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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。
* N. p* k  ~% `4 Inetlogo自带的social science--traffic grid这一例子当中,
( O, ]' q5 U- C  S% {: eglobals
- V0 Q1 A. \( p[( X. U9 U' z! O- B( A5 c. }
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
6 ]9 @/ n$ i6 ?# ?( @  grid-y-inc               ;; the amount of patches in between two roads in the y direction( e5 h; T, p5 E  d( H, s. H
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
* T* @  \" x( t% l4 i' t                           ;; it is to accelerate or decelerate6 t. o- c( i& @4 M: o" ]8 q9 ~- R
  phase                    ;; keeps track of the phase9 {% H8 |/ v. v1 n7 {0 W6 t. o4 u
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure2 P2 s& R# S1 e2 n
  current-light            ;; the currently selected light
" I  z6 O( ~7 A; d" @3 Z6 `6 Z7 H/ z: j
  ;; patch agentsets
" Z% o: s1 [9 D3 U  intersections ;; agentset containing the patches that are intersections
. B7 E( A) W7 x" L( ~7 n  roads         ;; agentset containing the patches that are roads& p6 H# {6 o1 H& n1 B
]
4 V' I' n( [; V: T) l
4 m7 ]! P2 N2 ^) l$ dturtles-own
: u7 p3 H5 f. T$ [& N8 o[+ @) I8 m+ r% C, j  D
  speed     ;; the speed of the turtle  V, |- V, [* e9 \
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
3 P4 _3 T* o7 ], e5 s1 z  wait-time ;; the amount of time since the last time a turtle has moved$ H. l  L1 m6 ]# y; Z/ F) K
]3 X0 P2 v% Y$ E

) G/ r, D/ ~8 jpatches-own5 j: H/ T! r+ Y* W! p2 E# q% |
[: D* _# l6 K5 C. V7 H2 r) H
  intersection?   ;; true if the patch is at the intersection of two roads
) N( u3 y7 q" Z$ m% H' v  d  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.# E3 E: b0 Y, S- {; W# ~3 S
                  ;; false for a non-intersection patches.
/ Y; s( D: Z+ }( ?3 L/ U$ Z# v* e- c  my-row          ;; the row of the intersection counting from the upper left corner of the
" J6 J! x3 Q4 _3 M/ x; l/ v                  ;; world.  -1 for non-intersection patches.9 R, L5 w( ^2 W6 K, ?- H
  my-column       ;; the column of the intersection counting from the upper left corner of the
0 O/ E4 c  L. f5 @9 ]$ P2 }                  ;; world.  -1 for non-intersection patches.5 |  l5 K$ P8 c
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
& E1 w+ `+ Z) r( Z; X  auto?           ;; whether or not this intersection will switch automatically.
2 z4 m# q. R3 Y% b9 y1 U% `/ V                  ;; false for non-intersection patches.: A+ E/ J  j3 {
]& F: S* O: }$ B  [, y: y

" n1 Y2 r) D' V, s: }) `- b% o/ K8 G2 n1 z9 d
;;;;;;;;;;;;;;;;;;;;;;1 L3 }4 t0 R/ k. [8 W* ?% D5 D
;; Setup Procedures ;;8 ~/ @( Q: q" j2 L9 j& _% I3 q
;;;;;;;;;;;;;;;;;;;;;;
2 y9 y9 {$ N3 s, q" R  N* X6 `. [- `+ j" j7 y( R
;; Initialize the display by giving the global and patch variables initial values.) [- n6 E& B5 O, ?  ?8 S4 U
;; Create num-cars of turtles if there are enough road patches for one turtle to
2 X: r2 O7 {$ m6 m7 @;; be created per road patch. Set up the plots.. I; j' E% L8 C' v; p+ f' ?; M
to setup) b  e9 M8 F6 K$ K
  ca  a# _$ e0 }8 {' C. Y
  setup-globals
" g$ Z  e/ Y- W4 M9 B  Z# q3 U; {0 p
  ;; First we ask the patches to draw themselves and set up a few variables
4 }) H3 |( J' z! @; E+ n' l6 \  setup-patches
5 f& {$ s4 m% `0 N" X  }  make-current one-of intersections
& {+ O# O6 o9 |7 ?# c- S  label-current" F' s/ y4 L6 D, Q

