我编的程序如下turtles-own [energy] J' R! B3 M* Y U6 a
to setup: @, `0 k# v, `" M' ^' A ^5 ^6 w
clear-all! |9 M( x- Y \! _# s* p; w- C4 j
setup-patches
' e. N5 h$ a; q" i4 v# F! q1 E, w create-turtles 100
: p+ E% |' X& c do-plots
t3 b% x% @* Z ask turtles [ setxy random-xcor random-ycor ]2 m7 B6 P- [: T: d n# g$ i/ u5 V/ ]
end
- \8 T1 Z) i/ C: h& v$ }to go
/ D# f" Z9 \( F4 Y" N move-turtles
8 v$ z! ]6 o2 b6 t- y eat-grass
. t# w6 p8 V' S) t1 w0 h+ u reproduce
! I: k; W6 {, N2 E check-death3 G. \6 q7 T8 q) D, f; m4 h3 W3 a
regrow-grass1 h4 k3 V0 M) J. R7 L& S ^
do-plots
# L7 F$ `' Z- u5 c7 q9 uend
4 j- n) {$ Q! \) h: tto move-turtles
) p+ n- N, x' A/ _( E4 [- s/ e ask turtles [9 d+ W( f" s0 H/ E1 V
right random 3601 X5 m3 P/ m8 e0 `
forward 13 y% e4 O. g( [0 X
set energy energy - 1
% f7 Z K6 \, r% O( d ]
' k4 d* B; s4 xend' A' Z& @! H6 ]# d8 u* u: e
to setup-patches* i: o4 v# H* H( G" }2 O
ask patches [ set pcolor green ]0 J3 ?; N* `6 h$ R& H
end8 k7 l6 q- T. K+ n
to setup-turtles" W5 L, x: D# E
create-turtles 1000 t9 X' B0 X0 T/ c( [+ E
ask turtles [ setxy random-xcor random-ycor ]
+ H# V' V5 t0 } U6 |7 ?+ Q2 c( b; uend) |6 }/ F: ]; X4 i: _3 f' e3 C1 G
to eat-grass* Y" Q8 Z* T" a
ask turtles [8 i5 I! H4 e" Q4 g- |4 m
if pcolor = green [% |, \& Z3 ~, w! Y$ q3 w2 T, c& f
set pcolor black
4 K6 S. w$ z" S& X set energy (energy + 10)4 P6 r+ [3 ^3 [! v6 m1 x% U
]% w5 z& @8 `" J6 b- I/ g1 E w# K
ifelse show-energy?3 J0 F: m# B$ W/ h2 h0 G( P
[ set label energy ]$ L- @' v6 j9 X/ {& X
[ set label "" ]2 x+ o, J! {5 Z2 b
]
* h$ {; ~( \# h" Zend
# W8 r q* H5 n' `! J% Eto reproduce- _( J" F" S$ y9 b2 @9 {
ask turtles [
' r5 t, k8 S$ } if energy > 50 [+ |- d# x$ X5 B0 _; d+ l# S: F
set energy energy - 504 Q& |) k% h; h$ r% s% H" Z) K* ]
hatch 1 [ set energy 50 ]
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]0 Q8 Y0 \# ]# V, h7 n
end
4 J& I6 q& ^2 i1 d- D- Tto check-death) S9 |* n% Y9 D% u
ask turtles [ V7 b, {! Q* s1 ?" \
if energy <= 0 [ die ]9 I# G4 H( n2 n! }3 u. y
]
- V& R0 F0 k/ q, Eend: ]: j# ~" F8 L4 t
to regrow-grass
& z6 p% B, _0 W8 | ask patches [. n. R" f0 Y% M" v5 H
if random 100 < 3 [ set pcolor green ]# U! P$ m P. [: ~, F2 A" Y
]8 q+ n7 H- `. [" o
end w; w5 `% [1 g$ N$ }# q l" E0 }( H
to do-plots9 a4 S& x6 g k% E& t0 \
set-current-plot "Totals"+ t! v j; T0 ?: C! p7 f7 X& d
set-current-plot-pen "turtles"4 ~6 q5 y8 B& U) y/ e, X
plot count turtles- k2 V' F7 O, o- A+ S1 [ w
set-current-plot-pen "grass"4 Z" b3 h+ Z$ I8 z6 O" k$ n
plot count patches with [pcolor = green]' ?' O- S5 |( Z3 s- b! {( G
end
3 i: X5 T) \3 w( _3 t* W5 R9 M可是运行时提示no such plot: "Totals"# d* O9 \& l# @( x- j6 O+ p. Q
error while observer running SET-CURRENT-PLOT. h! d, |1 s) u8 n7 R1 F
called by procedure DO-PLOTS. r% J! ?+ `8 ]
called by procedure SETUP
8 n0 V3 Y/ z6 o! Z& d8 A4 m called by 按钮 'setup'* H3 e( I' [% q4 e$ \- D
求大神解答啊 |