我编的程序如下turtles-own [energy]
& D. M3 I2 j! c0 ^to setup
: |* Z/ Y1 K) k5 S: e clear-all8 Z% F" [; \, z: ~8 l
setup-patches
5 d2 I y9 R1 Y6 G& L8 E% T create-turtles 100" o! [) o! ? V8 q6 o6 L/ R
do-plots
5 \0 K c0 p0 k+ ^+ Y, X ask turtles [ setxy random-xcor random-ycor ]
4 ?. L, b9 W$ p+ ?' E8 Nend
/ [/ ^0 J& m# N1 o" L$ f& oto go& s2 X8 i8 W1 [
move-turtles. D2 Y9 \5 f& p" ^
eat-grass) C+ t5 d- E }: G' m
reproduce. ~; a- ^8 x5 ^2 a' G
check-death( P% S8 s$ S) b
regrow-grass
4 R1 ?) W4 r/ D6 y, i, \1 C( d do-plots1 v# H3 O! P4 |1 y5 I% Z9 _
end/ [* `$ I3 l4 T
to move-turtles$ g8 w- `2 k" X L/ ?1 u; H
ask turtles [3 @! [2 A6 U3 M
right random 360- D" `, s5 [; q1 P) `
forward 1
2 T e# K+ s! Q6 z set energy energy - 1
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end
4 ^: X4 ^$ Y) {/ \5 o6 U( pto setup-patches
+ q" K0 Y7 `( Y. E2 A$ Q ask patches [ set pcolor green ]
* W: S' A* A n- Jend+ o a5 T$ v" Q8 D0 S6 }, U5 q# u
to setup-turtles- \5 R" q! Q9 O' W) c
create-turtles 100# V. a+ |. ? ^, O: c
ask turtles [ setxy random-xcor random-ycor ]; n% I: U) p' K2 Z8 M8 G( m2 R
end, k& k7 H- d7 w7 A
to eat-grass; L- o! i! }1 }$ B9 j; y8 ? x
ask turtles [! J( p; i$ U1 i7 R% w' }
if pcolor = green [+ k* u9 y- N: {* C5 y
set pcolor black
/ r6 f$ `" a' O set energy (energy + 10), P* y1 P6 U4 `- ?
]
+ r. u! o- j; F* V8 d2 O9 x3 D% w& ? ifelse show-energy?
2 G3 s8 M- t2 ~' i- x+ A$ P+ U [ set label energy ]
/ P+ y S$ y/ m7 }5 z [ set label "" ]
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end% q! C1 z# O" c; X; E1 o. |
to reproduce1 b: B0 X1 V! l5 q
ask turtles [: g9 R q8 r2 `$ Y4 p( z9 V
if energy > 50 [
# p% Z. U6 F( ~- O$ K/ d, u set energy energy - 50
4 ^0 Q7 j/ k4 }1 j+ V hatch 1 [ set energy 50 ]
" R" S$ U, u; j6 [2 q) J ]
& s% O* q1 b$ k" d ]
0 u; [ R! N3 M0 Dend
3 \5 S; `: v+ X# Q5 Z# x7 rto check-death
) Q6 x$ Q C' D( b ask turtles [
5 J% ~" s2 l+ s/ ^" o4 k if energy <= 0 [ die ]
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end
; Y3 G# F. r; b% Y1 w1 hto regrow-grass" |+ j z0 _$ {
ask patches [
0 y$ Y$ `3 C, j! V5 u if random 100 < 3 [ set pcolor green ]: J3 |4 @3 h+ J1 B$ U
]$ f: E! o5 \3 Y% a) Y: t+ R
end& P, n/ B' y: i7 s8 ?- x- N
to do-plots' a# S' i! B7 w( |$ X
set-current-plot "Totals"* J) R5 ?, d1 {% Z8 G
set-current-plot-pen "turtles") q& W$ t4 t _
plot count turtles; d6 c# W: Z' _& Z* |
set-current-plot-pen "grass". u& e! U: M8 Z! [% S6 l* K7 `
plot count patches with [pcolor = green]' z9 ~* q; c) d: W: ^: O* d
end- {" P) M s0 A4 D3 a
可是运行时提示no such plot: "Totals"7 {( |/ ?% x& N0 y: {# U B9 D
error while observer running SET-CURRENT-PLOT
2 k) G% D2 E: g7 l called by procedure DO-PLOTS: a, F% m, m8 ?) b
called by procedure SETUP8 J9 ?9 Y; k3 g4 G' t5 F
called by 按钮 'setup'" C' }6 k5 |1 X) Q
求大神解答啊 |