我编的程序如下turtles-own [energy]
! Y) g& T. F9 `6 [+ S Qto setup
! t& V0 W/ O2 `4 O clear-all" t5 ~( P2 p% x; g
setup-patches% n% r% i5 ]& v8 o6 @/ i
create-turtles 100
! R( A' G) T) M0 c7 k4 U& m2 I; T do-plots
9 T2 O: L. V- f) Y4 h9 l% { ask turtles [ setxy random-xcor random-ycor ]
/ w% ]' z# ^5 P2 B3 _9 k8 Aend
. q! Y% s( \, T6 K$ [, qto go
6 X3 b% }' d% F) q move-turtles
: ^7 N/ z* y8 B% L$ @1 r eat-grass
3 ~6 j6 |( Q! E% L reproduce
* f- w* o* U+ K+ p% o7 T check-death
* a1 Z6 |" Y- g& R regrow-grass
- C& G- q% z/ Z# e& _ do-plots* U) a1 r$ ` s5 i+ T! b
end. s( d: z; ?3 B
to move-turtles
, Y# a' R* i/ c0 _3 e ask turtles [
# | V- S& U) J" a) U4 V right random 3608 x1 d1 L; Z8 Q' ` E7 R* |
forward 1
( a" R6 p5 R2 s set energy energy - 1, G3 c: n- `" ^$ Y, H. {5 o
]
) n8 ~ M* J0 rend" z2 U L! x+ Z9 q- _7 u* k
to setup-patches
2 h, |: F7 `, {+ y" u ask patches [ set pcolor green ]
1 }4 k- O! X5 o: W8 M) Xend
, m5 X! k9 p2 _' Z( b8 n. H& [# @to setup-turtles: I3 k! Q0 I' J* D& N$ }
create-turtles 100
% `4 l) `. C% D' }; u2 Q8 S ask turtles [ setxy random-xcor random-ycor ]
. P; l" b, M; ]end* w% f2 ?0 u( v0 V! j
to eat-grass
! T. V* J1 I/ z3 {5 f0 n" c+ t4 L ask turtles [8 q( ]$ B2 N" Z! P3 B
if pcolor = green [
9 j1 g! _6 X2 ?9 @7 F$ s! U set pcolor black3 m$ Q1 C1 I2 d: w7 V% B L5 b1 y
set energy (energy + 10)
# r: `+ e/ v/ q9 G# p ]# }, x- X1 r' t# T$ p6 @
ifelse show-energy?
! S* \3 @; q0 `: F3 l [ set label energy ]
9 }: S1 h& U7 A! w [ set label "" ]
% S, w: m! Z5 u/ Q( W: z7 H/ S ]
9 M) E% v; L) l0 g- Pend& r. v, r6 M, E9 f; P# Q; |2 M$ y0 a
to reproduce9 @4 g# N! X7 q* q6 y F" R1 L( M
ask turtles [
% I2 W& P9 |) l) E( [" E if energy > 50 [" i! w+ A! R( N L9 o5 A
set energy energy - 50+ I* j" j; X4 _* l6 M# p* M
hatch 1 [ set energy 50 ]
$ Z- W$ I6 w. L0 i. k ]
4 X7 U# ^' f# b ]: H" t+ _! {8 u1 z
end
3 A9 l( C4 P& h' i+ f1 D. Xto check-death% |$ g/ X' n% G# x6 `% r
ask turtles [: Y. }2 `- B3 k I. z
if energy <= 0 [ die ]- H! Q$ J2 u+ V3 U9 u
]
- }; s: J$ c8 ~5 I8 ]% \1 [end0 L' C# G* d! O, H( M2 A0 b
to regrow-grass
; m$ @0 G9 b3 |5 L* m& T ask patches [* v( ]9 [( ]2 _# ~) H
if random 100 < 3 [ set pcolor green ]4 u; J3 H. m# n. \- h
]6 Y+ \* ?$ H- A F
end4 v& J% z) ~& v1 `8 ]+ f
to do-plots
8 g1 _! Y2 B+ u" E set-current-plot "Totals"
$ ]. T; I6 H; ^4 s0 U7 [; k7 U set-current-plot-pen "turtles"! j3 `* s. v# R2 w' Y
plot count turtles
( `$ [4 M& v2 O2 S- c. r set-current-plot-pen "grass"
2 `- R0 {" B: u$ Z: G1 F plot count patches with [pcolor = green]6 M( G! b8 y5 y- D
end+ O: D$ S- H: b. ^0 A, Q
可是运行时提示no such plot: "Totals"/ C4 a2 [4 v* Y/ S7 V! ]' e, {0 P
error while observer running SET-CURRENT-PLOT
; M' k8 a$ M- P2 Z# _% a called by procedure DO-PLOTS
W* L6 }* p o8 ` called by procedure SETUP6 _: m% j4 t6 ?4 E0 [0 m! j% F
called by 按钮 'setup'
, b. R- H3 I/ f/ c3 P- o求大神解答啊 |