我编的程序如下turtles-own [energy]
# e4 X; x; [4 F5 \- H3 T8 sto setup
5 g; y/ `- c# @2 d( Z% b5 t clear-all
/ U3 s- Z+ ~; N4 V setup-patches
8 g, L1 k& @( i create-turtles 100
/ i+ @5 M: A% m; u& ~& G do-plots
* J6 V. H' d7 F+ @! V$ q, Y ask turtles [ setxy random-xcor random-ycor ]
9 p+ G' v" `+ s2 n) T, Gend
" s& P2 z9 G7 p, o& _2 vto go4 m+ C$ q/ r1 K0 u. H H. U G! [
move-turtles2 ^2 C. Q0 X/ a% H# \) _
eat-grass
3 j+ n4 J# A, Y% j1 V) N( l reproduce, ~: i1 S U% ~! C
check-death( U. a2 s8 |, f, j3 j; h
regrow-grass# ^3 z( e h$ L* q4 C
do-plots. n: [: Y Z& W9 f+ t
end9 {4 \. {, V1 ~0 j4 h' R' A9 @
to move-turtles
% `+ k7 M. _) Z" Z ask turtles [
0 k% g$ F) P0 |" K right random 3607 s7 _2 {& l" u8 f, O, C2 e
forward 1
" x) @/ G4 _$ r7 {- f! b" [, m% R set energy energy - 1
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end& S8 y+ @3 R4 d) P
to setup-patches
j0 L7 ?( R& K( q% b5 K ask patches [ set pcolor green ]5 T$ @! B0 ~5 N4 i. f1 L
end
/ X- J) x' Q( p0 ^6 J6 uto setup-turtles0 k' N" J+ O5 M. Z7 E
create-turtles 100
% _9 N+ Q5 ^! j9 V. q2 g' M ask turtles [ setxy random-xcor random-ycor ]
9 I+ x9 c0 ~/ }1 h& Jend
: ~: f9 w x9 k) K8 {, O( Zto eat-grass
. k6 D {# h5 R. w+ l7 A ask turtles [% v, r9 L$ a" ?& r
if pcolor = green [
' j3 X4 D' }& |, L, ? set pcolor black
% g* l* f( S! p6 h0 Z' I set energy (energy + 10)2 r# }- ^$ K0 @* t
]! {* O7 ^8 F6 m' M, F* T2 f( }" U
ifelse show-energy?$ D( G e" s5 C- M
[ set label energy ]
y5 l) D+ Y C$ F* S* i [ set label "" ]4 L! H/ Q! s! h" n5 i" e3 @* E0 R; [
]
5 C- E7 \" I$ b$ b' nend" M( Z! w6 z" N5 w" Z
to reproduce
# A+ \, R3 x# }4 [ ask turtles [
' D1 _" K% j# @& d* o! }8 h if energy > 50 [3 y) q8 d% L* ?9 H& m( d' n! u9 ~5 v
set energy energy - 50, z4 }0 u, ?# N, B9 E$ ^* i
hatch 1 [ set energy 50 ]
1 c4 C$ e; U# O2 j8 @' v0 O% A. O, _ ]
. j: f0 p. ]- x) ]6 o7 e" Z ]7 g! n9 a' P5 G/ C9 W: y2 A
end
4 r" C2 u* r# Wto check-death1 `0 H& h* X, I4 U
ask turtles [
5 J% `2 f' k3 Y3 Q+ M' Y2 @ if energy <= 0 [ die ]
& u2 V; y/ q( e ]9 d* H. z) y4 `
end8 f5 V( s0 x+ e4 n6 l& A' L; d
to regrow-grass
6 `6 p- O* e" X% f& ] ask patches [
( f' m2 d+ S$ w6 O8 R3 E8 V7 B% T/ } if random 100 < 3 [ set pcolor green ]9 C% }# K: t6 e3 t c
]$ T, ]6 W, _6 V4 Q; k
end
6 ]# u+ u8 ~) `9 q' xto do-plots4 G' N: G' r8 I( @$ N- Y: r
set-current-plot "Totals"
1 Z' w. m k! G& v0 I" C9 r1 w, j set-current-plot-pen "turtles"% J3 B! @. u5 U# ]$ M2 r
plot count turtles
3 f( ^0 _# {* B& I6 ~7 C set-current-plot-pen "grass"' |( @- S) q& [$ f& G
plot count patches with [pcolor = green]$ g$ o" A/ I( M# b8 r6 S" M
end
6 O$ S* O* g) U: m9 E) E可是运行时提示no such plot: "Totals") k$ }3 m( R, s: a+ `" b4 C9 p
error while observer running SET-CURRENT-PLOT) U5 D$ t7 m& m: k3 L& ]
called by procedure DO-PLOTS- a e N! N' B- s- |4 z4 K
called by procedure SETUP
7 X4 u: N3 U% s2 |$ L' c: J called by 按钮 'setup'' d& F7 ^9 V' F _% W/ Y
求大神解答啊 |