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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。
. a# L6 T2 L  j- f& q; l' w* x# Gnetlogo自带的social science--traffic grid这一例子当中,
& g, h$ |0 K! y7 H7 \+ c; B! sglobals
" q8 }. L$ k; u; A" s9 B9 j[) q0 z0 J; L6 ~
  grid-x-inc               ;; the amount of patches in between two roads in the x direction" e, C5 `& g( T; _. @% z2 {% ]% `
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
4 |" _. q7 u3 h, n% ^( W( o9 _( ?  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
! m+ a" B9 z) n  I$ p) \/ o                           ;; it is to accelerate or decelerate7 D9 p+ l% R2 X2 f* A7 Q
  phase                    ;; keeps track of the phase- m1 Z. k4 \: @0 O3 [9 L6 [: @
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
2 o  Y( |, F' `3 c- P" r  u% d  current-light            ;; the currently selected light
8 K: q# [4 i% ?
. u' \( J7 D. s: c7 G' L, I- [- V  ;; patch agentsets
0 L! G. W/ R" |9 u, \! y( @  intersections ;; agentset containing the patches that are intersections7 Y, ^5 }5 J3 ]3 \
  roads         ;; agentset containing the patches that are roads% `( ?  x4 a. e6 H! n* M$ r
]
' ]7 H6 F$ P4 K
) \( |2 T9 b- k' }) }* N% @turtles-own
$ ^0 i# W. [! n, \[0 r3 r2 f7 T6 \; b* i) q
  speed     ;; the speed of the turtle
, I7 \2 W8 m# ]1 i" r8 o! ~  e  up-car?   ;; true if the turtle moves downwards and false if it moves to the right6 [; W6 o% h6 V  c" m% {8 I
  wait-time ;; the amount of time since the last time a turtle has moved+ L1 U+ z7 \0 M" `- m; x6 Q  r, ]" i
]
6 s% h' ~  J9 n, q% a8 a/ |
& h7 [- u# k  M3 S' ~( h- c) Ipatches-own
8 T5 x+ z) i5 z# Q. `[
# I5 R6 P) S6 z1 K2 O  intersection?   ;; true if the patch is at the intersection of two roads  E! t; ^6 p/ A5 W- S
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
$ b3 o! f# T3 i4 k- c                  ;; false for a non-intersection patches.# P! A9 r6 e! w1 e) `0 Z- m2 s8 _
  my-row          ;; the row of the intersection counting from the upper left corner of the1 [8 V* _  G" ^! \$ {( w
                  ;; world.  -1 for non-intersection patches.
% x3 j! Q, S0 ]  r  c  my-column       ;; the column of the intersection counting from the upper left corner of the
* b1 D9 L& B% I. y( h, V6 Z% v                  ;; world.  -1 for non-intersection patches.* K; M! w; ?0 C" l
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
. K+ W! L! I( j( m2 m- D4 l  auto?           ;; whether or not this intersection will switch automatically.
" L9 \) i- H$ T' L+ g                  ;; false for non-intersection patches.
5 T- H% a+ M9 L4 }+ P% q]9 ?6 p7 R' i; c

/ B' j+ n: k9 ^4 D! n7 F0 ^* {4 F! Q0 j+ \2 H) \) K
;;;;;;;;;;;;;;;;;;;;;;
- [+ p5 Z8 x& X; P" `( ^2 B;; Setup Procedures ;;. g/ n9 k# a$ b9 G' ?) o" m$ ^# C
;;;;;;;;;;;;;;;;;;;;;;& N& S. P9 c" u! i5 |
7 L& X7 j8 m- f
;; Initialize the display by giving the global and patch variables initial values.
/ r$ y) Q% _5 t. H;; Create num-cars of turtles if there are enough road patches for one turtle to
, A8 J0 O- \5 @$ t* L;; be created per road patch. Set up the plots.: ?8 [. V, o# d' j) c! u- O
to setup
* e4 y% r0 V4 B& t* H, I9 y  ca
0 `& S; N7 B6 R' A# t. l  setup-globals
; l. ?* y' u& }( E! l$ c- h& O* K  y
  ;; First we ask the patches to draw themselves and set up a few variables8 m! |5 k3 m( [* O/ x8 v
  setup-patches
1 ]5 z- v: P1 E! }- p  make-current one-of intersections1 q" P% v: K; o; e
  label-current6 q' V  F; K; D9 f2 K& u

