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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。
6 r. q8 o3 m; z4 c8 \4 W5 j, enetlogo自带的social science--traffic grid这一例子当中,4 h1 ?8 R) R' o# S
globals- ^0 i7 s5 ^: Z8 J0 Q/ ^- t5 T- Q
[
; U8 B2 a3 q2 f2 Y) i7 S  grid-x-inc               ;; the amount of patches in between two roads in the x direction. j; s; J( }9 I0 a  B
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
: u# ~& \/ x7 a9 a. A  acceleration             ;; the constant that controls how much a car speeds up or slows down by if9 C+ z* ~' U; t
                           ;; it is to accelerate or decelerate) J6 L, f9 P; A
  phase                    ;; keeps track of the phase3 m5 F% _, E; ^6 i! h. T) X' j& Y* k
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure- m1 _2 c: J% K; F, [! s3 g+ ?1 Q* A
  current-light            ;; the currently selected light
: k, b3 c5 L' {7 M2 O. H
: U2 ?# b7 {! b" Y. B+ X  ;; patch agentsets* n4 O0 z; D) v/ P' ?
  intersections ;; agentset containing the patches that are intersections1 z8 J! g9 S' T) \+ T" _
  roads         ;; agentset containing the patches that are roads
) q; ]; O5 {' B8 }- f) G]
: j1 _! K4 J) _' \. i% \
- [/ I* R7 r  ?* p1 cturtles-own
$ Q0 S( K' ^2 u* j7 B[
# y/ c" K1 K# q7 T. B  speed     ;; the speed of the turtle
  f1 F8 H9 g1 C& e+ L9 u  up-car?   ;; true if the turtle moves downwards and false if it moves to the right4 t- R! E$ P4 y; a
  wait-time ;; the amount of time since the last time a turtle has moved
; v- b8 [" m9 |' d]
# M! b) S! _# a: w
1 ?8 l0 g$ N6 X5 u0 m* Ypatches-own
4 F& _) W! C; H1 D  n3 J[1 N$ `/ Q; {# L) c
  intersection?   ;; true if the patch is at the intersection of two roads
- a. A7 S. S& R8 _( ?4 V; _  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
! `2 V) B7 U9 M6 o6 `& `                  ;; false for a non-intersection patches.* V. a7 F& O& A" U; g7 ~
  my-row          ;; the row of the intersection counting from the upper left corner of the% B2 ^+ W0 x+ m. @
                  ;; world.  -1 for non-intersection patches.! P" J+ }' T$ y( ?
  my-column       ;; the column of the intersection counting from the upper left corner of the; B4 J4 c8 `6 p1 Z- ~
                  ;; world.  -1 for non-intersection patches.
5 |1 |" t$ X7 V# o7 D  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
% O, n& W( R3 w0 O7 L1 C7 O  auto?           ;; whether or not this intersection will switch automatically.$ E' x$ t/ K3 Z( e, }
                  ;; false for non-intersection patches.$ A. t' r+ g8 ?  @5 ]
]: t3 n: ?7 \5 @2 v! g# b$ Y5 q$ g

1 y& N- f9 Q; K( Y$ n. f1 Q. Q- U% \$ W7 ^
;;;;;;;;;;;;;;;;;;;;;;
' v  f! f" f+ j1 Z;; Setup Procedures ;;  R3 D1 W4 j+ `9 k# o  X. v3 G5 \
;;;;;;;;;;;;;;;;;;;;;;
5 z5 p- Z& Z2 j" H$ W) _
) f+ u" n4 }9 e' Y3 r;; Initialize the display by giving the global and patch variables initial values.
+ \$ I: E* ^# F1 f;; Create num-cars of turtles if there are enough road patches for one turtle to
( k5 I' S6 j* U9 W; E;; be created per road patch. Set up the plots.( x& m7 n' z1 b' p/ {' \! c- f
to setup+ d2 c* c# Z" C2 Y, V8 \
  ca( R+ w1 E( n% p! H0 a
  setup-globals
( D  w" [9 B8 {8 N% y$ g
7 @' t( L# s1 ~4 y. F  ;; First we ask the patches to draw themselves and set up a few variables
4 M; |5 Z2 q/ C/ W" \, x' k  setup-patches( b2 o* ]6 y# P. [
  make-current one-of intersections9 N8 n6 m0 J; H5 ~* t& [' x. h8 u
  label-current0 Z. G# S# o. c7 J4 }
% f) v* B/ j( X% J+ f3 m
  set-default-shape turtles "car", F9 e6 K% B+ W( T! V0 }

$ [) N: R0 v& M( o. ~7 D2 b  if (num-cars > count roads)- H: ]; S  V3 ~! a, i
  [0 y0 T" p8 m+ I* v1 M1 o
    user-message (word "There are too many cars for the amount of ". d5 o& C0 i3 t' B
                       "road.  Either increase the amount of roads "
  y: W" e3 M% H" ?                       "by increasing the GRID-SIZE-X or ", L  P( i* g5 C) x
                       "GRID-SIZE-Y sliders, or decrease the "
$ `* I7 p% s( a2 Y$ _                       "number of cars by lowering the NUMBER slider.\n"/ f( L) Z2 o, G* Q" T, O% o  n
                       "The setup has stopped.")
