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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。
  A- D# R: H- T5 Tnetlogo自带的social science--traffic grid这一例子当中,( X1 ]7 {" w3 b
globals  B- R( G5 W# h
[/ d8 H3 |/ w, }1 p
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
# v1 L8 ~9 j7 Y6 w+ B. Q" k" K  grid-y-inc               ;; the amount of patches in between two roads in the y direction/ u+ R6 R5 ]3 j& i: p, g
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if, h9 ~, H) H9 C5 A& e0 X
                           ;; it is to accelerate or decelerate( B! W/ S) ~# {  Q  L" F
  phase                    ;; keeps track of the phase
- p+ `1 d3 E  ]* L8 |$ x4 p" l. ]  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure/ w) S# Z' W% Z) v! _: c
  current-light            ;; the currently selected light& k, h5 L) x) O. {4 B$ u  B4 e; S

' S8 l/ Y6 x1 P! E, p  ;; patch agentsets
4 t; e- Q7 l9 @( e# U) H  intersections ;; agentset containing the patches that are intersections; {$ Y5 w0 t: C+ y
  roads         ;; agentset containing the patches that are roads2 X2 c% ~: Z. f5 }
]
! B! y  @& N, `( k' z/ X$ ~" i9 o8 D6 T) z- V2 A
turtles-own9 z4 N6 i5 x/ @2 F* R& p
[
# A* P' t9 q' j9 H9 ^' |8 e" x% u0 l/ `  speed     ;; the speed of the turtle
& X: I. G) ~7 p4 e" S  up-car?   ;; true if the turtle moves downwards and false if it moves to the right' q8 m+ H& b# g
  wait-time ;; the amount of time since the last time a turtle has moved
4 x/ {6 P' Z& z& Z]
4 o% v) W0 b" u7 a' `  ^9 T" k: k3 I! [; f& W! g. i5 e
patches-own
. P6 {3 b2 A- _8 n8 c[
; T6 T) x( z& [, T7 n  intersection?   ;; true if the patch is at the intersection of two roads4 A: R, q" W9 h
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
, k% D' u' l" R0 l                  ;; false for a non-intersection patches.* G* y! k" l+ C, r% B: j
  my-row          ;; the row of the intersection counting from the upper left corner of the
, |) J% h9 Z+ _3 ?2 e/ [- |                  ;; world.  -1 for non-intersection patches.+ V; D4 g$ n- O4 @: e( i
  my-column       ;; the column of the intersection counting from the upper left corner of the( w' V5 Q1 P5 o/ c- W
                  ;; world.  -1 for non-intersection patches.4 M! a: @3 D: F3 {% N$ g$ e( x. J+ Z
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
6 X0 H3 D( C! l4 G- ~. E  auto?           ;; whether or not this intersection will switch automatically.
" {' R- R2 a9 w5 s5 v" C                  ;; false for non-intersection patches.
; e+ O% ^8 o' v! }8 o% R" a]4 E" L$ M3 W; b+ {

& }5 H7 I: w& a+ ~- L9 A7 G  x( v- a9 y3 O& Q' a
;;;;;;;;;;;;;;;;;;;;;;" ~' O8 Z$ g; c- V/ |1 d( F
;; Setup Procedures ;;
# z9 s/ m3 X8 V6 J" o  `;;;;;;;;;;;;;;;;;;;;;;% c, |( m5 M% V3 E
' R2 m# K& x! B$ w# }
;; Initialize the display by giving the global and patch variables initial values.7 ?) e, O0 a: \* ]% |
;; Create num-cars of turtles if there are enough road patches for one turtle to
9 ]0 D4 a/ L. l: e  t6 V7 p;; be created per road patch. Set up the plots.
) y2 e7 _, g2 F  M! fto setup/ c8 q) _, G" Y4 V
  ca/ f$ w7 L0 m6 |( ~
  setup-globals5 Y- o1 \; n& Q$ G/ J
+ G8 ^9 [5 v4 I% S( }  Q. y! w2 _
  ;; First we ask the patches to draw themselves and set up a few variables- z; C2 x/ U3 a( l8 B, T) e, J5 j( P
  setup-patches7 `. e: Y- L7 T* _+ V
  make-current one-of intersections
+ Q! h  P6 p+ X' I3 o0 v8 l  label-current
$ N. F! ^2 \: n% y" ]7 U9 c9 B2 ], U0 D3 W
  set-default-shape turtles "car"
* w& f! w. Z- t% L# ]
: p7 r' O$ a* x9 Z4 r  if (num-cars > count roads)- _5 T' v6 W8 Z$ X: k( n
  [
& E' |  X/ J" r! t3 |% m6 w8 p    user-message (word "There are too many cars for the amount of "/ d6 }* y8 P& T. j
                       "road.  Either increase the amount of roads "
, w- K0 G# |6 z$ E/ m4 |! p                       "by increasing the GRID-SIZE-X or "
9 _. i) q2 O8 P                       "GRID-SIZE-Y sliders, or decrease the "
2 Q  [( W$ q% a2 R0 m                       "number of cars by lowering the NUMBER slider.\n"! ?+ b3 Q; R- u* ^5 Y' C
                       "The setup has stopped."); ]4 }. d5 Z" q) N
    stop3 ?3 f6 q; @& z, B3 {
  ]3 A* c+ u# v5 r+ h3 G& j3 i
# k" \3 S" ~4 u
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
" O, ?5 g+ r0 f- @. s% A8 v, d  crt num-cars! Q4 V# }9 m0 X8 t6 z+ _
  [9 R2 O. d2 i; `
    setup-cars7 ~; a- C2 ^9 L: Y2 d
    set-car-color" G; j8 H% D* G3 E) o4 S
    record-data
5 i- l! k' s  y( ?) ~; A  ]
+ n/ p* f: m! }! z; `# i5 b; F. r: X# Q
  ;; give the turtles an initial speed
* B7 q( ~9 j+ F! `  ask turtles [ set-car-speed ]/ P) P. h. O, W; V

