7 f! Z
ask patches [% |3 N3 D U( M- L6 {) A) [2 p0 o
if random 100 < 3 [ set pcolor green ]# k) r1 Y+ f; b0 ?! M0 l% q
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end5 g4 z* n5 i* O+ V \
to do-plots
3 u1 X6 l+ c( a9 X set-current-plot "Totals"4 W( q I# d ?0 {
set-current-plot-pen "turtles"
3 \# j! d- j) P- x plot count turtles
' ~3 z8 I! e* Q set-current-plot-pen "grass". |5 h, i* D) _# A5 a
plot count patches with [pcolor = green]
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可是运行时提示no such plot: "Totals") R3 s+ P7 }2 n4 R/ E5 i. q
error while observer running SET-CURRENT-PLOT
+ ^& N L2 k, F called by procedure DO-PLOTS, U$ N* I" H" Q: n4 ?9 g
called by procedure SETUP
/ H/ N$ x& n1 n1 T- ^3 E called by 按钮 'setup'. R+ @+ F1 S5 K! m
求大神解答啊 |