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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。
3 X' Q# ]5 k3 y. s/ Dnetlogo自带的social science--traffic grid这一例子当中,; |% w3 |! H7 n% j
globals
5 t: F: \; v. ~6 p. ~+ q) B7 w' C[" D( T" T5 m2 Y/ l  \
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
2 e) D8 x8 D8 N  @; P- s3 I' A  grid-y-inc               ;; the amount of patches in between two roads in the y direction3 r, |' z: a% P4 J4 A$ r
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if, ~" M2 o$ X2 d4 s- D4 u
                           ;; it is to accelerate or decelerate  i' V6 |- B" n0 l8 u* _
  phase                    ;; keeps track of the phase+ g. w, x! X9 k/ }8 z" V
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure' F8 V. K/ w& l4 d% {  c) n9 W
  current-light            ;; the currently selected light
& o- E9 L8 }2 ?1 a  l7 w$ D1 X% C, p3 a- q6 R. I" o
  ;; patch agentsets
2 u8 N2 D1 ^. I# L( N  intersections ;; agentset containing the patches that are intersections
+ k9 w; Y; y! `: t* M  roads         ;; agentset containing the patches that are roads" I8 F! A4 f$ l/ g0 Y$ O
]6 E# F/ p8 O" K! j# q" B
" d* S5 D# y4 ^( t0 ^: d
turtles-own
0 z: p' F# b1 b2 z# V[# G+ _* ~* N5 N: m* h  s
  speed     ;; the speed of the turtle6 `" F  W: F4 k6 C8 U. x
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right7 ?8 V) x, k: g% B6 x0 Z* r
  wait-time ;; the amount of time since the last time a turtle has moved
& [; h' p. u1 Z]5 g: X8 O4 W  z- {# s* b, l. i
" r( C; y# r+ _6 `* f" \+ f
patches-own
5 V2 ~0 o6 w) g! [6 G1 D& U3 O[
3 G9 N$ w) @+ `  intersection?   ;; true if the patch is at the intersection of two roads
1 @/ V7 W5 J1 x5 [! \/ g! g7 V: m  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
* m4 ^4 ~' e& }# @, P+ f2 {% w                  ;; false for a non-intersection patches., r9 Z: l: v4 D( `8 e7 a& o0 {
  my-row          ;; the row of the intersection counting from the upper left corner of the9 g$ w( V/ N- s! a
                  ;; world.  -1 for non-intersection patches.1 a. b9 x8 j- m+ B; V6 C3 |7 {( k
  my-column       ;; the column of the intersection counting from the upper left corner of the
0 Z& E' N* H- Z$ x$ V5 l/ D                  ;; world.  -1 for non-intersection patches.
9 V( n* w1 _* `1 z! B8 n  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
5 q4 n) B4 @6 ], S  auto?           ;; whether or not this intersection will switch automatically.
* Q9 U; t8 N+ k( m' A1 L                  ;; false for non-intersection patches.
; Z9 r) Z0 r& Q" I  S  T]
, f0 W9 p4 g, B* l! w/ a, i" }, P" s4 A

