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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。
+ J8 i+ {, t! w! t) i3 M+ \$ r- Anetlogo自带的social science--traffic grid这一例子当中,
) u7 c' B! K2 x4 e+ b8 \$ aglobals6 n. L( F) o, A8 _
[
/ V6 r) _% ^! Q7 N% k: [  grid-x-inc               ;; the amount of patches in between two roads in the x direction; l. o! r  i, a9 Y
  grid-y-inc               ;; the amount of patches in between two roads in the y direction# A( u3 L0 ^& a0 L! w$ c
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if% t' y6 s& S! T/ X2 E
                           ;; it is to accelerate or decelerate
0 R" r7 S1 C4 D" `! P  phase                    ;; keeps track of the phase4 |" L' ?0 H5 j7 U
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure& N2 r2 o# m; }( ~; S! E
  current-light            ;; the currently selected light
1 P/ t- ]2 U! J- q* K
2 A, Y; K3 l7 g2 {! c  ;; patch agentsets
. d2 z2 _. `& F# w+ P' ~  intersections ;; agentset containing the patches that are intersections
+ h6 e" B. |: b7 |& n  roads         ;; agentset containing the patches that are roads
5 F0 Y. `# v$ o, T. D' P8 ~]
7 \& m3 {0 w7 c/ ~
4 f$ A" E' m: c: C7 Cturtles-own  U2 Z. S! y1 _1 U: i& ]  U, Q7 C
[
2 u1 Y, }+ b4 w" h8 E9 d& l  speed     ;; the speed of the turtle4 z( J* S: c4 Z6 t& a
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right3 C7 Z4 [* Q$ P- T
  wait-time ;; the amount of time since the last time a turtle has moved
! C7 T! V- `* b  R* V0 D5 L]; p) O' ^. ?% f8 y9 A& L7 \* c
6 W0 K3 c1 Y& {' f) W$ {1 }! N+ N
patches-own: @2 p- a( Y- d& `+ D3 E2 V5 [
[6 t; U  U2 ?2 w/ ?- B
  intersection?   ;; true if the patch is at the intersection of two roads
0 j0 r* Q& s7 E  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
. @/ W8 _! ~) X% f                  ;; false for a non-intersection patches.+ Y( G5 ?& g! o' `1 j0 ~
  my-row          ;; the row of the intersection counting from the upper left corner of the
2 M+ D7 l* {( i  d5 ~# X6 h                  ;; world.  -1 for non-intersection patches.. D5 z4 H% x* z+ Q
  my-column       ;; the column of the intersection counting from the upper left corner of the- o( M8 v) s# `
                  ;; world.  -1 for non-intersection patches., f6 F+ }# M) W7 O+ c- d9 @
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.' v8 k" w) C4 Y/ Q; {9 |, b
  auto?           ;; whether or not this intersection will switch automatically.) V  e9 y8 k9 r0 @) K
                  ;; false for non-intersection patches.
: c2 \; U) i( h( O. y]" a9 Q+ R: {' ]3 ~2 K. l! J9 |; Z

1 n  ~# I/ E( y8 V( ]+ E% R& J2 h4 W* `; Z
;;;;;;;;;;;;;;;;;;;;;;! O8 F1 P9 q0 m( M1 Y. b
;; Setup Procedures ;;
$ y# z1 ~: P6 f: s9 i/ _8 j;;;;;;;;;;;;;;;;;;;;;;) A, T3 C( b7 J, u! ~

