我编的程序如下turtles-own [energy]
- o3 O* ?8 ~- Y( w1 d5 rto setup( p+ G. i7 b! `: u" l4 O; A
clear-all" \/ J, `: w5 B% Z
setup-patches
* b/ g1 ?7 X, J/ Y. ?4 K create-turtles 100! E* Y9 E3 B' |9 R
do-plots
2 n( F( w0 X" m" t, X. ^ k. A ask turtles [ setxy random-xcor random-ycor ]. m$ L4 {1 L' I2 K+ U' T9 I# Q" B5 _
end9 T, C4 c/ P% [( x% [( J. I
to go/ l ]- S/ |# G9 w, p" T/ k; p2 o
move-turtles5 ]& @3 B" Z. J# V2 D
eat-grass
& V- A' i9 j* q, G- h reproduce
7 ?9 h5 |3 }" Q7 C8 o" x- Y' e check-death
0 Q' [* C1 |/ C. H6 z regrow-grass
: @% l5 o4 N, c7 ~' T' o7 w do-plots. S, g. h* ]; B3 |8 X- \' b# ]
end2 w* `& d1 P; g, c- a
to move-turtles6 e- V% a/ t4 {: r$ ^, I
ask turtles [
2 L8 ~% P) t; E right random 360
s& S! ~% e) I; N5 q3 L( j- ^ forward 1" i% O' R5 Z/ }. i" ~
set energy energy - 1) ?+ u) A% c N* ^/ p
]
/ p* K% q( L5 K$ wend* e2 |4 N3 V% E
to setup-patches
7 @# H0 ~9 E5 f/ f* a- b$ ]- J ask patches [ set pcolor green ]
# a1 W4 _, b$ h& v# Wend+ E, X _; I' v ?4 a$ G% }1 S' ?" q
to setup-turtles1 n/ J' T0 w3 E8 ]) c3 U5 `
create-turtles 100; O6 N( C$ r: w) T: i2 h
ask turtles [ setxy random-xcor random-ycor ]
$ `/ u+ a! L; \! g6 i/ Tend5 b* [4 p! i1 \
to eat-grass( n5 j. k8 \# N. F) L6 r
ask turtles [/ c. \6 @9 Q2 N2 Z7 w: A0 o
if pcolor = green [
! g0 E* B) M- i. y9 m8 Y set pcolor black9 S# p2 E6 h: K+ Q0 ~
set energy (energy + 10)) k N' k- G, V1 P& F) h( P( x m! k
]
6 y, ]; [. t; I( Z n3 g- l/ V ifelse show-energy?( D6 U" V4 U8 D) C) v& C
[ set label energy ]
2 R- q# H% r+ U6 n9 t# ? [ set label "" ]7 r% S5 q% |( v7 q8 _
]
4 g/ E* S5 p' W! M6 xend- F# R7 l( h* A6 d$ a
to reproduce
( T6 [+ `: P- W" a/ W ask turtles [: Q- k% D5 T) ]9 i* q
if energy > 50 [
9 m9 k' P* z+ R/ M/ K6 V set energy energy - 50
+ x9 ]& p2 V4 w' a% } hatch 1 [ set energy 50 ]
8 [" x( Z* S U% p0 E }; D ]
( L C; ~9 n6 e& N# r2 ^3 I ]% c0 n( J- k5 E- j
end1 V5 H3 F% o( W$ e# Z. Q
to check-death: M# t4 r$ H# e+ ~; K* a
ask turtles [. E( K% n3 X5 B( |
if energy <= 0 [ die ]
9 r9 `7 _5 N2 A. v* ]: v ]0 U" g; h- t8 u0 q7 p
end1 R8 q6 ?* ?2 M5 {
to regrow-grass" Z& U# ^0 _' A3 Z( s3 J
ask patches [
& r/ @/ R; m% v8 W' h if random 100 < 3 [ set pcolor green ] t1 l6 g1 d. s6 n& r0 l/ C- @* A
]# d. x1 E9 ^. p- K5 H: J* b
end/ x! `0 D# Y9 a4 i5 @
to do-plots3 Q% e w+ @- j6 ]" k/ o) Y% o
set-current-plot "Totals"2 d4 @# r5 O' M; l/ O
set-current-plot-pen "turtles". ?! s$ Q1 g! U$ i% J# W; P1 B; z
plot count turtles* E! ` k7 j. v9 i
set-current-plot-pen "grass"; t0 O8 |" @" j$ [$ P, t, i3 T
plot count patches with [pcolor = green]
% c( i3 w$ T7 Z' }3 N# Y! aend# u% a. W: a' i- q3 t4 d
可是运行时提示no such plot: "Totals"
" A: V; k# i& z! {- Cerror while observer running SET-CURRENT-PLOT
' E1 S2 Z" u; L+ ~, u% O called by procedure DO-PLOTS. q" h4 b) |, D5 m* p8 k4 D
called by procedure SETUP
7 m9 k+ k' T* }9 [1 s called by 按钮 'setup'# d& P) R9 ?) _$ K# r
求大神解答啊 |