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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。
$ t( U6 B+ E5 U  n1 E1 Znetlogo自带的social science--traffic grid这一例子当中,# B2 K5 A$ Y8 O9 c$ C
globals
' y+ G* B  y! e1 B. T& H[
! C& i3 }" n6 f$ X8 g  grid-x-inc               ;; the amount of patches in between two roads in the x direction  Z+ ?, x/ d8 }  p1 b" _4 k  w8 Q
  grid-y-inc               ;; the amount of patches in between two roads in the y direction  k1 H/ c, a8 }3 m- |' \# m
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if0 L/ R9 j) U, i, B8 Q
                           ;; it is to accelerate or decelerate
+ [- M& g- R$ T; }, @9 Z  phase                    ;; keeps track of the phase& o! {( v' N' y+ G/ `: w$ M
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
1 e5 t+ f7 [" q$ @# [0 `* o# w$ t  current-light            ;; the currently selected light
$ a' a$ l9 h3 e0 H" S
# `# A. t$ P4 v  ;; patch agentsets
- V& T7 [" d! Q2 y  s  intersections ;; agentset containing the patches that are intersections, B( ~* `$ M, e3 y8 V. B. f: W8 K
  roads         ;; agentset containing the patches that are roads
7 m9 \7 n1 D5 `5 L( g0 O; G( g]
0 h4 g8 o8 {0 j* K  o# r" K2 g0 r8 V- U' o. H  e
turtles-own' m4 C- F( W3 h1 @
[
4 e7 a+ I# p; @: j4 I' t/ w! T( E  speed     ;; the speed of the turtle
( X8 {: Z, U2 z) ?3 `5 j  up-car?   ;; true if the turtle moves downwards and false if it moves to the right8 M3 @) y6 u3 d" s! S
  wait-time ;; the amount of time since the last time a turtle has moved9 S0 ?$ I. m5 Z# I
]
, q5 z  j. Z- C7 S* E0 m2 V
( V: {3 x  s5 _2 y9 Lpatches-own! i# \4 O/ A: O7 J+ N' P& r4 X6 d
[
; S& G8 |0 j; r9 a  ?, M# m3 o4 K  intersection?   ;; true if the patch is at the intersection of two roads
) ~* y  i. j1 D% S  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.* a+ R( O6 E- h* ^2 n5 z
                  ;; false for a non-intersection patches.
3 G" O, Y: Z4 a# O# \9 Y  my-row          ;; the row of the intersection counting from the upper left corner of the) A" u, @$ H& _3 k: V
                  ;; world.  -1 for non-intersection patches.7 Q5 M+ r4 h" a* [( M
  my-column       ;; the column of the intersection counting from the upper left corner of the* I/ t: K; M7 P& u; _
                  ;; world.  -1 for non-intersection patches.- |. _4 @% V# ?2 `& u
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
3 O/ R# n5 m: T' ^  j3 X' {  auto?           ;; whether or not this intersection will switch automatically.( C# i0 A0 E/ B. \
                  ;; false for non-intersection patches.& K% ?7 s- t# S% B
]
$ H+ C  M' \& r. Y) D4 x6 g2 s
- M0 F$ R2 L. q  C
1 D( I7 T2 q0 S( U8 q4 g  c;;;;;;;;;;;;;;;;;;;;;;
: ]& M" @0 A; X2 F+ H0 I;; Setup Procedures ;;
+ X8 C) ?% f5 }5 d+ D) O  e;;;;;;;;;;;;;;;;;;;;;;
1 w' S2 Q& g1 I# o/ n$ v! _7 }! A: G; ]  ]
;; Initialize the display by giving the global and patch variables initial values.. b9 f! `# @& C4 B. j9 _7 W$ @: r
;; Create num-cars of turtles if there are enough road patches for one turtle to
2 _- ]1 D7 c' g! c4 j/ `;; be created per road patch. Set up the plots.! L* B6 b9 b* s" y) ]* z
to setup
( `  O8 M/ }1 ~" q, c0 w  ca
, D4 n3 F, c1 u  setup-globals$ U5 K! c! D& w/ I0 e. Q
' V) P# T' F4 u1 s5 _4 j
  ;; First we ask the patches to draw themselves and set up a few variables$ N" z+ |* {8 p7 E% d1 @. g
  setup-patches
! v! [. y% M, Z% ?, o  make-current one-of intersections
' I2 [: b( @& i/ G  label-current& @/ p, d! z% A# l

6 l! R* N5 @, d" Y# I9 P& B5 k& o  set-default-shape turtles "car"
# k! q$ T9 P4 X5 k/ H. D0 L  d
! c7 h  t. M% p, s; ^  if (num-cars > count roads)
+ ^$ d, {8 t, Q5 o% X' y  [
1 ^  s* j5 [. H% N: U: h5 t2 m    user-message (word "There are too many cars for the amount of "
- N7 V# i4 N9 \+ K9 r9 b                       "road.  Either increase the amount of roads "
- T. ^+ ]4 l, q2 a4 X( r& o                       "by increasing the GRID-SIZE-X or "
, m' l0 d0 p+ z( H9 v! F/ I                       "GRID-SIZE-Y sliders, or decrease the "5 t+ T7 _6 p4 w8 W2 v: N1 M
                       "number of cars by lowering the NUMBER slider.\n"
1 [) \8 H; u% m                       "The setup has stopped.")
