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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。
0 A) T4 [7 ^  E/ o) M4 K) S- anetlogo自带的social science--traffic grid这一例子当中,
6 E# b6 Q7 o6 [6 ~, Cglobals
% o/ S* J3 C' `7 b. G7 `: l! J; F5 @5 ~[
* u/ n2 G4 u* D1 _, {: \* p  grid-x-inc               ;; the amount of patches in between two roads in the x direction) U: q$ P8 m) h1 v" q
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
' Q3 L4 x1 X. l& e9 u/ c  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
+ J( \- M2 J1 |! Y                           ;; it is to accelerate or decelerate& y) I' D0 t: P9 `$ w9 Z
  phase                    ;; keeps track of the phase
/ |# x7 K; q8 v  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure; Q+ \; f/ A& _8 S. r2 M
  current-light            ;; the currently selected light
4 r7 I# a2 I! P% P  u9 R% K
9 ]" Q6 M0 ~/ l# p- x' Z  ;; patch agentsets7 R7 l- t1 x( A; c! C
  intersections ;; agentset containing the patches that are intersections; [5 D+ |& p4 P6 C( w7 C
  roads         ;; agentset containing the patches that are roads
1 X* F0 \( Y! A' A& K]
0 u5 @- `  i0 y0 C8 Y# d& j$ ~
% a' }- \% R" J3 r& w. Iturtles-own  o, |0 s4 v* X( F$ [
[
$ _* g- v: V" L- B8 W# Z% B  speed     ;; the speed of the turtle9 b* g0 L" S9 G' t$ }  U
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right, _: n' ^9 {$ T: P
  wait-time ;; the amount of time since the last time a turtle has moved
. v$ J1 ^; t/ i, ?]* @) N' p) c2 \4 G' n
2 a# g& s( l. U& ?- g9 `# p- }
patches-own* [% Y! Z6 [+ k( W
[
+ V; ~+ ?" i, S1 E6 U3 I5 I+ i  intersection?   ;; true if the patch is at the intersection of two roads& T8 Q) S; c$ ~7 b4 }9 {9 o7 b  \3 r( Q- t
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.  Q6 p1 ?# E- M2 q6 i' `
                  ;; false for a non-intersection patches.
8 n& N9 i/ j5 _1 n8 v7 F+ C8 F  my-row          ;; the row of the intersection counting from the upper left corner of the
/ D2 @" D$ a" b8 U* g/ T3 g                  ;; world.  -1 for non-intersection patches.
$ l: G; q; d8 `" n1 Z  my-column       ;; the column of the intersection counting from the upper left corner of the
, g, x0 A3 `. e- j                  ;; world.  -1 for non-intersection patches.5 P) y2 o; o. c
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
$ [" l8 ?) y& z$ Z& ?+ k1 d  auto?           ;; whether or not this intersection will switch automatically.7 U6 l5 e+ O1 A* ^. @9 k7 o
                  ;; false for non-intersection patches.
2 Y$ i* z* T+ D2 _% i* W+ \]# K! Z$ C- v* S0 u3 q  Y
- O& e. O4 M! j" h! y
% v% }7 d% O* y' T- Z
;;;;;;;;;;;;;;;;;;;;;;- p1 K+ G* |! h: t1 `& i* O5 ^2 p
;; Setup Procedures ;;- G; X! t( P7 H/ |! i+ `, d8 Q- F
;;;;;;;;;;;;;;;;;;;;;;
: j& ?& ~5 R+ P* E+ U" h! ?. u9 e% j( Z1 _
;; Initialize the display by giving the global and patch variables initial values.
; @9 Y- o, Q( F! P;; Create num-cars of turtles if there are enough road patches for one turtle to! d' j7 ?9 {' R$ V
;; be created per road patch. Set up the plots.
! P( @+ f# S, K  ]5 Q) H9 Dto setup
* `' a) y2 a9 e( `' U  ca
: z+ v3 k) [3 b3 P( H  setup-globals
- H9 |5 M7 @. Q" Q# r4 n$ e! s4 l. o/ g3 F( Y* A) X- p1 E
  ;; First we ask the patches to draw themselves and set up a few variables
# `% _* ?7 ?. O- `+ Y( X0 j  setup-patches
+ @. Y: ]( z$ @: W7 f& t1 ^  make-current one-of intersections" j4 S$ P) k7 @
  label-current
9 S/ n4 B- J' H# J4 u7 D7 I8 U+ ?) W2 Q1 j1 a
  set-default-shape turtles "car"
. I! a  R, }7 q9 }' N) g( j
( P" _- g0 P! C) S  if (num-cars > count roads)
' W* ?$ b* y; S9 _& v6 t/ o  [! f" v7 `% C, P* C
    user-message (word "There are too many cars for the amount of "
; |) Z5 A2 Q" P0 t# d& e                       "road.  Either increase the amount of roads "
, G$ T% T: B1 O5 t9 s9 N2 Y                       "by increasing the GRID-SIZE-X or "
  g0 h  `7 }; ]' I8 P% I+ T                       "GRID-SIZE-Y sliders, or decrease the "
$ J% Y+ M+ w* t5 l/ e                       "number of cars by lowering the NUMBER slider.\n"1 C9 ~( ~/ Y; t3 ]
                       "The setup has stopped."); l4 |9 ]; K* T1 b( [
    stop# Z! [- q0 W! T3 Y
  ]8 U' k1 i, p# t' ?5 O1 C4 ?
