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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。
: z: {& b6 H* p0 }2 C' F" n* P6 |9 gnetlogo自带的social science--traffic grid这一例子当中,0 C5 ?: w) U( f+ n' N) P
globals, j0 U0 }/ x3 g3 I- a
[
1 @9 @0 ]9 z. ]& F, \  grid-x-inc               ;; the amount of patches in between two roads in the x direction
! w4 Q' H8 D/ v* J2 H  grid-y-inc               ;; the amount of patches in between two roads in the y direction" ~! O/ ^2 F4 m9 t3 B9 y6 _# {
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
7 y7 I+ t' U; a7 n                           ;; it is to accelerate or decelerate
. @; d7 S- @# m& ?  phase                    ;; keeps track of the phase
% C+ \, O7 c  f4 F7 s# a+ q7 k  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
1 e: N: h( [5 E9 P0 p  current-light            ;; the currently selected light" H/ P* ]. M" s+ L( [5 E: k
( e8 n6 A! l' B6 k! ~- n
  ;; patch agentsets
; r5 L) _% U# A% O6 b  intersections ;; agentset containing the patches that are intersections% N$ n! c! k/ M8 x7 r- a
  roads         ;; agentset containing the patches that are roads& }* W. l) Q. q
]
8 r, a+ S: W, ]
7 j) |+ E" I/ w, i9 j! xturtles-own
$ @. t% Z' v; i$ H, w[
9 H5 i& |2 v2 \7 }  \) }4 v0 O  speed     ;; the speed of the turtle
9 n, M$ a* c9 p1 N  up-car?   ;; true if the turtle moves downwards and false if it moves to the right' j  d6 Q1 i& q
  wait-time ;; the amount of time since the last time a turtle has moved
; p) Z; |* r- }! \+ C]& K9 L; X- x# s% \% M! P

, x9 j  R6 L6 Zpatches-own' i: ^  u9 }" h/ \/ j
[
" }* x2 Z3 d" Z) |  intersection?   ;; true if the patch is at the intersection of two roads
5 g0 l5 V" H/ S2 _  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
& M* C* X4 J5 m7 I: r                  ;; false for a non-intersection patches.
- v- j: G% F) s% e- N) u$ H( f2 ]  my-row          ;; the row of the intersection counting from the upper left corner of the+ G1 x% e! w6 C6 K$ k* O! m
                  ;; world.  -1 for non-intersection patches.6 l, i0 e3 d+ X, o, l+ h2 d( K1 `# g; ~5 t
  my-column       ;; the column of the intersection counting from the upper left corner of the
0 t* l% G( [2 Q7 q                  ;; world.  -1 for non-intersection patches.
, F+ z9 a4 p- |- I, }  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.2 m. M9 ]0 {2 R3 a
  auto?           ;; whether or not this intersection will switch automatically.6 ?9 x3 v/ e  d1 w
                  ;; false for non-intersection patches.
8 }$ ^7 Z# a( B0 Q8 a]
0 F7 c' s' Z$ s8 Q: M
& @! _) v# ?+ `" f6 l" `" M4 t* ]! Y9 K6 w
;;;;;;;;;;;;;;;;;;;;;;
! t# G; N/ S+ m. I0 U6 F, M5 n, l' };; Setup Procedures ;;
2 }/ z0 |* _2 l0 \4 v;;;;;;;;;;;;;;;;;;;;;;
. H: c; d! w1 E0 [4 `
' L1 P/ p/ h- p# ~! W2 Z* T;; Initialize the display by giving the global and patch variables initial values.
