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[求助] 在看例子时有几个问题看不懂

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发表于 2012-6-20 08:59:43 | 显示全部楼层 |阅读模式
新手,在看netlogo自带的例子时,有几行程序看不懂,希望高手能够指点。
* \5 l& o  ]! F6 O* Enetlogo自带的social science--traffic grid这一例子当中,
7 }( k% [5 U% T& X7 _  Wglobals& d% I0 a' j7 ~+ P: V( R
[3 s. P5 K* a7 O7 T* d
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
0 y5 S5 q/ p7 p  grid-y-inc               ;; the amount of patches in between two roads in the y direction
# h- t7 u* r5 o1 a8 ]  acceleration             ;; the constant that controls how much a car speeds up or slows down by if( i! E' |' E, [2 B( C' t
                           ;; it is to accelerate or decelerate
3 O  C+ F8 d- b- p, B  phase                    ;; keeps track of the phase
8 Y; ]$ F7 W, i: D* |  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure1 Y8 I- y; G7 c3 {5 [
  current-light            ;; the currently selected light
/ g% K1 r7 a3 H* W. [+ m
8 e4 U* ?5 |, ~, {, H' _  ;; patch agentsets
' \- Q% h5 w1 Y! z( O, N7 G  intersections ;; agentset containing the patches that are intersections, K5 }, Z2 t  X5 ~5 W3 {
  roads         ;; agentset containing the patches that are roads) r7 M( f; K7 \/ b1 V, ~& _
]
0 O" {: F( A- T: m& |
8 y  B' N9 N! d) C0 C( k/ X; k2 cturtles-own+ Y7 i& a/ ^; r+ @7 C
[
4 b( W1 k) b2 {" c& d  speed     ;; the speed of the turtle& T: Z2 e6 }, j4 [
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right: b+ f( f! H; G/ ^0 G: }; z
  wait-time ;; the amount of time since the last time a turtle has moved, A+ Q8 E' H& c- K
]
* ~0 V" Y# q! E2 o  g) N  a
/ h! C$ v( \. k8 Cpatches-own
/ h& S8 F  X5 }, k" I[
3 H) W. s" ^8 J0 Y4 R' B( ]  intersection?   ;; true if the patch is at the intersection of two roads' a, Y1 N; w# y9 h
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
4 Y/ {+ G2 R  F! {; n                  ;; false for a non-intersection patches.
4 P$ P! r; Q" d7 {* ^  my-row          ;; the row of the intersection counting from the upper left corner of the% K  H, _7 h4 w9 u  R1 M$ J
                  ;; world.  -1 for non-intersection patches.% r4 k! {7 h5 [- e8 T
  my-column       ;; the column of the intersection counting from the upper left corner of the( Y, i3 ?) T' p( k$ `( z
                  ;; world.  -1 for non-intersection patches.* b- n1 f! I5 D$ R, [
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.; Q; z" a* J9 D" c1 ]7 p- ^
  auto?           ;; whether or not this intersection will switch automatically.3 G) y9 Y- t  s2 T5 i! s# c
                  ;; false for non-intersection patches.
# @" ~6 @/ Y9 E+ @6 Z5 m]8 X+ a5 U9 m/ _( V

/ S, t7 P- Z7 d8 E/ ]& t5 Q- m- k% b* g3 ~  L: b
;;;;;;;;;;;;;;;;;;;;;;+ u$ B' N$ s: L( L" S: {: T* I
;; Setup Procedures ;;
* {! g% U* l9 y3 f) \;;;;;;;;;;;;;;;;;;;;;;+ i" Q+ H/ `5 G' U8 S

) j  ]5 F7 l1 F; x% {5 }+ j;; Initialize the display by giving the global and patch variables initial values.
4 M9 [/ [& H+ B2 };; Create num-cars of turtles if there are enough road patches for one turtle to) C* ^7 ]: ?. `8 G
;; be created per road patch. Set up the plots.
: \# Q: W, O9 g$ v4 q6 m; hto setup
+ p$ E& P% y+ }% P9 R: u' O# M+ ^5 @  ca
5 h. m" f4 T" L  setup-globals4 E5 U5 x9 q0 k9 H

) v# T: H, E5 o* C. E% u  ;; First we ask the patches to draw themselves and set up a few variables
# A0 g5 ?  v0 x) `9 M3 \5 ~  setup-patches! E' W* k6 j1 n- _& b$ k5 [1 B' k
  make-current one-of intersections
: q! P' }5 X% I6 r- A  label-current* M: @. A/ X4 F; {  n5 H9 @