0 t5 s8 S& i& n) r" U
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color* h  n+ P5 P7 a0 ^2 J7 j  r
  crt num-cars
. r, `, t7 B5 h# X  [
1 T5 @% O& c% _4 v0 U' Q    setup-cars
) x; x& k, a6 X+ x! l    set-car-color' r* f9 ~+ _! L0 {
    record-data! M3 H- r$ w+ m3 U- `
  ]
! [6 R& c5 N" e
5 R& f# s7 R! {8 p4 @  ;; give the turtles an initial speed
' c5 I) L" d, n& }6 d, H  ask turtles [ set-car-speed ]
7 E: @7 T, m; U* ^3 T3 a2 j
, ], M) P5 |% f  reset-ticks
+ W' `# v) B, Tend
0 ]- h" a; E# C$ E
  Q- i/ h# C( T* b) E% A;; Initialize the global variables to appropriate values& ^2 l; U3 t0 c; v, V# I
to setup-globals
1 y' D- P' _6 r1 {  i( \; j) M+ C  set current-light nobody ;; just for now, since there are no lights yet
' x  d. x9 t% }  set phase 0
" n8 z2 e* I* h! U) r( \  set num-cars-stopped 0
0 O& u' d. D. r7 e$ O$ C  set grid-x-inc world-width / grid-size-x: ^$ c; j3 e8 ]4 [- v4 i5 q- v
  set grid-y-inc world-height / grid-size-y
8 u( k' C: `2 w7 O
8 h" G6 t1 D* @6 j" \  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary8 ~6 M4 D& @& C2 q' D' r
  set acceleration 0.099
1 V! J7 I8 k( C% lend
# Y+ S0 i& t! W! Q3 c" N. b9 i! X1 l" L  J/ q
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
" G' t- q. b" ^; O;; and initialize the traffic lights to one setting
; L( w( F) D& W. Tto setup-patches; q: ^/ d$ y% S5 |
  ;; initialize the patch-owned variables and color the patches to a base-color0 B" f+ c: B, S! d7 C% @5 L
  ask patches
9 I; @1 w8 e+ q4 X, i  [# [9 ^+ j/ a3 Y8 k
    set intersection? false
; N! ^; I! P- ~% K8 q9 |6 g    set auto? false
/ h4 U/ Z4 w" v: V7 D1 }- F    set green-light-up? true! F: E0 s# J8 R
    set my-row -1
/ `1 t; i; N1 o# B2 x! y, m& D' c9 O    set my-column -1
. X$ L0 l- _' H# M  n, |) J/ k8 P    set my-phase -1
+ N) G) P4 q- H  Z    set pcolor brown + 3
) ~% ~2 S3 G! M) J  ]
+ k6 f2 V( [7 ], e" l, R5 s: Y2 v; }+ _5 U; r& W0 S
  ;; initialize the global variables that hold patch agentsets
7 h! v, f- ]1 l$ s5 `; N! M  set roads patches with( r& j8 O, w8 u# q( I
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or% d/ D% U- F0 B8 N
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
6 Y/ Q- n( O3 ?& w  y% ?  set intersections roads with! M9 Q3 d! d7 ~* X
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
% H9 F/ Z  I1 ?1 s, u$ {. Z0 E' U) Y    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]9 T2 W+ z( X. i7 U% y

$ C! i2 |# O1 a& G' S  ask roads [ set pcolor white ]
* D$ Y% E* v9 |7 q- f    setup-intersections  i2 w$ Q' l( q7 D- c5 L% b
end
0 x" {& X2 b- r. A- o& R其中定义道路的句子,如下所示,是什么意思啊?
% B+ \" m+ m: J; m; Y2 M set roads patches with
/ u6 g, f& V9 U8 o9 G! g    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or7 Q: {& M# G' j$ L
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
4 M0 L6 O# N9 z8 j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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