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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 D) s$ V# ]( x9 t, E7 [  c- x( Rnetlogo自带的social science--traffic grid这一例子当中,
& E( q$ q. f3 i/ V: x- r' J2 n% xglobals
3 y: M! q8 d/ p0 K) a6 U[# _' Q! r( O" p
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
% u; s( p5 H" }' H" \  grid-y-inc               ;; the amount of patches in between two roads in the y direction
! ~6 ]1 A) D+ c  acceleration             ;; the constant that controls how much a car speeds up or slows down by if. g8 J0 t+ {: F6 P+ w0 G# L" n
                           ;; it is to accelerate or decelerate  v7 |  v( @8 \6 t$ \
  phase                    ;; keeps track of the phase
8 N# f, P0 d/ S3 h# z5 F5 s, t+ R  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
  s9 T/ L0 L; |0 A3 \4 H( c  current-light            ;; the currently selected light
' A, B" m3 G* j9 t. n
$ r6 s8 H* N4 C- I2 D8 _: x  m  ;; patch agentsets  O" t7 V& Z2 G8 U9 w
  intersections ;; agentset containing the patches that are intersections: M- H* \: v0 s. F3 U) A* q, A( {
  roads         ;; agentset containing the patches that are roads
+ Z8 ~: h" f9 ]- a& p' G$ Z]
( M7 m8 \3 _4 m' k. T" v( {7 \, a9 J9 H( B
turtles-own/ C' m: K/ i% p, k5 }* \
[
. @& \# q" T! `) M) T+ p+ u7 W  speed     ;; the speed of the turtle2 M7 R- @) o1 D6 @
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right6 ?$ Y5 {& b0 y
  wait-time ;; the amount of time since the last time a turtle has moved  I9 {9 `; B8 P! _7 S1 y5 E. Z: R
]' s: {& w+ }% D; p- g$ J) }

. f: z2 }! e# t+ Y' n* Gpatches-own6 l% I+ N' @2 F; W
[
( i! z. v3 L" P8 Y- V8 y+ A+ u  intersection?   ;; true if the patch is at the intersection of two roads
5 I0 o$ c! n* f* p# C1 g  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
7 @& l0 u0 ^6 i. ]1 W                  ;; false for a non-intersection patches.
" f, v$ p3 r, {  my-row          ;; the row of the intersection counting from the upper left corner of the; q) `" l: W9 t& R  ]% P" d
                  ;; world.  -1 for non-intersection patches.( u. {) L6 V8 D
  my-column       ;; the column of the intersection counting from the upper left corner of the
* L( I1 |, e4 ~. S9 B$ E. i, z4 e                  ;; world.  -1 for non-intersection patches.9 L, ^% A( ?3 t% U! X. @! g4 p& X
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches./ E  X1 X& Q: O+ ]8 K4 j6 M) B
  auto?           ;; whether or not this intersection will switch automatically.
& E0 L6 p7 |& |                  ;; false for non-intersection patches.+ ?' q8 c" i8 c0 m
]
4 U& A/ M3 e6 @6 V4 V( `2 N1 h* k
! l7 s/ w5 E7 I9 U& v
$ i: L* K- m+ `0 W5 Q( i2 K;;;;;;;;;;;;;;;;;;;;;;
7 w! H: ?, I9 q2 I;; Setup Procedures ;;
% a9 Y- `3 e0 i;;;;;;;;;;;;;;;;;;;;;;
$ o4 L+ V" E2 ]/ p! r
" F3 ]3 a, t7 B+ G;; Initialize the display by giving the global and patch variables initial values.9 y  o& J& J' H' z
;; Create num-cars of turtles if there are enough road patches for one turtle to- x3 c: O8 e) o" o( X: f: z& Q+ `
;; be created per road patch. Set up the plots.
( B7 z7 k- ~/ o1 c* _0 q0 jto setup
! J( C( X" x6 {' |( A; d5 S: `- v  ca
% ]9 U0 v- p; t. c! C9 L3 b  setup-globals3 \3 G+ {/ U" e- W
* ~' H, a2 d! Y- k* A6 R
  ;; First we ask the patches to draw themselves and set up a few variables
! q; `* q+ P; s) y# b) A& t! J  setup-patches
  W, y1 u0 k0 g- K  make-current one-of intersections
. e- C6 z6 U$ N1 L$ X  label-current% Z( i* L3 N- j7 R& V# p, y2 K! j

