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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。$ L3 l5 o/ C" g+ G* X& A
netlogo自带的social science--traffic grid这一例子当中,! y) I& X. @. f: I. j
globals
) G! R- Y) c/ k* f2 @, d, I[8 U/ B# W" c/ @% A* o7 M0 R
  grid-x-inc               ;; the amount of patches in between two roads in the x direction) m8 O1 U4 o9 ^
  grid-y-inc               ;; the amount of patches in between two roads in the y direction# w+ L  b  ^5 ~1 [4 l8 \
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
7 y: c- S- ^  ^+ I4 C8 d7 t' ^                           ;; it is to accelerate or decelerate$ B/ |. @4 U! v8 h( @0 W. F
  phase                    ;; keeps track of the phase- h& D# |% x+ k; q
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
/ j6 m# b! i: Z2 F8 _9 m) t6 ~  current-light            ;; the currently selected light7 q8 W  W; @; N
$ ^2 p& ^1 U4 O/ ^4 n) B8 m
  ;; patch agentsets8 l# S  _0 N( q9 u: A
  intersections ;; agentset containing the patches that are intersections2 I6 B+ t0 q! ~# ~% F6 P+ u( y
  roads         ;; agentset containing the patches that are roads: }, I$ e$ e5 w3 c
]3 k+ {6 k7 e# k# ~3 e7 Z5 A# {
. C4 }& n+ N7 o; r1 q( m' i
turtles-own. I0 _3 z* N8 `! l4 L) |  G/ [
[3 y: `& r9 e2 v  D5 N
  speed     ;; the speed of the turtle
3 ~" k+ Z: x% G/ q% Q( H- B$ J  up-car?   ;; true if the turtle moves downwards and false if it moves to the right1 W5 A- z. I2 M0 ?" S* P) P
  wait-time ;; the amount of time since the last time a turtle has moved; n' f0 c- Y* F# w$ p$ \
]1 l+ O: `$ P" ^  P1 m" ?/ Y4 I0 i
9 E9 O0 }4 G: j# l- ^
patches-own
4 f. m1 d3 ?( d[
; G: @. A- h+ y( q  intersection?   ;; true if the patch is at the intersection of two roads- ?7 b8 B" Z8 J- z+ w7 h% ~8 R
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
5 o$ p$ e6 `; l9 R- t7 X                  ;; false for a non-intersection patches.
7 L! {+ n( z" B% o' o  my-row          ;; the row of the intersection counting from the upper left corner of the5 s" g* ?( c5 i
                  ;; world.  -1 for non-intersection patches.
2 J8 ?$ \/ d" D: K+ Y1 M; |  my-column       ;; the column of the intersection counting from the upper left corner of the
1 g1 U$ O5 Q0 ~( [$ r                  ;; world.  -1 for non-intersection patches.
4 q5 z1 b- q% _' q) X$ O  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
% _# Z* G- |% D- K  auto?           ;; whether or not this intersection will switch automatically.
6 O' e% p3 ~( [" d+ s4 ]2 p9 h2 ?                  ;; false for non-intersection patches.+ T! H+ y5 K* D7 d5 w
]
# [( R3 ]  T" ?0 M; D* D: Q4 [- p7 Y7 z3 u" m, `! ^6 A; L( Y
2 x* g+ Z% e4 _1 f2 N$ N) |! {
;;;;;;;;;;;;;;;;;;;;;;1 }0 _# ~. S  o. p* U' i
;; Setup Procedures ;;
& q3 c- L+ T& Z3 l) s;;;;;;;;;;;;;;;;;;;;;;) Q1 [5 D, p! L/ m
1 ]6 J: C4 g1 _: h7 h( }: ?
;; Initialize the display by giving the global and patch variables initial values.
! l. o. M/ k2 y5 x5 D; m. ^4 |;; Create num-cars of turtles if there are enough road patches for one turtle to1 r& }0 b( A0 W  w7 L5 N+ y5 j
;; be created per road patch. Set up the plots.
- [7 T. x8 B( g4 K- L8 b1 a9 [  rto setup
9 U1 U8 [. X$ l6 C) @  ca
; D$ q4 B# F0 s' {0 B  setup-globals8 o1 _8 N" G: [! s) f6 t- F
  M/ w0 ^, `% x3 c9 s
  ;; First we ask the patches to draw themselves and set up a few variables
5 v4 M/ Y$ C+ [+ ?0 p, B7 F4 c% L" E$ e  setup-patches+ e. j5 [1 n$ Z# X- o6 Q& @
  make-current one-of intersections: b4 r# E; t& y- Z& M5 x6 d
  label-current6 @' j' i& Q* [% U+ G

" z) K+ h6 X1 B& }. J  set-default-shape turtles "car"3 U- [8 {/ U; X9 l8 ]( c2 V: }. _