3 u% @6 J6 y+ }. r* N+ W# a  reset-ticks: A& r- k4 K( r
end$ s* j5 t1 Q) R' V5 E

1 C' x& U& c: s& s) u% x& q;; Initialize the global variables to appropriate values
8 \0 _' J8 g, Y+ }$ pto setup-globals/ S) X6 e. J3 y6 U. o- Z3 l
  set current-light nobody ;; just for now, since there are no lights yet
; r7 I7 _5 X7 K& a  set phase 0+ ^4 K5 `; p, C/ c
  set num-cars-stopped 0% _& `$ C1 `0 H7 I- s
  set grid-x-inc world-width / grid-size-x" b8 M3 h/ f, u: C
  set grid-y-inc world-height / grid-size-y+ s; \  |8 v. k) M: O) U9 e& Q
& X  i+ Q4 l8 t, i9 ]) n. ^3 E0 d& o5 }
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
6 I0 K# v0 r' S% H. n# f  n  set acceleration 0.099, b, j; n/ s( p+ _( l
end" I% o- m( q. d- l3 B

1 ~! E, t% `1 N" U! ^( o;; Make the patches have appropriate colors, set up the roads and intersections agentsets,5 {/ c# R$ T: K) K- \# g5 C% i& \
;; and initialize the traffic lights to one setting. G+ U. H5 `1 x2 W+ b! N$ e
to setup-patches
+ d7 e3 E  N5 X1 ]4 p; _  ;; initialize the patch-owned variables and color the patches to a base-color
! g* X* v7 t! u' s! ?6 F  ask patches8 `% f0 L+ D  x8 m$ x% M, B
  [; W6 ]) {4 i$ p7 b2 P6 b' K) `+ [
    set intersection? false
- I- d1 M( A; `6 M' W: q    set auto? false: `- S# i2 n7 @
    set green-light-up? true6 S  Q& C/ X$ m) R9 Q" |6 L. n
    set my-row -1
4 ^) Q4 }4 X% ~  @9 D. \    set my-column -14 }  u" {7 x: W
    set my-phase -1
6 p2 ?- |& C8 y) p3 ]: J# E5 U& M, x0 c    set pcolor brown + 3% P& `9 i! h3 |2 F
  ]
- C2 n; H: w; K- }" F+ G( V  F$ o3 z! V" r
  ;; initialize the global variables that hold patch agentsets! g' v9 v* P9 s
  set roads patches with
1 {1 L2 z: v* o    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
/ l# V+ n% ]" u; K5 r' X  _    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
6 N. I) q# C, U9 K+ C7 t* B3 g# f0 x  set intersections roads with! `! N' e. c& i" _# W6 a3 g
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
' ~  u+ N6 m( G; @    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 o8 Q; A- j# h% C

- v0 H1 ]1 p; o/ d5 j; V  ask roads [ set pcolor white ]& V1 p! z6 ?/ j) L
    setup-intersections7 e  ]; K3 ]9 B4 f6 ]
end
# U+ v! n4 Y3 d- O  t% G其中定义道路的句子,如下所示,是什么意思啊?
5 g" P2 `7 O% A  |! G0 H6 F set roads patches with
1 l9 t# k9 g- j/ t3 J    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
" I. @) n9 l! Q7 A! C    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 P% c5 G( l& U! |% ~. X! 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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