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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。
" U3 ^7 u% X5 k7 I0 a# S7 u3 Dnetlogo自带的social science--traffic grid这一例子当中,9 u& t! n+ @; L
globals) u6 g6 R. \% J5 |4 j3 w( c
[$ |2 R4 m/ Z" s: Z5 _5 ?
  grid-x-inc               ;; the amount of patches in between two roads in the x direction% X& f1 F8 Y* H% O9 f1 f: J; e
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
5 q+ I: @  H+ ?* I2 e& w  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
7 E% l+ L  u( L9 x3 t+ ?2 L                           ;; it is to accelerate or decelerate# W$ n( R, I6 z" e! P4 \
  phase                    ;; keeps track of the phase$ W  A, |/ \; a
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
0 c% o/ P  h: D: _  F  current-light            ;; the currently selected light: ?- e! D! D) @  O% l# H

7 Q; t3 ?, n# R! t( e  ;; patch agentsets
8 M( [5 U; D: I! |$ e" n3 v# b  intersections ;; agentset containing the patches that are intersections; m& l. v" O; Z# O/ }# J+ W
  roads         ;; agentset containing the patches that are roads% F+ r+ I0 ?. m5 u2 Y4 V1 [
]0 l" n6 M! U# I& r' {
7 I! T6 `: Y8 F" M2 E& {
turtles-own. D" }, D/ u; Q
[
: [4 ]2 e6 W- l  speed     ;; the speed of the turtle
! y% c/ E9 \3 O( z+ k  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
& w$ t( e1 V1 v/ w  wait-time ;; the amount of time since the last time a turtle has moved+ y7 n, ]* |- S( C; ]- f( H
]
9 C7 x) M3 j3 P) c; ~( Y2 K, E0 v* b8 ]% k' L
patches-own- p9 p* h" E. X( X# m1 X& m9 i' Z
[) J9 H7 w- c# x9 G* A3 R" H+ S
  intersection?   ;; true if the patch is at the intersection of two roads
+ B8 J7 Q- k- l$ U# K  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
" w8 s5 E, ^) l( ]2 U, D                  ;; false for a non-intersection patches.; r% `$ [0 a1 ^7 t: A
  my-row          ;; the row of the intersection counting from the upper left corner of the. I% S- h: ^" |4 u$ \1 T2 J3 i* J
                  ;; world.  -1 for non-intersection patches.
: u( g: J" l" m/ C  my-column       ;; the column of the intersection counting from the upper left corner of the$ u/ g# Q0 z) O/ `9 b' w; v- i
                  ;; world.  -1 for non-intersection patches.
* l! k& |; R2 [+ T0 a, @  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
6 K+ d( X' R6 M" K% [: V  auto?           ;; whether or not this intersection will switch automatically.
& B3 s! a& o9 u' S7 v                  ;; false for non-intersection patches.
' T6 B6 G+ N1 |. c9 H]
6 g) e3 \* g/ M1 c" Z! t
( `6 O7 B* H( g# G; f; n: r5 P" l+ d' Z3 _( \- z' E9 l+ K
;;;;;;;;;;;;;;;;;;;;;;0 E7 Q$ L4 f! `7 B2 l4 _
;; Setup Procedures ;;
0 U4 @7 [2 P/ b  l  v% H;;;;;;;;;;;;;;;;;;;;;;8 R" U; o* ?2 Y8 z, A5 f" V
2 D' B4 v9 [+ U2 z% p6 T1 }$ H
;; Initialize the display by giving the global and patch variables initial values.2 K! p0 E. s( q4 W# P! O
;; Create num-cars of turtles if there are enough road patches for one turtle to" g* g4 N! h- [3 T1 [% e% q
;; be created per road patch. Set up the plots.
' X  p1 b% s6 M. P; N, X' F! k: Uto setup
1 F! T2 S6 G. @3 ?* I$ m  ca
2 V) n' o1 G+ }1 d+ u' H  setup-globals, F" W9 o' p! b9 `
" J+ `% G0 X/ ?/ V
  ;; First we ask the patches to draw themselves and set up a few variables7 M* R, w$ Z9 ^" @( k5 v" _# J
  setup-patches+ K3 e! F( N2 Q( T( N
  make-current one-of intersections+ t1 d+ G) u* q) X+ ^# o
  label-current
4 Y. z* V2 J7 X4 S
, r$ ?0 r; G' {; F7 ?5 {  set-default-shape turtles "car"
6 N+ A4 F- i, ?9 g
; f4 j+ i- u6 N( U9 u  `: `0 I: ]  if (num-cars > count roads)
7 a7 `( Y3 b/ @2 }6 ~  [* i/ w  o) X0 c' D: T6 c/ C, R
    user-message (word "There are too many cars for the amount of "
$ B& H9 a! `! b  q7 F5 J. z3 a                       "road.  Either increase the amount of roads "0 Q7 }$ S; I$ N
                       "by increasing the GRID-SIZE-X or "5 W/ x2 z! {1 t) E
                       "GRID-SIZE-Y sliders, or decrease the "
2 t5 o8 N. ]# X) l. X                       "number of cars by lowering the NUMBER slider.\n"
6 p' E& _4 X) I! a- D' ~/ S                       "The setup has stopped.")' d7 n2 q: F# X7 Q5 c. j
    stop  H6 }; K; q% c+ k/ w- _
  ]7 e/ e# B6 l) @) B, @) `: p' [

