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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。
9 J$ W5 j) O9 O. anetlogo自带的social science--traffic grid这一例子当中,- E9 ?. k3 [4 @
globals8 e: m- s; Z0 h  F6 b* V: p
[6 n; U& x$ Z- h4 q+ A; R
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
3 J- G0 ^3 `+ V3 e  grid-y-inc               ;; the amount of patches in between two roads in the y direction! @' B: u& ^9 K' B' a9 |2 u
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if; z" Q  D6 M& d: L1 G! |4 X
                           ;; it is to accelerate or decelerate
' ^5 x# d/ y% u  phase                    ;; keeps track of the phase
4 Q3 _" I; n: @( d6 E  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
0 T- `9 U& Z" Y5 V* l4 r  current-light            ;; the currently selected light
$ _$ O+ M" l$ O6 y2 S; `0 a; T
6 A$ i8 d+ S! Z' H3 l  ;; patch agentsets
/ A' S( ]6 n3 I: I/ [( K& c: z- \  intersections ;; agentset containing the patches that are intersections9 I, r  a! U, ~5 X+ \9 [! l: Q, k
  roads         ;; agentset containing the patches that are roads
# n( b  N. J9 S2 O( U* C]
- q3 q  d; ^0 l" H2 a1 }2 ?; T9 @8 M) F5 k$ Z
turtles-own
: t- b& \7 a8 s# W$ ?6 a+ p( S6 l[9 ?$ z+ D4 W' L: i
  speed     ;; the speed of the turtle
4 |6 P, D$ a5 d( S3 O, C' a) H  up-car?   ;; true if the turtle moves downwards and false if it moves to the right1 \2 L" R  |3 J( p, [* K( J% j
  wait-time ;; the amount of time since the last time a turtle has moved
0 e7 H/ A/ o  n# x$ x7 f]3 U! f3 W4 t" i  I4 W

& i5 e( \0 R% Npatches-own. r! e) M5 a  ~0 R5 @3 r
[
' H+ k/ z2 A. {1 e7 r4 n  intersection?   ;; true if the patch is at the intersection of two roads
( l; s* B  T% q' ^  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
; x0 ]2 I/ c) N- y8 L                  ;; false for a non-intersection patches.
7 {+ b7 Q. U, N/ v  my-row          ;; the row of the intersection counting from the upper left corner of the
4 w- h: X  [% U% i" s, f7 A; j                  ;; world.  -1 for non-intersection patches.& M5 Q7 H* N7 d4 u' w: q# B
  my-column       ;; the column of the intersection counting from the upper left corner of the' k6 A  K' b5 z' w$ j4 C9 s+ ~( \
                  ;; world.  -1 for non-intersection patches.- A/ }) V2 C: g5 y# g- }' c
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
5 d3 r) }( v8 I- u  auto?           ;; whether or not this intersection will switch automatically.5 b; E* i( K8 q9 d: h5 U* V3 N
                  ;; false for non-intersection patches.1 O! ~; F$ e* k: s/ L
]4 H) J/ Y; o$ X3 r
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+ ^8 E. Z7 k# N0 G
;;;;;;;;;;;;;;;;;;;;;;
* ~1 w& A. h- e;; Setup Procedures ;;
9 {  y/ h0 P" D' `! G0 V;;;;;;;;;;;;;;;;;;;;;;
9 B3 s9 f; `6 R
# E. z4 C5 `/ J( f7 o; D;; Initialize the display by giving the global and patch variables initial values.: T" `8 [$ ]+ Y/ U3 ]4 R- F! A
;; Create num-cars of turtles if there are enough road patches for one turtle to* x4 m# F: {+ [$ f3 j# S
;; be created per road patch. Set up the plots.0 W6 Z) f% |9 j0 ~3 ~7 x
to setup8 K* i. l3 A" L/ L
  ca
2 m; H3 V( }( G$ e' ~, ]  setup-globals$ F) Y1 \) N' q. j

