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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。1 u1 p4 C* h, |. }# n( q! e
netlogo自带的social science--traffic grid这一例子当中,
! G. B9 `% q: I2 T  ?globals( B5 @1 r! D9 O: K/ J
[5 m0 t! I$ o$ w/ `: w
  grid-x-inc               ;; the amount of patches in between two roads in the x direction; u& J* L# w5 e9 t- U5 ^2 o
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
/ I( k% t2 i" F% K5 o4 Q0 e  acceleration             ;; the constant that controls how much a car speeds up or slows down by if$ n, f: M; g0 h) e
                           ;; it is to accelerate or decelerate
0 z: F5 k5 x1 Q& D7 X+ n& L5 F% [  phase                    ;; keeps track of the phase
+ D( s3 V0 e$ B9 u/ s* A  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
" e9 t3 h* ?: |) M  U0 v6 ~2 s" Q  current-light            ;; the currently selected light0 V. v: O# R1 q( q/ d( b
# b" {. v* T7 [+ Z1 v( K
  ;; patch agentsets* j1 ^4 L; M- H) x+ R- e, A
  intersections ;; agentset containing the patches that are intersections9 B; `2 {- m8 X
  roads         ;; agentset containing the patches that are roads% C* c  S( [+ ~* j% y( @2 r
]1 q3 ~# Y3 i+ y: q- l% s! z2 {

! {- \  ^( D' Mturtles-own
* s5 [7 d/ F/ r3 r[  X4 z6 b, g5 f1 D2 I( m
  speed     ;; the speed of the turtle
3 Q$ U1 f8 T8 h8 @  up-car?   ;; true if the turtle moves downwards and false if it moves to the right6 C. L' b9 U) B( c7 T" J
  wait-time ;; the amount of time since the last time a turtle has moved
8 g+ }* s+ |0 W* I( ^]
+ W" Q, g$ T' @# B6 F; y, c6 {: y
7 C6 O# q; z' t1 @5 R4 N# y) upatches-own
- Q/ K2 q' h5 n3 w- L+ l& s, b[
* _4 d( r# f6 K  intersection?   ;; true if the patch is at the intersection of two roads
% l; v6 O, }1 }# `, \  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.6 \. C- y- E0 G/ A' D. ^9 Q4 c
                  ;; false for a non-intersection patches.
$ z$ V& P. [4 L0 m' x# j0 `  my-row          ;; the row of the intersection counting from the upper left corner of the  d+ a) }7 c9 Y
                  ;; world.  -1 for non-intersection patches.
  V4 D; s3 K: h) E! h  my-column       ;; the column of the intersection counting from the upper left corner of the
8 \; p  n2 I9 l% q! e, l, U6 w0 Q                  ;; world.  -1 for non-intersection patches.
7 @1 ]( {8 c/ D( E2 F  K+ J: U  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
2 T8 z3 c# p$ h( q  auto?           ;; whether or not this intersection will switch automatically.
: @/ j* s# q+ c! v                  ;; false for non-intersection patches.1 c( v# \$ f4 y2 ]. D- X0 |
]
) S. c  d+ Y5 z4 G. N
* @- z" l/ ]4 z
* {  k9 k9 F9 g# d# h- O. |;;;;;;;;;;;;;;;;;;;;;;
$ S# J5 _& ?& `) V3 h;; Setup Procedures ;;+ e9 a' O5 a" w% g
;;;;;;;;;;;;;;;;;;;;;;9 E/ x1 l* s  ~+ A$ l
) h6 s1 }* u; I. N+ X/ t) U. K" j( r  T; ?
;; Initialize the display by giving the global and patch variables initial values.7 G/ E8 K5 }/ s7 L# }4 w) L
;; Create num-cars of turtles if there are enough road patches for one turtle to
% o* S. I; w" }4 u+ ~$ ]4 H;; be created per road patch. Set up the plots., R- B7 @% P& f0 q6 n" H
to setup* Z5 \4 v/ a4 l" E' N
  ca# J! N4 E' M& q4 t5 c1 v
  setup-globals  d" x. F' U! q! F1 a- n5 P) u8 [

2 L- k" H. d5 [  ;; First we ask the patches to draw themselves and set up a few variables
% i- p6 C) v1 G  r% y5 K8 X* j6 f  setup-patches  m$ o; y3 a$ o( G1 V
  make-current one-of intersections
5 p) o  f  ~) ~  label-current
% e- Y  b& [, @7 k9 m3 D
4 L8 q2 h9 `& |" l+ p3 s5 i' o  set-default-shape turtles "car"0 c! h" {/ _6 d