8 S) j7 V. W7 Q" B, l    stop) s3 N+ G9 r2 |2 P
  ]
+ u# f/ k6 D6 I, m$ U  J* Y& K; z  w4 C1 H9 Q4 @: ^
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color1 @4 R' e8 C" z9 G6 R
  crt num-cars
# R+ _# j+ y$ `# V1 f) S$ w  [
, W& v" {( B4 }1 M) t3 y6 x    setup-cars0 S* \0 g, t$ c: ]) x& N
    set-car-color8 x1 N5 X- l9 X# M: }+ T) a: ?
    record-data
$ L4 u' Z- U6 ]. v$ U4 T% C4 n* l  ]
- y# b, H! `3 H! D" \& {: ?7 r5 v! g: X+ n* w
  ;; give the turtles an initial speed% M1 e. N$ m- {' l
  ask turtles [ set-car-speed ]
, p8 N! P* U8 Q# B" l5 y
& o6 |, B2 @1 q& L8 X  o  reset-ticks+ H, R  q1 [  s* d! [! B* m
end0 m, N5 G8 d6 R' e% T% O+ F
; S; D( c) Z; h! @- H6 P
;; Initialize the global variables to appropriate values/ A; c5 _, Y  @# {
to setup-globals
4 g; f7 M* \, i  z( W1 Y$ _" x  set current-light nobody ;; just for now, since there are no lights yet
, A6 m" J# w$ x4 C  set phase 0
# N6 K# j, ]' Q  set num-cars-stopped 0
1 B# B6 a) C' `  set grid-x-inc world-width / grid-size-x
8 U/ `  K. x0 W) ?% `/ G  set grid-y-inc world-height / grid-size-y
" E( l6 P" B! f1 M% U% H/ O$ ~0 g  M# [+ Q! l0 Z
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary2 |" }3 w) H/ K2 ?4 z1 a
  set acceleration 0.099
. U% H6 o+ ^) P3 c! j" j# Lend
/ a4 s4 I( l9 f! s; ~0 P6 I7 j7 |5 {  ~4 n/ L7 r
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
/ y/ @' U* @) ]6 J  K;; and initialize the traffic lights to one setting
. @6 R" X' U% g1 S; T4 Hto setup-patches1 J9 z7 d' ^" z1 p
  ;; initialize the patch-owned variables and color the patches to a base-color
8 [3 M2 Q1 {1 U- W  ask patches
2 }7 y- I9 u9 l& `/ N1 d! n  [# h9 L+ M# y) {# X& ?
    set intersection? false( f; K2 |- K- V' q, w5 Q
    set auto? false- @9 t9 W, r2 U7 i% n4 Y+ D+ X; o/ s+ R- e
    set green-light-up? true
: T* c1 w: i  D# f$ D7 M3 Y+ W    set my-row -17 j1 }- y/ f& `- X7 {, }4 [
    set my-column -19 R3 E4 {9 y6 k7 I
    set my-phase -1
( M( ~" Y: E- |3 s% [# c4 W    set pcolor brown + 3
. E6 o& E8 k8 I  }  ]
" A+ C2 H+ Z2 c" _( y1 D  L* q" m4 Q& e1 G
  ;; initialize the global variables that hold patch agentsets" ~  v$ z! Q- a6 A$ \/ s" R
  set roads patches with/ J$ I9 A0 b% t
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
9 K6 m$ e9 V% [- I5 D    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
4 x1 x* @6 B$ s7 _! i# U7 T  set intersections roads with  x6 v7 k1 D& F) b, \
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
, Y: f' d* F2 x( U& H    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
' G# W+ z! \8 p
: ?% V2 Z! T3 Q  ask roads [ set pcolor white ]- ]! D% ?2 p, j  z6 j
    setup-intersections
% l* X' O+ i; _/ W0 eend
" ^- P3 d7 _( [) E其中定义道路的句子,如下所示,是什么意思啊?
& z9 d, {0 S1 C1 g) U9 ? set roads patches with: z$ y0 C  e9 H
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or  C9 {' z, ]) S3 J, a% R% p
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 U7 F# i  @- b6 Y  `4 J4 ^
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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