我编的程序如下turtles-own [energy]
( a' A1 _- [, r$ fto setup
2 u. ]6 X$ b! c clear-all
" M! S+ Y1 V% u setup-patches/ H; b# i4 F- ?( t$ u- B ?
create-turtles 100/ v1 w/ G. H5 w+ H5 O
do-plots
: ~7 {( D9 z* @- s/ T8 v ask turtles [ setxy random-xcor random-ycor ]
& q5 i% j/ p. s9 s1 Cend
2 V! }* N+ J$ Z, T7 T% Vto go7 ]4 @, V, H$ C/ P& S; R" q
move-turtles Y9 z" B7 V1 ]: x
eat-grass
; h, u' l' r9 R- w/ K6 P: ? reproduce/ `, Q& f+ S; s4 H9 V G1 G
check-death
* S- ?- |( T5 r- M regrow-grass, F# W: M, r8 C0 M6 j
do-plots: l4 v3 t# S9 z1 i
end/ ]; O' q& X$ Y. w6 s
to move-turtles
( Y; r8 i! O$ w" _+ R ask turtles [& ~& A# Y. X$ x# y: z8 r, v) C
right random 360
6 n7 a c8 }4 d( \3 t6 ^ forward 1" }" |2 P$ j, Z6 D5 _) d* p. S
set energy energy - 1$ ~# l' Q# P( E5 i. ]6 u
]
$ n# w. { H9 wend. G' E d' d$ |2 Y7 Z
to setup-patches$ u$ @) t/ H# V( d
ask patches [ set pcolor green ]7 k; h) v: l- I1 z
end
: M8 J7 c& i8 w; O$ _# ~4 cto setup-turtles! L L# L& h& `8 s" G
create-turtles 100 B: h" w" Y6 k8 g
ask turtles [ setxy random-xcor random-ycor ]
; @- w5 C; i' L1 \1 v: send
& N6 z, a4 h8 Z+ R5 [2 J6 ^to eat-grass
& j; h' B& B% W5 S( o5 | ask turtles [
3 i: y3 i$ U! w( f1 [ if pcolor = green [/ g: p9 _' r. F* L& N3 s" v
set pcolor black2 e0 W, T4 ?6 ^! K' n. s
set energy (energy + 10)+ L1 V( x# ~: m1 D! N) x) Q
]
% U$ X2 T, X2 f8 X" ? ifelse show-energy?- m( p1 F. N- `0 Q* ?
[ set label energy ]0 `" I, B5 F$ f: i& E. L5 h4 X
[ set label "" ]& d6 Q/ [3 f! ^% y
], O$ `. s$ U8 B3 F
end
! I! N$ r; h# kto reproduce/ s4 z& ?3 b/ t7 m! Y* i
ask turtles [
; m. K' S8 n) M7 k% y6 s if energy > 50 [: v7 ]2 r5 L" j( L! ]2 g. C
set energy energy - 50* C/ L( L$ }! s* H7 f
hatch 1 [ set energy 50 ]: O) o5 D! U1 g e; }
]6 m* ~! `2 `3 K2 b, D4 B7 H9 e& {
] ^# ]0 q( p4 b: {
end
' E3 }0 {6 s' x+ cto check-death
4 H' U j7 o0 ^# v, C- c {& s ask turtles [9 K8 [5 C5 {- X% h) Q1 _3 I1 `, u
if energy <= 0 [ die ]' m* x9 c2 P# s3 J% s) ~
]
+ g0 B; z) z2 Lend
( V1 N6 \$ _/ ]/ w% y" W7 lto regrow-grass
, {+ R3 x) v* A5 j4 {/ I+ Y3 {) H ask patches [
. ^3 q. j' G3 d/ f& e if random 100 < 3 [ set pcolor green ]
" g& G w6 c) ?( _9 L( o$ i- P# q ]
5 M: |, E' Q! Lend& ]- z* I. H2 \: A r
to do-plots+ O; `* r+ E# v0 v$ J3 |+ Y
set-current-plot "Totals"
3 B0 o H! o* f1 z2 E3 }$ Z0 b1 a set-current-plot-pen "turtles"" c' P( H1 w# U0 {9 ~8 [ _
plot count turtles
/ p# D+ Q6 f& a6 T" s7 t) x1 v7 j set-current-plot-pen "grass"
/ R8 ?$ X8 }6 t0 R0 i- F R plot count patches with [pcolor = green]; f. V/ M/ {; x' ~& S' o9 f R
end
5 {, ~/ s0 G, p4 K' P* w. r( R可是运行时提示no such plot: "Totals"4 q7 v' I0 \+ Z1 i) r5 J) D' t
error while observer running SET-CURRENT-PLOT
9 z! d1 N" D2 `' C called by procedure DO-PLOTS
% A6 I) |$ A5 K. H% l called by procedure SETUP
! F) P) V" j* R j" O6 E called by 按钮 'setup') f6 w& A" h2 Q Y- ^& d) I
求大神解答啊 |