我编的程序如下turtles-own [energy]
. f9 M8 B! C/ U% I& W2 U, U% c* N. G' Dto setup) D0 x* r! O1 p. n1 S$ I7 l
clear-all
$ a- P- Q; X* R setup-patches/ c- k+ o' ?' }' D0 @
create-turtles 100
" S, ]- s% b" x8 X: ~% T do-plots
* L) B$ T7 m3 R1 n9 F+ B ask turtles [ setxy random-xcor random-ycor ]
( X% S+ p' M6 Tend
# f2 L" x& Q2 p6 C* v5 g1 S, W2 zto go
' s4 T% H* t$ x. q move-turtles# d* l3 b! e& B l9 q4 i; F
eat-grass
& P6 E5 M- q" u reproduce
. x H* v4 Q7 X. f" T6 C check-death
4 c/ }- X h" \4 W) ?" \! C6 b regrow-grass7 ]& A# x9 G' v4 n1 g: n
do-plots M3 c0 p! A' ]( D) i
end) j1 {+ F2 h8 X$ C3 `4 q6 X, u* Y
to move-turtles
) a+ m4 Y4 g6 _- n0 `6 h# q ask turtles [
: D- q: Z7 s' G* o$ W* } right random 360
% W. U5 R$ a: I- w! w e forward 1
4 Q# S7 T* E5 }( y! A set energy energy - 1/ K- k E" d @1 u' j
]
5 w+ P1 G4 n9 e# V- d7 yend+ g m/ }2 {, u" d2 {/ A( `
to setup-patches. }! Z6 }8 Z# n$ j, ^! w
ask patches [ set pcolor green ]
8 s4 x4 \3 N8 H$ p$ m0 X; }end$ C% {6 F) |& \( |$ q* |, I
to setup-turtles/ T# e# y* t6 j* m3 o1 G
create-turtles 100- h, i0 Z0 S+ o7 ~
ask turtles [ setxy random-xcor random-ycor ]
* c' d# Q! B1 iend. R% J- L* f( O5 {
to eat-grass }" }" V) \, ^( T. K
ask turtles [
4 S' D' L* i' [9 h/ i' ^ if pcolor = green [
3 e( ~0 { q& i" r" T& @" |8 D5 H set pcolor black$ ]! f- A& P9 l" C
set energy (energy + 10)1 H [- R9 \0 Z* Q+ J/ g; b, q
]- u5 d7 G$ ~4 T% ?: {. r
ifelse show-energy?
- p! v8 P8 h7 h% ?: s- F# q: k [ set label energy ]
% W( p; c7 j2 B, m [ set label "" ]& ~: v. h1 F' {1 _3 v3 y
]; H; ^% l) j' `% L$ n5 X
end+ L- J& U! k' Z
to reproduce$ E5 e( e: G; R4 M1 L: i' }% ]
ask turtles [4 s, T; A; h9 n1 \$ n7 m* Y
if energy > 50 [1 r+ m D7 `. ]
set energy energy - 507 W9 g6 i; a% w/ ~) [, ]5 f- r& z4 t" m
hatch 1 [ set energy 50 ]6 X. i" r: }9 W# w; `7 X; C
]
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end% G& |" U; g$ V, \; B# g2 }- m! p
to check-death+ B }* \* R. _4 ?
ask turtles [0 s# h/ r3 ]8 w/ y
if energy <= 0 [ die ]5 Q2 q+ n/ a( ^$ I+ S0 n- V1 y" m8 t
]
) _: N8 X# F' j3 W+ |- ^5 ?: J5 O7 hend
0 T( u6 V% g$ o3 b8 f& Z! Jto regrow-grass
Z& u( n/ {% D, ~- b ask patches [
" `! c/ |( P# `& O if random 100 < 3 [ set pcolor green ]
6 a' \6 E9 U! n* r( V ]7 z. d, U- s2 B, w, y
end; r9 S" f' i) b2 b* u; Q- U, D; |9 J0 w
to do-plots- ^9 s3 q+ ^) X2 M& }; B- k( \
set-current-plot "Totals"8 J1 a( @( d T6 S5 o9 Y3 h3 _. S
set-current-plot-pen "turtles"4 i" ?+ D7 s- w2 o% C/ a
plot count turtles
, x$ R/ v! A' G. F9 Z set-current-plot-pen "grass"
/ I& R! [# f* L plot count patches with [pcolor = green]
/ u" m& ~% m' Oend
" V- ?4 |* ]+ Z6 v4 B, N可是运行时提示no such plot: "Totals"
- [; e6 i j7 @2 N& R4 k# p/ `error while observer running SET-CURRENT-PLOT- k6 N( S, N Y+ ]' _
called by procedure DO-PLOTS
2 u; S+ P8 _5 A6 }8 H called by procedure SETUP
3 J1 P8 p* t; k6 R: Y( f% b1 o$ n7 } called by 按钮 'setup'2 S7 t8 f7 B2 D8 k. B5 N
求大神解答啊 |