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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。
3 V+ {! d4 n! I; m1 N. tnetlogo自带的social science--traffic grid这一例子当中,
+ e, K* w) G2 y* b9 b$ w, s+ Kglobals
# z6 ?3 s& q7 \, c: a3 p; E: R[+ z2 B* H3 {/ Z5 r5 C5 [
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
8 k7 J- K( G$ o& @; C2 Z  grid-y-inc               ;; the amount of patches in between two roads in the y direction0 h5 u+ v( V3 W' D! s. I3 a
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if8 V' w2 _4 x6 f. }# v1 H
                           ;; it is to accelerate or decelerate$ N7 H/ q: u5 m1 k1 Y$ i
  phase                    ;; keeps track of the phase
# T" L/ C6 g2 ~, I& J2 H' A: D. E  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure" p5 G! v0 u8 Z2 s# q- d& o% n4 ^. n
  current-light            ;; the currently selected light+ `: ^. t* n: a* @
, @* J& `" T( o- t
  ;; patch agentsets
1 X; d9 ]5 o2 }; [. K$ _  intersections ;; agentset containing the patches that are intersections
0 d( l2 G8 l" t! L( ?/ [  roads         ;; agentset containing the patches that are roads" u4 t  z: T7 W
]
( O, B6 _9 ~+ t4 q" T% V  n: t" }- J9 I% d" j, j# `
turtles-own5 y) C6 D& P" d
[
) I3 W( M8 o8 p3 N* \4 I  j1 A4 |0 }& d  speed     ;; the speed of the turtle- a7 y$ Z2 h$ f0 `# m
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right# [6 q: g: g9 _9 H
  wait-time ;; the amount of time since the last time a turtle has moved
' [- R6 z6 T/ V& O! g6 R+ R! c6 o$ K], P) O1 D4 a( ^

" j- T1 B) x7 }; {# A# _! Kpatches-own
3 S8 ~' a7 z4 y& L, b+ V[
1 I2 _, k* k) b- s8 ?  intersection?   ;; true if the patch is at the intersection of two roads6 w' J) {4 n$ E. S. h. I+ l, P2 g; `
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
- `0 i9 M0 V. \  b. ~2 `: t                  ;; false for a non-intersection patches.0 K3 D- f8 ]  o4 `
  my-row          ;; the row of the intersection counting from the upper left corner of the, P) c5 O5 t0 g
                  ;; world.  -1 for non-intersection patches.
- x5 u1 z) A% t5 {! t  my-column       ;; the column of the intersection counting from the upper left corner of the) {* q9 J" @# N0 `
                  ;; world.  -1 for non-intersection patches.4 W4 J# h3 X  x
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
+ T' v1 O9 H- u2 f# I) Z7 `1 t  auto?           ;; whether or not this intersection will switch automatically.2 N2 T; L( R5 B% L9 }$ a9 Q
                  ;; false for non-intersection patches.
" I6 z: i! S, K" N# |]
7 \/ l# t" ]9 L/ `. n5 }3 T- n  k5 Y- ]+ G9 _" R; m3 R
% j" G  _8 b6 f( Y
;;;;;;;;;;;;;;;;;;;;;;
# A7 q2 Z% b7 Y3 m;; Setup Procedures ;;- b! ]- z9 o; Z7 S/ X, l
;;;;;;;;;;;;;;;;;;;;;;# n  q/ Y$ a( R$ f7 R
3 `2 `4 Z# b. m; s/ N
;; Initialize the display by giving the global and patch variables initial values.
* [" ]& w' S# {;; Create num-cars of turtles if there are enough road patches for one turtle to
' E6 H$ ]9 V, O$ G/ a;; be created per road patch. Set up the plots.
* P" [: ~& b) f: h$ D1 h0 zto setup# g; c$ o9 c3 @, R. v. D
  ca# s2 H0 j, p  r' m
  setup-globals8 ^1 }5 a, W6 e. Q$ O

5 o2 H5 Y; E% n  ;; First we ask the patches to draw themselves and set up a few variables
0 M7 E6 y2 |" ~! n+ ?7 I6 C: z  setup-patches
+ g+ q- Q7 K- ]& _4 X+ k  make-current one-of intersections$ ^  h0 ^/ J0 t5 M8 O7 o
  label-current! _+ ]/ E5 B9 b

