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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。
2 R- D! o3 K9 s/ `" M9 inetlogo自带的social science--traffic grid这一例子当中,
- ^5 B  h# W( W0 @2 L# l: vglobals
9 I7 Q) Y0 R/ u, j[1 a- G( h8 M1 _3 W0 }0 Z9 z
  grid-x-inc               ;; the amount of patches in between two roads in the x direction6 _$ B0 I5 C" a2 t8 g  W( b# n
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
) p; |0 t6 x" Q  B( q, Y7 ~! O  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
% W" c: J. B" |7 J7 }2 ]! E                           ;; it is to accelerate or decelerate$ r3 L& T; D/ e' O5 L- ]4 q9 b
  phase                    ;; keeps track of the phase
6 _7 s# t& T! k- F  A  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
2 K6 K4 n6 {7 j0 v! M+ |$ Z8 }3 W  current-light            ;; the currently selected light& x  W5 D3 a8 [& E) L7 B
. n  `: B# h% \8 X4 r
  ;; patch agentsets
# O$ k( d7 u) D) a* z  intersections ;; agentset containing the patches that are intersections0 D' q7 D- l; z; k; H
  roads         ;; agentset containing the patches that are roads
( V0 t& m2 ~1 @6 a/ A; x]
: E( [, R) W2 G9 J1 x' j! H: {! z; ]6 s  A3 q
turtles-own
9 Z5 j. }0 n/ K' u9 F& {8 M[* Z* j& F  i, M8 m) X- G( k
  speed     ;; the speed of the turtle
1 X+ U/ r8 g% o: N+ v  up-car?   ;; true if the turtle moves downwards and false if it moves to the right; s( g7 T. A, F
  wait-time ;; the amount of time since the last time a turtle has moved
8 s$ S6 p! ~" U( u  p1 z]8 R8 _. A* c, {

7 g1 S. |4 J, x+ ]) Q1 `& Dpatches-own
- _, O# i, T  r& M" y: a5 ^6 w[
* P, w( E' y' i7 x5 b  t8 h; K8 `  intersection?   ;; true if the patch is at the intersection of two roads
+ q% R2 m% C7 F8 \! ^  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.4 b  N7 E0 R) `- u  n% w
                  ;; false for a non-intersection patches.1 ~2 r, B4 [4 N/ p( D2 K
  my-row          ;; the row of the intersection counting from the upper left corner of the  M) t4 {6 \$ I* O; |) Y2 b: ^8 Z: }5 i
                  ;; world.  -1 for non-intersection patches.
! a* f; O# G( Q" j+ K% D1 q/ {  my-column       ;; the column of the intersection counting from the upper left corner of the
; P5 P+ @  j# D                  ;; world.  -1 for non-intersection patches.6 A! h$ v* V; Q4 L3 ]$ m3 E
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.3 U0 z$ W0 E* M1 I: e
  auto?           ;; whether or not this intersection will switch automatically.
  x3 w! L, |, y7 ]                  ;; false for non-intersection patches./ s6 o# V' ^7 U) r8 y& d$ K
]
, @" ^& q/ L$ e' z4 ^, n
. r0 `3 h0 t6 v6 l% c* M: b0 C; N# K' l
;;;;;;;;;;;;;;;;;;;;;;2 e/ S6 i( K! N; D
;; Setup Procedures ;;
2 j5 {( u1 u2 d: z- I;;;;;;;;;;;;;;;;;;;;;;
' x. j7 j  R, c$ v. h% k- [5 u/ d( z4 }5 `' p; ?' ?
;; Initialize the display by giving the global and patch variables initial values.  z) s% Q, C2 ]4 y
;; Create num-cars of turtles if there are enough road patches for one turtle to9 b5 H% l9 M5 l- Q4 r
;; be created per road patch. Set up the plots.1 c1 ?1 |. ^% t9 n- I9 }- H- D
to setup3 m: b  Q4 U, |$ t: ^
  ca
% D0 B- @2 w/ R% v! I, Z  setup-globals! V5 O  n+ y/ y. E) q3 q
% B9 y% O# S/ Z% r" |% A- B
  ;; First we ask the patches to draw themselves and set up a few variables* P5 s) E) p, P* t' M' \
  setup-patches
  ^4 e6 X, W4 ?! g9 v7 J  make-current one-of intersections
4 w& u8 [* h: |! R; H  label-current" ~4 I' S5 R! }9 m( ?