. J" ~" `4 e  o/ `  set-default-shape turtles "car"# ]7 Z! W9 `' Z+ l

" L. G# Q9 N9 H9 |' p  if (num-cars > count roads)+ {) w' K! S. z6 p) M# h# j" w
  [9 V* U7 v4 A6 U
    user-message (word "There are too many cars for the amount of "2 b( L6 G# a. V% W; I
                       "road.  Either increase the amount of roads ": Y: j/ h! s( e- i, ~; p. z/ O
                       "by increasing the GRID-SIZE-X or "
" k7 o/ a% k$ a  J8 N/ A/ s9 ?3 ?4 n                       "GRID-SIZE-Y sliders, or decrease the "
2 q& I/ d& I1 ~9 b1 o+ X, |& U& n                       "number of cars by lowering the NUMBER slider.\n"
3 f2 M. a! p7 P( b) n7 ^& p                       "The setup has stopped.")2 B& I6 x- C" t# ]* q
    stop- I& a4 D" c$ G/ H& J& k. f4 A& z
  ]4 \' w8 n0 u4 J; `( u4 B" V

0 S" \0 q3 d* K( Z7 V$ z  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
6 P1 L1 l) Y3 i4 Z- s7 _' N! o: d7 I  crt num-cars  I& t7 p- N& |% f" |1 \1 c
  [
  d- F, e: j( }/ n8 F( p" ?    setup-cars
5 A: E. [4 B1 Z    set-car-color
4 b( [( z0 s' \    record-data/ i( P  Y) Z/ I+ x! V: Y; m
  ]: V4 y4 A- _( N' t3 a
- M; Y% {9 z6 V# n& M- c
  ;; give the turtles an initial speed) c0 [9 [4 F) Y; C! g4 d
  ask turtles [ set-car-speed ]
" n1 Q1 i+ v! i/ B
/ P1 K" P) b+ H* e8 L# b  reset-ticks: |# z. H6 c7 ~6 k9 j8 [. C
end
! ]* C7 D4 }7 p! g! {0 {) n9 a8 r5 B& j( a! V' m
;; Initialize the global variables to appropriate values) e0 n; a5 y) @8 ]0 @$ T9 }& u) ~
to setup-globals9 K4 y" _% \- y+ @; e5 ~
  set current-light nobody ;; just for now, since there are no lights yet2 S$ x- h5 C% e' V( V% j- P
  set phase 0
: z) x- c  \7 e3 X8 {8 f, d  set num-cars-stopped 0" A: Q5 d' k4 A9 i* t9 ^
  set grid-x-inc world-width / grid-size-x
8 E0 G8 Z( N9 d* }& F3 z  set grid-y-inc world-height / grid-size-y4 X3 P- [( P7 m( q8 Q

! _$ S6 e, |. z. U% K. F; z  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary$ n9 g7 {7 W9 A4 m' C
  set acceleration 0.099) |" B% }- d4 a2 ?* S8 ], @8 N4 }6 R
end2 o) o" D/ V/ B  k; @5 v

+ ^# }% j  K0 m;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
1 q& u1 s# W. d* |0 V1 _2 F;; and initialize the traffic lights to one setting
) h# S% `% O6 V( |to setup-patches
: ^9 |) b- W( D* M- O  ;; initialize the patch-owned variables and color the patches to a base-color
% K- G2 r5 G! R+ A  ask patches$ x. I2 }2 S( K
  [3 ]7 J2 ~8 e) d. f! X
    set intersection? false
" Q: N$ ~7 q# N0 A4 u# f    set auto? false* ^1 O1 S; W4 f5 i8 _1 R! Z9 {% S4 J6 j
    set green-light-up? true
2 s0 A, J  g2 Q- ~% D, ~    set my-row -13 ]: @, \1 Z2 W! U3 c. }
    set my-column -1
" z! G; B6 X4 M) f: Z9 r9 b    set my-phase -14 [( a( U* G) h, [4 g' }! O
    set pcolor brown + 3- D& F4 c+ `  ]& W. A
  ]
" _' _% F) o$ c6 I# ^8 V' N6 n  k4 |" z% n
  ;; initialize the global variables that hold patch agentsets4 u$ U1 T* j1 p2 [1 X
  set roads patches with
% H, \1 _- Y; y6 o5 _    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
( \+ @& C+ Y; K+ c# J    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]' Z, z0 t! I# W; T! d
  set intersections roads with, ^: v5 t* p, b: K# ~! {$ @
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
( x5 i1 t% _# B0 x* R    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]4 ?4 p0 w' V2 E! B7 u

# x. }) X& x: H  l  V6 M  ask roads [ set pcolor white ]+ l1 }* O3 N( I# @8 Y, G( k" [
    setup-intersections
# z* s5 G3 ?% [9 B! Oend
0 m, e: e8 L- F2 u& t! I其中定义道路的句子,如下所示,是什么意思啊?. C. @! j1 |8 x  r& x; F" H
set roads patches with
$ A2 ^5 T- r! Q+ C+ Z; J4 b' N    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
7 p4 ^( S3 e8 @0 D3 v+ D& `7 n    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]- b$ Z( [# b3 M' T: i% H; f
谁能帮我解释一下[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0)是什么意思吗?
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