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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。
! }  a1 k9 S7 G' cnetlogo自带的social science--traffic grid这一例子当中,; s1 E6 q& O) @  {( D! H* P$ Z5 q
globals/ \* c+ H% y) W/ A& P
[$ J0 P" w8 O" K2 h% B
  grid-x-inc               ;; the amount of patches in between two roads in the x direction9 q% L# p% N" V" p8 B0 i9 y3 R
  grid-y-inc               ;; the amount of patches in between two roads in the y direction  C9 E$ h% d, `
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if$ ^$ Q; \& J' @* P; E$ v5 n
                           ;; it is to accelerate or decelerate
# q0 }4 m6 R7 u3 ^7 j  phase                    ;; keeps track of the phase" {+ A/ i: x  ~
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
6 p* a( l/ o; q; Q0 P  current-light            ;; the currently selected light: n* `. W& a; Q, F/ n
/ ~3 b+ q( D2 m/ o/ a( t3 R* i
  ;; patch agentsets4 @3 F  T: [  o! W
  intersections ;; agentset containing the patches that are intersections, s5 \) M0 |8 h* |
  roads         ;; agentset containing the patches that are roads
) w4 W8 f# S* @% ^7 x]
' C% \* C  I1 c$ H3 Q/ B! _3 A5 g
& r1 n- Y( Y/ N% @" P! Oturtles-own
0 ]( ]" X+ r( s8 r- ^3 O[: {7 k" T9 Y; ?% g2 q
  speed     ;; the speed of the turtle  a7 c' U! T1 P
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
% L% x- ^+ J0 T- ?: p2 P  wait-time ;; the amount of time since the last time a turtle has moved3 [2 e% X1 H/ R
]0 @0 T% c; r8 p6 \" b

/ W6 z& v7 T$ h9 |patches-own
: _, L- b8 v8 R" f# J; x8 v* Z[, d* D; R( Z8 h! D, K
  intersection?   ;; true if the patch is at the intersection of two roads
5 S# U3 _- `$ z! ]2 U# N  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
  m& C2 w9 x& P7 z7 Y) ~                  ;; false for a non-intersection patches.
# Z; d3 ]8 f7 ?  ~3 P4 ~  my-row          ;; the row of the intersection counting from the upper left corner of the/ }- N- w) Q' S# D3 {8 z- ^
                  ;; world.  -1 for non-intersection patches.. H' q) C+ q! i5 L
  my-column       ;; the column of the intersection counting from the upper left corner of the; T+ L+ o1 S3 Q% W. p  M+ Y7 Z2 |
                  ;; world.  -1 for non-intersection patches.
6 u1 d7 \# g* i! ~$ b2 \! u' V  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
$ w" s4 O; i2 l! g( N  auto?           ;; whether or not this intersection will switch automatically.
$ n( [" c6 f- j: }# D# R% r                  ;; false for non-intersection patches.
( @- N7 J) y) C]
/ o, {* B( T: k* v* N+ a; i1 O  e& b+ H+ S5 I8 p
: s& ]+ P0 j+ Z6 V: B+ }
;;;;;;;;;;;;;;;;;;;;;;
$ ^' y. r" s3 ~9 G* \;; Setup Procedures ;;
( t3 _7 @5 m' y;;;;;;;;;;;;;;;;;;;;;;
9 e' R  q0 p5 g5 t& h
* J- F2 `6 {. [& |; [;; Initialize the display by giving the global and patch variables initial values.' P, t* v5 T% C) w
;; Create num-cars of turtles if there are enough road patches for one turtle to
* S; v# F; x" g* v& z) k;; be created per road patch. Set up the plots.
: r3 {1 o7 e& B) u/ E0 Yto setup
" `  a* i& @" W/ ~' \! ^  ca% J- l' V2 i" i  f
  setup-globals
! {" @4 K. q* {! m7 ?1 v
8 Q( o+ w6 q) [* C  ;; First we ask the patches to draw themselves and set up a few variables
; G& t4 N4 w% D5 K  setup-patches
9 `$ i! s& g' w  make-current one-of intersections$ {3 f  ]; E9 X
  label-current
1 U; @: T- I5 ^3 Z  g. z& {
. v  @0 ?; I: Y% M: ~7 g8 {  set-default-shape turtles "car"+ T6 p3 e& V: L; u- c" I4 V  Q
- I1 m9 t/ u' F
  if (num-cars > count roads)* A9 @, F; C, i- |. X! z
  [& }: W4 a6 }" E1 c0 ?
    user-message (word "There are too many cars for the amount of "
- U0 S& m4 S) E1 u                       "road.  Either increase the amount of roads "
# A; L) V9 k  k2 _/ z" P                       "by increasing the GRID-SIZE-X or "
: t9 R5 I9 z: I3 R. t1 S                       "GRID-SIZE-Y sliders, or decrease the "
* X5 I* k8 B5 r) o+ {* \0 e                       "number of cars by lowering the NUMBER slider.\n"3 R" N- r* J& U8 [
                       "The setup has stopped.")
& w! p( c( w; q( i    stop6 M; V  c" W7 e5 x
  ]
4 B2 z- e0 A: N# J; ~9 V
5 G5 O; H* A- R  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
- m; y; n4 [$ k# M0 e2 b5 l  crt num-cars; o& e2 j$ ~* O+ D# U& B9 W
  [! t  B* L4 f& Q& S. d- X- `) g6 n
    setup-cars
( w$ S& ]( n6 k8 H1 J    set-car-color
+ P6 m' Q1 f, F    record-data
5 O/ D6 S0 O& m5 a5 r6 E8 @  ]
& W7 L8 a  V* b, J& ?! w* _
# v& c4 W3 A# }  ;; give the turtles an initial speed
% P0 P6 N# P9 l  ask turtles [ set-car-speed ]  r7 Z/ b7 M. I5 K

