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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 z6 x* d+ `# r3 y; `
netlogo自带的social science--traffic grid这一例子当中,
9 k! i! }4 ^6 Y/ f* t; e* _globals2 ^' U( B9 H7 X' p6 @. E* p, T6 I
[' i. T" R2 T' D: @  Y, \* P
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
3 l5 ^- F3 N* v3 M- g; r' v  grid-y-inc               ;; the amount of patches in between two roads in the y direction+ t% C8 j% n) ?6 ^3 V) f$ }$ Q
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if2 q9 {+ _1 X7 n1 S- f7 \: D; K. E
                           ;; it is to accelerate or decelerate
: Q* ^; ^& l& e( c* K  phase                    ;; keeps track of the phase1 X6 W8 l! x0 N- {0 K/ i5 e1 `3 C
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
' y/ y5 O( _: C+ u  current-light            ;; the currently selected light2 H7 P( t" H4 L" V* ^& d7 R

! W" h; E0 X' B% n  ;; patch agentsets
9 ^' `9 g9 U0 D& _$ B! _: }  intersections ;; agentset containing the patches that are intersections- L' u) o) n  \  Z( h' ?) N
  roads         ;; agentset containing the patches that are roads# d1 E6 V; V6 k& u" a0 B
]
* B0 @& ?3 {( ^& ~- j2 {2 ~9 ~' }2 n  P; R: m; S7 S
turtles-own
9 f: v+ C& _2 L1 T; @[3 B" n! P" `$ ]" \& x, A4 N
  speed     ;; the speed of the turtle
1 z! ?8 h- l  d: c  up-car?   ;; true if the turtle moves downwards and false if it moves to the right5 X1 g: \7 I3 Y8 S3 e2 Q! y
  wait-time ;; the amount of time since the last time a turtle has moved
! e9 {7 z5 O) E" |+ _+ _! I* h]
& `( {9 B+ W" E9 [; a0 ]/ h' m
8 t! D+ c7 W' u+ S1 e3 rpatches-own
7 m5 o) Y7 Y# B2 ~+ `[
. a2 U% N5 V- W3 Y! D  intersection?   ;; true if the patch is at the intersection of two roads2 q8 ^1 e; A( Q2 O# |6 F+ T! m
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.* z, Z& q# _+ B, [; {3 z  X
                  ;; false for a non-intersection patches.
5 ~  J5 G! L( u# H% k  I+ {" t  my-row          ;; the row of the intersection counting from the upper left corner of the% \* D2 u* q+ e! M$ J2 f0 F
                  ;; world.  -1 for non-intersection patches.
0 z4 [  {$ U* g& a; j& i" S  my-column       ;; the column of the intersection counting from the upper left corner of the
& O; Q/ {; C2 m, ^                  ;; world.  -1 for non-intersection patches.
+ {/ M8 \$ g/ p1 n  ^% y; @  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
. ]( u5 k" {  J/ f  auto?           ;; whether or not this intersection will switch automatically.
" Q; Y4 V2 l7 [5 t                  ;; false for non-intersection patches.8 s# N6 K; f5 _5 I! c- B
]+ h0 p; ]. J2 ^# l* g& G! g9 U

* |4 e# U2 n$ f7 ~9 n" j# |# Q& V% @8 D! n7 U* g& \0 q# T4 C0 B
;;;;;;;;;;;;;;;;;;;;;;7 r" }# J% \& ?, H( }
;; Setup Procedures ;;9 F$ a  T* ]6 t2 A0 S2 U/ v
;;;;;;;;;;;;;;;;;;;;;;
: I5 ^( {& N7 {- M& [$ L( z: w: ~8 s5 F! N0 E1 O7 D5 t: Z
;; Initialize the display by giving the global and patch variables initial values.
6 g" Y- e& a/ q3 b! X" B' C$ r. N;; Create num-cars of turtles if there are enough road patches for one turtle to' N8 Y" m* [, s1 N
;; be created per road patch. Set up the plots.
& f- d+ ?8 b% {' c5 Sto setup
8 {( _1 k* k& A/ D/ F8 a( a" V  ca
3 i+ v, |' u# N3 ?  setup-globals
$ F- Z$ t3 n! g2 V" M" P# M
7 b1 [, w5 N0 c+ {  ;; First we ask the patches to draw themselves and set up a few variables8 l& n; l3 [3 u+ R# H
  setup-patches1 X6 G3 k' Y% X: p* Q6 Z2 b
  make-current one-of intersections* E) V; Y0 J4 }- Q! u& \
  label-current, {$ V+ H- b3 W& d. |

