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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。2 P# ]9 U; u* ~- \- N
netlogo自带的social science--traffic grid这一例子当中,& Z( p4 Z! z7 G6 m
globals
+ l% I0 j! W  P, u6 _3 M, J$ b[; W% n4 y" B9 q8 w8 z5 |6 J
  grid-x-inc               ;; the amount of patches in between two roads in the x direction% S2 e4 L: P9 o2 ^
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
/ R- p$ u- ?- A7 @  acceleration             ;; the constant that controls how much a car speeds up or slows down by if# G7 x/ B# y" u* |2 J
                           ;; it is to accelerate or decelerate/ V% z7 z3 \& f" }
  phase                    ;; keeps track of the phase% L; c1 Z7 e7 @* a+ ]9 y
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure5 K( K' c6 z1 z4 i" c7 S
  current-light            ;; the currently selected light
* h: l# o' W% |7 S' r6 ~% M9 g$ U0 L
  ;; patch agentsets- b1 Z3 O1 e9 S( I) ^8 |) C
  intersections ;; agentset containing the patches that are intersections
. b; m+ t. U% T- ]. Z. b  roads         ;; agentset containing the patches that are roads  d6 d$ t* O' C9 M4 S4 L% j: }0 Y
]
$ W% |7 F" @' Y: R3 E1 n: z& {' d: v$ z+ U/ ?9 X
turtles-own2 p" s& a6 p/ {8 [: Y9 `9 A% y
[2 G) B* N) h2 n" {7 w$ N7 Z- g
  speed     ;; the speed of the turtle! q4 z4 G1 H9 o0 l- E
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
& R* a6 x, e5 A' O; N( Q7 `  wait-time ;; the amount of time since the last time a turtle has moved
" Y+ a" A( X/ D! P% k+ [# d( s]# r4 _* ~+ N- t7 w$ }
* o/ E9 ^5 M/ K
patches-own% `7 P) m' q6 O8 M
[
3 _4 [" a+ I( w* V  intersection?   ;; true if the patch is at the intersection of two roads
2 Z( L0 P! B! b& x7 w  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
2 y- T& K& a  P( f! d* s                  ;; false for a non-intersection patches.
$ }' D( y- K% s  my-row          ;; the row of the intersection counting from the upper left corner of the  n- \/ A4 b' }- a7 L$ _) ]
                  ;; world.  -1 for non-intersection patches./ l1 s/ q5 s% w- k: E
  my-column       ;; the column of the intersection counting from the upper left corner of the7 C! J+ i9 }# M% a: M/ X
                  ;; world.  -1 for non-intersection patches.
$ E/ w) O% X3 Q* G% E( ^  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
" a! m* ]2 }1 [- I' Y  auto?           ;; whether or not this intersection will switch automatically.. N: i& w% Y3 o6 J$ y/ H5 M4 A
                  ;; false for non-intersection patches.; J& O6 n, m8 `2 \. J7 K8 `
]
% M0 k6 ?$ x! o* g7 q$ k/ B4 K4 @! K/ v$ R0 m0 a5 `
7 \9 W' p+ j  B+ g2 g
;;;;;;;;;;;;;;;;;;;;;;7 i2 M; I2 J6 T* V4 W3 s( E
;; Setup Procedures ;;: h/ ^" P7 \9 ]/ O' q
;;;;;;;;;;;;;;;;;;;;;;
# O. q  F! W+ w: ]" u  F
( a2 O" r$ G/ [* N, g' G$ C;; Initialize the display by giving the global and patch variables initial values.
: d$ y3 S: v# e;; Create num-cars of turtles if there are enough road patches for one turtle to/ N% V6 x2 U, H- r/ h7 O
;; be created per road patch. Set up the plots.
# ]5 \1 r" D( E) x3 {" i8 y) Eto setup
7 H! A, R4 t+ R4 {( Q  ca
4 P; H( N7 b- B4 e2 }* f- @  setup-globals
( I: A4 v& @* l/ M* m( L
; [% O0 X+ }" b! P; D9 A7 S& C: C* Y' g; d  ;; First we ask the patches to draw themselves and set up a few variables5 q* ~+ l; l. R9 M+ b
  setup-patches- q+ D' p; i7 u( t: J0 G/ E' Q
  make-current one-of intersections
: q7 @( N' j. L( h" b/ N4 ]2 v, K  label-current8 i; L6 p& @4 L
) m. [* q( M; ~( |5 t
  set-default-shape turtles "car"+ r: j$ j# P! `7 h% {/ `# x, h2 ^
* @! M0 v; g0 r7 }& @4 X3 s
  if (num-cars > count roads)  P/ ~) d# {' m
  [( I/ j2 L) h0 S
    user-message (word "There are too many cars for the amount of "0 [  P, m$ }5 ~  [8 ^  x
                       "road.  Either increase the amount of roads "
. |& S; p, ~5 Q& e  m' t# b                       "by increasing the GRID-SIZE-X or ". g2 G& n& ^- K6 L3 u
                       "GRID-SIZE-Y sliders, or decrease the "4 r  k9 }8 A8 B1 V; Y7 S8 C
                       "number of cars by lowering the NUMBER slider.\n"
% v% O8 i0 w- j* t: t$ A8 @                       "The setup has stopped.")
2 I% [( G3 a* T- `8 ~    stop2 }3 ~, E1 f7 B* M! D0 W2 J  n
  ]3 F  [, W" @4 c' Q' x* g8 g