7 J6 _9 S& g, M' L  reset-ticks
$ @! E8 O4 ]4 h3 B3 z0 Z. y1 bend' M- w: Y2 `6 N* \8 s: A4 @
8 J7 c- J- i4 p3 O; A
;; Initialize the global variables to appropriate values: k5 Z- E6 Z$ j# T
to setup-globals7 T8 g+ c1 I+ e$ q
  set current-light nobody ;; just for now, since there are no lights yet
- L, D/ q8 B& R  set phase 0
3 }% z8 N3 U0 h! M  set num-cars-stopped 0
; `: f% Q5 X) H, q  set grid-x-inc world-width / grid-size-x+ ]" H$ |  }- w2 e8 S) O
  set grid-y-inc world-height / grid-size-y
, u8 F+ D5 ~; p
9 q- t$ C) X. F; R  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary/ Q5 W! G9 f! ]9 [. a4 ?' x  j  t: c
  set acceleration 0.099
; u. Z+ X5 n! P" z7 W2 z: r& m. fend7 n. G8 \: M$ L# h  c2 I( g: w4 d% q

& y7 Z" ]1 ?% ~$ M# I;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
. [: X/ \. U+ X. |7 L1 {7 M; `; Y;; and initialize the traffic lights to one setting2 a! {( |; X& _3 D3 U: t) A& f8 o
to setup-patches) C  c3 h& m( F, ]4 t& Y8 k! b* n
  ;; initialize the patch-owned variables and color the patches to a base-color: M( i0 c: m+ y
  ask patches
" V9 G: z( |8 x  [
4 Y& ]4 r+ C9 r    set intersection? false
% U2 O' E+ R8 ?) l9 e    set auto? false
/ o' f( `6 L- K9 n. ^4 {3 g    set green-light-up? true
0 p. A" R1 @% G; T0 c. x9 ~    set my-row -1
- q7 G5 _$ ]) P2 q. W* d# r9 V* |$ i    set my-column -10 ?5 Z, j8 ?" }( t; X
    set my-phase -1
7 Q- C9 V) M8 R. Z# C7 X# k    set pcolor brown + 3  Q4 V6 R  q( \% T% @
  ]
, i) L$ r# j; j$ b8 _! h4 w, Z2 T1 H
  ;; initialize the global variables that hold patch agentsets* _! `2 o2 O% d: h
  set roads patches with1 e. ?) i; H9 a! ]. w
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
7 j* K0 x, e  O$ ?6 ]    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
) O( }6 D6 F! d7 R, j  set intersections roads with: P& j' }6 x7 I" P3 \# G. y) f6 W! Q
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
/ w& e3 _, H) I7 J; c7 k    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
! t8 w8 u1 E( y. [1 P) \
1 H4 r6 @* I1 C  ask roads [ set pcolor white ]* T4 G1 K" M. j/ a  |2 D1 `
    setup-intersections5 g0 k1 w: L) N% `; ?8 T' p
end
4 {3 r- M0 [* k其中定义道路的句子,如下所示,是什么意思啊?
. Q$ O  p6 Z  a9 {  U set roads patches with9 e: Q- i+ Z& f8 U  i7 L4 ?
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
9 W; b, a  W) V: W; E4 q! _* r4 ?    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]# n9 p0 \, D7 w3 k& {
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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