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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。
  B5 a6 j: O: Anetlogo自带的social science--traffic grid这一例子当中,# f% R8 O: F4 A. `: w* Q
globals
+ X" H+ v& I& M$ U( \[
- y7 g# U  Y" c% q  grid-x-inc               ;; the amount of patches in between two roads in the x direction
* m! g$ s8 c) D( h) @  grid-y-inc               ;; the amount of patches in between two roads in the y direction* `2 J( @' p# V0 g5 R0 R+ r
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
+ S# ?! |0 D, N! p' @                           ;; it is to accelerate or decelerate
, D$ f2 H- m4 l9 q5 D- J1 a  phase                    ;; keeps track of the phase
( ~8 Z% g0 _" M  N  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure& u+ ~* g/ B/ A: _$ f0 D
  current-light            ;; the currently selected light
: `0 Y- C. ?0 ?6 d# \3 H
$ q/ U4 @# W3 M- G$ u3 P& M  ;; patch agentsets
$ v3 q* X' g0 h9 ^  intersections ;; agentset containing the patches that are intersections
! l; C5 V+ X2 i3 ~$ q; f$ h  roads         ;; agentset containing the patches that are roads
7 V* m6 p' U8 B. }, I# C: q' a]6 d7 z1 W4 p/ F* F+ S7 K8 B

7 B0 ?- S4 }+ w' q4 p* s$ z4 }turtles-own  v- c3 X' U! U$ a0 U
[' \: K  X( G# O, }2 J- T" _8 T
  speed     ;; the speed of the turtle6 A1 y4 f  t: d+ L& J+ F
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
! D& v4 c# l+ O2 a  wait-time ;; the amount of time since the last time a turtle has moved" i6 i  K: A" D, M
]
* B8 S% I4 o: @3 R
; _1 r% s4 j* E1 V$ m( i: kpatches-own
  d: k3 d$ G: \4 n" g[
& _. q1 K, t  y& _. \  intersection?   ;; true if the patch is at the intersection of two roads7 |" ?' q1 f3 t6 k  G
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
* e2 b: k6 \' m% i! v0 Z% Y                  ;; false for a non-intersection patches.$ ]" t" I# I' ~0 h. B& t* ]- u
  my-row          ;; the row of the intersection counting from the upper left corner of the: Y6 ]( C1 U1 ?
                  ;; world.  -1 for non-intersection patches.5 ]$ X6 v0 }2 y, a/ N; d1 C
  my-column       ;; the column of the intersection counting from the upper left corner of the4 h& l# D) R# r0 P
                  ;; world.  -1 for non-intersection patches.
* S7 F$ D  V  q+ U/ P. N( O  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
  o% S! O3 Z8 z  ^  auto?           ;; whether or not this intersection will switch automatically.; \+ L; H9 ^; P$ ]6 K- i6 V# K
                  ;; false for non-intersection patches.8 v& q& j+ W0 o: q
]  E2 j2 P# Y: Y. V1 o3 s. ]$ n
# ^' v: ^; U7 r* u. M

4 e- \6 T; C: i1 W8 F+ u;;;;;;;;;;;;;;;;;;;;;;- K1 h% T( b1 W  `* }+ d
;; Setup Procedures ;;
+ p: H& c5 T, l6 ~  D+ b# r;;;;;;;;;;;;;;;;;;;;;;
6 w* X3 r2 B4 S; z' i& Z2 t: b: L7 o. c/ d; s! Z3 f* _' ?5 k: J. Y
;; Initialize the display by giving the global and patch variables initial values.
6 }- z9 I0 }; _7 b" Q;; Create num-cars of turtles if there are enough road patches for one turtle to( M7 `7 `) l; ]" L# A! ~
;; be created per road patch. Set up the plots.* Y' ~) q) F" n: F
to setup/ L" F7 Q: |  t6 ?( l  r6 h2 p7 X
  ca
- P& [- b4 Q! Z" x8 _( s' ?* H  setup-globals
; I+ {* E4 j5 P  T' f- p  [3 c' D# G- U3 E% y/ Y3 R' ^( ^9 h
  ;; First we ask the patches to draw themselves and set up a few variables1 d# L" P( q3 }# ?. r
  setup-patches
3 Y, y8 X( ?; h3 g  make-current one-of intersections
- `) P6 d8 w- q; w" L  label-current' e  s2 d! \7 f4 H0 R  g; n

