我编的程序如下turtles-own [energy]7 I# P5 Y8 M3 o& j. U4 W! Q( ]
to setup/ J0 C9 W4 P1 D! E- L- _0 g& l
clear-all$ V' G+ r0 z8 x: K3 }4 J
setup-patches
) H4 z/ s$ x R# i7 |7 {' E0 N create-turtles 100
+ m P p% }) ~7 O' s7 ^) D do-plots0 `; M' d `" k9 {. m
ask turtles [ setxy random-xcor random-ycor ]! C1 [+ L' ?; [( E: x+ u
end
8 E4 E) R7 H- A+ Mto go
8 Z" \) r4 q- R* U: @ move-turtles
1 B3 K+ L! T' t- [" G U! g eat-grass, d( h: E6 c, O9 Q
reproduce
* w0 Y) X' O M# J/ w! M' B: S check-death
: E/ p$ |3 l& N/ u, N& f$ W regrow-grass
& I6 N- S3 c9 e& v; ^) F do-plots
* C% @- n. S Q( \4 m8 X! D) Z3 Uend
1 P& }1 p+ |! fto move-turtles
3 c( g2 g: n7 j8 }1 k5 p ask turtles [
; W5 P) F9 B6 R9 @ right random 360
) {0 n. R: l* ] forward 1' s9 I! x$ w+ Y0 H$ U
set energy energy - 1 ]3 Y9 y+ q0 G3 f! g5 Z
]
) h" [: o$ M- w7 o! iend
# h% r1 T1 t; a1 sto setup-patches
& U% l& {9 W$ G4 ^8 T$ W- f ask patches [ set pcolor green ]
+ E5 g4 X; Y8 H. P5 t [end
' q+ F$ u7 }& S O! M* L! Pto setup-turtles
! Y- {( E9 s: t( w) [$ x) z create-turtles 100$ D, }2 J9 u" o/ t* k5 ]" y
ask turtles [ setxy random-xcor random-ycor ]
( O0 s6 _; z0 m5 cend1 P, r- o+ V- w4 U3 V Z3 K* z
to eat-grass8 ~9 b5 w3 K* E# J, B$ x
ask turtles [& o0 `( T- y, F5 b
if pcolor = green [4 m6 P9 l; U0 a2 w9 Z2 U
set pcolor black4 @; ?! [6 M9 ?
set energy (energy + 10)% @, u6 A) Q% G3 x, g
]% U) ?+ u# `- c2 ]/ U! E/ U
ifelse show-energy?; ~% y- S" d7 ~0 a9 w
[ set label energy ]6 {1 [6 t! x4 y& J7 \" k- p! s; Z
[ set label "" ]
4 A+ x B7 s9 Z* M+ c ]
/ \5 \( x. ?0 H& g8 g: wend7 T; e7 n1 B. U- k: @
to reproduce
: s- ]; h9 K5 Y! l+ J! s9 K( Y ask turtles [2 j$ }0 O2 q* ^/ g9 C( H
if energy > 50 [
/ X5 Y0 Y$ [* i, t( V% V set energy energy - 50
' X( I, C( }9 E+ P4 A hatch 1 [ set energy 50 ]
# z5 n. R3 Y; }' |* e7 G3 @, R8 N ]
4 A3 }3 ^/ X8 u( }$ q+ M/ v9 x0 J0 j ]
) F# J- b Q& Y l4 y# Cend
2 L) V6 t* y% v( f- d5 _5 ]to check-death
. {3 l% F5 ~5 h- X4 M ask turtles [
" P1 |+ C# m8 [% L if energy <= 0 [ die ]* N4 a! ]& U5 `" G, s+ ]$ B
]
4 M& @/ u, [6 t5 yend. e0 x# Z- i. P5 n; A/ o4 Y- x/ q
to regrow-grass
. G a# H1 @) T w ask patches [
2 y' M1 v$ b! K( T& B if random 100 < 3 [ set pcolor green ]
8 [; i2 \; H5 T F: \7 v4 D# z ]9 ?9 Z2 B" \+ r/ S, Q
end
7 a4 N; P+ r/ M: Y/ v$ o5 C/ Qto do-plots; P2 V* b; v" i# p# k: L e
set-current-plot "Totals"/ B) K3 x0 j# `& o4 v4 n0 d4 @
set-current-plot-pen "turtles"
5 [" V/ }# L7 A% i4 a1 E8 @6 l+ W plot count turtles
9 i0 D2 T! L$ u( s) K$ q6 h- G) @# t# _, ] set-current-plot-pen "grass"8 X- ?0 s$ a8 r# j% ]
plot count patches with [pcolor = green]4 f! {. ~7 {, j n) T5 L5 ^ O
end
t8 w8 _; }, i可是运行时提示no such plot: "Totals"
2 n3 Y: P! _$ ]$ {" @3 U2 t! u( ?error while observer running SET-CURRENT-PLOT
/ H, O) k+ n$ ?7 s called by procedure DO-PLOTS) S+ E% Q- R9 F5 e9 V: n( g. d
called by procedure SETUP. q# I" O' x% `# A; J
called by 按钮 'setup'1 Y- k3 C: s1 u+ m, P
求大神解答啊 |