7 }" P* A+ a3 Q. Z( c( n7 z6 M- ?: Q  set-default-shape turtles "car"
. |# I' \4 p. ]  L  s5 e; t7 p5 h+ {
  if (num-cars > count roads)
; i8 K2 k' i1 O, L! J3 Q6 D  [! J  Y5 e& O: k6 m0 J. g6 \$ I4 S
    user-message (word "There are too many cars for the amount of "
& z& N, R, t  t# Z, s' @5 c                       "road.  Either increase the amount of roads "' p2 s8 c% q3 s8 b
                       "by increasing the GRID-SIZE-X or "
9 n! Q- s& u; i8 X3 K3 g% d! b/ [                       "GRID-SIZE-Y sliders, or decrease the "
% d; d# k. H1 b: c* b8 F                       "number of cars by lowering the NUMBER slider.\n"
% o7 e7 z5 P2 `' Z4 x                       "The setup has stopped.")% |8 x  q8 i$ U! f5 f" W/ g# \
    stop
: Q; s/ G5 E  [" I/ |6 U- H. v1 Q  ]
+ t* e- [8 {4 K/ X9 e- h) ]0 h; o3 F7 l/ x
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color( P) S5 M" z+ {: q& S- |; w6 e* j
  crt num-cars+ l* I( k. ~; Y/ `# w: V
  [$ O; f6 |2 z. h
    setup-cars$ o% V8 q( ?/ Z. Z% x2 c0 x2 A  v
    set-car-color/ d. W# b% q: E
    record-data
* o) \+ q5 t  V; G4 `. P  ]
/ R; N1 Q$ k( c& ~& P9 o  S% h- k
5 M5 ]& C) C* }. T- X4 c  ;; give the turtles an initial speed
4 C* i$ F& H) f# [% {  ask turtles [ set-car-speed ]
4 r! r. {+ m# o) ]  R2 m: m6 p# S
* u' t5 |; u6 }, `" s0 N' E  reset-ticks
* A( J1 c; v- T1 G2 E. v; n1 bend
. ]! [3 I$ L4 ~! a4 G5 v
. z- D& Y2 M3 P* |; c* K' z;; Initialize the global variables to appropriate values- X1 ^+ x4 ]# N* G+ W
to setup-globals( Z4 C9 G3 w) T3 ]% J: q8 Q" z
  set current-light nobody ;; just for now, since there are no lights yet) S9 g  {5 G( |& Y  Q: |; t
  set phase 0
( z7 d% Q7 j& z! _% k& e3 n$ Z/ O% m  set num-cars-stopped 07 s: J+ l5 O  {( ?" W5 k/ R, j
  set grid-x-inc world-width / grid-size-x
( k6 J4 }+ v% U0 r' |  set grid-y-inc world-height / grid-size-y
6 q1 ~! y; ]" N, x& J4 l! V) l; K* n5 B
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary; W2 G' b( s# h" E
  set acceleration 0.0991 B, g1 \2 a; y1 i% ?% N
end
5 {9 C4 u. j% a1 g' W! y* g. N7 ~8 f& B  g5 ~2 a( t; a1 Q, m
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
+ T& g2 m# A2 a' v;; and initialize the traffic lights to one setting" h3 c1 P# d9 a) E
to setup-patches+ w% J$ Q% S, B6 V  p( S9 t% |
  ;; initialize the patch-owned variables and color the patches to a base-color% K, X1 y# m2 P3 N
  ask patches3 h- |% I4 L0 G
  [4 c' [- y1 A7 f1 A0 ~1 M: @. n& W
    set intersection? false# U: V5 A/ e$ v! r, v% C  O, ?
    set auto? false
5 x$ u0 h1 A$ y4 j0 H* Z    set green-light-up? true" o, j; |/ j7 Q
    set my-row -1/ O3 Y+ n/ H5 x8 Z0 O4 r) |
    set my-column -1! `; o& L% e0 X* U# @3 |4 q
    set my-phase -17 J& c9 ~: X$ t4 @& K( A
    set pcolor brown + 3! E( y4 D6 r% k! F' x3 K
  ]% ]' e: q! O: H  ~" U: N

1 X9 \" k0 z% {& b  ;; initialize the global variables that hold patch agentsets
; E. T6 `8 _& d$ D0 y  set roads patches with
# K; \7 M/ q5 Q    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
5 s8 I! y! d8 n    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
5 W; z- P* u5 i  set intersections roads with/ w- t" W* u; R: N0 b' u
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
3 |* s7 x' E/ w    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]: [9 B7 g  S2 n
/ J5 u, M' u; ?0 Z
  ask roads [ set pcolor white ]3 B$ w  a" N7 F, e
    setup-intersections
  @! o0 @7 X; send
0 W9 |4 g1 @8 `+ K( j其中定义道路的句子,如下所示,是什么意思啊?
7 }8 x- h9 h. r* o) K/ I set roads patches with2 U4 {& x$ L) X% v/ ^7 m
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
6 u# ~  [; b: j9 X    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
8 N# }% Y2 _. v2 y5 b) `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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