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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% j; I  U6 Ynetlogo自带的social science--traffic grid这一例子当中,5 e: N. @8 O! ^' {/ |
globals
  _: ~; K! P' d9 z; ^" m& F2 ^: G[# O0 }- b: h9 t% c0 [& t4 X& }
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
$ E- l6 V4 B( ~+ X  grid-y-inc               ;; the amount of patches in between two roads in the y direction
6 b/ R7 s7 p2 V  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
8 q0 L4 q, G% Y, b" n3 @3 z                           ;; it is to accelerate or decelerate
& N  X6 `9 `3 g4 \2 K  phase                    ;; keeps track of the phase, \. g% c' v' F$ @/ i0 q7 c
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
% A' [8 l' p/ C( `' n" H3 n0 [  current-light            ;; the currently selected light$ H9 M: n# [" n: @

( G- g" n9 v, U4 l  ;; patch agentsets
0 a# s- V2 z7 J5 ]$ r& n  intersections ;; agentset containing the patches that are intersections
# |/ I- Q5 s, D  roads         ;; agentset containing the patches that are roads/ q8 D5 ?4 e6 v% [# A1 |
]
8 L8 P" E( t* F# z1 a( _+ i2 M" X  l; n
turtles-own9 R! z7 }( v' a- \$ f0 N
[
; Y! c+ i) W  q: I  speed     ;; the speed of the turtle) w( v- I: Q, X) v3 b& u; C4 I
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right+ k: O$ h+ M  M- Y
  wait-time ;; the amount of time since the last time a turtle has moved' T* v3 {& G0 ~& q2 f( A
]* i9 d/ q4 n0 g

% \5 C. g# s, r4 T, W0 U5 apatches-own
+ V, o$ P' e! ^6 }. F0 v) a. ?[  R& V, C9 M  l& U. t6 z
  intersection?   ;; true if the patch is at the intersection of two roads
& R; G3 b9 h- W6 K8 `  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
9 E% X3 {# Y# G  Y) ]* ~                  ;; false for a non-intersection patches.% }" B4 |. P! M  u1 r! z% a! z( `
  my-row          ;; the row of the intersection counting from the upper left corner of the  s/ |# o( b" i( k
                  ;; world.  -1 for non-intersection patches.
) V& M1 Z+ t- \7 Z, O- E  my-column       ;; the column of the intersection counting from the upper left corner of the
* e8 n+ x2 [  N& P3 W8 Q                  ;; world.  -1 for non-intersection patches.+ a% Y) L% h3 r2 b: a
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.7 R' ~3 K6 m5 F8 c: e% X- \2 Z/ {
  auto?           ;; whether or not this intersection will switch automatically.
4 P. P. |* M; ~7 v+ F                  ;; false for non-intersection patches.
$ u% c& V! Y. N4 l( H]4 r) Q7 D: `) v0 i( e
2 n! I9 F+ j$ v% c% K
  r( \* a: }4 {" E' k/ e
;;;;;;;;;;;;;;;;;;;;;;! A/ b, y) f; @2 p3 \" u
;; Setup Procedures ;;
9 l9 J1 q+ M! P% b) @;;;;;;;;;;;;;;;;;;;;;;
2 b9 T5 y1 R0 C$ v: o" O8 K+ F0 C- U! p2 N) o; e, @
;; Initialize the display by giving the global and patch variables initial values.
/ ]( ^6 k' g: i& ~# C' _5 i, A;; Create num-cars of turtles if there are enough road patches for one turtle to5 Z( g* J) ~: u7 Z  J% O" T
;; be created per road patch. Set up the plots.; d' h! a2 G' B& U. }2 W& Q
to setup
) [) @* h; V8 D$ N4 L  ca
, Z. X* O4 i, V0 h+ [& X4 T  setup-globals
- x5 P/ y( p4 X& N* L6 ^' M" c- D; ]
  ;; First we ask the patches to draw themselves and set up a few variables
5 y7 i& d2 n: y1 @( T4 m6 ~  setup-patches$ k% J+ s/ S& |! U& ?
  make-current one-of intersections
9 M" N! n6 I: S0 {" S2 F  label-current" a2 U6 K: w, }% e; E4 `

