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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。
0 t* A- J9 f5 U' K/ Lnetlogo自带的social science--traffic grid这一例子当中,
1 Z7 K( |8 s9 k& F. Y* T  Iglobals2 w  ^" w) g1 x" Z! s: [, F5 p
[
' b2 K' G7 a! f$ R  grid-x-inc               ;; the amount of patches in between two roads in the x direction
9 I% k- Q# p. Q2 a3 b  grid-y-inc               ;; the amount of patches in between two roads in the y direction
. Z4 m* Z' r6 P1 R) z9 a  acceleration             ;; the constant that controls how much a car speeds up or slows down by if: C" W5 P2 @3 @
                           ;; it is to accelerate or decelerate
) T) _- y) [3 ~" G) d  phase                    ;; keeps track of the phase
0 w% _  t- {+ `0 u% Z. S. U, J  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
. z  V: |* `6 @6 ^! l" ^+ U0 r  current-light            ;; the currently selected light
+ b3 }8 Z1 z4 b
% P) U  Y2 ?" ?$ m" [  ;; patch agentsets
# Q+ ^! J8 \& o# q' ^. n  intersections ;; agentset containing the patches that are intersections
3 A. g4 i, S2 E* _  roads         ;; agentset containing the patches that are roads8 t* C9 S, b; v* ]
]
0 \) `! _! r' A. M+ [8 |
6 l) G4 O% g) H5 ^turtles-own
1 s% r2 {. x6 ~[$ H+ c0 U2 |) J2 C- H
  speed     ;; the speed of the turtle
1 Q8 e3 u7 D# m; @7 _" [  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
6 p5 A7 k- v- E' ]  wait-time ;; the amount of time since the last time a turtle has moved; ~, l! Y$ r5 A
]
; }1 a. ?- H) Z3 V  w" O' L  P4 m, z6 j; y% G+ R% N/ s% t; g
patches-own! a7 t3 D' E* w
[8 V% p/ A' o- n" A, P. {
  intersection?   ;; true if the patch is at the intersection of two roads/ _$ ]4 D4 W) Y) g) q5 M9 J/ E& a
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.: _- y# d' h4 {( I( K
                  ;; false for a non-intersection patches.- H8 g* w$ y) L9 Q3 G( x
  my-row          ;; the row of the intersection counting from the upper left corner of the. D9 e  R. r& b- O
                  ;; world.  -1 for non-intersection patches.  _2 p  e& X! t5 ]; T/ B3 o* B% r, }  M
  my-column       ;; the column of the intersection counting from the upper left corner of the
. f; |" k$ v2 O) w8 m' d                  ;; world.  -1 for non-intersection patches.' c2 _  f1 `! M7 N" |* U
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.4 V: V" M: f( P9 K
  auto?           ;; whether or not this intersection will switch automatically.- T5 Y0 f' B+ U2 C5 K$ s
                  ;; false for non-intersection patches.2 m9 Q7 Z5 O) x5 S0 p
]8 X! V5 C7 h. v( X

, q+ ~2 g4 g1 n3 b5 U/ o
& H. u0 C" ~- d;;;;;;;;;;;;;;;;;;;;;;' Q5 F& s/ v& k" x- u# S
;; Setup Procedures ;;' f' v: T! o3 e2 F% @) `
;;;;;;;;;;;;;;;;;;;;;;
& z+ \/ w5 z; `! O# ~" o* q8 j
- x- w. H$ u9 G9 ~3 v7 s;; Initialize the display by giving the global and patch variables initial values.+ R9 ~1 e& P3 u7 C$ E
;; Create num-cars of turtles if there are enough road patches for one turtle to7 Z' w3 x( a3 p5 g, N7 B( u
;; be created per road patch. Set up the plots.
2 C: D6 w" H) A2 pto setup$ X( }5 [) U4 K' w
  ca. h" q2 g  X' ]1 F  \
  setup-globals
- G( h. v. W' _$ a! p; @$ V3 G6 Z  R: F8 W, v
  ;; First we ask the patches to draw themselves and set up a few variables, z& F( U9 a$ a8 _3 D+ o
  setup-patches* L  y4 B7 x2 h* k6 g$ z7 X8 x
  make-current one-of intersections
& Z2 Z+ J. i  R# n  label-current
; w- l  h- l  p% Q0 g- Y# U8 t
  set-default-shape turtles "car"
. X4 {  S/ j6 v$ q* o( O
4 x, O8 e% o7 _7 f8 z  N  if (num-cars > count roads)/ u2 s) {4 ^# O4 J% L8 ^) l
  [
$ w+ w# d" Z$ _; `    user-message (word "There are too many cars for the amount of "' `) W% u% i6 s1 K
                       "road.  Either increase the amount of roads "2 C) r! F6 a* I" ?
                       "by increasing the GRID-SIZE-X or ") Q( T% s7 F4 T' w
                       "GRID-SIZE-Y sliders, or decrease the "
  l8 i7 b& H, h                       "number of cars by lowering the NUMBER slider.\n"# o& j& y+ \; Q. c( `4 Q8 W- h: h
                       "The setup has stopped.")$ F$ ?' u/ ]7 U$ x5 w) P8 U
    stop
( `. r! q2 ~- p4 r9 I3 ^  ]6 I: D3 M" r% J7 Z3 z