( u! Y3 U9 C- h8 h3 D; i% N! c" p  set-default-shape turtles "car"
0 E) j2 p0 i- I( Z& V4 p4 M) Q* {2 @& W9 H' v
  if (num-cars > count roads)
" |5 L- A* p- F" G  [" |- n8 T* A, i& I5 O! c
    user-message (word "There are too many cars for the amount of "
; I7 B: b& T& N5 L+ X" C( {* ^                       "road.  Either increase the amount of roads "
5 O4 G% P, W% L( {( {; ]; |                       "by increasing the GRID-SIZE-X or "
5 v/ R/ T5 G* C" \6 y                       "GRID-SIZE-Y sliders, or decrease the "' k5 l- V7 L# z9 C! n3 Y8 Y
                       "number of cars by lowering the NUMBER slider.\n"/ s- F& `% {+ D4 O$ K
                       "The setup has stopped.")5 U5 Y6 u6 a, K$ W* {* N; c  y; j( i
    stop
  Z4 b; w% z8 a3 U; J4 b9 S1 F  ]
& T" d* j. c  C/ Q! o2 s% A8 u8 }) H- y, `; j
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color7 D8 I8 U1 I* Y3 H" U& m' K6 L( q
  crt num-cars
$ q- M3 A* A. ~3 `% ^+ k- p/ [  [
6 g& p: Q4 Q# y3 K. J/ o    setup-cars
% a1 ^  p' p7 ^1 R- v    set-car-color  |2 T) X; p( ?
    record-data
* W. h$ c9 s, G& g4 ^: {0 l  ]) a5 U. j- I" g
9 ~* p+ z- p( r, k% Q; U
  ;; give the turtles an initial speed7 D" e* `- u! r  }1 {$ E6 q
  ask turtles [ set-car-speed ]
- g( h5 p& ?5 B! i! G' e: K, O
  reset-ticks
+ }$ d# z# T3 eend+ E( r7 [: t' ?( g* n

! y- i' x- J, o$ b$ F+ H- K: \;; Initialize the global variables to appropriate values
4 T5 K- ?2 J- `1 yto setup-globals
2 z& c# L  v3 x  set current-light nobody ;; just for now, since there are no lights yet
1 c+ K" Q! v: W  b8 I  set phase 0% |8 P' Z: S( \  Y" t, r  y, R
  set num-cars-stopped 0! Y' V' u$ x" O% J
  set grid-x-inc world-width / grid-size-x+ O! ]/ P, @' Q2 A5 Z
  set grid-y-inc world-height / grid-size-y% _% G* c1 U0 y' N4 @
8 N3 d1 v8 z. |
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary( O; Z, O5 l% z0 I+ o& K: ]& P7 ^
  set acceleration 0.099% F1 n+ ~( y1 i" x9 f/ t5 o" V. X
end/ _+ H/ L+ I. d- p6 S
4 k: D: Z! q6 H' A: K3 Y/ F
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
  `" P& X" w5 M; N( Q4 u* K;; and initialize the traffic lights to one setting0 a8 B* |" Z  t
to setup-patches3 k2 {& D) g2 f9 C) S) Y+ a
  ;; initialize the patch-owned variables and color the patches to a base-color+ [% `' X) ~- ]  _3 l/ @
  ask patches* E, b' I8 Q4 [3 }- t8 b. A- J  {
  [
# Y) n+ Z: j4 k  `" {3 d    set intersection? false
; }7 g0 k. P: t2 F    set auto? false
% i" U. u5 [3 Y8 \+ `5 C* Z9 N    set green-light-up? true* s1 s$ i' Z4 N- c/ u5 S, P
    set my-row -14 k3 B! X& e7 h5 h
    set my-column -1
* K0 q& D% `* m8 U    set my-phase -1
9 H* M- e' s8 I: B' v8 R    set pcolor brown + 3
" i0 m/ u% X' y  M6 K' j: F  ]
, C" x# C% G* p" e8 G& b
1 E9 {4 k$ R- E1 m+ g: ?  ;; initialize the global variables that hold patch agentsets. G0 g6 T5 D' A: k1 E' E) u* G
  set roads patches with
# ^" R; m1 h4 \( v# O3 q7 P    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
* [3 l) W) U  _3 I: U2 R& M    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
/ Y6 }8 u1 r. j, O  set intersections roads with5 r8 N% A  S3 f9 p$ i; n
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
' c' K# a) I$ D2 A4 g    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]( l! L2 V, d. `- A" Z
1 ^: ~, ^: L5 x
  ask roads [ set pcolor white ]
, `. ^6 f4 x; o2 {3 \    setup-intersections, Z, o/ w! k6 w+ I* |, e4 `( \' B
end; K! T- G! Q. P7 I( x- M
其中定义道路的句子,如下所示,是什么意思啊?
/ X: \3 E- n) v$ F, E  @$ t set roads patches with& T2 n% s0 _+ t4 P) t
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
4 T% [  r' U6 g8 h    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]  _8 \/ H3 Y4 g- K6 |( H7 l5 `
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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