$ s5 k8 m5 H) @& B4 ]+ z;; Create num-cars of turtles if there are enough road patches for one turtle to+ K' |3 N' U' L; f$ P
;; be created per road patch. Set up the plots.9 H6 W' M- X) L$ |4 U0 f; _
to setup
2 E& [7 _: L: S7 F2 s( a  ca
- ]  C, f# Y+ D8 |3 L1 D  setup-globals
& I! R: o, h2 X' L9 G8 q& r- N% p1 {# V, e7 U
  ;; First we ask the patches to draw themselves and set up a few variables9 T: `6 _# x1 ^5 \; j
  setup-patches- H) Y9 Z' y" N" l
  make-current one-of intersections) T8 M" v% _* j; y
  label-current
1 J# ^+ I( q1 V. Z0 [, S' \6 Q- n' R0 n, ~0 G) L; T. N" L7 f% V
  set-default-shape turtles "car"
- }3 x6 \, z/ i8 C3 D/ T  z6 [" T8 O
' f! \+ x3 k* {3 a# y, Y  if (num-cars > count roads)6 w: V' X. w0 Y; z) j$ m9 c
  [& X0 j  ^+ V( d! }" G+ X5 j
    user-message (word "There are too many cars for the amount of "% U* q7 \; |5 o: L! k8 f/ G
                       "road.  Either increase the amount of roads "
$ \& h* m  }2 J" ]! F* X                       "by increasing the GRID-SIZE-X or "& k5 k0 d& ?7 v, k4 t
                       "GRID-SIZE-Y sliders, or decrease the "
; ^5 y/ ~. F7 C+ w9 ?                       "number of cars by lowering the NUMBER slider.\n"8 Z/ L1 A' e- f1 [6 g
                       "The setup has stopped.")% Z% D; W/ A0 Y9 L/ {0 P3 z, L1 P
    stop# O6 P& ?' @, p& G4 c- S. g8 D
  ]
9 _1 f8 f, u5 Y% l) L) ], o2 q3 r& P0 y. x
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color  Y4 W+ h2 M( J6 S1 i' g
  crt num-cars
# ^4 G: q9 h4 A# f  [
8 K+ w& ~$ ~$ d9 l4 m1 e8 O    setup-cars9 ^5 A8 l0 k8 \' r4 A
    set-car-color
! b# I8 ^& V+ L& T    record-data9 H6 @# ^+ A. I
  ]
! j* @9 z' q+ Z$ _" Z; L  y) E" p1 m2 z- O
  ;; give the turtles an initial speed' G9 N; G3 \- F" E
  ask turtles [ set-car-speed ]" X5 Q# t5 F  e) t# g
/ F9 K: {6 ]! m
  reset-ticks
. U0 D# O* o1 H  s8 fend
0 C2 x1 q* M5 G$ K( J, i
- p8 _& u$ j9 m: Y( e& ^" j;; Initialize the global variables to appropriate values
% }7 h3 a0 t7 h% [( Qto setup-globals0 l; y) W  Q. {6 t' M4 s$ |
  set current-light nobody ;; just for now, since there are no lights yet
" k! I6 Q$ _$ Y  set phase 0
' N5 ?7 {! f2 n7 N  set num-cars-stopped 0# j4 m  ^0 I: f6 M) @4 Y* ~
  set grid-x-inc world-width / grid-size-x. \$ v4 A1 `$ f$ l/ }7 I
  set grid-y-inc world-height / grid-size-y
7 c& ~9 m, Z  C6 k; G1 i' V" C
& u& D+ @0 Y, n! ]5 l2 i: h- T0 i  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary# B! {. z6 w1 [# B$ M" v
  set acceleration 0.099
! w" a; T/ ~  G+ b$ P$ rend5 C  ?# J8 z  S; {* u
0 u  b" D, ~# m! z
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,/ p/ r' q* G" D7 T- j
;; and initialize the traffic lights to one setting
3 [' x& p; }5 s3 K5 q& a% P4 Tto setup-patches- j; o9 P6 A1 Q  |
  ;; initialize the patch-owned variables and color the patches to a base-color4 w* q6 B, x$ A& p& D( a
  ask patches
3 G( o2 E% c% v  [
8 d! Y5 h6 B# h% p! }+ w* a4 o% m4 T1 ~    set intersection? false
8 K" L1 v) ]  N" M6 ^    set auto? false
5 l9 I4 W! `# f) G    set green-light-up? true
6 q" K* Y( D( d1 N    set my-row -1
& B/ i* n4 K7 |" W5 w    set my-column -1
$ w/ V; b% H9 k( H9 \0 `# I  f7 f    set my-phase -1: Y# m6 K6 k- v( g7 t# N3 r% z5 H
    set pcolor brown + 37 Z8 A( O1 T( W% r
  ]: A% E  m0 x( S1 I' |9 u

: P, ~5 w; B: W) d8 f  ;; initialize the global variables that hold patch agentsets5 M3 G# m) Y1 ?$ D
  set roads patches with. a/ N& j0 z/ |  e* R
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
* p% @( f7 o" y: |/ {    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]: h# V! l, I/ X
  set intersections roads with3 g: g" k4 A! d, P1 v' e" G
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and$ h! o) p0 u* _- ~
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 C: F8 L/ L, a. m( T
5 a3 h% I- T$ W9 x; O! b' U% Z
  ask roads [ set pcolor white ]
. S" ?0 P( v% i$ h    setup-intersections
. @6 U6 l. Y0 o+ @- D" z; F6 [end
4 F: W& k: Q  Q- z+ M其中定义道路的句子,如下所示,是什么意思啊?
2 F. q- ]1 _  r$ Q. m6 W  m0 L set roads patches with2 R; H: S; O! i: J1 R- w* \
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or  |  G- j4 ?' |- I6 D  b' T1 I
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]  r( X7 j6 V5 r
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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