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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。' y; M8 m: u% t" a4 m0 A$ q" S: J; n
netlogo自带的social science--traffic grid这一例子当中,
5 {! q" d4 r* ^' K; J+ @; ]globals
; B$ x% w* h( ?9 R5 s/ t) e  r[! {8 C1 n  u& W" G
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
4 |; k; R7 |3 e. s2 f; Y8 Q7 X  grid-y-inc               ;; the amount of patches in between two roads in the y direction1 b+ B: b% S3 I- @: O0 h
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if3 f9 {( n8 r; o- y( ^
                           ;; it is to accelerate or decelerate3 _  `. l4 _5 v8 f! h6 k. ]3 _
  phase                    ;; keeps track of the phase* l" L# E5 e, Z) P  _/ I
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
7 L' U. K6 p; U2 c- h  current-light            ;; the currently selected light( J2 B- e$ f$ |2 n+ V6 u+ Z+ X
. f7 h) b' W. J
  ;; patch agentsets
$ f9 l- b: o) J2 f' d  intersections ;; agentset containing the patches that are intersections5 {1 F, [% p. f3 J
  roads         ;; agentset containing the patches that are roads
2 Z% `! C( `) @9 G. u! C]% _# {) |! z8 s% k' w) J3 w' L/ c
* A0 S3 P, T" L$ I/ E! u
turtles-own9 O1 [6 P: r+ U
[& d" b8 y: b/ e) k. V0 ^8 I! ^
  speed     ;; the speed of the turtle
1 l. K0 D0 W5 F7 j. J- g) O7 P  up-car?   ;; true if the turtle moves downwards and false if it moves to the right! U; J/ W$ ~4 X4 V  T# B
  wait-time ;; the amount of time since the last time a turtle has moved2 [- Q2 J8 Y4 j* n8 {; c& [
]
- ~3 d/ n2 F, r' v8 Y
  t/ v8 a1 K) a1 h3 Hpatches-own
/ i+ G5 S: j- l. _, M[
% ^  q' z5 z( n4 E6 f+ t9 M  intersection?   ;; true if the patch is at the intersection of two roads4 B( J1 w9 y7 I1 J5 C% n3 L
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
/ o: V2 r4 ?3 D. I, ~                  ;; false for a non-intersection patches.. n: P' C9 I. h6 J. Q/ H' k
  my-row          ;; the row of the intersection counting from the upper left corner of the" j  W* o! b1 {' P5 l7 ~
                  ;; world.  -1 for non-intersection patches.
% B9 z9 d1 t  r, f+ p& m/ _  my-column       ;; the column of the intersection counting from the upper left corner of the
& s+ ~7 `  I+ W! K6 k; e' M                  ;; world.  -1 for non-intersection patches.8 c; Y6 D( l4 J$ i
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
' }. Z+ \9 x/ d" x3 n  auto?           ;; whether or not this intersection will switch automatically.
$ O" a6 H0 G: p% a, @& J; s                  ;; false for non-intersection patches.
! z0 @5 N9 B8 ?' {! I]9 I' S: @% v" A
0 ]* d. W; ?8 x% @' z
+ n! @8 G% V; M9 ]  W$ a" Y
;;;;;;;;;;;;;;;;;;;;;;3 }* n% u/ o- X+ _- p+ v& a
;; Setup Procedures ;;
. |5 U) u4 V; ]* Q* O' {, v;;;;;;;;;;;;;;;;;;;;;;
4 d/ R  U' m8 q  J; }
  V  c. w. ]1 s# \8 f, O+ \;; Initialize the display by giving the global and patch variables initial values./ J, y  Z$ _4 {, c5 D5 g/ {
;; Create num-cars of turtles if there are enough road patches for one turtle to( E8 ?' K$ }: c' Y6 v' y& i; r- W
;; be created per road patch. Set up the plots." L# \1 s9 a4 S  ]" M3 Y8 b. y
to setup
5 ^- c8 E  g7 h1 W5 N5 d& @  ca
# Q' L1 w9 g2 h# S$ x4 F" _3 f. @  setup-globals( I# q7 `* X- i! Q0 @' z
7 x$ \' |" j( d: i3 H- `. d4 x
  ;; First we ask the patches to draw themselves and set up a few variables6 f; i; U) J! H  S
  setup-patches. ]" c' V+ L6 D9 ]# k
  make-current one-of intersections* V9 d7 S" ~" ~! q
  label-current4 V, D( v. n& v

