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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。* v. [% M. j5 W( L3 T
netlogo自带的social science--traffic grid这一例子当中,1 Y, c5 d! }; T7 i% Z
globals9 z) O4 j9 }! m% H* P) C
[
# O1 b$ @3 `2 _# ?9 Y* B  grid-x-inc               ;; the amount of patches in between two roads in the x direction
8 a3 C6 o" Y# e/ v$ ~  U7 S  grid-y-inc               ;; the amount of patches in between two roads in the y direction
4 H1 H6 j2 [3 L. M( p  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
" g9 F' d: P& q7 i+ F4 F9 P6 x& d                           ;; it is to accelerate or decelerate
3 D- k3 ^# N6 C3 k6 B/ U6 ]  phase                    ;; keeps track of the phase
' N! ]& U$ X3 F5 d% l  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
$ I# r: `0 [5 i0 y) R5 b- V. X  current-light            ;; the currently selected light% d, F7 v* z) O' J7 M: |

" [- S) I7 U* `  ;; patch agentsets: b* ~) P- D& B* c8 f# h2 F
  intersections ;; agentset containing the patches that are intersections
( e) y9 N/ w" c7 _% J  Z  roads         ;; agentset containing the patches that are roads: u( a# U" }' O5 G; F
]! ^- z( J% j& G5 h3 S

7 Z% C1 E4 d1 Bturtles-own/ ~3 A" H, g2 _! g% A$ X$ t/ |* N! h
[
% X' b+ y  w) B2 i6 I# ^8 D  speed     ;; the speed of the turtle2 z: S  m6 V4 o7 _
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right0 d+ H5 H2 m3 f; m
  wait-time ;; the amount of time since the last time a turtle has moved  B, T3 u2 e, @$ J" R# t
]* J+ |2 f) \7 Q
6 F, U6 U  ^7 `3 W) B! S7 J1 t, C
patches-own0 M& G) F7 S7 R0 x& L
[% z% d+ Q2 ~2 K* a
  intersection?   ;; true if the patch is at the intersection of two roads
. b" ^% j/ D- d9 f* b$ C) Z  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
2 s: G4 x7 j; P/ r# g. x9 y                  ;; false for a non-intersection patches.
( E; |; W. K) @9 u$ y, i  my-row          ;; the row of the intersection counting from the upper left corner of the
- V- X- F% G5 _" B  `2 p                  ;; world.  -1 for non-intersection patches.0 _- D% \) J, ~( a& r. V% B: t
  my-column       ;; the column of the intersection counting from the upper left corner of the
  `% b5 t& H" e5 |6 U7 |                  ;; world.  -1 for non-intersection patches.
$ Q% q) ^2 ^8 h3 P  n  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.5 f) @4 n  @0 P
  auto?           ;; whether or not this intersection will switch automatically.
1 y# J+ Q9 A, z2 I; X! [                  ;; false for non-intersection patches.
1 q5 o6 A3 g% a: G]& J, T4 L! I& e; ?) s& g- s4 S8 v

2 w' T1 g: A% w2 x( ^3 u% o; f3 n7 n3 m
;;;;;;;;;;;;;;;;;;;;;;) x! h3 Q* G1 A' j3 C5 R, @, v
;; Setup Procedures ;;) S* Q6 `7 P& H
;;;;;;;;;;;;;;;;;;;;;;
5 x5 ?! A3 {* S
% L, G5 e# A9 m;; Initialize the display by giving the global and patch variables initial values., C, J* t1 Y9 ]/ i8 e
;; Create num-cars of turtles if there are enough road patches for one turtle to
. b, r4 L) U# a6 r;; be created per road patch. Set up the plots.
5 t+ _: r; U- Bto setup$ _" P5 T7 l5 i( o$ w$ @& O
  ca" z. P5 G1 v8 ?
  setup-globals
  I; u1 f" j& V4 E
) x' ~  ]$ z3 x( |& J5 F  ;; First we ask the patches to draw themselves and set up a few variables. ]- G; m% C6 e: q6 [
  setup-patches
, A8 B5 v) h- S$ B) m* J5 e  make-current one-of intersections2 S9 d  O6 g( \) F* S
  label-current# |* r7 k' n* k$ {5 D

