我编的程序如下turtles-own [energy]
. |* x* N9 M, O' ^; @to setup
. [6 I9 o- Y5 }3 t2 O3 h clear-all0 n9 a5 ?8 r6 y( f, S3 v# G$ S/ ?
setup-patches
5 x, m/ B( l! T1 ?9 k create-turtles 100
$ h$ q. k3 N2 s% Y6 q. ~' X do-plots- e, W2 x$ _2 Z* L
ask turtles [ setxy random-xcor random-ycor ]
4 T! @- c- ^8 {0 o: nend
( B: c/ q1 i) dto go
+ O. p/ O1 @& w move-turtles
. Y! P6 f. b9 }7 H eat-grass9 _* e- `% A8 ]0 A+ u$ h( g
reproduce- N% Z8 X8 t% Y
check-death; s3 F( Z3 X7 ?& x$ d
regrow-grass3 n) A A$ z. b' w; o
do-plots' L7 S7 E8 M! g/ q' X6 ^4 X
end- ^% L1 y" N! r) V. ]- S# g1 N/ [ c
to move-turtles$ T: Q; W7 T4 L$ ^: W: H3 F
ask turtles [8 ^4 Z& d( n% f( {& d
right random 3601 v' f: w: }6 a) z1 p, a; L' L
forward 1$ e z1 T* G- R( G$ u
set energy energy - 1
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end7 y% V, E R' g/ q% M5 W+ V7 @
to setup-patches
5 ?9 F K3 q8 `# G ask patches [ set pcolor green ]
7 O3 |3 ~ r, s5 k8 g7 kend
: T9 Y0 k% f. x1 R# Jto setup-turtles' Q9 A! y" O8 O _. I! Q; U
create-turtles 100
# d$ l6 n9 ^4 ~" o/ _) M ask turtles [ setxy random-xcor random-ycor ]
' C( ]. S5 ^$ H Q' D" @4 |; wend
0 w" W) ]* Y' A) f; |to eat-grass
! x2 g$ g8 g* q ask turtles [
' e" E" t) b3 _; |. O8 F0 R if pcolor = green [9 O0 L) @7 Z; }$ ^& A& Z
set pcolor black8 d m/ N9 a( s0 p4 f2 j( e
set energy (energy + 10)
" U# B# ]7 {( H ]0 Z& ?4 n% q$ r) }+ s$ L5 E
ifelse show-energy?
0 @3 H4 l% s; u0 j# w: U9 g5 k( P% o [ set label energy ]; E b* h2 Y6 _
[ set label "" ]0 d5 [& |$ D5 i
]0 K' X. v8 f- z H0 P- R! K* l, d6 O& y
end P: z ?# ^' Y o$ c0 }, R
to reproduce
" ~( A I9 Y& M" [ ask turtles [" B) `6 e6 ~3 k- O; }
if energy > 50 [
" B: S2 _% Q- h* r set energy energy - 50
M! v ~1 j! R* {: ]; N hatch 1 [ set energy 50 ]! o6 J- x) i/ S' A' `( s# ~
]
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end. W; D- e, e- J3 Y# g2 @8 d
to check-death3 H7 `. P8 x3 {% ~
ask turtles [7 z. n* G4 u+ J( Y9 G& ]; w
if energy <= 0 [ die ]# T! N4 e) j/ {2 p( i! x z
]
- k% u& n4 [3 [6 Jend. Q* A! L5 g3 F4 p1 [0 P
to regrow-grass( N+ ?9 I+ \* w' w2 k5 h8 Y* g
ask patches [5 ~) \3 D; c( J7 H+ \7 \0 n% j
if random 100 < 3 [ set pcolor green ]
& G/ i2 R2 t1 P) ?+ K F ]: w' J8 g6 W; T, O; L4 D
end
7 E3 X( R$ R; x7 S4 R! {, `to do-plots+ ~& t8 a4 Z1 i
set-current-plot "Totals"0 N r6 u/ Z) ~- V# x) f
set-current-plot-pen "turtles"2 ]/ k2 n, d7 S) i7 e/ a
plot count turtles
* h* }2 O. p) p0 r+ R- e q4 K set-current-plot-pen "grass"
& k. e+ B/ C! A6 W* d; ]1 ~" } plot count patches with [pcolor = green]' U" t$ M; V, V3 @9 m3 Y3 F
end8 w H/ a |, k
可是运行时提示no such plot: "Totals"$ g2 O- o: k/ [" W& @# k( b9 d) k& n
error while observer running SET-CURRENT-PLOT
6 }& h; a9 r: z7 K \ called by procedure DO-PLOTS
, l$ S9 c+ q& A% F& ]" u called by procedure SETUP0 q: s" w6 r# l4 ]( D9 r: e: ]6 Y
called by 按钮 'setup'' \0 K; O+ i' B4 t9 [5 A
求大神解答啊 |