1 S) \: e/ X0 B  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
, @3 s' F8 a2 q$ ~4 i  crt num-cars* n+ Y+ I  Z; p+ K
  [
. G* M* l- r$ d6 w  d0 L6 i% O+ w    setup-cars
) _# }, s! {6 z$ g  o    set-car-color
8 `9 v, T1 k. Y/ l* M2 L    record-data" [( f7 d5 R/ t1 o
  ]
. S9 @4 {' C/ ^8 f- c7 Q$ G& |' D8 e: s  ~2 v& H
  ;; give the turtles an initial speed
" s0 Z4 H, T' d, x  ask turtles [ set-car-speed ]8 z' }6 x3 W  h9 R

, l; T" e( V" ], {5 N  reset-ticks2 ], L" n: y# B6 N
end6 p6 t9 n6 v& Z7 t; n: {

/ v. z$ H5 S/ ~2 H; D' Z. R/ ]! \;; Initialize the global variables to appropriate values7 m0 ?: u" N; J% S2 i
to setup-globals
  k* M7 s# \1 D5 V8 g  set current-light nobody ;; just for now, since there are no lights yet# d4 n# G8 a9 d$ _# [+ k  d3 V. h
  set phase 0
$ F& W  V0 O) b" Y: d  set num-cars-stopped 0
* \/ C7 t6 p% j/ n6 g8 e0 Z$ K3 w  set grid-x-inc world-width / grid-size-x0 y' i6 i8 Z. A, ^& n8 g
  set grid-y-inc world-height / grid-size-y, j8 }' f: g# h9 R/ e/ R' Z6 v# W
# _, O: J, k9 m( r, w! g
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary# c1 v/ [4 z$ {  C
  set acceleration 0.099
! Y2 Z0 N# K) U9 r9 a, a$ }end- \" D/ C; O) q; d7 S& q5 \
4 T3 ^% T) Z; T. W# h
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
; E7 s0 |# V9 E;; and initialize the traffic lights to one setting
% u! m8 J7 b3 A8 vto setup-patches
! B& E( s, `/ f  ;; initialize the patch-owned variables and color the patches to a base-color
0 x) m. U  p/ x9 M% f  ask patches! y7 S5 T5 k" ^
  [9 H" E7 i6 h: f" ~0 j6 M- R- I+ b
    set intersection? false$ f, L" ~2 v# |" M1 w
    set auto? false, Y6 l( ]2 }# n, q
    set green-light-up? true
) H. X# X6 K/ ~# ^    set my-row -1
5 T* P3 _. f  r2 J) C' A. c    set my-column -1
7 m$ d# S0 Q$ s4 `$ L$ @    set my-phase -1
3 I* ^% N9 h9 B- N9 T7 @3 r$ U7 W    set pcolor brown + 36 Q5 C: n5 k, G$ S9 U' O) X. t
  ]5 y" c  m, c$ Z: F6 ]

2 z$ W2 F; D5 O1 h0 W% r- d  ;; initialize the global variables that hold patch agentsets
7 N1 h7 F7 b" M  set roads patches with
& F9 E5 c0 ?6 p% b- v2 P. d0 M6 G    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or/ k; ]3 F7 T9 N# Z( I+ h9 t
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]  X: Z4 O3 X" L  J1 l# S6 x9 _
  set intersections roads with
0 R6 p% R) Z/ \, u    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and) I6 R4 n6 `, W
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
# w. Q, b) j& w5 i/ ~3 s( Z% g7 y, L, r
  ask roads [ set pcolor white ]
" ^% I5 ]8 T* y" y    setup-intersections- I$ Z# E" l6 J& N  k( ^- w
end
. N+ ?5 d$ s- X- M, N其中定义道路的句子,如下所示,是什么意思啊?" @/ w3 r- `# C8 N8 f8 P. k
set roads patches with" S, _8 W1 `. P0 E* v; s1 x; a
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or# |3 F% Y, e/ q+ M7 E, ]
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]2 T) Y$ M5 H0 Z& E$ |* D; D: p
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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