我编的程序如下turtles-own [energy]: `: x% d3 O7 t6 n6 k
to setup
4 a% N) t: @/ O3 k9 g clear-all
* S4 }7 g0 r& s8 ?( S3 j setup-patches) m5 y; H P% @3 ^$ G% z* o
create-turtles 100
/ B% n6 A& {& b. _9 r$ J+ B do-plots
: H; e5 L k( M9 a! L* S ask turtles [ setxy random-xcor random-ycor ]# z0 F# e1 ~+ a$ ?$ ~
end0 M; j5 \8 }" R( A+ T
to go, B. y% ?7 D* @9 m* R
move-turtles, i& m# O3 k' c( c r! X% S
eat-grass
* j X+ W8 i" L$ c+ g% i* S reproduce
+ t2 q$ C& E7 n check-death6 r- n5 Y$ W e7 K% [) F C9 @( Z9 H
regrow-grass
3 z: o! n# L' N. o: L4 T0 P9 O do-plots
7 R' V: \, u7 }end {3 ^% L% |4 [2 [5 O4 a
to move-turtles Q/ _' J# F5 h! V6 \
ask turtles [
; B" k" x1 f, _/ f, C; ]; B5 s) p right random 3607 b: j3 X# \ j. z& H5 G0 d
forward 1
1 B2 e e: [; `8 I2 r set energy energy - 1% I9 I n$ f- ~/ \( {: e) B
]
* O2 H$ L, W5 w. h$ B3 cend5 Y3 J6 L! j# z5 r
to setup-patches
7 h Y& f& i$ s& \( A: y$ F9 Z- N {& t ask patches [ set pcolor green ]- h- m5 ?3 K2 s) F3 N% l" h
end
+ G5 g, v/ c' U1 Q. Oto setup-turtles
8 O- G5 H8 E) A create-turtles 100 k& @/ r; d( }5 i8 j1 |
ask turtles [ setxy random-xcor random-ycor ]
# f0 I: j' P* P% oend% a" f, T1 h' m
to eat-grass { S' r9 h7 ]
ask turtles [
4 v4 m) d/ D; s- Q- y7 l if pcolor = green [! a9 _; P# c* F8 b$ O" X
set pcolor black
9 y( A, `! H- d3 ^ set energy (energy + 10)
2 V5 D! J9 F# K4 p9 F ]
. s m9 D" r- t$ q, B# Q; |, y ifelse show-energy?5 L' ]1 I$ f8 J4 X
[ set label energy ]) {$ h! N' _. I- T5 r9 q. j
[ set label "" ]
8 Q8 b- U8 {' A6 K3 e* n6 y ]2 K( T% H, y9 }* e% _
end
) Z$ N4 E9 S, p8 D4 _9 uto reproduce& ^3 }' E7 ^$ Q3 U& [
ask turtles [" L0 h9 M' Y8 c
if energy > 50 [+ \9 ?6 t Y; w8 h9 Z
set energy energy - 507 C! A' [7 M; k7 B. a* j* {; P. U6 x2 g4 }
hatch 1 [ set energy 50 ]; n5 N) \; E; E' a( c
]0 \1 W# o# ~3 Z7 q
]
2 P. C+ f& {& t1 {* Zend
# M& \- G8 p/ K: I- kto check-death3 Y6 G: T. o+ ?6 J: H
ask turtles [
8 [0 r( \7 p- A0 W$ N if energy <= 0 [ die ]
1 p6 D: h- F) m% B ]
1 N& Q `0 O8 y- P5 Qend
6 N# h3 m- o" ^6 jto regrow-grass
& y/ e4 a0 G+ g5 C/ }3 g4 W ask patches [
0 N% m* U, M( B9 h* D6 ^- M if random 100 < 3 [ set pcolor green ]
; u, |7 S8 e. A' g. E7 g ` ]% l0 ?) i% X X" m6 Q
end- P; |0 \( c/ d+ z
to do-plots& T0 v0 p, }0 g, y
set-current-plot "Totals"
! T8 V7 v( Q9 c5 L1 S/ i set-current-plot-pen "turtles"! |3 k& p0 v6 d/ {( B
plot count turtles
( e: v9 L$ C. k% N: l& @ set-current-plot-pen "grass"
6 j& s; I8 ?- f plot count patches with [pcolor = green]* p. \. c8 n3 e1 T& Q
end: E0 m q# Z# I5 Q- J! k
可是运行时提示no such plot: "Totals"
5 D8 [( @* s. G, ferror while observer running SET-CURRENT-PLOT
( f( H' o9 J2 O% y6 J8 j2 R# v called by procedure DO-PLOTS
) W% @4 Z% R5 @( j* b called by procedure SETUP' j8 `( b# Q1 N# F$ Z4 f
called by 按钮 'setup'- Z5 j( d% E3 V) M( _9 K) V
求大神解答啊 |