! \5 x: E# F; L; D  p  set-default-shape turtles "car"- l. v: U' E; r0 @7 T8 u
4 {, _& Y) z  I9 e9 E
  if (num-cars > count roads)2 ~5 |) a3 J+ |: }, w
  [5 }1 X' m! P; N) n( \) |/ c
    user-message (word "There are too many cars for the amount of "
; A7 p( O7 T' F                       "road.  Either increase the amount of roads "
/ h) ~3 }6 K/ R& j                       "by increasing the GRID-SIZE-X or "
; d4 S( \) a) G# q7 J                       "GRID-SIZE-Y sliders, or decrease the "
; |0 m" N. _0 s  Y; X# O                       "number of cars by lowering the NUMBER slider.\n"; R+ n1 E" C: j$ s6 X, a4 I% @
                       "The setup has stopped.")
4 ?( q$ s7 O6 y6 }3 W% t6 j+ ?    stop' ?  n3 t) w6 d
  ]
4 z$ L% |4 F! ^* b8 z7 V9 V2 K: I+ ]4 L, w! \/ W9 N7 C5 S
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
+ n+ w. o5 j. @+ r2 V8 G: v  crt num-cars
  Z. m8 j: T3 H2 d" h6 `- \7 Y  [
: |7 R: {) @6 C' e0 f# M    setup-cars
( N4 O$ l2 f; K+ t2 c% n. f    set-car-color
$ {7 z+ g- D& H  L3 S    record-data
$ L) B9 c0 R, _& K2 p# V  ]
3 s9 P0 d. O- K4 I' [) @
1 r' h8 @: r1 b" X/ b  ;; give the turtles an initial speed- `( Z) w( ?' k) ]( Z' j! J5 h( C
  ask turtles [ set-car-speed ]
) E! h9 D( Q7 x
* k6 U6 d. \5 P  reset-ticks
1 b  v' p# M5 p; H7 J! f; Nend$ T! T# x4 V1 i

; T4 b7 f0 n- j( |;; Initialize the global variables to appropriate values1 `5 A9 B. g6 \, y. p! i- m
to setup-globals
8 [( y3 }3 G# k4 N$ b) A  set current-light nobody ;; just for now, since there are no lights yet1 Q+ d: @8 u9 p" V7 V& d  S1 N
  set phase 0# ]8 j. E7 b. |3 @+ ^2 c
  set num-cars-stopped 0
, |. E4 H( h7 o3 \+ o2 k2 B9 X% `  set grid-x-inc world-width / grid-size-x
* Y% C1 N+ C( m, j  set grid-y-inc world-height / grid-size-y
# @; v) N' e% m3 S
4 N# v, e. p+ w4 z: {  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
9 B) ^0 S: ^% l. Y8 t  set acceleration 0.099
, h' d5 \9 _4 [" [" X3 H/ rend8 T  Q( n9 Y/ x5 C
2 _$ U% h3 w; t: ~9 L
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
8 }: {$ t0 n4 z$ }' c: N;; and initialize the traffic lights to one setting
  J" K, }' f, Pto setup-patches& Y4 Q6 ~  {3 S- Z
  ;; initialize the patch-owned variables and color the patches to a base-color
! x! U! G: N$ j7 A, H+ T- P. m  ask patches2 @3 F9 B$ W5 R  i' x6 \
  [4 H) P  b2 S7 g& D5 q7 d
    set intersection? false
% A3 p8 B; c* s7 D% Y0 g& l    set auto? false* b$ \  a* b) b0 a0 C! \% @7 ?
    set green-light-up? true
' \' D2 a9 v" M6 c6 B    set my-row -1& L" C* L* R/ j; ~$ H0 w0 U
    set my-column -17 u) v6 M1 o0 X, H& r2 a; y9 G
    set my-phase -1
. q1 y; C  t( W- \3 T3 h: m( u    set pcolor brown + 3
* B9 k9 p0 g4 F* y% T( q  ]  {! ^% N# a( Z0 D! ~
! U2 P7 f! }5 g2 o8 x3 T/ n: \
  ;; initialize the global variables that hold patch agentsets
9 F5 T- i* E% v. G  set roads patches with
3 H0 Y) y/ E2 Q    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
* t6 j' I2 M* w2 H, |: N9 W& g    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]. x  ?  r8 j2 p3 \
  set intersections roads with4 Z$ K$ Z) e+ e- J$ b, _) ^# C3 @$ s
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and+ g5 Z' K- K9 f7 y
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
+ R2 s) t4 G* u. p4 t8 H9 j1 `8 |8 \7 @6 Y1 [
  ask roads [ set pcolor white ]& j; W4 `3 {: Q
    setup-intersections  `$ B1 I4 n. `$ s$ z0 U. A
end
6 Z. E9 b* J8 U# }' Q. B: a其中定义道路的句子,如下所示,是什么意思啊?; W) ]; ]4 R0 N. l- r, @( i
set roads patches with0 D5 \9 \! d9 b5 y
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or# F. x3 }% m  A* M
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]+ [0 r" `' f0 @3 D% T* g+ Q3 G9 m
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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