3 l: q( l% B5 r  set-default-shape turtles "car"* T& W) j* V, F- v0 |, ]# g
: T) q, B4 O- b3 a# E3 I# {8 O  a# c
  if (num-cars > count roads)
( B% h: k) {( g: d$ [  [
1 ]! [, F5 U  X, y& c( i6 T    user-message (word "There are too many cars for the amount of "- z7 K+ ?4 d% p: G( ^7 u8 R& `1 j3 G6 M
                       "road.  Either increase the amount of roads "
. X. M6 Z$ E( E- {2 \( s                       "by increasing the GRID-SIZE-X or "' V. k1 H! w! W+ j
                       "GRID-SIZE-Y sliders, or decrease the "% X# [5 a5 j7 ~
                       "number of cars by lowering the NUMBER slider.\n"0 Z7 \" y$ `( X% B4 f: g7 b  U
                       "The setup has stopped.")
9 t) A, J1 [( j' O  d" }. k    stop
9 B3 c; `; H3 G3 w4 {5 K  ]: p5 y# Q7 w6 j7 L  ?
2 t; t+ r. B4 a% k, J
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color1 y4 i3 O! c; [5 [! \& N; H4 P
  crt num-cars
3 s" h; t" N$ L5 C2 e  y( p  [
6 F5 r$ N# E8 a    setup-cars
. S% j+ ?4 i( ^& T5 v( S2 k    set-car-color
/ j% U+ }4 ?& E4 R8 F    record-data& h+ B6 c3 q% o$ I# {6 `5 \
  ]+ b  l. H, A3 R3 O1 c

1 h3 Z) l  S. R5 d- k  ;; give the turtles an initial speed
  ]+ I+ C  K, l9 j! ?! b1 y" q+ J  ask turtles [ set-car-speed ]
+ t9 G% A. \0 v3 w; R
# v9 l5 J6 x' G7 y3 P) ~' w0 H  reset-ticks
7 X% ?& p- i# S! ^: _8 }6 bend* s& p# j3 ^. m* H, T+ p

9 k( D: R2 F8 c7 j7 z;; Initialize the global variables to appropriate values
! L8 j% I8 M, Tto setup-globals
/ g% R# a& e& D+ g: u9 j; {$ ?  set current-light nobody ;; just for now, since there are no lights yet
- o! D7 |: `/ b( E  set phase 0
) |1 Y4 F6 c' b* G  set num-cars-stopped 0, q8 B9 y. _* b
  set grid-x-inc world-width / grid-size-x6 a( p3 C* l4 I# g0 p; K& L
  set grid-y-inc world-height / grid-size-y
" c2 {8 S3 c. @
+ T: d7 e3 d) S  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary, l# u- S! |: R& Y$ P
  set acceleration 0.099
  i; Z8 v# X6 m# h4 fend- o7 D* j. B5 v& K" R1 Z

  P$ u) y  _9 H( \;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
7 n/ y* v& Z' R" \5 M) ^# l' q;; and initialize the traffic lights to one setting
, o3 r. [$ f! b3 Y2 y4 ^3 Fto setup-patches; s0 x) I$ Z6 P; d
  ;; initialize the patch-owned variables and color the patches to a base-color
( V4 N# `0 p, @  ask patches5 m1 F# ?- e& h5 }' r, q9 P, X3 u
  [0 @& ?% o5 f( B
    set intersection? false
9 W' ^, H/ h0 }- g/ c    set auto? false
8 V, M0 `, y/ O3 \! M    set green-light-up? true
$ n6 ]' {9 T" s, Q! j) T6 d) ~    set my-row -1
- w# @1 ?! v1 f; E) x  N    set my-column -1! v7 T! e. ?+ N& ]: o+ |1 [
    set my-phase -10 f8 s+ S7 C  d8 Q  {
    set pcolor brown + 3
* J/ D6 Y6 U9 v7 N  ]
* M+ h/ n" ^0 D% S: h0 i
: \+ q$ L, P4 a2 P( f! Z, R" e  ;; initialize the global variables that hold patch agentsets
- I4 y. S' N8 b5 t/ r6 Y/ Q' {  set roads patches with
6 }$ |& i* v! j2 i) S    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or" W( G: K1 M- {
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
& `8 r7 T/ R1 B) [" l& a  set intersections roads with
8 w- W- b8 R8 M* T; a" w4 p    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and3 Z( f7 s) H! x' M9 m; B3 V9 F* A
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]' r0 _0 Q: B! V; Q- H: f1 Z; J( h
9 _; W5 E0 T6 U: b. x; ?) B+ ]
  ask roads [ set pcolor white ]3 ~& b- ~% \; e' o0 u9 T$ y0 q6 {
    setup-intersections
% r. k4 k" C9 p. `3 M" `6 Vend. y; L" A: t7 w8 [
其中定义道路的句子,如下所示,是什么意思啊?
6 z" i  G# R% @, U3 i. W set roads patches with5 ?7 A- Z+ L1 U4 A/ S
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
6 |4 x1 P+ u/ g2 d' C  y    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]" p- E6 Q. b7 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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