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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。! L  O4 X3 V: G3 g4 X+ I3 [# k
netlogo自带的social science--traffic grid这一例子当中,' R3 s; p# S- L+ x& m
globals1 |. E" A! S1 e
[
+ v; Q3 }/ w# m- k  grid-x-inc               ;; the amount of patches in between two roads in the x direction6 }, @$ C9 T/ d9 u2 M0 ?- s. u
  grid-y-inc               ;; the amount of patches in between two roads in the y direction; P6 V! ?8 ^5 j/ x4 U6 ]
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if0 i1 W1 Z+ k1 g* X
                           ;; it is to accelerate or decelerate
8 b2 L# o; m+ D! d8 Z  phase                    ;; keeps track of the phase
# O3 ^8 l* j4 U. a' f  {* o+ f  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
' |: V: M  u0 V0 m% t  current-light            ;; the currently selected light& M$ a$ c% D! T' d" B
# g* ^* Y9 Z. e) ^( r
  ;; patch agentsets
. W& P8 j0 U3 c- p: q  intersections ;; agentset containing the patches that are intersections
8 @* s$ P0 V9 p9 f6 ^0 B* B  roads         ;; agentset containing the patches that are roads
3 n7 s' P0 D' S]  g1 n4 R, I8 B) v, M9 ?; \" k
- w$ K* x( d* g; E! |- ?0 C
turtles-own0 N6 M9 J/ I7 @* h1 T, h, {4 c5 Q
[
  X5 C' |; i: A; k2 x; Q0 K  speed     ;; the speed of the turtle  O2 r4 ]; z4 T3 [# W7 T
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
; B/ P# l' b  n, i  wait-time ;; the amount of time since the last time a turtle has moved  ]/ W9 c+ `7 ]- ^: l
]2 h+ L3 b+ @8 F
! B- R/ ~! d+ x' q( O1 q3 y
patches-own& C0 r+ S% o3 ~* S
[3 c! C+ ?0 ~% i7 q; K$ `% S
  intersection?   ;; true if the patch is at the intersection of two roads* O6 P. P( Z: Y& w
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.% }- y5 V/ P- h& B
                  ;; false for a non-intersection patches.  i' e) c% m) ], ^
  my-row          ;; the row of the intersection counting from the upper left corner of the
: |* x8 h- |/ Y+ i                  ;; world.  -1 for non-intersection patches.7 R3 K$ Z1 L9 Q* }7 ]( Y6 j7 Z( m
  my-column       ;; the column of the intersection counting from the upper left corner of the) M0 e8 h! v3 f. C
                  ;; world.  -1 for non-intersection patches.
# ?% A4 L9 x1 q( t+ a  b4 Q5 g: l  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.2 c) a7 P' Y0 p
  auto?           ;; whether or not this intersection will switch automatically.- P1 ?8 U+ H; n6 |* e
                  ;; false for non-intersection patches.9 |; ]# Z6 q5 N) ]8 z; ?4 y
]- V8 G8 J# ^4 Z" H# ~( A* u) [
5 b5 H& f. ~4 R! f/ R: |0 x" p- Z& x