  y- p* D% e$ |7 v  set-default-shape turtles "car". J* v5 t! D* K8 E# B6 |

6 `$ [0 k1 y3 M! M  if (num-cars > count roads)  m5 M+ M6 Y1 u' q, f9 K
  [
; V. x- Q  J' ]- @    user-message (word "There are too many cars for the amount of "' D% l% `# U5 c1 X- n
                       "road.  Either increase the amount of roads "$ o$ C8 U. ^- e( u) l. t
                       "by increasing the GRID-SIZE-X or "( ]) t3 y  Z$ x; g. n
                       "GRID-SIZE-Y sliders, or decrease the "% `% N# Y$ q6 @8 z2 ~8 o# [& k
                       "number of cars by lowering the NUMBER slider.\n"9 p- E& v+ v* y1 x6 T
                       "The setup has stopped.")* _1 t4 T1 s6 V9 t( j" ^5 t' r
    stop
2 Z* n# a8 I# E8 p9 G4 C5 P  ]8 }. W# D. K9 h; M; G' s

5 I9 h2 m  y- E* l" B6 |: b  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color9 K: H6 k% E% a4 f
  crt num-cars
) D2 x5 K0 i; G4 D5 _4 L  [
4 a% H& V1 r- `6 e0 M    setup-cars
4 \- T8 ~' ]3 R% U9 B2 V    set-car-color5 e: h' h! R9 j" r
    record-data
; K* _4 b. L! N9 N  ]8 L. r9 D# \6 s$ y0 t' `! n+ O2 \

9 S3 T# n8 [" v! Z/ \  ;; give the turtles an initial speed  J1 L+ K  w8 o/ j4 m0 n, o2 W$ e. L
  ask turtles [ set-car-speed ]+ h% [/ {! i8 ^, N  C

- m/ Q3 G3 s1 x1 J9 R  reset-ticks' Z8 q- }; g% }, U. s' e
end
/ N3 K: `. v* b
4 C' p7 M- C: s+ j- k;; Initialize the global variables to appropriate values
$ h8 P! r( w2 x4 n& O* ]to setup-globals* z( ?/ f- t- A8 Z
  set current-light nobody ;; just for now, since there are no lights yet* p' x+ B+ z9 i3 d9 a
  set phase 0( k% h! W( @/ m& @, J5 A& M- O
  set num-cars-stopped 0
7 A9 e7 H# c8 J( u$ f  set grid-x-inc world-width / grid-size-x
: j( z: `# B- J: h% A  set grid-y-inc world-height / grid-size-y
! Q( V6 A' ~' ?* h% K: S3 ~, a
4 P. t" f- Z1 Q  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary, t8 l. [7 D+ Z# ?  U9 P
  set acceleration 0.099' `. P3 K) S" I  ?$ c1 @; u
end5 N( X- E' H( K

4 f. R$ ?$ f1 F/ m. v& k;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
0 J, D/ @- t' G; o/ h;; and initialize the traffic lights to one setting' p& J/ v& Z! E: X. l9 ?
to setup-patches
" ^' S7 S6 s' D1 X* S  ;; initialize the patch-owned variables and color the patches to a base-color
" M5 d, G# G% }" i  W; D& c  ask patches! ?# p% R3 G+ Q
  [$ g+ N- h0 i* |6 P" b7 \- |
    set intersection? false0 F3 T& ^, Z) s3 L7 `: p
    set auto? false
) o2 P# o$ Y  b) t    set green-light-up? true
& Q3 `; H5 V; U1 l    set my-row -1
6 @0 ?) s" ^5 }    set my-column -19 X' e; ?, _3 }' `* m- l; Q: y
    set my-phase -1
' a5 P% {5 G( e% {9 ?' ?' u- t1 ^    set pcolor brown + 3, g( X2 ?% T( P" a+ G1 H
  ]
2 `+ X- A9 w0 a0 D" }' V: O: Y' k; ~0 j. p6 g+ N. u
  ;; initialize the global variables that hold patch agentsets- [0 G+ D& T: Y, o. z
  set roads patches with
8 N: N8 c7 e0 B% z7 v9 X    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or4 D; W# [( z9 S) I" N# x
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
+ K- \! h% v( I2 ~/ w6 n  set intersections roads with- \: O4 J4 k* o
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and& r1 u0 [: G7 G" ^8 a2 z0 l. `  C+ E
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]+ p% a) `2 C; U
, R* l% ^1 M# w& |! N
  ask roads [ set pcolor white ]. ?; J8 S+ a3 \6 y: l8 s
    setup-intersections# c6 p( A; c  Z; L
end
9 ]  u2 b1 d$ ]; z其中定义道路的句子,如下所示,是什么意思啊?
4 s1 Q6 z5 h. @" K7 w7 P set roads patches with9 l( M7 e! |7 m1 j" ]! c
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
' b' \) ~, y3 `    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
2 ~) P: L7 e+ H5 x( \" 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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