" x; B) |9 z, d  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color$ J, q' j: l5 ]* N, D8 g
  crt num-cars
! w; w6 D2 i' q' p  [
' k, G, \4 A1 E; T( y    setup-cars
/ C  D7 @6 ~6 c    set-car-color
+ j" A. T, x- c* t    record-data
( k: n0 h' C) R* J  ]9 Z5 [# K# O: a+ w) e4 D& ^, }

- S+ _% S% _2 v8 D: R, T- I, {  ;; give the turtles an initial speed
5 i2 ^* k. Y) D3 z) d  ask turtles [ set-car-speed ]
$ G3 l; D7 w) F5 q7 W$ j. `6 I$ c9 J+ U* m6 o0 o# P
  reset-ticks
" v3 s- @2 f, U, Y1 Z9 Eend; G) e9 v: f' l6 ^
6 _9 S8 ?! e. l: \  C9 ^+ Y
;; Initialize the global variables to appropriate values
, ^( E& O4 F$ y- _4 r+ Hto setup-globals
7 ~; Q+ s; i$ }# m( H  set current-light nobody ;; just for now, since there are no lights yet
5 [8 o4 O- O# e* L' j  }9 U& [  set phase 0% y8 Z- w' ~1 S# \
  set num-cars-stopped 04 e' ~3 M* B" `' }, W4 o
  set grid-x-inc world-width / grid-size-x
" m: g6 c1 W( M5 z) g+ ]7 K  set grid-y-inc world-height / grid-size-y9 M  M9 v4 x3 p% g2 N
" e3 L% M' Y; g' m* q0 ~) e
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
3 L7 o1 k/ V( a% G' r  set acceleration 0.099
% [- I) m+ ~, U( `, c6 Hend  Y& x9 Q; H& y% M' M7 [
7 E1 i6 l9 u5 r, ]* N& V/ U
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
) x1 I1 M* n  h2 |, ?) X( @;; and initialize the traffic lights to one setting
  V8 Q7 ?/ o( B  J6 ^2 N! Dto setup-patches1 ~# d7 h4 X; X. R
  ;; initialize the patch-owned variables and color the patches to a base-color: R9 z  Y# M; P7 z
  ask patches
9 `7 z8 W+ |. r! j3 e  [
0 U' J9 ]& i6 Z5 L4 `    set intersection? false: }- {& z4 u0 e
    set auto? false
5 l6 V4 g- y6 o8 T* U    set green-light-up? true- v% M# V1 F' d# f
    set my-row -1
$ r9 s7 ^5 N2 {  Y% v" P8 B    set my-column -1/ u+ ?3 d! s9 v" b
    set my-phase -11 Y$ I& c$ a- X* |# u' T: j. a
    set pcolor brown + 3
3 m: W# K( {' p  ]
1 H2 f- s0 d# n
$ U! Q# f' E* W* L! s! M2 X" f6 B  ;; initialize the global variables that hold patch agentsets
7 T- B+ k0 w+ f* N/ R. ~  set roads patches with
- u& _# p( T- x8 O' H    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or) g! v$ q; H3 z- ^* p
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
- F. x* Z0 P$ `5 \; H+ g  set intersections roads with
1 N9 O: b% |; c    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and0 W9 l, D$ ]2 T
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
; f9 s9 ~. f) X/ b- @) @6 i1 \( G+ n( p- j  e6 B* ^" B
  ask roads [ set pcolor white ]
" H# `1 P: e" H2 c' z* u    setup-intersections
; v9 |7 r7 y* d( Jend
5 T3 H! n2 h) R" R, O% z4 F其中定义道路的句子,如下所示,是什么意思啊?
4 P$ ^- W, Q4 u" y% m, v set roads patches with
4 n- ~& V. R: V, W7 A    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or* x$ |: H  ]9 ~' z" i  q6 M  t- z4 A
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
: X* a! p4 R8 e) O( {) T& L/ 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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