我编的程序如下turtles-own [energy]
% C! X% K+ G7 C/ E) w- t8 ~to setup* i* v; I3 j y! r( `: I% q( z
clear-all4 Q7 f) S# j- j$ Z" Z( B7 b$ F
setup-patches. V# ^* I- I: q
create-turtles 100 U. a% c: q1 u" u
do-plots
+ _% X1 n, d/ N ask turtles [ setxy random-xcor random-ycor ]
, |5 H: s; S Y) x1 W2 `end
# l, ]; N9 w4 {; Pto go. e6 R. s6 V- A; h: J0 o1 L6 N
move-turtles m: W) w, x! @+ K1 D; J
eat-grass
' J: Z9 A3 t0 c& T! c reproduce
0 P9 {% J9 f. z2 Z% g2 b check-death
/ B- K9 L, D4 _1 p0 w8 g regrow-grass. ^8 R) D. I0 R5 Q% G
do-plots: x, T) r' D8 |- M: O9 M* e: P
end7 S0 P, y a: Y* e
to move-turtles
+ K% Y- }9 _; Y' X0 z ask turtles [" x t' `/ J; K& c' u, I$ u
right random 360
7 i7 n1 a5 f; q forward 10 [/ r" J7 \# O8 E. K
set energy energy - 15 ^# l' R0 U8 Z
]4 q; z8 E. n; v* R8 b) c. }4 {* V* ]
end4 Y# z0 V( t. r& J4 T3 t( W
to setup-patches% z; K, J( ?! X% d5 l
ask patches [ set pcolor green ]! t( ` z, D1 |) g: H. C/ q" ^' ?
end
% p+ n4 ]% I4 e: G0 u0 jto setup-turtles. A$ P4 @: _7 s# |7 a4 t! V$ d
create-turtles 1004 Q7 l2 [; \6 Y6 K
ask turtles [ setxy random-xcor random-ycor ]0 Y8 i0 j- a% e& D
end! }; ~) y) n' m% J V
to eat-grass
* J6 v' C( g! j/ [& v- Y4 _ ask turtles [
( H# T9 d0 H' w# T( B8 |6 t if pcolor = green [
# R; n) Q8 a$ r1 d8 {% _ set pcolor black* n, W+ N: [8 p0 U8 H9 A v8 B! V
set energy (energy + 10). o+ M7 v4 @% w# l! L$ o8 `
]4 K a: s" {( Q( b. A/ M% B
ifelse show-energy?
+ Y! j: ?3 K, N [ set label energy ]& d" ]3 q3 I5 M( D5 H% Z: o
[ set label "" ]
0 u1 _# b, G& S: @; M ]
5 x1 N: L) ~6 e( {end
& E: ^" f# \* F; q9 Y% _to reproduce. ~$ b" |7 J4 h& G+ S' H
ask turtles [
& O6 ?# ?* U* i& i' ~! l$ O if energy > 50 [
0 e" o+ r; e# v- ? r! p set energy energy - 501 z2 F% W+ O/ r
hatch 1 [ set energy 50 ]
% r" v0 @2 @9 C2 F6 C* U ]" r7 ]# U4 r' m
]
7 x9 ^8 J# ~- X3 u9 _end _( m) E' w1 H0 ~$ c: s
to check-death
7 I( [9 P. G, R2 F O+ T0 ? ask turtles [; ^5 H& N% l/ h V) m
if energy <= 0 [ die ]5 [- J5 q0 C- }, D, F- \- i. X
]
. \- e# U; W2 o' x- [7 K: D0 Dend8 Z6 e; F; V6 Q7 M- l0 `/ ?! x( k
to regrow-grass
" W) F' G& R( |) k' \# f( [2 c+ H ask patches [
* B/ X' r4 v4 C" \ if random 100 < 3 [ set pcolor green ]
; Z" U! |% r; j+ _5 g ]
# @* T1 M4 _9 ]7 @! [+ t2 Pend; {1 e) u2 G$ K+ i5 u
to do-plots
0 e; l# [; Q( A+ m set-current-plot "Totals"
$ A# X# j' P6 t2 p. T$ _ set-current-plot-pen "turtles"/ {. e- D- `3 S& R
plot count turtles
/ `5 J) p: B+ W. n, ` set-current-plot-pen "grass") d' u) D! f. J
plot count patches with [pcolor = green]
1 Q G8 F' ^& v6 Iend% \& j0 \" C! ]; t& R
可是运行时提示no such plot: "Totals"; t8 i$ t2 N( W; q) O- C L6 x; w9 w
error while observer running SET-CURRENT-PLOT
( |: ?$ L; ^- Q4 X* s6 b1 c$ t called by procedure DO-PLOTS+ B& L* ^. E. i9 R w
called by procedure SETUP
7 }/ Q$ x' T& Q called by 按钮 'setup'
! R7 R8 z5 p+ U V( `7 I/ t' p求大神解答啊 |