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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。) z- ]& ]& e5 T$ j: H
netlogo自带的social science--traffic grid这一例子当中,9 G, i9 P% T" V' D; U8 Q, l
globals
* d+ H1 I6 g) K, |* y[
. j- V- c5 b% @  grid-x-inc               ;; the amount of patches in between two roads in the x direction2 E8 t$ v+ H1 L
  grid-y-inc               ;; the amount of patches in between two roads in the y direction% g/ q7 {$ y; \/ N( f* A3 i4 v
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if" O% z& s+ n  y) a0 N/ T5 Y
                           ;; it is to accelerate or decelerate
; T, h4 x) h* G+ o& w0 `+ W  phase                    ;; keeps track of the phase7 G6 g" o7 z. O, Y* v
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure) T* Y8 L4 I8 R0 C# x6 j  h
  current-light            ;; the currently selected light
8 d. r1 h% X8 Z/ p
; U' A3 B, E1 ?  N. Y/ _1 [1 K  ;; patch agentsets
* n: T4 I& E# ]3 |5 e. y8 M  intersections ;; agentset containing the patches that are intersections
) L  f/ P! I, ^% q3 u. G$ R4 L  roads         ;; agentset containing the patches that are roads
% g# E% m8 D+ W]
6 v) {/ f9 I1 t; U- G6 c1 t* r5 H! q2 ?6 O) }' D
turtles-own" I3 }! I5 I" S3 G2 x- c
[; L3 j! k. |9 v8 }& Z7 c9 t
  speed     ;; the speed of the turtle
+ w, |: n! J+ f2 m7 u6 r( r$ r  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
3 x& \3 r0 V! P% o& f6 }) R1 X  wait-time ;; the amount of time since the last time a turtle has moved
6 y. E1 c( L$ u0 M. G& X' |/ t7 l]
- t6 b% C* @. e9 V
  J- o; B0 a# f; f9 T0 K4 @patches-own, K$ x2 J( Q) w; t
[
$ d0 o7 n, z9 X  intersection?   ;; true if the patch is at the intersection of two roads4 S8 O  f0 ]/ [2 n- y' Y. P+ {6 z
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.) D1 C% i! |  m- H8 ~5 u# @
                  ;; false for a non-intersection patches.
7 `& m; ^0 m( e  h  my-row          ;; the row of the intersection counting from the upper left corner of the: a8 {8 v5 `; D- w" N9 N
                  ;; world.  -1 for non-intersection patches.0 n! C3 h& r# V; C$ p3 Z
  my-column       ;; the column of the intersection counting from the upper left corner of the
6 d2 \- e+ Q5 I+ f# J. T$ k# u                  ;; world.  -1 for non-intersection patches.
. z9 i4 ~% S. \+ E+ ^4 i  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
% p) \+ M' n  e  auto?           ;; whether or not this intersection will switch automatically.
6 j3 i# A% p/ F$ }+ Q+ Q                  ;; false for non-intersection patches.
; W% ?1 y1 i- X; p/ m: {]
3 B. o7 F% k6 {$ g/ ?; D. @, W) O
) ^4 M8 S- ?  q1 D+ X, e
7 g: J* E) V$ O1 G. o  c;;;;;;;;;;;;;;;;;;;;;;
0 A5 c' j; {, z/ j* O' f;; Setup Procedures ;;7 [6 D& I+ l( {( N; }5 s+ I
;;;;;;;;;;;;;;;;;;;;;;5 U, n  k# O; F# G& X8 p( s& g
5 P1 ?/ Y' e* O- `' X0 M, C
;; Initialize the display by giving the global and patch variables initial values.+ t/ ?& A, z9 E( M; |2 y  ]
;; Create num-cars of turtles if there are enough road patches for one turtle to+ j1 w7 H1 y# g) f3 I
;; be created per road patch. Set up the plots.
3 V) M4 r+ s9 H/ uto setup
5 c  }* m* m. v' U5 V  _  ca
' K2 G$ ~1 h9 r/ v; d3 m  setup-globals
  B3 O7 ]1 d5 Y3 A5 }6 b  @
- p6 c2 l4 n6 n5 S- U" |4 n8 \$ V- e  ;; First we ask the patches to draw themselves and set up a few variables
* d- W7 u& z# z: a  setup-patches# j8 J( v3 S- p# m9 k+ w
  make-current one-of intersections  `  ?. _) A- m4 S: J" @( E
  label-current
: a" p7 h2 h2 P% m8 k5 U2 m% t, `+ t* m, `
  set-default-shape turtles "car"( M* ~1 R5 E. ^5 e, D; P- s, W0 y
; S1 I2 J- H. }: `
  if (num-cars > count roads)/ W- v' N/ P! y+ p4 i8 R/ r" w
  [
3 L& J: X0 `# w3 I, a    user-message (word "There are too many cars for the amount of "
% w7 s1 L  N- z( z- l: J; c3 j                       "road.  Either increase the amount of roads "* {  }3 r* I/ Y/ x* d, b+ I; _
                       "by increasing the GRID-SIZE-X or "/ _4 F/ `. u0 E4 b+ a7 }' D+ @
                       "GRID-SIZE-Y sliders, or decrease the "2 L6 _4 k$ n2 _" E1 h
                       "number of cars by lowering the NUMBER slider.\n"0 g% o" m5 R; R# Z6 y. |
                       "The setup has stopped.")
