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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。
- y9 x* X' q$ Hnetlogo自带的social science--traffic grid这一例子当中,5 S: D& B. o! j6 E" Q
globals2 Z; A6 i: T) o
[
& |+ |3 E9 I- }( k( x* K  grid-x-inc               ;; the amount of patches in between two roads in the x direction
/ b% f9 L9 i+ O2 o$ B5 D1 P  grid-y-inc               ;; the amount of patches in between two roads in the y direction
, e* u% c- z& b  acceleration             ;; the constant that controls how much a car speeds up or slows down by if  r. F  n" Q, ~( V1 T# A/ k# x
                           ;; it is to accelerate or decelerate9 A3 W+ |" a% n( K4 ?5 B. w
  phase                    ;; keeps track of the phase
  D0 @% M$ A  }% x: G4 X  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
1 R; w0 n' g* R; K  E* \; o; r4 f  current-light            ;; the currently selected light
2 E& J8 M0 M+ q& _" J6 Y" b. U* \" g* }2 Z- I' L
  ;; patch agentsets
! L8 t1 `" x3 d9 @7 `- v! R) Y  intersections ;; agentset containing the patches that are intersections7 i% ?! l. v% b- v  ~9 r
  roads         ;; agentset containing the patches that are roads8 t  j3 ^6 @+ Z$ S1 u5 C
]
4 F. K$ e, o: D- q
* n# L7 v' D' w7 T( F7 l  D- sturtles-own
7 A( w, ]1 D, q& K9 c2 {[% X; S9 L+ L5 D9 C  L
  speed     ;; the speed of the turtle
6 g3 q/ c; x/ A. r4 L  up-car?   ;; true if the turtle moves downwards and false if it moves to the right- d5 Y( x: l% Q/ Q) U
  wait-time ;; the amount of time since the last time a turtle has moved
& h) r) {" f4 f7 J3 F]; V3 _) S( w& O" I$ Z/ O2 H

5 J" r- F1 ^2 y3 \  @) X; Fpatches-own0 ?0 j$ s, t5 f% u
[
4 O9 W0 [: t+ W" F  intersection?   ;; true if the patch is at the intersection of two roads
2 O: L- v9 p& D) M2 y  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
% O/ O7 v, l8 m                  ;; false for a non-intersection patches./ Q. S! p% i: n7 i, x3 Y* d4 y1 K
  my-row          ;; the row of the intersection counting from the upper left corner of the4 K, Y! \  E: Q! g; C7 |* S( ~
                  ;; world.  -1 for non-intersection patches.
( V# e# m& \" y3 q  my-column       ;; the column of the intersection counting from the upper left corner of the
- m4 b6 L' G7 K* e                  ;; world.  -1 for non-intersection patches.# {) ~, Q1 L% g' t4 }, t* t
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
. K) l/ V+ L. \6 K, g# C# t  auto?           ;; whether or not this intersection will switch automatically.5 N: W1 v7 S6 N: s9 q
                  ;; false for non-intersection patches.
* @( i9 E7 s8 j6 L& u]
# c# J0 p- t- {7 A3 V8 t9 r9 c/ w6 z; |

* c7 n! V" k# y- c  h;;;;;;;;;;;;;;;;;;;;;;/ m; M8 P! z6 v8 t
;; Setup Procedures ;;
5 F+ ?8 X  T0 Z" ^* B  R, l;;;;;;;;;;;;;;;;;;;;;;
* [* N3 F/ Q5 i: ]  @8 K' V/ X; C/ I
;; Initialize the display by giving the global and patch variables initial values.4 Z) m- b& l' ^
;; Create num-cars of turtles if there are enough road patches for one turtle to
: E9 d. _/ ]: O/ y- z4 k0 s3 ^2 {6 h;; be created per road patch. Set up the plots.
6 k9 b8 S4 _- k6 i* g3 l4 ?6 Lto setup
5 ^. M: v" o7 ]  ca
$ B# B: k/ m% |) h- o  setup-globals
& E) u4 L: c. B2 h: ~( V8 e! o
# m  s* X3 F" _* r. G  ;; First we ask the patches to draw themselves and set up a few variables
! X' w8 O( v/ E! ^% N  setup-patches
( ]" h' H( ]+ m& j; `# e4 m  make-current one-of intersections
: \# B7 d% I1 A) y, b  |  label-current
4 r# c% f  [% N2 z2 l9 o0 h& z. G& g
  set-default-shape turtles "car"3 c& `( W9 ?' ?! |9 H
/ e( k) z+ c4 s9 i; ^  W3 q0 ^
  if (num-cars > count roads)" q1 P0 r6 H  ~5 N3 z
  [. E* `% c, H7 k  B6 B6 z
    user-message (word "There are too many cars for the amount of "
" l" G. G/ H4 J, W$ y" u# Y- \3 W                       "road.  Either increase the amount of roads "
+ c# G! Y3 h% @                       "by increasing the GRID-SIZE-X or "
: A# l3 A8 U1 p: Y                       "GRID-SIZE-Y sliders, or decrease the "% q# l3 R8 H$ [1 i/ g' r
                       "number of cars by lowering the NUMBER slider.\n"
) H+ r2 P7 h' O                       "The setup has stopped.")
2 q# |. k8 T7 ^- z/ V# ~    stop
( N9 g7 l; l, E( R0 B* q  ]
4 H' Z& y2 h& g6 \9 {- L; S3 }1 E/ \; Z2 A
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color( ~" M; v9 Q/ \* b% q# H
  crt num-cars
( d7 o; D. f; I! ^  x  [
* U, ^1 P% ]: h7 T    setup-cars
; d5 W" u0 M1 G' S    set-car-color
- g5 y! w2 n# V/ [    record-data, O  C7 K$ o% H7 t" z, V+ {0 P$ s5 e' }; e
  ], s  D' [. B2 Q- F( w