5 X+ r9 I/ M& q2 p/ {  set-default-shape turtles "car"' A2 r3 s0 v, a0 A! c6 I4 [0 b

- r6 s3 S. c) k3 p. l. v  if (num-cars > count roads): F! B/ ]3 e. I, }1 q0 Z2 F6 i, H
  [' P" S3 e& f/ A) y, s2 p" I7 U
    user-message (word "There are too many cars for the amount of "
' f% y9 r8 ^" [! ?6 |9 g                       "road.  Either increase the amount of roads "
1 |5 j) A. _7 `" U3 V+ t% A0 U# l7 l                       "by increasing the GRID-SIZE-X or "8 I5 V3 u8 w* t1 S! A) E- i8 G% l% U
                       "GRID-SIZE-Y sliders, or decrease the "" a/ ?! S! p) Q4 m0 K
                       "number of cars by lowering the NUMBER slider.\n"
1 L  Q7 l1 p4 i6 M, l) E4 @                       "The setup has stopped.")0 G5 ]# e1 E. r2 P- M, p  i
    stop
% L: d, p( Q- z+ G7 @+ X5 Z  ]! W- {3 z7 K  }8 p  a( \

  b! Y5 ?" M+ s  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color) F' W% I. I% h: ^, U
  crt num-cars& x3 ?- r7 V0 R# h% B' V5 f
  [
6 R( b  E, X) }3 c# p" h% V1 y  A    setup-cars
, @' ~' t( y8 v" P2 L4 M    set-car-color+ J! Z1 C7 P# Y1 H8 r; t
    record-data
# N( h- E+ Z8 v! H  {  ]8 ]8 j1 D  [2 d2 K5 R

8 }% E4 p0 ~- U  ;; give the turtles an initial speed% t6 \) h, h5 H! S: D5 ^
  ask turtles [ set-car-speed ]8 W' E0 f+ p+ P6 U
0 o- h9 z! @3 }3 L" [
  reset-ticks
1 k1 a3 f- r. G3 c8 Z3 e) O5 s) Y! vend
7 _$ U. Z) }+ [+ b- G9 X) ]# S5 q6 C/ P. k* f8 n! i) E; u7 ?$ C
;; Initialize the global variables to appropriate values, Y/ S: [$ F. h' K
to setup-globals
( k+ J, k# s' }' @. T. E  set current-light nobody ;; just for now, since there are no lights yet, r7 l" B- {$ N" k. @
  set phase 00 Z3 u/ E6 V6 F
  set num-cars-stopped 0
" g2 }0 S" r+ {  set grid-x-inc world-width / grid-size-x
/ }1 `) U! T; |. _' h  set grid-y-inc world-height / grid-size-y
' a! H# Q  D$ W) f" Z  Q
/ Z* B8 G( x# b; N+ m  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
- [  J; e6 X9 K( F8 d: k! p  set acceleration 0.0995 I! n* Y! n" i
end
3 Z$ ?/ E% I- s: [
% k5 Y! f9 |: O;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
- Q5 b3 [+ j8 O+ d' L;; and initialize the traffic lights to one setting
2 c; C0 x$ I# D( H, T! c  j. Gto setup-patches
/ F6 |$ K: f5 a; d  F9 E4 D  ;; initialize the patch-owned variables and color the patches to a base-color/ q1 \" H- n( g2 ~/ K2 H
  ask patches8 Z5 w8 V9 V; i5 h3 z; P
  [
/ W$ v$ O8 k' Q$ o1 h% ^9 ~! L    set intersection? false
& q( X! y- K) x1 K$ K    set auto? false9 [& g. ?4 }2 D: w0 E/ a; r- K
    set green-light-up? true& b6 ]# M9 b% i- L" I, E
    set my-row -18 F9 C7 H* {+ c* y9 v
    set my-column -1, Y; b/ y9 V2 j! H, V2 `- T
    set my-phase -1
) E/ E6 B( a9 q- _; ?    set pcolor brown + 3' N/ s+ m$ v- t, }8 d
  ]
8 _% H$ U6 r- U* I' G+ Q/ E9 A: Y* K( j, u: }# z
  ;; initialize the global variables that hold patch agentsets) V1 o7 b1 A3 }% z
  set roads patches with
3 R5 l, |( ~+ Q  v( J    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
. k' Q/ Y- z' q8 G    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
8 I; ~5 I6 k& [; u4 K2 Q' d  set intersections roads with
. G1 D9 K! K) u- b. V! I    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
* h( G$ X  n1 e. q- R2 ?8 w- X! n    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]! Z. u# a! m* Q' u

  x& {5 d6 p2 v- ]2 ]  ask roads [ set pcolor white ]
2 b( R1 S+ d9 x* @: c& T' s1 D    setup-intersections4 H3 h+ h' p, _" b8 i2 t/ u
end
1 x" |9 i* F% q$ D' z" Z其中定义道路的句子,如下所示,是什么意思啊?
2 m! W0 V3 U- @+ T set roads patches with3 V- U% O1 E5 d* e( l
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
' D  }8 x( S, U% H    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]! M8 \- M, K" P2 I2 m/ 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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