6 K1 X% t# y. U  set-default-shape turtles "car"
$ k' b* W( s6 q* `' ]+ b6 g. I. p$ p& e8 I4 s4 G
  if (num-cars > count roads)! w8 l. L& m0 r
  [
, [5 ~- }1 ]8 F1 V/ `0 {( j9 S1 q    user-message (word "There are too many cars for the amount of "$ M' F; }7 l& `1 g
                       "road.  Either increase the amount of roads "/ N( U( C  P" b; w3 L5 D8 p
                       "by increasing the GRID-SIZE-X or "/ `& P+ t& v! r$ H5 \2 F, D1 d' c  y
                       "GRID-SIZE-Y sliders, or decrease the "
0 a  H; v- X% G0 q                       "number of cars by lowering the NUMBER slider.\n", U4 p$ U2 Q  V4 Q& X; T
                       "The setup has stopped.")) S( D' E. d' B4 W  v; G, L9 i& t
    stop
" M) q  H$ I. H9 c/ K" J4 D4 ^5 }9 ~, g  ]
; y4 |3 {8 z% I+ G6 [+ o0 C* F4 ~$ R( {' [
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color! Q/ a/ K8 F" a- X
  crt num-cars. l8 L- t! |2 B& ~' u7 F& c  K
  [+ D' Q/ d# H' {% [3 y
    setup-cars
: a7 F) U/ H, p5 y    set-car-color
: k- S5 o. Y1 E$ m# z& Q' ?    record-data9 w' y/ o/ d* A  {
  ]$ ^; Y8 r  x, k/ S: D! K
' q( j( m( a9 z7 o
  ;; give the turtles an initial speed5 l: f: g% p- }) a
  ask turtles [ set-car-speed ]
6 Q1 P6 A$ U) W# b* Z( R9 b" L1 p4 i6 }; n2 \% b
  reset-ticks$ m3 b$ w7 M1 w& Y. B
end6 Z9 B- a! w* V$ k! K. y4 i* h: z7 C' q

7 E$ R8 q! h# E1 j;; Initialize the global variables to appropriate values, g: H: `* Q6 r/ O# ^6 x
to setup-globals. k/ K" E3 f8 @) A" l! l
  set current-light nobody ;; just for now, since there are no lights yet
. s# P; t; ?2 u3 r! l3 d. ~* O. u  set phase 0
1 C6 O* c$ F/ ]4 n6 z! l4 s6 U! G" {  set num-cars-stopped 0
  {1 l( u2 I8 P! x' \/ q  set grid-x-inc world-width / grid-size-x5 i  Y7 o9 T, u
  set grid-y-inc world-height / grid-size-y
2 H8 V" B9 P/ ?) |! k2 V. x0 G5 M2 v
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
" h& r7 t% y  j% B+ E4 k1 {  set acceleration 0.099
# ^- D" \6 |9 Q2 I& j  R/ @! oend4 ]) w" c4 ~1 n# O* F( M
0 V. d; B/ q. r6 Z* x: N8 [1 P; z# l
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
8 F) B% U! T& l! C2 `5 @;; and initialize the traffic lights to one setting
! U! J! \# n' ^7 l) g; |& i( ~to setup-patches
: I; z) r2 R# L1 u4 \! }+ y  ;; initialize the patch-owned variables and color the patches to a base-color
/ n) l* s, H6 Q8 V+ V  ask patches% t: U. [( ~: \
  [' _6 _0 \1 D. x/ u9 ~
    set intersection? false
4 V' ^' L# O7 u; n% J7 A2 u    set auto? false1 r. O" F: `* }6 @0 B! \- o+ U
    set green-light-up? true. T( H' _- r+ e* I
    set my-row -1
5 H8 v- l. j+ ^3 c4 D3 T    set my-column -1
+ [: I3 d, r6 a1 I/ S9 ?    set my-phase -12 B7 N) Z0 K  c( E5 }& ?' j% d, p
    set pcolor brown + 3
1 \# [8 M" O) e& L. M) y9 H: \/ Y$ Z  ]
1 Q2 e5 e6 r. u4 @
) J2 c0 W# x6 }* O8 G+ A  ;; initialize the global variables that hold patch agentsets
4 p) ^/ g; ]5 b4 x  set roads patches with( W5 T/ B! \- s- H  ?! E
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or9 p: H7 c$ h1 r/ B4 y9 S
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]1 p. F$ f+ e" B- Y
  set intersections roads with
5 o3 x: [) i" }2 E& I) Q. ]0 i: v4 j    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
3 h& A8 E- Y, c6 T  |, I8 V4 D5 H$ D    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]5 \, u) i. }- t" e# W
0 l, U1 L; U5 n
  ask roads [ set pcolor white ]' j3 |% n* `4 ~8 z; h4 A5 e# Y
    setup-intersections9 K5 a! ^6 D* w! p0 H5 s, K# u" F, h: r
end+ D6 n% C* ~9 k* Z6 n4 |
其中定义道路的句子,如下所示,是什么意思啊?3 c6 b- D7 M/ C  r3 P9 u6 N1 C
set roads patches with+ K  n& P- F0 F$ P) j6 E
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
9 p, E6 ^0 j8 H    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
4 P0 E# t7 n0 F9 Y* b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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