7 X) p- T- Z1 e5 f, [& L& E- e; n  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
/ L4 }" h. N# h8 W" S+ @8 H3 B  crt num-cars
/ h' s4 a9 v) ~4 `6 _8 o0 v  i  [6 W, _$ a! G. p" S' j2 s
    setup-cars7 O& Y- a) j" k  A0 ]/ n/ |
    set-car-color
" E/ G: A/ V9 }6 @! `5 i" ]    record-data1 X; C" x3 g  ~3 t% V# F
  ]6 ?% W. ]* T/ l

% f0 k7 Z: o# s4 g  ;; give the turtles an initial speed( n# ^) ~3 d2 n/ F  p+ x
  ask turtles [ set-car-speed ]: ?, R6 R1 y% R: O# n! a

8 m$ B8 b1 j* X  k! S  reset-ticks' j% B& U! c7 K' l8 k
end
0 k7 t9 t2 P; k' t/ J
/ a1 X  U* v1 v, v' G& d;; Initialize the global variables to appropriate values
( y+ d7 o* ?: S' Z% dto setup-globals
! o, A8 K. I. J  _* `  set current-light nobody ;; just for now, since there are no lights yet# _9 K& q! M: Y
  set phase 0& z( a9 S2 ~5 F* ?' X2 d) N
  set num-cars-stopped 03 e$ N+ c: P' G$ K" R
  set grid-x-inc world-width / grid-size-x6 C2 Z. a# v* [8 L/ v- y2 W* S
  set grid-y-inc world-height / grid-size-y2 i3 a/ r7 {0 T. p3 f4 Q

+ ]6 v2 @/ d/ o3 r: w. P7 w- D3 a  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
6 ]3 k  q; ]. R" ?4 U+ n. h  set acceleration 0.099
# E6 H/ u# ?: tend* W% v) q# L( U8 L$ U

* n4 @  n: G: f4 Y  R  |/ e7 E7 e;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
( Y1 }  x' [0 ~& @  t* ^" N* E;; and initialize the traffic lights to one setting
- Q# X6 i& E! w  M' Xto setup-patches2 r/ e, x* k5 o2 w- S3 p  i
  ;; initialize the patch-owned variables and color the patches to a base-color
, q9 l- I$ ~6 ~( A  ask patches1 }5 H- t% W( R/ H6 I& `
  [9 f* x6 r- `5 M# b9 N+ r3 z
    set intersection? false" T  q; Y: t/ j8 f" O
    set auto? false
: Z( a8 {7 o/ u( K    set green-light-up? true2 m6 E, {: F* y8 M6 N, j. g6 F
    set my-row -1
' Z: Z5 x2 a. T0 P; D, k" `    set my-column -1
; x; N& x1 E: h# z    set my-phase -1" p+ ^% N$ f) y, z' r. o
    set pcolor brown + 3
. l0 c7 U$ L* ]6 t0 N' a  ]( D1 s; M: R" H7 s9 N
4 X) w, W( }. G
  ;; initialize the global variables that hold patch agentsets  Q' n) ?$ g7 w8 v" W
  set roads patches with
/ \3 O+ g, b: u2 _! D7 f% X) o+ U1 Q    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or7 c2 _! r/ m4 t: A) N" o& W" D
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
6 k, k) w2 ^0 B  I' M6 D  set intersections roads with
2 h/ h0 n2 H$ r/ J: \$ w    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and  o- V$ P% I3 Y4 c' U- c( ~
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
7 g* ~# x4 d  s0 z' q& G
9 R8 E4 }+ e  v5 q  ask roads [ set pcolor white ]2 R9 r! V/ }* g: N
    setup-intersections: P$ z$ h0 o; \- _, x& U/ O& g
end2 u" D  O! `1 ]  M  K/ r; }
其中定义道路的句子,如下所示,是什么意思啊?  T9 X6 N- d8 f/ b
set roads patches with8 f. F' Z! j, K( Y
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
* ^! m$ a- O4 l$ I    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
1 c9 J7 O5 T3 _; A$ H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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