# [: w+ m" |4 y  q  set-default-shape turtles "car". s. F3 J9 I; I0 N3 {( t8 X

' Y( v2 e6 N1 V1 Y( v' G. O  if (num-cars > count roads)$ I" E/ C  e* M' t$ U
  [+ Z1 k( u/ o' Y- |1 @/ H1 F
    user-message (word "There are too many cars for the amount of "
# v0 t+ U* b4 A7 Q. O0 n                       "road.  Either increase the amount of roads "
% r7 `4 f7 G" y& F- ^6 V                       "by increasing the GRID-SIZE-X or "
. o* `% M/ n; m  i$ n6 {2 U                       "GRID-SIZE-Y sliders, or decrease the "! h% ~$ v6 N$ |  k. _" U3 q! X6 Q
                       "number of cars by lowering the NUMBER slider.\n"5 n$ ^" z8 b; n! V" e0 n9 v  L" y
                       "The setup has stopped.")
: W: J! F9 u' b( C# S; \    stop  @: @8 w" t7 p! E
  ]
% }( L# ]% V+ x8 C8 G. y- D  {) W2 e# j0 E
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
. K- |( f, w9 C! f5 ~& ^  D( q  crt num-cars% C9 O3 b1 ]/ {' s
  [
0 v6 I( ^2 R. Z! a1 i4 r    setup-cars
, z( n& Q: \, r4 ^    set-car-color
* i# t) m' T; X6 R( Z    record-data
3 }. j7 m# m9 g$ _* j* G( S2 y- \1 ]  ]- [8 ?+ C' y$ D2 a  [6 L
. [. E  o1 n4 \. G0 _
  ;; give the turtles an initial speed. G. K1 h) C- u  D% r( k4 V! |
  ask turtles [ set-car-speed ]( m* V7 _$ h7 ~" W- C+ u

4 q( }* [0 v7 p9 c! r. u- t0 `  reset-ticks- K+ ?, d* I4 \: ?6 G& ~2 q8 E1 @2 e
end
: A! x( w9 w, x7 {" Y- {3 S5 f$ \. Q% A8 D( R
;; Initialize the global variables to appropriate values
& v: M% V1 k4 sto setup-globals
% q; I: K- u# R' z  set current-light nobody ;; just for now, since there are no lights yet! D5 A) a: _1 H* F7 |4 L( M9 m% g; f
  set phase 0- c4 U' B+ L& s; n9 Y, e
  set num-cars-stopped 0( s+ d! p: C& b6 {) q2 T1 b5 r2 K# l
  set grid-x-inc world-width / grid-size-x
+ J. G8 p/ A' M! Q, b* F  set grid-y-inc world-height / grid-size-y
' h& k3 _  q5 ~' d, I( l  ]1 Y9 n/ `
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary5 R& g2 _. n# x" Q8 m; {
  set acceleration 0.099* a/ B, K% x* C$ }  D" r" f
end4 f# q0 N; L; ?

- W  i. I: O. _2 G;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
. a* i+ k) W5 n: T' K) D# M;; and initialize the traffic lights to one setting
* j, ^* Z1 A4 E: ?* K9 N' wto setup-patches
! ~( m  l5 c+ H3 U  ;; initialize the patch-owned variables and color the patches to a base-color# ~$ E/ X$ V2 O/ W. r, L7 a
  ask patches$ ^0 e0 c, C5 W' B2 D% S# x
  [
, \2 Y0 \$ h; Z5 u* E- M    set intersection? false; O+ S! \+ a* m3 ~) ]& c
    set auto? false2 `4 A' ^- O1 S
    set green-light-up? true3 N! F" D' _, p1 h' _5 T
    set my-row -1/ c/ W& v5 X, ~$ l
    set my-column -1
" }1 z4 i$ A0 t, r' c  d; l    set my-phase -11 c1 T0 F  @3 u" w% V* A% }
    set pcolor brown + 3* B' D& y8 p& I9 M! S
  ]
8 ^4 O! j( J' O2 ^6 u( I6 g
; z& V6 g& O/ \( Z7 }) d  ;; initialize the global variables that hold patch agentsets: q) w8 c' o+ ~* }8 |. G( \
  set roads patches with& b' O: l6 o! R; [/ u; L1 g4 v/ |% ^
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
8 O6 [2 E. x1 b; t7 n  ~# ]$ N- Y  j; ?    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
- |$ Q' Z! n1 E  set intersections roads with1 {/ f7 v4 v' R# {$ Z
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and% L, O# U1 N1 K% J5 t9 H
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 m5 H: J$ A& t2 w4 \

7 c/ e2 m4 Q! v0 q4 Q0 I  ask roads [ set pcolor white ]
6 K+ b) S( d" J" C0 v  N- C    setup-intersections9 U, J- K: a  a, @' w
end
0 i/ f* U" Y( s! C- ~$ P$ f- C其中定义道路的句子,如下所示,是什么意思啊?3 B5 C  t* o# d9 m+ }1 {1 U. T0 c
set roads patches with8 u# N+ j) t. a$ P4 A
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
3 B' ~. e7 J" C' z" g1 a    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]  q4 q# a; ^7 n3 [7 V' o% r7 O
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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