# H! x3 C$ s4 [$ ?    stop( H0 M" u  I! P; V! Z
  ]
% T* W- p7 ~# A! z( N
; ^* q( V+ V1 d# B$ p! O4 F  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color1 c0 Q, {9 S" \/ V9 D3 G- _- y: B
  crt num-cars3 ^' I" \! ?" V4 V' Y
  [
5 Q9 Q: M) Q' x2 Q6 _    setup-cars9 R7 o- `4 h& `1 R/ e) o. i2 }
    set-car-color6 f0 K& \" |8 z! w; p
    record-data
+ V. c: U; H5 r7 _9 e) z  ]; ~$ \# r  ^. j4 b, E+ y
# @, r! f% o6 V' k: B
  ;; give the turtles an initial speed$ V4 E" R% {1 _/ N9 }! [6 _
  ask turtles [ set-car-speed ]! c" F* w3 i' |  r' }4 a
& H4 o5 v$ u$ |
  reset-ticks4 Z8 @7 g( i( n# l! \3 u% b
end; `! N( z8 d5 }; [- b: H1 d0 }# C
9 a5 G% o. d: P+ ]1 A
;; Initialize the global variables to appropriate values4 |- v/ N7 Q+ q9 e2 v# d
to setup-globals
( Q0 x8 h- O# v  set current-light nobody ;; just for now, since there are no lights yet
9 S* e) P* T6 F6 R: A  set phase 02 h7 s, V$ R" V9 j5 y% h# H4 F- d7 B
  set num-cars-stopped 0
" g9 c0 |- r/ i  set grid-x-inc world-width / grid-size-x3 P5 x9 @3 @0 \6 l8 Z' I/ b7 G
  set grid-y-inc world-height / grid-size-y
! W! [1 T+ T' [0 t% g; t
: X. j$ d: X& N  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary, Y6 M" E& f% t0 p/ c! _
  set acceleration 0.099
4 e6 n5 z( ]& Hend
0 y" o3 n1 \+ q" l) y
( I  E: j3 u" ~4 p;; Make the patches have appropriate colors, set up the roads and intersections agentsets,- W1 R, r' b& N& m9 c
;; and initialize the traffic lights to one setting- L- h: K. f, E% R' ?/ l1 M
to setup-patches* D+ Y6 T1 \$ d1 \
  ;; initialize the patch-owned variables and color the patches to a base-color# j6 L- j- y! `) ^3 ~6 k- n- g
  ask patches, _- Q- F& F- P8 ^: D4 |, Y
  [
5 b% R& _# l9 x  P3 [- F    set intersection? false/ \) S% ~7 _2 M, @  f  E
    set auto? false1 ?- c, ]9 T1 P! D
    set green-light-up? true6 z$ m: L! A+ T. W, e
    set my-row -1
( A0 D0 i: U' _% s6 R    set my-column -1
4 W% Z; [2 K: c  R5 q    set my-phase -1
! e& w* v2 i; s$ X$ t4 T    set pcolor brown + 3
- R$ A: ^( L/ U( d' T# D4 n  ]  B" `- G6 r' H$ |/ y* T; o! I
7 c9 j3 Z) U2 b# E9 m  j
  ;; initialize the global variables that hold patch agentsets
6 Z2 k' |+ K' _6 d; v  _, C% u5 r  set roads patches with( n! @  V, A8 c5 x% X# O( w
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or) Q  R/ \7 P( i/ @
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
1 Z; N! j4 D8 K. i1 {9 G  set intersections roads with
6 f; ~, m! e: a% j7 I, p    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
2 V6 b: t. P$ u$ W' P) G    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
! r# G8 w5 c) Q  Y) q. w( t, i+ y0 ?0 c- N8 S, s' t. u- Q
  ask roads [ set pcolor white ]
: k/ p7 ]* ~  N8 g, j0 z6 ~7 w    setup-intersections
) E- {; c' r  cend
6 j. ^- |- T; d/ i; u6 i6 r其中定义道路的句子,如下所示,是什么意思啊?
0 o: V' E0 _& [& v# B set roads patches with
9 _1 e  h6 c, i    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or" h8 A3 T  k( n* F. ?) z7 F& z. g/ [
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]' G5 {% m( W7 Z+ ]1 q2 p
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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