, L" O& _1 w; U    stop! d9 R# x/ w# Z* i: _
  ], J& C( q4 d; `, S* t& ]
, |# o0 l& v" N1 |* t
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color! X+ w9 d5 c2 G6 b
  crt num-cars5 D  G9 \' X, t7 i2 J, C4 j/ D& C
  [7 k6 Y4 f* L! i8 }. Z$ U- @. N7 T
    setup-cars
9 Z8 v1 m7 b- D" b9 c    set-car-color) g2 N8 p2 a9 @
    record-data
9 w" u* `% q4 s& R8 Q  ]
' ]* O1 a& Y) \2 c/ m+ r! q( z" s
1 q+ \& d3 s. c( v+ N2 g  ;; give the turtles an initial speed: R9 n7 L' w- T1 P& H" b' I% u
  ask turtles [ set-car-speed ]) I8 a  b; _* }" u+ y% w. x" F' p

+ h& Q" D. z. B9 r2 V  reset-ticks
: D* m3 G( b2 `7 C( u5 H) o1 pend9 k4 _  J7 H6 X- L" o( R/ v

: l$ q2 @6 e6 H! f: v+ P1 S;; Initialize the global variables to appropriate values
- D( [; H6 [. H$ g6 u- {/ |' W( [to setup-globals
# O* V! i4 C/ c7 @1 ]+ H  set current-light nobody ;; just for now, since there are no lights yet
6 m. S- N, R: t/ u1 {  set phase 0
: K9 y+ l# E& {- y. n) M. N6 p  set num-cars-stopped 0
2 `8 a, _1 c2 }" t" B  set grid-x-inc world-width / grid-size-x
9 U9 V$ U/ e2 z  set grid-y-inc world-height / grid-size-y
2 M, P3 Y& y) D9 [. ~' v3 |
/ ^3 a3 Y- J- L# P  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary8 m! ~8 u/ A  |5 e
  set acceleration 0.099  X" y/ S$ ~9 N9 l
end
- d% \1 V/ w+ w1 `  s8 }  j! D, e  l* F& f
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
  E  k8 u. W9 U7 @* E4 m8 P;; and initialize the traffic lights to one setting2 x4 Q$ _/ I: ^
to setup-patches4 f- s+ i6 M4 j$ M, s$ h
  ;; initialize the patch-owned variables and color the patches to a base-color
- k. q# q1 S6 q0 N9 [  ask patches
# P8 ~0 e4 ]4 c; L6 _. p  [
6 `) z1 @' U1 C# K  F    set intersection? false- f% a. o  o0 |  d3 m& p0 z+ a6 K
    set auto? false1 v4 L7 `, Z3 I
    set green-light-up? true. y  O: b9 U9 Z; a4 R1 R" {
    set my-row -1: G' S# B- H# e& U: o4 i# g
    set my-column -1) ^1 ~0 S5 G) N5 j) f1 Y
    set my-phase -1
+ L- @5 h: [: R9 M3 s$ L    set pcolor brown + 3; @& Y: p. c* ~; M1 q/ y. Y
  ]
* y& ~$ h$ ?% u
6 Z4 \2 |" d3 m: t, A# i; D' N  ;; initialize the global variables that hold patch agentsets
) t, \4 G2 n9 Z0 a$ j  set roads patches with
+ g- q3 ]4 x$ c5 Y6 b+ Y: m' l    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
& _( ]( U. v" N" I' ]1 a' d4 k    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 @' T0 d( \: q3 {  J
  set intersections roads with
0 ^. `  v! J. T1 ]) V    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
4 z  x- F- u* e$ m# D1 r    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 w6 C' I% b2 ^4 z/ A  c8 o, @. K4 ?9 e* v8 p: f7 C
  ask roads [ set pcolor white ]! D" V$ {) ]  a7 A+ x& x! J
    setup-intersections
# J( `1 Q1 E/ N0 Zend
  B& M8 y, S, `8 Z$ u其中定义道路的句子,如下所示,是什么意思啊?
1 _/ N% I$ I8 C2 i. i3 o3 ^ set roads patches with; a  {% F$ ]) l
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
7 c; M: \' K' {- {    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
. ~7 J! i+ _& J* G! ~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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