9 J$ h" x# p. d" T5 s( \  if (num-cars > count roads)- ^  S. r/ e9 E" d8 X
  [( U, W  K4 s# R% ]0 t; v  Q
    user-message (word "There are too many cars for the amount of "
' L& s& y2 G5 b6 t                       "road.  Either increase the amount of roads "1 b3 X) a: l9 A7 Z* K# j
                       "by increasing the GRID-SIZE-X or ": M3 B! r! q( I+ ~; X& }
                       "GRID-SIZE-Y sliders, or decrease the "
) o7 t2 W" J+ }4 Z8 E: Q                       "number of cars by lowering the NUMBER slider.\n"+ N& s8 Z1 O7 {4 U6 A
                       "The setup has stopped.")% P4 o5 [! O& q2 o: A
    stop# C) U2 r3 C3 s. N/ u- t( Z0 f
  ]) h( S! c/ U1 K8 e

7 c$ {* d( f/ i& ^5 R  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
' R( \1 q% k6 U" I1 g  crt num-cars: k8 P9 b7 y1 r8 d! A6 T
  [
$ }4 K- z3 B6 H3 Y, w7 {- f: `    setup-cars
7 V& t! l' B% ^, Z  W    set-car-color
' ~1 m0 {0 A  i' T. U    record-data
1 @3 Q- l' x* f+ L3 T8 z/ b  ]" {4 f4 H& W' \- |' |; t+ b
$ B( L& c! g, j1 ]3 i. b# c
  ;; give the turtles an initial speed
$ e+ E  C: y: v  ask turtles [ set-car-speed ]; @5 X! t3 b& z0 n. K* z# G- H

* E4 F8 K+ C* A2 m1 i  reset-ticks
5 a7 a# c8 d- |' T; k7 `8 ^end
. w9 R7 i$ X( b; ^' h1 g7 \) B  S: z/ m9 P  w9 r. j
;; Initialize the global variables to appropriate values, F. p% ]) z2 Q  k5 I* M
to setup-globals
$ n  \* Z0 `: D8 M$ @  set current-light nobody ;; just for now, since there are no lights yet# R3 T8 e' S! q6 C! N/ B
  set phase 0( n% R: a7 Y8 Z
  set num-cars-stopped 0  B9 n" B  ?) b9 E. r6 \
  set grid-x-inc world-width / grid-size-x
2 o$ P) l2 x5 }' D  \6 v  set grid-y-inc world-height / grid-size-y& \4 a+ j- Z. ?. B. ^  G" k9 D

" |. y( x8 I1 K. M0 `* u% U2 Y; z  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
$ i1 v; @7 [  h  T1 C1 F  set acceleration 0.099
1 g' J/ [" v5 R5 j: h6 z+ bend
, z! F1 p. p5 O0 L7 i$ E
, `% O$ B- f  `% @3 h) l/ o;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
/ ~: J; D, Y7 ^2 b4 Y;; and initialize the traffic lights to one setting) H3 J5 I' A# d; a" {  W, ]9 n
to setup-patches, y: C" k- y$ S) u
  ;; initialize the patch-owned variables and color the patches to a base-color+ z0 _$ i+ W3 ^9 a0 h
  ask patches
& n% t3 v; P3 Q: a, h  [
4 u9 }/ `; w! A- t' t2 S7 q( P    set intersection? false
, O, R" i$ s# E    set auto? false, Y( }! J1 M' n6 g9 L! q/ _) A
    set green-light-up? true: c8 X6 N4 {" ^" t$ e
    set my-row -1
: l: j1 y/ p! M* v    set my-column -1! M9 f3 V% N  P% t3 O& i
    set my-phase -1
: O5 P% q" N' [    set pcolor brown + 3
4 Y: v. {0 S! U( P  ]
' B8 ~$ F! [- Q* v: i. j& w, m1 l
. Y  A+ t1 _! s$ \# Z6 ?0 V9 x, G  ;; initialize the global variables that hold patch agentsets, x" e# E0 I% B
  set roads patches with
! A5 h8 E5 Q4 L0 I5 l( X    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
& g# C' Y2 _: [- n3 t    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]. L5 W: _8 M2 p0 j6 n8 r& k8 r* N
  set intersections roads with
4 y5 ~3 J- j8 O    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and, j2 D4 W, b% ]% j5 h; L. h1 @8 W" N
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
8 F8 p6 n6 J) p6 \8 }
8 m; Z; y$ U' d! a8 o  ask roads [ set pcolor white ]$ S/ m+ `3 G8 E6 }) e8 e, W1 o
    setup-intersections  s: l6 g9 R$ q2 k
end; g% U9 |$ }( p3 F5 W# K
其中定义道路的句子,如下所示,是什么意思啊?
0 |3 k$ Q8 s; ^ set roads patches with6 z: V$ _# e! G: z% n
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or' p( e& v  ]( X8 T! a
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]; d$ P# H' R: i, C8 z. s5 `
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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