8 T4 P, }9 F& W9 r9 N;;;;;;;;;;;;;;;;;;;;;;
" s: x( o" L7 A* X( a;; Setup Procedures ;;/ }* ?* T3 M( f8 P# O% y  Z3 {8 M
;;;;;;;;;;;;;;;;;;;;;;
, ?3 M* ]4 k" k$ C+ m" y7 a- T/ r% W- z' a; w' ?+ I
;; Initialize the display by giving the global and patch variables initial values.
3 \/ ~. Z5 O$ E" ?1 q! K2 {;; Create num-cars of turtles if there are enough road patches for one turtle to% q8 X) l  N7 v1 X/ F' J$ H7 X
;; be created per road patch. Set up the plots.7 h, H8 q' w/ p
to setup
( P% \6 `" {4 k( E  ca
6 C8 G9 o5 b' O; m+ ~  setup-globals
* A, h; \/ K' ~* C7 M/ B( z6 X
1 X- x% b0 b/ c$ d0 N  ;; First we ask the patches to draw themselves and set up a few variables
6 d; H! X: z8 U  setup-patches
& d" T! Y: g, Z  make-current one-of intersections$ X: [) i+ A% y$ y- M0 Q
  label-current
% M8 C' m8 A! k, U
3 p# ~, h  l8 y' A, M8 x6 t  set-default-shape turtles "car"
  I* n. N% S) w; X7 ]& t1 Q3 ~
$ M7 B: a$ O0 t; l2 B- Z  if (num-cars > count roads)- ]% G% @/ t& K, ^2 f/ {. M' \" y
  [( g- L! \7 }5 p0 Y8 K& M  x. w
    user-message (word "There are too many cars for the amount of "
  |9 h2 n  j, t1 R" U                       "road.  Either increase the amount of roads "
. s, k9 t1 @$ O  D( [. i                       "by increasing the GRID-SIZE-X or "
  o  N7 v8 O8 H/ n                       "GRID-SIZE-Y sliders, or decrease the "
/ u* ^% X% i# N$ u1 Z% c3 ~; |" f                       "number of cars by lowering the NUMBER slider.\n"
, R  `9 s. ]7 L5 `                       "The setup has stopped.")
6 h" J, ]/ n8 a% M+ q$ Y    stop/ h  C' I8 |3 U5 M' a7 C
  ]
! `0 f0 A: o) H# k/ P2 x
4 i- ^& y! u& g$ o! o  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color* p. ?* F- Z- M4 b& h$ j' O
  crt num-cars/ E& h- ~( }9 L8 z
  [
% R) y2 ?% @5 e: p    setup-cars/ g2 a, v6 j8 f4 k- b
    set-car-color
6 A# L, _2 Q, M/ Y    record-data0 z) Y2 H% y& d( @2 O
  ]
1 }4 A/ E! L+ H2 _, p. C. @6 ?' A0 m
  ;; give the turtles an initial speed& C9 F! _& S- g9 H
  ask turtles [ set-car-speed ]% G; }3 g% [. j+ ]. w9 O
' g# o6 F4 b1 c
  reset-ticks5 X& `1 B* v4 |& Z+ f
end
' I; T! m3 u* t( N* o* r# j. ^
2 \3 n6 h( g+ a6 Q;; Initialize the global variables to appropriate values
) v: }$ \% H# G1 R6 }to setup-globals8 s9 ?, p6 |4 G% }) A; i
  set current-light nobody ;; just for now, since there are no lights yet. l, N+ }9 _9 N: K8 u' V3 c$ W7 I& b
  set phase 0
& e: J  ^2 @  w4 E4 |6 g- b  set num-cars-stopped 0
& d, m# w, {5 k  [# ]" J  set grid-x-inc world-width / grid-size-x
1 S9 b, L# U8 I; K+ \8 Q6 F0 G  set grid-y-inc world-height / grid-size-y" g1 K6 @# [& n% U6 D. x

/ i! {& t  b$ A( E  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary7 |6 t. O1 C& V; V  I8 E7 s; L
  set acceleration 0.099
$ X3 y! I' D2 uend! Q( |; \2 p, R: l9 f4 s6 R

& o' O6 q$ f' z$ l: o' S;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
; |5 m3 x8 [; I: `4 p1 ^  ?;; and initialize the traffic lights to one setting6 m, ~) Y5 K# z( U* {2 p% j2 u* D
to setup-patches; L8 J! \+ P8 a! }& ~: p
  ;; initialize the patch-owned variables and color the patches to a base-color8 y8 T7 n5 k  A- c* ^
  ask patches
5 {$ D8 G6 F2 U) i# y2 d- }6 J  [/ b$ f/ E, f6 b/ D; n+ h9 q/ s
    set intersection? false
, `+ F" t4 d7 }$ O6 c7 d1 z. A    set auto? false3 T3 p/ U3 L) F, f
    set green-light-up? true
: x4 d0 ^. a6 P2 Y% A    set my-row -1) s8 S1 q7 P' W0 P7 i) Y# ~' b  U
    set my-column -1
7 m3 u" l, U7 j) |3 }    set my-phase -19 H; A7 ^# V6 i9 B$ ~
    set pcolor brown + 3
' ]4 Y9 T9 b4 L/ S  ]! o/ D& ]5 j9 O4 N# Y

; g; z$ p- _0 G% s( J4 Q, @! ~  P! s  ;; initialize the global variables that hold patch agentsets8 A: j5 _( N8 e  X% A# M7 O" X5 X' |
  set roads patches with
+ y% t: O8 U) X1 L3 M+ f( B    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
. S+ E. p1 Z. R2 ]: l    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
! U& g0 S; ?2 t3 R  set intersections roads with
! u0 g8 ?2 F+ M    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and$ @% W, t* k% A2 I
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]4 R1 N0 c0 X# P; e
2 L- l3 }) D) o7 P- e7 F
  ask roads [ set pcolor white ]
& m6 f7 B+ i* d7 s7 j1 y    setup-intersections
' n3 t0 H0 P$ b) c5 M# ]# Oend
& w' z" I) @* W0 j( }& y其中定义道路的句子,如下所示,是什么意思啊?9 |$ c3 B; J7 o+ ~+ c  _
set roads patches with+ O* t: o" n; C4 @/ d# Y
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
% y% H+ Q/ f( T    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]* t6 ]' B, B7 l% U5 Z$ i
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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