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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。
: l% B, I+ G# ?; q3 M# Vnetlogo自带的social science--traffic grid这一例子当中,! M2 d! I* x- M: u: M
globals9 \; ^2 m+ s% ^
[# O# G4 }, `6 u4 ~: O7 U, p
  grid-x-inc               ;; the amount of patches in between two roads in the x direction0 s% l  V5 b3 S6 X+ B
  grid-y-inc               ;; the amount of patches in between two roads in the y direction5 _" b2 `% T% ?, _' K" ?% L
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
9 K. G8 M! n1 j                           ;; it is to accelerate or decelerate
5 Z6 Y: Q& V3 s6 `2 e( C. ?( H  phase                    ;; keeps track of the phase
2 T, g* s; w- H, |  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure; l7 [4 w+ W8 E4 O1 B; T
  current-light            ;; the currently selected light3 W  x9 v# i( g1 {' d
  Z9 E' s+ w% ?5 ?5 A7 M, Y* T
  ;; patch agentsets) ]! ^8 `7 ~6 a9 U7 T# V4 }
  intersections ;; agentset containing the patches that are intersections; U) c7 w1 a* S4 f) j: v9 ?# F
  roads         ;; agentset containing the patches that are roads, P) l& N" t* m
]1 u& d8 n1 o5 L5 V' i9 D

0 B- U* O% d; P. x- N  B9 Uturtles-own6 v) ?( @+ `% ]& ]: @
[$ N4 Q1 J% S4 W% k* M8 @; z; W  m
  speed     ;; the speed of the turtle7 P" @/ h" K) K% k# Q4 ~
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
7 O7 H: f% ?8 S  i3 v2 b& c% ~  wait-time ;; the amount of time since the last time a turtle has moved
+ ]0 X; L- _$ K4 e; ~. @! P+ q]
8 \1 w" L' m, G* b$ E6 F* b; ?2 Z: l, m% w1 c/ ~( h* E
patches-own4 Y" }4 R% e: _/ _
[. d, \  S# f# X$ i  q/ U
  intersection?   ;; true if the patch is at the intersection of two roads
% ]. S. E  e' d  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.1 ?5 l& U- ]: E0 H. V$ E
                  ;; false for a non-intersection patches.
  K- b$ n6 f  p2 h  my-row          ;; the row of the intersection counting from the upper left corner of the* V: Q' v+ c; \; J
                  ;; world.  -1 for non-intersection patches.4 M6 d. E' U6 ^3 _6 |% c
  my-column       ;; the column of the intersection counting from the upper left corner of the/ v9 d5 g/ v* X9 C
                  ;; world.  -1 for non-intersection patches.
' l! u: Y7 X( M4 Q  m1 {  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.% ?' l5 E, x+ q! c! s& j* j% L
  auto?           ;; whether or not this intersection will switch automatically.# @4 e1 K4 D' p% s0 z' V0 c( e+ ^6 G
                  ;; false for non-intersection patches.$ |, v% z, o' e% g9 y2 T
]# Q* U8 c( T5 C% J, N9 v# _4 n
' P3 |( g+ b# i5 j" d

# d6 a3 c6 u/ V;;;;;;;;;;;;;;;;;;;;;;
" _/ N# o$ A+ B: Y8 z;; Setup Procedures ;;
) l2 V9 _$ z+ q2 P1 f5 j( a;;;;;;;;;;;;;;;;;;;;;;2 {; W- h+ @( A7 ^- l