7 N: v: E* n& T! j/ n; q- \' _5 {  if (num-cars > count roads)  h7 ~$ a* {2 G! `0 a
  [
" N6 N/ d5 I' @+ O4 V' H/ [! y' Z0 V    user-message (word "There are too many cars for the amount of "
3 X1 h# A( h: C1 G                       "road.  Either increase the amount of roads "
. S- I% o  o! p, ~! E0 V/ u( ~                       "by increasing the GRID-SIZE-X or "4 u' G! O+ X3 \; s# z0 H! o  o. u) o
                       "GRID-SIZE-Y sliders, or decrease the "
" t( ?2 s! F$ T! d& z7 q0 Y4 R                       "number of cars by lowering the NUMBER slider.\n"4 ^9 p" b% T6 A% @+ T# u- M3 `
                       "The setup has stopped.")
/ ~5 s( t. \# \. i% n" s; c2 v( x    stop
! ?" a, L0 Z# U1 e7 z/ d  ]
( ~  W8 B' {# V4 J2 @
6 |9 q6 T+ ~& u6 O+ K. a# ~+ ~  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color2 @" q9 Q4 Z6 O( c2 j! l: b
  crt num-cars: y  @$ B" t3 h. S4 P
  [0 O# n/ ]5 Z- f. }2 E3 j1 ^
    setup-cars
/ u7 N7 G" ~! d- P/ t    set-car-color
; g! h% i4 F+ X9 h    record-data/ c% t$ v/ v2 L) f8 o* e8 Z6 y
  ]% R- C1 i. v# f/ Z( K

) i4 `7 N1 N( s  ;; give the turtles an initial speed# D2 ^; r% j& z& b. n: {2 R, Z
  ask turtles [ set-car-speed ]
" ^/ z' t7 J& x3 P7 h
( M( g! x( E" d/ o  reset-ticks
( ^* z" x8 m6 ~- G& D+ gend/ {8 I* H( h4 J) O& i* ~

( `1 e% p; k6 j1 W$ |! W;; Initialize the global variables to appropriate values, C$ V# n- M& X5 y/ v+ L
to setup-globals
8 a7 d, m5 j  N  set current-light nobody ;; just for now, since there are no lights yet
! `9 H1 v3 j- @. \% P  set phase 0
/ g4 ]$ b6 q7 l. V. }  set num-cars-stopped 0
' Y5 c" }+ |- q" e6 L4 @  set grid-x-inc world-width / grid-size-x: F! T) s5 T# ~  g5 |1 ]- c
  set grid-y-inc world-height / grid-size-y
7 }) D4 u; B, X1 C% g' d! b- W& l8 h' E& N* j& G! L# Y
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
' y1 k. }* e3 ~9 p4 d  set acceleration 0.099
! o$ ?: w% v2 V4 D  G" Send
) b. s: N9 a3 a/ o7 [5 v+ P" G1 s6 \! b, S; V( v' g
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,) o5 a; e8 l3 \4 [, w
;; and initialize the traffic lights to one setting
# h+ S2 E5 y) Z+ Q+ c  E  R4 k1 |to setup-patches  M) j+ f' U0 \$ L, b0 K. C( f
  ;; initialize the patch-owned variables and color the patches to a base-color3 g# m6 }- D- d" |9 o$ N
  ask patches3 D, m! s- b2 Y6 J) d" _, d; `( u/ l
  [
1 u7 J/ J7 ^9 {2 u: _    set intersection? false& L2 d3 |' K' i8 I
    set auto? false# @4 p0 m( ^, d9 Y* @
    set green-light-up? true8 a/ h  g6 z; w. U
    set my-row -1- P! g& j) E. W7 r: e
    set my-column -1+ W! R$ ?# ?1 @
    set my-phase -13 e  _4 O! w" ]" J5 h  N- y
    set pcolor brown + 32 S/ B# d) e/ C0 u5 Q! R
  ]
/ s% p8 R: y2 Z( Q' K: W
+ q3 y9 {; Z2 V# R, P2 S2 i  ;; initialize the global variables that hold patch agentsets' Y- k- [  v( \& B* n' u
  set roads patches with6 p8 e) W8 {3 p- s2 C6 j
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or+ j/ x0 d( |; m, V3 C, H: G
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]; }  B( I0 Y, |8 {" }
  set intersections roads with
+ g* i: x% i& F# S6 N, y, m/ i    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
3 E' w7 D4 Z  @3 g4 }% v    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]! \# L4 ?' Y) ]7 r- }" g

7 a# V2 e1 N9 |' [; n. p  ask roads [ set pcolor white ]
+ Y8 }' ?' c5 O    setup-intersections
" B' d4 e1 R9 F( W/ w) q2 send. |, k  D1 Y, C2 m) e8 u
其中定义道路的句子,如下所示,是什么意思啊?; S& l4 D+ X: B# m! J8 A, H
set roads patches with
' O+ P' X: F- S7 f    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or. g+ L6 I$ ~% |4 u
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 p6 J; U+ j5 I! W
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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