我编的程序如下turtles-own [energy]) o0 B1 b. E2 e' S: M
to setup- p1 R9 G% Q7 t; F0 U
clear-all1 C' N# y' ~5 e0 r/ `8 h
setup-patches
n7 w M6 E+ j2 _* d create-turtles 100
% V- S6 `# B4 \4 w do-plots
: i5 C9 s1 I7 ]0 _4 K* E' _ ask turtles [ setxy random-xcor random-ycor ]
# }, ?3 G2 t/ Aend- ?0 y9 _, @- v. q4 ?8 ?! |% l
to go
" p; k- `/ F) q' E0 P+ ^2 D+ ^2 P move-turtles1 \# C: F$ Z, h h X" b5 J2 T, `
eat-grass
/ @* ]6 j3 p z3 H4 M reproduce) i2 d" v N9 J& j% B! r9 F
check-death
% d6 {- ?) G2 v& \* o regrow-grass. T6 F3 _- L! K1 a: ]/ x. w" v
do-plots
) Z4 {- a# E2 I) J. m" `# gend0 X! F5 ^5 X0 b1 |- \7 d
to move-turtles+ M1 O6 x) J& R" L0 W
ask turtles [5 S( Q5 L1 E8 Y0 r" T% G
right random 360
! a( _4 X1 w. l0 u. M/ _: P6 o0 n& c forward 1% _- Y7 ]% ^7 o8 t% ?
set energy energy - 1
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end
3 C! a. t5 b( X9 y' T4 [0 Sto setup-patches
; N; {9 }2 p' F. a5 D! ? ask patches [ set pcolor green ]
+ n, j/ V$ _9 y9 Qend, S% L3 ?# f( t0 }: L
to setup-turtles Y1 l, c0 X4 v9 k& q N6 \" L
create-turtles 100
; Y- J& x& q- T- O4 F5 A( t ask turtles [ setxy random-xcor random-ycor ]
- h0 l9 l! d! z& |9 E! ]end
7 a$ W, U7 R# O" |( ]- {. eto eat-grass
2 A0 V- O+ d B$ k% Y1 c ask turtles [
4 h, Z* J) M/ R6 i" F5 l/ ] if pcolor = green [' T1 d, {! q5 E; ~0 ]5 k
set pcolor black2 x7 Y( ?6 I0 ]
set energy (energy + 10)/ e3 |4 H: f& M" N; m- Q# O
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ifelse show-energy?/ E6 _. S5 l) g H( u+ J' A
[ set label energy ]
: r4 l: H& P- w2 J [ set label "" ]! E _4 X y+ N0 |1 i& C. A
]
( N+ Z; G- Q- H4 mend6 V! [3 N. I; J' f! O/ K
to reproduce
* ?5 J3 I& H% D" n3 x3 a' R0 D5 z/ M3 ^ ask turtles [2 H' O+ d$ U. o( E& ^9 Q2 Z! X
if energy > 50 [
: B2 \' ?6 ]' o5 | set energy energy - 50! t$ u, M2 _: g. x9 Q* J! ]
hatch 1 [ set energy 50 ]0 N* C2 n) u7 M/ b6 T
]
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end
& a2 _% N/ `8 E* ^6 A2 O& Q! K" lto check-death
8 L5 b+ { T" m- h ask turtles [5 J- H& K4 Z; u0 H* @5 O: t! t
if energy <= 0 [ die ], |9 I6 M- l! `
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end
) Q( [$ r& k0 V2 V9 @3 xto regrow-grass
$ a: d# a' E' w2 t; i! [ ask patches [
: f: \. A& y" j# z- D if random 100 < 3 [ set pcolor green ]
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end" M4 a* {7 p4 {
to do-plots
+ ]/ h* v( C9 ~) x3 F3 k set-current-plot "Totals"
3 H" q1 H. q$ o7 u3 M- x set-current-plot-pen "turtles"; J' ~8 t- [: M3 H
plot count turtles
$ I0 L5 X/ ]* u1 ] set-current-plot-pen "grass"
$ D4 W- J+ M. X% e: N plot count patches with [pcolor = green]
& e( {& r+ k0 R" K3 j2 E, yend
; T% [$ ^# h5 W" T: n6 @8 E9 h可是运行时提示no such plot: "Totals"
+ ?$ C- @: b/ {2 B8 [# Ferror while observer running SET-CURRENT-PLOT
: Y8 U& p3 I; W+ A. C called by procedure DO-PLOTS
9 j% ]+ }) j( }' w+ }; q called by procedure SETUP
$ _* K! [" H1 z1 h/ h called by 按钮 'setup'! }; b( Q5 ^6 D* g. ~
求大神解答啊 |