& f8 t7 Q6 H& V  ]% A8 j8 Y  set-default-shape turtles "car"/ w3 C7 \& L' _0 \8 j4 C/ s
$ m" _) Y2 g* Q1 ^
  if (num-cars > count roads)
& `& w0 s6 O% w  ]; m# z4 e: X% N  [3 E8 e' A; T) s0 @2 t
    user-message (word "There are too many cars for the amount of "- N& C  r& z  L* m) D9 k* t+ r! t# ?
                       "road.  Either increase the amount of roads "8 `5 J! C& ^9 }% f& c" ^
                       "by increasing the GRID-SIZE-X or "# n1 h% R0 z+ C8 E0 d" _, g
                       "GRID-SIZE-Y sliders, or decrease the "7 r: h7 Y7 H* A. R
                       "number of cars by lowering the NUMBER slider.\n"4 V8 Y! q9 {1 @9 c2 A$ W
                       "The setup has stopped."); N* ?4 O2 g4 h: v3 |2 ~! i
    stop
) b- Z9 g" G# q  ]
4 {* Z+ J( ?, p' d* l. c! v  w- ^
+ m& K  x5 u2 R. P; I  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color4 v! Z+ Z* I! m6 l* \  l1 t
  crt num-cars
* |3 [' Z0 P) p  [
- Z( J: |# R7 p3 N* _8 k! I- d    setup-cars* L4 x: ?$ X8 \5 n2 u9 y6 z
    set-car-color
& y; T1 Q" {/ Q: Z    record-data
* P: v- m8 F/ j8 n2 `6 y9 X% |% c  ]9 r7 o% f% g) T! n6 X: P+ c  ?. G

5 V9 a" e0 c1 V/ _2 f! Z  ;; give the turtles an initial speed2 F( {: h9 `3 `, d3 T- A
  ask turtles [ set-car-speed ]
; }: R' W$ y) e& b! a5 M0 m
9 d; ?3 K8 {$ z  reset-ticks6 p) h! P$ I9 U  }2 j
end1 l3 x$ M3 p. E/ H9 o

- F# t, w* _6 o0 A;; Initialize the global variables to appropriate values" k8 H( X6 A# d+ d2 V
to setup-globals
+ Y! O& e# B% W6 o  set current-light nobody ;; just for now, since there are no lights yet7 L/ E( s  ^/ C$ @4 K
  set phase 0
, B' t1 ~( `" U+ R0 c4 C  set num-cars-stopped 08 G( t# V% D0 o; C3 N
  set grid-x-inc world-width / grid-size-x3 L) I  K# D6 ]* l3 Y
  set grid-y-inc world-height / grid-size-y, Q, I, n* d  [' G5 W7 R

( I' o" S8 Z' k- c  C! o0 R9 P  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary( ]( U! l4 w8 H# m+ {$ b& X
  set acceleration 0.099
9 F5 g5 j! K0 G$ r" _end- X1 S& ~. ^9 H7 [  p+ }

' \; F9 ]3 X$ \: R+ m;; Make the patches have appropriate colors, set up the roads and intersections agentsets,7 n' o! l/ }3 [" o5 K
;; and initialize the traffic lights to one setting# s+ W& n" D9 I
to setup-patches
# u1 M" G& d( T; D: z  ;; initialize the patch-owned variables and color the patches to a base-color
" H9 Q! R! I$ o  ask patches
* ^. ~5 n. x: ~  [
4 M6 q: h" `: D: s- i    set intersection? false1 O. e! a& s4 T& a# r/ _1 B6 H
    set auto? false$ i; k- O0 S4 Q$ w% p
    set green-light-up? true
8 a/ e, M, E8 k    set my-row -1% S& C, a' j+ C4 w4 G
    set my-column -1
& O$ f- E- h" C2 X0 l% C    set my-phase -1, y  c+ O3 E9 a. O& z1 {2 x& j
    set pcolor brown + 3/ d9 [: _' Y6 ^/ S3 c$ J0 v
  ]
0 U" B3 N& m! a
8 f0 C9 K' \! y, [  ;; initialize the global variables that hold patch agentsets3 I  \" m) [2 I1 E! f! n, c
  set roads patches with
: Q1 G1 R& r6 f, [' n$ Z+ u    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or! q  a3 Y, w3 p& c2 F8 F- M8 l
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 t1 e  e  P+ X$ T7 _' \
  set intersections roads with
' I' h0 h9 ?1 x! w" }    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and  }! z) Y( D' {/ E5 X. V
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]& E. f0 M* ]9 K  v1 U- [5 h
5 l3 x3 u6 E. E5 A! C- T
  ask roads [ set pcolor white ]
: ?# Q% n% j8 t4 j) l    setup-intersections
# X; O0 a( S4 g4 c3 j  K! qend  p! @* P0 ?: |& C3 \* ?
其中定义道路的句子,如下所示,是什么意思啊?
1 M+ w$ [8 l* l) P" e set roads patches with) j( j: }6 E. h. b5 w
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or' @, E/ K" F  f' c
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]9 ~' }6 @, _! |% p, X5 v
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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