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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。
7 C- a0 n9 l6 onetlogo自带的social science--traffic grid这一例子当中,
' [- j- f. A0 ^( s" Wglobals' c* d% {% ^7 C  c  J/ |
[& ?3 y. ~! r- k/ d7 r  m# u/ d; s
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
# O: Q2 g; r% H, v# A0 X- t  grid-y-inc               ;; the amount of patches in between two roads in the y direction) h" [( @, u4 X+ @
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
; C" ?: x! B; ~# p* A; |                           ;; it is to accelerate or decelerate5 D7 G5 p6 c1 `* r1 @
  phase                    ;; keeps track of the phase: t% R5 a, ?. J
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
0 d% O& j" R# B% c  current-light            ;; the currently selected light
7 |# B8 L' h6 T* N
2 M9 Y1 I9 K2 y3 T  ;; patch agentsets0 f) Q; ?# T5 E6 A  \7 \* K+ f+ y
  intersections ;; agentset containing the patches that are intersections
% H' p* C7 X/ R* g+ B( R( J  roads         ;; agentset containing the patches that are roads
  L3 h( P% y: O# m0 I3 d]
" `, A3 u, j0 l. i3 t, p5 p3 ]2 n* E# i) B  R1 D, X
turtles-own# T4 ^% P  E% z0 J
[# |" h1 u5 H6 Q6 ^  \: ^
  speed     ;; the speed of the turtle
8 b8 q! b. Y' w/ v' n% y- s+ x  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
/ i/ s% R$ g! C6 |& s0 }  wait-time ;; the amount of time since the last time a turtle has moved
( L( [# a/ e% H6 I& C]' ?6 Y" `1 y4 v& p3 P6 a$ S
; o0 [) ?7 `8 W" `9 j! Q, v
patches-own0 f, h/ c% ~, ?# X3 J
[
. C  r5 l& L6 s  intersection?   ;; true if the patch is at the intersection of two roads, f4 k! w% r5 d# i7 W, h& K! m
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
3 j8 Z0 Q. R8 p                  ;; false for a non-intersection patches.$ l% W  {) s9 I- o
  my-row          ;; the row of the intersection counting from the upper left corner of the
) z+ t  l2 `; q9 w                  ;; world.  -1 for non-intersection patches.' c# `/ D( W* i7 Z' k2 e( n
  my-column       ;; the column of the intersection counting from the upper left corner of the
# M" _$ n9 x. {* d4 C; o                  ;; world.  -1 for non-intersection patches.$ e( |5 q$ J; }- b+ G/ M' ^
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.# x2 A/ ~8 d9 y4 l. d8 F/ O  t
  auto?           ;; whether or not this intersection will switch automatically.
. p3 G+ h4 i' L% B: E; J' Q" W. i  v                  ;; false for non-intersection patches.
% ^& t5 `6 Y4 |. _" G8 U]
: {' }8 G9 H/ i3 \2 r
  y* A4 r% R# L2 z4 E
- @' ^( i- h/ ];;;;;;;;;;;;;;;;;;;;;;1 H4 f' @, H) J
;; Setup Procedures ;;; P5 B# y6 a: S2 q/ l
;;;;;;;;;;;;;;;;;;;;;;! o4 n8 B; _* j9 X+ f; m

4 y# w- m  w4 k3 Y5 q# h- @;; Initialize the display by giving the global and patch variables initial values.
) A5 V5 U# S/ x/ I5 L' ]1 q;; Create num-cars of turtles if there are enough road patches for one turtle to
/ y+ t$ Z: `1 H: t3 q4 N7 e+ {;; be created per road patch. Set up the plots.9 A/ z( E3 [5 s" s/ s6 _! l7 B
to setup3 _9 T+ y  _% R, G% h
  ca
: d" i% e3 T2 P* e+ y" p  setup-globals
9 h" b; ^: `3 B6 z4 S
0 h& i' l4 F' H- d# r7 m  ;; First we ask the patches to draw themselves and set up a few variables
/ k# C% F+ J+ n1 h4 S8 p  setup-patches
) V+ [: H1 V  x: s* p! [5 z6 g$ E  make-current one-of intersections
& L& e2 |( _& b# d; f3 ]! L  label-current
8 S% B. C$ u( k0 [& T$ {( I" O9 k; k0 R; O
  set-default-shape turtles "car"
0 J4 f/ r  G+ x9 I7 w5 S# r4 W$ j# t0 x, N6 @( {: Q) v0 |! \' L  f9 a
  if (num-cars > count roads)$ c( ?- _5 X0 L3 j
  [
! a6 a1 v! H* j1 D0 K- F    user-message (word "There are too many cars for the amount of "
. ?+ t+ Q- o, C% r                       "road.  Either increase the amount of roads "
2 T8 O- z9 w/ b+ f0 T  ?                       "by increasing the GRID-SIZE-X or "* a  K4 X5 P1 F# l$ F, Z
                       "GRID-SIZE-Y sliders, or decrease the "
  Q" u- m% `! J                       "number of cars by lowering the NUMBER slider.\n"
- y0 q2 a9 m( s) h8 q& m% `6 Z                       "The setup has stopped.")
, n# [" h* _& V$ {3 C6 A9 l, G    stop8 i8 g8 s' ]6 S5 a
  ]# H* o) s! }$ H  \

