我编的程序如下turtles-own [energy]: a) @* a: T; W9 C+ \8 F
to setup
0 F2 Z! g& z: [3 o7 ? clear-all7 C2 f; L% X% x$ t% @2 A R
setup-patches, {! E1 g6 M) W$ M1 G0 L
create-turtles 100
2 g$ [( l) n3 b# v. m do-plots
, a0 Y) w9 t. w* g% c ask turtles [ setxy random-xcor random-ycor ]5 O4 G4 _, F+ O& F0 |$ W
end
0 l% p3 V! ^$ Y) m7 y! ]to go& D0 c/ |; w4 c& b/ y5 N
move-turtles2 {: o' Z8 I1 ~3 f
eat-grass l5 f3 M. W# I- O; R4 p) |3 o
reproduce1 |! X- X- S4 b
check-death0 G1 U ?# R3 i& P
regrow-grass
9 F- Z" v; Z2 g0 d do-plots7 Z6 Q0 x4 ~- w) {" {. K, Q3 N" [2 B
end0 d6 T a& A6 Z j) H$ }+ W
to move-turtles
- H! e' N, B; z2 w! F! N. i ask turtles [
+ G3 I6 q# n# v/ I' M/ J+ \ right random 360
6 d! B# M# M! l) l2 A forward 1
$ ?$ t( Q+ }- F1 ^) `5 c$ j set energy energy - 1
/ p! Q+ a! r: O ]
* t- W5 V7 s/ o6 [* [end7 @$ B- s7 [% {5 P$ U5 Z! S
to setup-patches
) \4 y4 l0 T, @& b ask patches [ set pcolor green ]
8 Z, h) \$ a" K" X6 ^end8 r% J* b+ @' I1 l4 z; n7 X* D+ V* T
to setup-turtles
# t0 x9 f# K0 a9 ` create-turtles 100
. J: m; y! @) l1 C8 r' m ask turtles [ setxy random-xcor random-ycor ]; K+ S3 L2 ~7 f0 N
end
; G9 [2 Q$ J, ~, ito eat-grass) V" x- S5 O, b, A8 F) [
ask turtles [
! {2 q* d/ o$ D- H if pcolor = green [
4 R% o/ J% E; h# n set pcolor black
; v q# b- i" q5 { set energy (energy + 10)! {9 R6 W( X* C* X' z
]0 k6 [ f) l0 h9 u1 T+ U) D
ifelse show-energy?
; O) t0 i: R. ?! ?& r [ set label energy ]
/ e: R8 f# f! M [ set label "" ]4 \6 L$ d9 `; s9 k! i+ i
]- v4 w5 \% \' b2 o$ M' ?
end5 ~) Q# b: Q# S, y
to reproduce O g- g2 H z% F
ask turtles [
$ |% f0 e) c( o3 Y5 l: B( d$ s4 h. [ if energy > 50 [; f3 I4 K D* [9 b1 H
set energy energy - 50
2 W: {, d9 I* y hatch 1 [ set energy 50 ]" j" P( }0 G* `2 @3 D
]
8 W9 V0 N- S% j# g Q; V ]# y Z F# c+ Q b( }! c
end- R7 m q& \$ I8 A; q
to check-death K8 \1 j2 b9 ^9 \' e0 X
ask turtles [
0 W$ w( A7 e }7 ]; e0 ^* C if energy <= 0 [ die ]/ N2 `8 R* s/ V9 v/ ^. R
]
$ P" l" K: ~$ p3 r9 ]end
, T' R( D ~. p: l& Z7 ]' sto regrow-grass
2 A! R* X7 A8 M ask patches [$ Z3 o+ p! O: i/ x/ L" _
if random 100 < 3 [ set pcolor green ]; f2 s5 j, D! a' I u/ {
]" s5 N, ~+ u) n2 x7 r
end
4 I5 d4 ]" r$ C. K" ^/ `to do-plots$ O5 l- v$ c8 ~1 b
set-current-plot "Totals"$ W" h2 F7 Q* ?
set-current-plot-pen "turtles"
3 g2 R% e- l# h& L5 H/ _$ A- l plot count turtles
9 [% @' N' X/ l0 O1 v9 Z set-current-plot-pen "grass"
, i) }# ^+ z2 \" h/ N- [ plot count patches with [pcolor = green]
/ F6 ~8 }; N& O! l, E, Tend+ h( f, e1 b7 u8 h1 r9 G1 B7 s
可是运行时提示no such plot: "Totals"
9 Q$ q5 G+ Z5 D" [error while observer running SET-CURRENT-PLOT( P5 U1 ]- P- J
called by procedure DO-PLOTS" B: M8 x5 r. d5 k2 L5 m! q
called by procedure SETUP
# X0 M6 V( i2 {! e; G& g3 u. `. F! b called by 按钮 'setup'9 e" N1 E$ Y8 D+ y
求大神解答啊 |