我编的程序如下turtles-own [energy]- ?- E h7 {$ ?5 r8 T- q: {
to setup
$ Y: O2 @7 [' F4 v( c1 k3 l$ c4 [ clear-all8 |- H, E* n4 }% h
setup-patches; v( V: i5 f3 @; W E
create-turtles 100: D, B. E+ @7 N& }0 y/ N5 ~
do-plots
* b, X2 M6 S' M7 k ask turtles [ setxy random-xcor random-ycor ]9 e* \, v) {& t4 P
end
/ r' D ?6 c$ s4 P2 }0 r; v+ Ito go
' n- p' r" s: q8 v0 \' p! P; p move-turtles
+ H1 E! A" }9 I/ H, b$ l9 G/ u; M" w eat-grass
, `. M7 ~& i3 M- |# N5 U3 Z reproduce5 E5 P; C3 L/ y1 [$ y- J7 E" I p% s
check-death
/ U( @7 ~% u, q7 U regrow-grass/ t- I4 T3 H4 q, U- |. U
do-plots
& D8 j6 x4 }7 W. H8 s4 ]end, E0 e* D4 k, z2 a8 I* K: M/ _
to move-turtles+ v4 Y1 o1 C2 |# q
ask turtles [
, w! i+ O9 H. J+ G& a8 L& r# c right random 360& B4 ]6 j2 W! ~, D3 a
forward 18 m9 C- | T$ J) L9 N* W+ V' e
set energy energy - 1
' f. P) Y- [1 P X$ y/ o ]9 h3 P) w# ]8 Z# i
end
7 u$ c( x8 x) c+ [to setup-patches# U( T7 ~* Y, \9 j. w/ i
ask patches [ set pcolor green ]
& x' E0 C# }2 x" \$ Z" Y4 o7 Jend: {" t9 Y7 D$ D
to setup-turtles
, g7 s+ m) k2 y7 U Q+ h create-turtles 100& J/ | G, P! A8 r
ask turtles [ setxy random-xcor random-ycor ]
s! { c0 q) Hend
) t7 b' O$ D- {+ ?' H+ `: b! b, nto eat-grass9 ?% A' Z; W+ }/ S0 t" `
ask turtles [! S! l5 p, R/ P
if pcolor = green [. j1 Q2 F/ A$ v; { R, Y0 V
set pcolor black
1 K% U) Z" l- f @2 J set energy (energy + 10)* S" ?$ b4 \# A6 y# D
]
: F/ o2 M/ [6 A3 v: g ifelse show-energy?
2 [# C) y' s2 b" e8 E [ set label energy ]
, F {4 k. U- I% l, Y# H [ set label "" ]
' l Z M1 J; u ]
6 O. M9 z0 \4 @, T/ P# ^8 Z* ~& Gend' I" y8 E1 C t6 [
to reproduce A* J6 `( v8 x& k8 G2 E. X; ]+ t |: z
ask turtles [! q, \5 B! s6 _& z* v! o6 t9 Y+ t
if energy > 50 [
: L: _& e4 G4 h1 A9 C: L set energy energy - 504 D- Q: I0 }; J* z
hatch 1 [ set energy 50 ]! [1 Q3 w# }8 J; Y
]6 w! i9 m/ I2 g, ~# V
]
! V& F' p5 `" t, n, L- W V1 eend" T' E3 `8 G5 E
to check-death
2 g4 x9 c6 _, v9 n$ L T3 n ask turtles [
& }' k1 H( A4 T* C6 S if energy <= 0 [ die ]9 Z) S0 H: x7 m: y& i# B2 F+ K
]
5 Q' L) I0 A. G8 G& s( K8 Tend5 g- P- f* a2 X) i* ?
to regrow-grass
! A% B. d# v0 ?' o ask patches [
& L% W8 G/ |3 L% _4 Z' a+ H3 ` if random 100 < 3 [ set pcolor green ]
4 J$ E8 ?, o0 |+ i/ g# U ]1 b* a8 R* {! v" N6 \! Q
end
6 n& J( c8 P4 Z) R0 U+ Pto do-plots
* |" O8 |& r, Q* s/ i Q; J set-current-plot "Totals"
; w6 d3 Y: ~ x set-current-plot-pen "turtles"
5 w( R* J) I6 N: k1 E$ h/ V plot count turtles% n2 D* R( g$ G! V9 e4 a/ F+ \
set-current-plot-pen "grass"
5 b. h; a+ V1 w; O: A# x plot count patches with [pcolor = green]! _; B. `+ }5 M, D6 G
end; Z) H( }, L' o# _* i2 X
可是运行时提示no such plot: "Totals"
* W+ X8 [; c, H& ]* {$ Ierror while observer running SET-CURRENT-PLOT* w) V/ b0 K3 `$ p* m
called by procedure DO-PLOTS F# d$ |0 U$ j* ?' x/ X4 U+ s
called by procedure SETUP
1 v" y8 m+ p& t called by 按钮 'setup'' E) O9 A$ d5 `7 f# [
求大神解答啊 |