, A- R* R4 n2 N$ h; |; F$ s  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color/ L& O/ f3 R; }# B9 L5 X( [
  crt num-cars
% X5 R" \  w0 M+ x0 w  [- S' W2 o% s; S! G( |, L; d3 a
    setup-cars
5 T* W+ C6 y4 K4 T& i    set-car-color& Y8 B7 R% a2 ^. j0 e
    record-data1 l3 _' Z! k& p
  ]7 e$ g0 B4 W% \& T
+ ^2 C5 }: Y% C4 C2 I+ B3 `
  ;; give the turtles an initial speed
/ R0 R, R/ N* l' p2 ~  ask turtles [ set-car-speed ]; B; k7 ?/ m  p. ?
) h- R4 I6 r  d9 u) ~+ N" z; Z0 d
  reset-ticks
2 U8 V, ]9 |: s) ?6 I: A5 @4 Kend! t2 `2 g8 w' E7 V( F& `

2 e- Z' z7 c" c4 f  Z;; Initialize the global variables to appropriate values" Q5 {6 k  X1 W: |0 j. Y
to setup-globals( ^& q8 i7 J% k( L( x- z8 [) M
  set current-light nobody ;; just for now, since there are no lights yet
6 n7 f2 {1 j! e" u8 ]1 O  s  set phase 0
% N0 a* P9 I0 I* Y; l4 f  set num-cars-stopped 0- X9 d. a+ n4 f/ |$ t
  set grid-x-inc world-width / grid-size-x
' Z) I6 ]! U! q8 I1 [/ O  set grid-y-inc world-height / grid-size-y( T% l2 v0 I) p( v% Z
/ n. s  v9 E9 M9 I  A, ], j
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
9 t: k1 t6 l- D! T1 @& u8 [; x' @, F+ @  set acceleration 0.099
' g, Y7 e+ G. _end
$ e% a. [; ?3 T3 J+ [: c# N" c/ i* ~: i
0 l; K5 d9 r2 }! _" r;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
8 n' j( W' B# g) h) d+ S, Q;; and initialize the traffic lights to one setting
# v- e) \( J+ {to setup-patches/ B) c3 {2 P9 B" \) a, R5 H( `# x9 R) R- {! `
  ;; initialize the patch-owned variables and color the patches to a base-color
# M/ ^% [9 Z- x: m' A  ask patches
9 J2 A' Y% D; _! b$ t# _6 E" |  [; M8 Y( C! q- I0 f# N/ o4 A
    set intersection? false
( R2 m9 x/ \: t/ Z$ V    set auto? false$ k, k2 e! ~: j9 v6 }
    set green-light-up? true, ]8 d& F& v4 r8 ^' M. m/ K
    set my-row -1
; l- g, c' K: c3 n* y9 N/ m6 C( K: V    set my-column -1
/ k# |* u# r, Z+ H7 e$ K    set my-phase -1' w* f& d, `* }; q1 l' h8 y; H+ J
    set pcolor brown + 3
$ \* n" l" \# T" g( T  ]/ U; ]' ~+ \: y% E% n4 k" o' P( T  T  {
  p1 p. g  L! M& t2 o
  ;; initialize the global variables that hold patch agentsets
% C0 h* G; T$ x1 g" U; K' J( f5 B$ W  set roads patches with
: n& Y8 [& w  x! R    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or; _+ `, ~  v& _9 y4 D* E
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
0 z# R$ J3 n& n. f5 b9 w: q  set intersections roads with
4 a% ]6 `) I0 E6 U+ M5 U    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and9 B9 L- S9 y' g8 j; K; V0 f; y1 T
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
" w8 [9 O$ Y; G  c+ f; L. Y' g: w5 \  y' c) F- M! Y; W( t, Z: _7 C. B
  ask roads [ set pcolor white ]. E1 @- j0 _3 D3 [
    setup-intersections8 w( a8 ]* y4 a  n
end
9 W/ W& N/ ?& F# q0 _4 o. c其中定义道路的句子,如下所示,是什么意思啊?
) X4 e5 h  J7 t4 |3 e- r  A set roads patches with! e6 _' l( g# z6 D7 {
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or. A8 Y. M5 c8 d6 F
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
) s/ {( W+ k4 s: X1 E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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