4 T. F' s6 Q! H+ q% I;; Initialize the display by giving the global and patch variables initial values.' X" r3 w3 q- K# T* K$ N
;; Create num-cars of turtles if there are enough road patches for one turtle to
- y3 b- S* }" d1 w: a5 Q' b2 m;; be created per road patch. Set up the plots.
0 t  g# }! T6 ?% V; A! Gto setup
& o3 n4 B5 U+ k5 o  ca
1 S/ v. R5 H$ C2 Q& U  setup-globals
; s- g% u+ S$ u; o- \/ p# g0 ~( j; m7 Z3 `: J
  ;; First we ask the patches to draw themselves and set up a few variables7 J  X! X) F4 K" K( D% Z) p
  setup-patches
. d% U) E: p7 _8 e: r% F2 U  make-current one-of intersections
3 c+ _$ V6 L* s( Y3 T, V. r/ G/ i  label-current
4 W+ L; B( y- P3 F% V3 C0 ^8 d. @8 w4 T
  set-default-shape turtles "car"
4 |& }3 `' @3 @/ u
. w1 C  K, I! x1 `  if (num-cars > count roads)
) Q8 f7 l! o- j4 d9 t" m  [+ H; [5 A0 _6 l2 A; K& h. ^
    user-message (word "There are too many cars for the amount of "6 \' D0 ?( X9 p7 a" n
                       "road.  Either increase the amount of roads "
: |4 V/ s! `) w1 T" |5 ?2 N- L                       "by increasing the GRID-SIZE-X or "
( a; S& [; D* z2 j2 \                       "GRID-SIZE-Y sliders, or decrease the "6 X  c  q# h0 L6 M8 e! B- _
                       "number of cars by lowering the NUMBER slider.\n"
5 T" M7 F3 ~6 T& W5 x9 b2 Z+ z                       "The setup has stopped.")! H" ]! B% _' w% i& `, N& R; {" \
    stop
! E" J( D- F' D  ]
6 m0 r+ K& _$ l8 @9 i) H
8 c: b+ f2 j/ D- @7 O: x( r, g0 u  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
" S) X! a1 w; S5 z  Z2 Z  crt num-cars: `* g) S3 `% G. ~; z
  [
8 d2 G4 K; A2 n5 |7 h* l8 Y    setup-cars( T' \: J& B) k- D+ |
    set-car-color
: B8 ], H7 \" l' A+ G1 w! z; G7 I    record-data6 ?( i5 D$ E7 H* o2 q
  ]
0 e+ x' Z7 P# Z5 y4 g1 f: L  v2 I3 o; T5 ?/ j8 b
  ;; give the turtles an initial speed0 e1 p& }  G0 O' g& b- [' x
  ask turtles [ set-car-speed ]
4 M! h- s. q, _. V. t' @
; J# y/ @" {% `  reset-ticks
& ^5 f3 E& \, e1 O2 wend. U' l$ ]) F: j8 |4 H' j

) |$ y: E4 l$ g  S" S;; Initialize the global variables to appropriate values
& |: w' Q. ?, eto setup-globals
5 ?  X4 D6 c8 H9 m6 s! G  set current-light nobody ;; just for now, since there are no lights yet- c( L; m/ U+ o" L
  set phase 00 ]5 |& t7 l4 _9 b: w8 e# N
  set num-cars-stopped 05 C' E* c/ k6 t5 P9 y! d& _
  set grid-x-inc world-width / grid-size-x: z4 ]( v! k& k
  set grid-y-inc world-height / grid-size-y" S# v. `9 x/ k- T/ r" P. j7 {7 R' ]! N

2 l0 }3 k5 q  e0 L' g% _  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary6 |1 A3 `" b, W5 p* C) k
  set acceleration 0.099. r  Z8 a3 F- f0 p4 Q; q* N% A
end* Q, \7 I* [0 e5 Y* y. v7 {" h
8 h7 S6 c( \5 q3 z% P
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,# f& a7 S3 E9 ~3 j( F4 A( r/ x
;; and initialize the traffic lights to one setting* O5 G* ^4 M: Y- d! S0 O$ `
to setup-patches
3 O; V! ^. G7 @' Q  ;; initialize the patch-owned variables and color the patches to a base-color! `9 r8 b) R/ d: c7 {) N
  ask patches
, c8 N' ?, L# }  [
3 }) Y9 c" j/ z2 m; {    set intersection? false
  g  L" @) H1 j% z( v6 A    set auto? false0 n8 l4 d% I# `/ F) O
    set green-light-up? true
/ j3 o. C. j; V8 f4 \    set my-row -1- @  K% q8 g( R: T2 _
    set my-column -14 Z9 E5 E, v7 I1 q
    set my-phase -1! ~. q8 ~/ P0 I2 l, e* w
    set pcolor brown + 3
$ U6 h* X. i! Z  ]
2 N7 ~: I7 T" [' w/ [7 q3 c$ J6 B* _1 H, q7 p- X
  ;; initialize the global variables that hold patch agentsets7 }; {0 p1 t: M) ]5 M) g3 q
  set roads patches with" Z1 d& f5 [& ^2 {% A4 |1 O4 ?# y
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or* K% W$ `3 E# L. m4 `, i+ t. j
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
: k* j5 M$ ~3 s4 y& l+ w2 _  set intersections roads with, z* q5 P. \0 b+ i6 M4 P2 K
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and) a/ n9 [6 g. P, Y
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]& e' Y( |- S# V4 h  @0 V+ H3 q$ W& |) x
& Y+ f/ E% @/ c/ L
  ask roads [ set pcolor white ]
/ _1 L; T+ @$ W( b! K    setup-intersections" _- }( F5 Y# _. X5 J/ W
end
& @! c6 e+ ?4 V" S  z1 s3 N其中定义道路的句子,如下所示,是什么意思啊?5 }  ]: E; ^1 d" J
set roads patches with
) Z3 j. L5 f- K3 ^* d* _    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
, T& C1 e; ?; w+ y* v1 g4 u% B0 }    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 F0 [& o, t* n& W- w
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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