  a1 r* P# D! C" ^% O7 I& L3 q;;;;;;;;;;;;;;;;;;;;;;
* f' O7 @4 X0 u;; Setup Procedures ;;
* I; J/ J! W% ]4 b, ^' ^;;;;;;;;;;;;;;;;;;;;;;
6 K; g: k" v: `5 E' @/ W" A$ j3 z- {
* l2 ~! o' c# L5 J  Q5 U6 y1 F2 s;; Initialize the display by giving the global and patch variables initial values.9 B! P, D) d5 E, l
;; Create num-cars of turtles if there are enough road patches for one turtle to6 v/ I' O" K: B0 o
;; be created per road patch. Set up the plots.# _7 F/ |3 f# Z
to setup
0 }1 J2 T& ~4 v. ?- D( T  ca+ i" C* e$ Y, V  ]+ g; N3 |
  setup-globals' S: A/ M( D4 `3 D
. C0 C: h6 z7 e7 Q" C) G% q! \
  ;; First we ask the patches to draw themselves and set up a few variables
  A- _/ O' P! H% b  setup-patches
! n6 Y- l% x9 v6 D/ Y! W' k  make-current one-of intersections
0 Q3 @4 m( m9 K  label-current( d8 P( a: @/ `
' }- V  t7 k1 Y
  set-default-shape turtles "car"0 s8 B0 N, V8 x7 f7 V& G
# X8 t) [( |3 n( P
  if (num-cars > count roads)
( Y/ `+ d! a" L1 O9 H$ }8 x- M  [8 i* p- P# E' i' J
    user-message (word "There are too many cars for the amount of "4 K/ l0 D9 k+ s
                       "road.  Either increase the amount of roads "4 C7 K! [. W/ V, {, ~# Y  E; ], X
                       "by increasing the GRID-SIZE-X or "
) y- H0 u& T1 X$ A                       "GRID-SIZE-Y sliders, or decrease the ", p1 U/ X! f0 ~5 D; S
                       "number of cars by lowering the NUMBER slider.\n"
3 b9 A: ^9 G* W" M5 S                       "The setup has stopped.")# ^2 v9 t* P( O# U6 A
    stop
& m# I! N; M. R. h  `8 W  ]
% }* b# C/ V& n) ^5 `: N! Q/ f: I' }) a/ S( k
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color0 ^3 L* y6 ^1 B( s/ a9 d+ o2 Z. b
  crt num-cars* W0 W  U$ t( `' a$ M' |. j
  [
" c/ m, g( X, |* U6 j- \3 p& L    setup-cars% M  I& Y5 X8 U) c
    set-car-color# O5 S. s- ?% P$ ?0 c
    record-data8 p0 x# v. D- M* t  v; Z
  ]
1 v0 \) R, s) Y6 k6 |
' m0 R- M$ d, T: K8 N  ;; give the turtles an initial speed
7 J! U% E* u, g% D# @: J, b  ask turtles [ set-car-speed ]
; L" v2 ]$ N" p5 _9 q& l. q3 P+ Q9 C- E2 `5 i
  reset-ticks  b7 W5 d' s; M0 T
end
! y$ ~. }; c4 N7 ~; N$ e& }- I, @
0 ~- p  s1 N& @, J;; Initialize the global variables to appropriate values
# k2 @9 r2 x, @! ?. yto setup-globals. R) J6 V, U7 y0 W6 s9 R
  set current-light nobody ;; just for now, since there are no lights yet" i9 \9 {, F) X2 V
  set phase 0
+ ?! h* a5 u% e) N' w  set num-cars-stopped 0
8 l. L! k  l4 L; ]2 E  set grid-x-inc world-width / grid-size-x* ]. z0 E1 \$ Q- Q: p# `9 a$ o
  set grid-y-inc world-height / grid-size-y$ U1 ?+ L+ F$ U- h; Y( P4 d

* m0 T3 q! r3 O& u' J3 ?% c  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary  I, L( f+ Q4 Q
  set acceleration 0.0990 a4 \' a3 F" l/ `1 O* D/ U+ Y
end
5 L7 c2 ]6 n/ h; Q0 i" i4 p7 U8 F8 I
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,+ Y& X( Z2 }. O7 G! D% f( C
;; and initialize the traffic lights to one setting
3 l/ B* ~" l2 j& O1 Wto setup-patches
. ]1 l" Z3 X. h# q5 ?  ;; initialize the patch-owned variables and color the patches to a base-color
" Q& }! Z  y6 H* _- N: g  ask patches
% o  }3 I% c& x9 s1 u% h" H  [. N$ o3 z& v" g, c2 \% @) T. j
    set intersection? false
: I+ r" f5 T- r( O; H    set auto? false
& `! M7 m) i& d! [( K5 w. T5 O    set green-light-up? true* v5 W. }  W: ~9 ^, y
    set my-row -1
2 Q$ b7 |: Q8 q2 M* d/ O4 w- z- t7 ~    set my-column -1; q$ G  H0 B  a7 q( S
    set my-phase -1  Q1 j# V5 X3 a: y4 `
    set pcolor brown + 3
2 r9 ^0 ~# a$ y; Z! `  ]* `; R1 N3 g0 u& x/ C8 Q

7 G6 e  E- t  T# H/ L  ;; initialize the global variables that hold patch agentsets
4 e: |, \% _3 A+ d* b4 m! R  set roads patches with$ x# n) B, Q  K5 N! j$ W
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
9 r4 v! M* r) {# u4 \, i    (floor((pycor + max-pycor) mod grid-y-inc) = 0)], i* ^* |! J* ?' M- u0 X: V
  set intersections roads with- V! T! a$ _& I6 X
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and, T& G( ?) N6 V+ A' u" ?
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
, x3 C: @7 d$ r( p
' Z, k5 {$ |( j8 O0 f( L( [  ask roads [ set pcolor white ]) H" [2 ]1 e: G: x9 M
    setup-intersections8 T+ ^7 J9 ~: i% c0 b
end
, V8 M7 @  p: ^, G" W: t其中定义道路的句子,如下所示,是什么意思啊?, K. e* f. ?3 B' u7 i- X7 _
set roads patches with
/ s# G( ^. v* E0 u( [    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or% y5 \! N" }+ h& h2 _. X/ f7 ^
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
$ J' V$ f3 s3 N# R: 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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