! X/ W% j9 t% y$ W7 A2 t; t  ;; First we ask the patches to draw themselves and set up a few variables
/ L# K- e/ z8 }' V  z) T! B0 M  setup-patches
! L6 t' [9 }0 l8 @2 Q) b  make-current one-of intersections& [- w8 N8 v. i' Y4 N, K  h
  label-current3 V: Z, l: x% ?
0 S5 z. R6 E' }2 h
  set-default-shape turtles "car"
; w! `1 s9 ^% v! }
) H& c' G& E' `0 c9 Q3 L6 U  if (num-cars > count roads)- \: J! D) y0 }$ e
  [; t  ]: h7 q5 Y% x0 c7 [% ~5 O+ H
    user-message (word "There are too many cars for the amount of "( D( R: C( w) w
                       "road.  Either increase the amount of roads "
. C! _4 X7 q" @  i! C                       "by increasing the GRID-SIZE-X or "* a% _- f$ D2 U% m- {
                       "GRID-SIZE-Y sliders, or decrease the "" Q# X6 Y# E6 M* y4 q8 T$ U; g
                       "number of cars by lowering the NUMBER slider.\n"- y/ r$ n. q( n& v
                       "The setup has stopped.")
9 E* d1 T* f; m4 v8 b! ~8 S5 N    stop9 c9 a. _9 o2 s6 W) r+ G: L
  ]
2 M# Y- q4 _3 G7 M
+ V: q: j1 D( l9 {  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color6 o& \8 p& C. U3 i
  crt num-cars/ x# I! \: u% @* N2 Q+ S8 n
  [
& z0 Y8 d- W5 J& T- l    setup-cars% W+ o( U+ u( N% [. d
    set-car-color
/ C; R; G6 s( g. h1 M( W    record-data: y; E* I- [# i' [; z8 r, N4 }
  ]
1 x: t7 Q1 W. v; G1 d  Z5 e1 u+ W; m: R6 n
  ;; give the turtles an initial speed8 E/ `* Y; d& j* b- u& s( J9 s8 z
  ask turtles [ set-car-speed ]9 d( l) H6 I& k$ Z- A$ _( u5 s: |

/ E% u9 J: e' O1 g  reset-ticks
# E1 |7 i2 D6 Q+ G) ^- o( F/ ^end! I# \: Q6 Y( B/ E. y# R3 p. a
; X/ x0 |' `& m/ x, d! M& [* q
;; Initialize the global variables to appropriate values
4 z6 ^& o% w- p8 V$ {4 Ato setup-globals  v* n, J; d8 p. h/ ~
  set current-light nobody ;; just for now, since there are no lights yet
5 P  D6 ~% M4 t( Y5 {  set phase 08 }  Z0 X0 T9 C* C
  set num-cars-stopped 0
7 |) E! R) y; ~% O/ i! q  set grid-x-inc world-width / grid-size-x
8 P$ G, R# y$ l4 X9 B# m8 }  set grid-y-inc world-height / grid-size-y+ n7 S" E! _( N) N5 m5 s3 y- f
; k4 {5 o  ?+ X, S, G( S
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
3 ^1 ?. M$ M8 K! v; a$ N  set acceleration 0.099
" q* c2 B/ k5 Z) I5 H/ qend
# q4 \6 d" ]5 m) x5 r( Y" h) [# M+ q, C/ M8 y& o7 P
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,+ e1 j7 A' }5 h& @
;; and initialize the traffic lights to one setting9 N* {: G; {  z
to setup-patches
9 }5 K* O6 ^. Z  ;; initialize the patch-owned variables and color the patches to a base-color
7 q8 o, m* m9 G4 O% y4 a+ u  ask patches8 y5 ?6 x5 o5 Y; u6 X: C0 t
  [
1 y. P; Y# _+ q1 u) I& ^    set intersection? false
1 f8 b) M+ f% v2 V2 n8 u    set auto? false
6 Q0 ^* _9 o& m4 n    set green-light-up? true. I( k* O5 p9 h' U
    set my-row -1
4 _6 q5 q, [! ^3 ?    set my-column -1
* @( q% j# z7 f+ N    set my-phase -1
/ A% v/ h# P5 I( e( r/ ^    set pcolor brown + 3
& Z/ k2 Q$ _) F) D! @  ]
2 n" Z( Y' i8 p- L
- }# u. h$ J: G  ;; initialize the global variables that hold patch agentsets" [2 \# v/ U# N& \
  set roads patches with
9 y6 N' z" m$ o/ G1 Q/ a$ K/ Q    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or; r( `! Z" |$ y
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]+ e4 |, i; L; D6 S& G# ~
  set intersections roads with
! H, k8 ?/ w" [: a3 H    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and9 y% q9 t3 J9 M5 L/ P# q
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]. Y: W/ Q, G1 y) l3 x

" {: j* z, A8 D8 I' u  ask roads [ set pcolor white ]$ K) ?0 d0 M7 Q: z, U/ Q% ?
    setup-intersections
9 g$ ?+ x; L6 E+ V( M8 E& O$ J4 s+ gend
  o  X7 s) {$ ?  [; [其中定义道路的句子,如下所示,是什么意思啊?
! C+ u) ^8 F, r+ l$ b$ ~# a# q set roads patches with* F) s3 }0 Q9 R: H* D
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or; {* N$ G9 K- Y+ ^3 x
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]4 c% @/ S$ w1 N+ 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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