6 L+ M  b/ M" l5 R: `7 K  ;; give the turtles an initial speed
) d0 g* N: D2 H+ |  ask turtles [ set-car-speed ]
* ~2 ]& f  Y, B  a! \9 X9 o  k# ^
  reset-ticks( U$ |6 _  q3 u$ P6 C. Z" k
end
! I& k6 I  k& p+ `6 K3 `# n& X8 B8 T9 _) w1 P. H1 W8 e1 F! X
;; Initialize the global variables to appropriate values3 }$ {  c: C$ h
to setup-globals
! _0 c$ X# u2 C3 H3 ^+ H  set current-light nobody ;; just for now, since there are no lights yet
$ z8 g) I; T/ t& r  set phase 0  x% p6 ?2 F* x
  set num-cars-stopped 04 m$ a* T6 }# |4 i: o/ y
  set grid-x-inc world-width / grid-size-x- y; @7 ]3 Q7 q4 G9 ^, o
  set grid-y-inc world-height / grid-size-y
, Y' x8 w$ [' `9 }- ^
5 `2 y2 T5 f* {$ j( \3 Y' G# O  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary2 F- z1 o' r8 H( e1 C7 k
  set acceleration 0.099
* ?# f: c7 B- o, F  c8 `9 _* Mend% Z' j" H7 j$ q
( K- b- U7 w- N; P
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,& @- M- E& n( \8 m7 K6 c- G
;; and initialize the traffic lights to one setting
% c* o+ ?" |6 i& D" q* ~to setup-patches$ t8 A1 a% z' p: R0 v
  ;; initialize the patch-owned variables and color the patches to a base-color
) h, z9 h' t6 Y% @2 V8 S  ask patches
; K8 T2 B5 m; {) R; w* W  [
- |9 ?  s1 X6 z* v' N" X! v    set intersection? false( I2 m. O* ]+ `- V8 r& v6 N& |2 w+ K
    set auto? false
) `! Q! a: _- j8 q    set green-light-up? true& ~6 b' \% g5 n+ R
    set my-row -1
- o9 L3 {: p( v    set my-column -1
! F5 L* |2 D/ ~8 j! J    set my-phase -1
, F' P$ }9 K: ^; Y! {' Z) E    set pcolor brown + 3  s# M. s" I8 l5 K
  ]
  G$ X: L' I- i( f* [" r! A& Q; N# W2 p  g4 \# Z- E8 W
  ;; initialize the global variables that hold patch agentsets
$ g0 L: P- m8 T. j  set roads patches with& _' h9 T* h& {/ ^. v
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
& |& u  [4 _7 D, Y    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]! v7 \9 K; }+ g
  set intersections roads with4 y5 p' h$ R/ u
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
$ ^! ?) u: @7 V7 P* T6 W    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
* s* j: k9 l  }. y, s" X3 L/ N! k& F2 `+ z! Q
  ask roads [ set pcolor white ]. N0 L- W. B6 [* [7 q/ ]  R
    setup-intersections) M& A* w. A6 a8 W: |# K" S
end
, V6 d" W% N4 S2 F7 c其中定义道路的句子,如下所示,是什么意思啊?
1 w" q$ \2 L; r& t# Q4 M set roads patches with2 ?3 r3 L% a# J! h" O. F; `8 J
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
2 M, p; q+ F; [  m: y: l    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
1 k  R' y5 L  \) E) T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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