我编的程序如下turtles-own [energy]5 @, s+ ^% g$ G
to setup
@' E$ U& m5 V6 O, n clear-all( e' R6 ]+ u3 `& ]6 p& T$ { Y0 U* O
setup-patches
: l; n; N" P# }9 o+ A: T create-turtles 100
( }5 Y }; x2 [% F) x do-plots
: |# A, K) |' O- e2 G) y# T ask turtles [ setxy random-xcor random-ycor ]6 R) r5 J* h" ]. M
end$ Y' M2 ~+ n$ d
to go0 P. P% V9 _% W) V5 t
move-turtles
. [. w& M- h! o1 z eat-grass
9 F- d$ I9 B" j8 R. _ reproduce
5 I9 G7 Z9 H( n" k4 L1 k9 Y check-death
1 b, {- P. F8 H regrow-grass
- C; M9 C$ F7 _ do-plots7 k* e& N8 i) ]4 A( Q: x
end
) g4 h& ~' j2 y6 N: V' s! Eto move-turtles
$ _; d: X; B* p6 e o! t: v ask turtles [
' A$ ^! i0 A5 h- C9 I! } right random 360
2 i! g3 A# q# Z. A. h/ b forward 1
5 `7 g: U r. r4 m9 ]# e4 I$ j set energy energy - 1
5 b" C# }( [& x* m7 U ]7 O3 `. m+ M7 V# A* I: r2 `
end
W' j7 l6 V; q i2 v9 f: {- _6 n3 e4 Lto setup-patches& y+ l+ s) o+ z" f; ^
ask patches [ set pcolor green ]
% _, U% y6 G8 `. U" p2 N( Q1 jend( |/ z) X2 V7 D9 V
to setup-turtles
4 T e- v7 |$ F+ ^" g/ P# N create-turtles 100
/ \3 X+ v' |6 G) {- o9 g ask turtles [ setxy random-xcor random-ycor ]
K9 y6 O: {( O1 k" I5 I" O. I, \end& T7 M c( ]" T' @% A0 B K- A
to eat-grass$ r4 l; D H8 m# ]% N
ask turtles [
5 [; k' R( k: M if pcolor = green [
8 s$ f3 h0 R! e4 _5 n set pcolor black$ N: }9 ^$ E) j. S! T
set energy (energy + 10)
c: u; | G/ J ]; g) y) I7 M! N0 `3 e, _/ K& U/ l
ifelse show-energy?
( u, U) I6 D) B# R3 n [ set label energy ]
2 R' N6 `$ f% r3 |$ i! g! ` [ set label "" ]
' Z, G' X p$ Z9 \, I2 G9 `- _ ], @# G; _" K1 b2 b
end
5 P: s7 y; i7 N* {; z$ M9 _to reproduce
( j2 b$ s: a3 D' q) ? ask turtles [/ o; V F7 V' m% L/ M$ C- @
if energy > 50 [
8 x9 k0 ]4 e& [( h* t% b* Z set energy energy - 50
/ I4 v% W2 q1 N' Q3 l hatch 1 [ set energy 50 ], k0 K2 M, A3 U' u
]
+ c) c/ f; x. s ]
* \$ O! w" s& u' Z" i. p" V [end2 u. h" B6 k* h* x4 u9 O, Z
to check-death: }, X, f7 G0 w/ |7 X
ask turtles [
x8 h, l6 L, } m5 @# p if energy <= 0 [ die ]1 [- W* R/ x# g V- ?+ e: p
]
7 l# E( O4 v E- { mend
0 A8 ^5 L8 {7 p$ k6 Wto regrow-grass" z ^ \ j% j* [! W7 O$ V/ c
ask patches [# D/ a* P4 m1 v' {0 m* t8 y
if random 100 < 3 [ set pcolor green ]% V! t2 W6 j0 X0 M9 d8 b1 v# F( j
]
4 H3 m( c1 }4 u) L4 q& pend
4 |3 {0 O6 r# D2 u: `to do-plots7 `) Q- e9 m# D( f# ~! {0 a& U! q g
set-current-plot "Totals"
( ~2 n' |4 E; y1 y0 b) \ set-current-plot-pen "turtles"
* k# ?, M1 e; [4 n+ d2 [ plot count turtles
8 w, P) B+ Q; J- |' X. b set-current-plot-pen "grass"; {& v% M3 w* E G7 S _
plot count patches with [pcolor = green]8 G& W5 z2 l6 W- g/ i1 Y0 W3 X# |0 ]
end+ O1 P( D4 d) `1 o
可是运行时提示no such plot: "Totals"9 j# I6 v: O, H/ k; g' i
error while observer running SET-CURRENT-PLOT
8 @4 P' Z3 x' e3 o0 ? called by procedure DO-PLOTS9 `0 T2 x# O; H7 @
called by procedure SETUP
# t* A- N/ s6 j) Y# R9 V' I( K called by 按钮 'setup'
( e3 I8 v! H$ n& H( l5 T* @求大神解答啊 |