3 Z( E6 S2 m3 e  set-default-shape turtles "car"
  Z$ U( x' [, `- ]* C  i4 q# i! G7 }* Y4 `/ U: u6 {
  if (num-cars > count roads)" G- F+ {& ?5 m) V1 g6 D' K
  [
& r' a& I6 ^' _$ k    user-message (word "There are too many cars for the amount of "
2 q, F+ _( A4 d, w) @6 T                       "road.  Either increase the amount of roads "& G1 |. M( L) ~/ \* a
                       "by increasing the GRID-SIZE-X or "
" y* C$ G! @/ A9 G3 ~                       "GRID-SIZE-Y sliders, or decrease the "
, `, q4 R$ J' ?. q' h2 r- _  C                       "number of cars by lowering the NUMBER slider.\n"
* h6 J% Y) _2 U0 P6 @3 h                       "The setup has stopped.")( J0 R. j2 J$ S
    stop1 m6 m, `! s, R3 m
  ]
" L$ ?/ U$ O5 t) s' n" q9 B; b& Z; P& z, x' m) _0 H7 u) Q5 u, {
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
& |) B5 y, q/ }  R. a3 A  crt num-cars
/ u+ }& ~8 ]7 F( J2 X# [/ @) C/ j  [
8 D0 X7 v6 @, K    setup-cars
( {1 o0 y3 \) X  I    set-car-color$ O. n$ P& v* M: e
    record-data% N7 v8 q/ A5 ]# V! W* w9 M
  ]+ T8 B5 m: _5 |) E/ _9 w" T/ v
, h4 y3 E' {  K/ K  ~, s6 ]+ R
  ;; give the turtles an initial speed
& k' k7 V( r( h% x7 H- b  ask turtles [ set-car-speed ]
5 T# l) F2 O4 }$ h/ |) A5 _8 U% i% h: l% ^5 u
  reset-ticks$ L: p- v% K3 U! _$ D) p
end( X! U, U: l% L( {

" _& U* i# N! U" s;; Initialize the global variables to appropriate values, r/ U& k1 A: w
to setup-globals
. O" ~& \( H# M" z( [$ z/ w  set current-light nobody ;; just for now, since there are no lights yet5 D1 o4 v4 G% {7 u
  set phase 0
% F+ c3 u6 q/ h0 ~  set num-cars-stopped 02 I5 _# m) m" u
  set grid-x-inc world-width / grid-size-x
& e% V7 r+ @' _% O. z  set grid-y-inc world-height / grid-size-y
  E+ Q5 }3 w3 s9 `" X6 c
3 G9 L! a% x8 W+ _$ [. ~  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
7 F( y  k. {$ Q8 M, Z3 a0 ~  set acceleration 0.099; x, ^* K! Q; G! u
end& W9 `1 C2 M  o  l" I. I* H

: {2 a% v: g; l6 P;; Make the patches have appropriate colors, set up the roads and intersections agentsets,: c. |2 @2 I0 F5 {6 M& i& W$ S+ N
;; and initialize the traffic lights to one setting9 V) W2 ]* n) p) M) x
to setup-patches
2 L+ H1 Q3 \+ |! `  ;; initialize the patch-owned variables and color the patches to a base-color
) W  a9 Y1 m& J: u6 \+ d; Q7 Q  ask patches! X$ d4 `) Z9 D' k
  [
, V$ S$ F/ c6 `! F* ^- a6 \+ V! `    set intersection? false7 G, [7 ]0 g( g% f2 p
    set auto? false, r1 f( P3 N9 r; o/ H5 A$ b/ c0 U
    set green-light-up? true& y) q  c2 x6 s' Y4 t* ~0 }% E$ _
    set my-row -1% j: [: C8 H% T' h' x
    set my-column -13 r. T) m+ Y' M
    set my-phase -1) @/ m! a; Q% A( w2 ]5 \
    set pcolor brown + 3+ @/ V( f" N& Y" A
  ]0 c9 M' j2 p: k6 \, v! y
8 I9 \; M  z; Y. F
  ;; initialize the global variables that hold patch agentsets& w3 h! C- `9 q5 j% x  ?
  set roads patches with3 u& H4 y% }0 |' s, K
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or7 I+ T% J% q. A1 |( [
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
% I9 V- _! u4 i: l- _, [/ O  set intersections roads with
8 q+ j, H7 |$ T$ x+ j    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
! T! g  v3 k1 p* a+ w    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 s2 M( Q: o' X3 e1 N; L, u
8 I% B- |7 ~4 c# ?% w* r  _5 c6 f+ t
  ask roads [ set pcolor white ]
( V& T' x# j% l) O9 s    setup-intersections# I* K  I8 m& f" V' a
end
! z0 X0 _+ g/ C9 J# C0 P2 E其中定义道路的句子,如下所示,是什么意思啊?' U$ M1 W) @* I1 c3 j" T3 \
set roads patches with0 t$ P# L5 C. x2 V' ?
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
' ^' _6 R- s3 w3 h# v6 L2 S6 U$ x' w- ?    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]5 H4 d5 s' q8 t
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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