8 W$ w! D: ]0 v0 w' e5 |6 Q7 A$ V* Y;; Initialize the display by giving the global and patch variables initial values.
) d. E6 F6 b6 b, J;; Create num-cars of turtles if there are enough road patches for one turtle to- K% `: S0 p* |- ^& y! ^" B8 {. N; t
;; be created per road patch. Set up the plots.  q  m5 s' |+ f0 M  ~
to setup
8 t2 D+ s  ?( R" u9 y5 O0 _5 s/ @  ca
" o6 Y$ m( ^& Y3 Q! {$ H* @8 c  setup-globals
. T- N- A# v/ s7 z# S" W6 e
' g* N6 o! H  p  ;; First we ask the patches to draw themselves and set up a few variables- t4 v" j" P) N8 P4 j+ T! F& }
  setup-patches
% X+ s6 l+ G) l# Q0 A: L  make-current one-of intersections
, v* i( r" m" z+ Q0 b  label-current
1 @6 J* h3 I/ q9 X+ ^. }! b' ?! A3 i3 M* I, h4 J: E6 |1 R1 N
  set-default-shape turtles "car"
" g& M: [7 [% J) }% L# \
' a% Q0 @. c/ h2 p: x+ B' ~  if (num-cars > count roads)# ^# p. G1 D* k+ i* R
  [
  g' G% B- P3 n- b    user-message (word "There are too many cars for the amount of "7 h6 A) |5 c1 l
                       "road.  Either increase the amount of roads "- A5 b0 v1 G* E
                       "by increasing the GRID-SIZE-X or "
! F; Z1 O$ Z: l6 H/ P2 c                       "GRID-SIZE-Y sliders, or decrease the "0 c4 Z( c! Q# Y" v8 ~  n
                       "number of cars by lowering the NUMBER slider.\n"
: P' @9 \3 H4 Q4 d- U( g                       "The setup has stopped.")+ @# B; I( _4 P: c" U- u% [
    stop
; \' T: B* M+ M; N" z0 k( O  ]& V- S2 U9 |' z" |

+ U6 L2 q2 Y0 G3 [8 V9 ~  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color$ S( |  g' x! \+ z; Y* P, E, B
  crt num-cars
  W  c0 r) F7 |  P, }( u  [2 R! C4 l# E: N) U; g. |8 _
    setup-cars
  }- ]* W" k9 I9 a    set-car-color
1 U8 G& I4 u. B. u$ Y; r8 D. k" I6 Q. J0 B    record-data
9 @6 g+ K; C* T' O; h% p2 Q3 L1 |2 E  ]& B7 ~1 f9 D% v& }4 K  i
: w% S# n* ?, Q8 B: v/ t
  ;; give the turtles an initial speed
- E* H! s2 a# s  ask turtles [ set-car-speed ]# ~' `0 ?' V2 [& O

$ c; I4 X4 [  r5 q- t! H. j$ A  reset-ticks! V- R8 E- t6 B+ _
end9 N' l# c( ]! G
# J9 E8 d# [0 ]0 t) q" L7 b
;; Initialize the global variables to appropriate values
7 w2 |! O; d( f. Cto setup-globals( m: x: w6 ?% U4 U/ x% Z
  set current-light nobody ;; just for now, since there are no lights yet% f. O8 k: `- T: M
  set phase 01 `# Q: M9 f1 p4 A7 R- [- M# B' o6 p
  set num-cars-stopped 0
+ }2 e  m. U8 `  set grid-x-inc world-width / grid-size-x: E. V3 _' Q! \8 u# Q& I) M( A: Z% o
  set grid-y-inc world-height / grid-size-y2 m6 G1 u* i$ E/ j

0 ^  K" e$ O8 B; |2 {% k+ h3 r  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary: Y4 D- Y$ a! `4 r6 X
  set acceleration 0.099
: S* \3 S* ^- l/ O; Y' ], u/ ]end
0 ]5 E' N9 ^' [8 _& |( y7 A
& X' O: F' G/ C;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
/ }, L0 ^8 J6 e# [;; and initialize the traffic lights to one setting8 m$ ?" W6 w! ~% a
to setup-patches* t) Z) k8 d. m* i3 b+ u: v
  ;; initialize the patch-owned variables and color the patches to a base-color
3 W9 z& y* H; E( u6 x  n  ask patches; v! ~  M# L( R) g1 ?
  [- H" x: Z* ]% J* _. C
    set intersection? false
' E1 Y* k, K9 b; [' ~, X4 o    set auto? false/ L8 U1 j4 M1 D. ]: r
    set green-light-up? true
4 K5 P; c" B  a3 Z& c( Q    set my-row -17 D7 [8 S1 I3 F) s8 V3 n
    set my-column -1' m$ Y4 ]8 F6 S
    set my-phase -1
6 k# H7 R8 T" c& b5 u1 T4 L! a    set pcolor brown + 3
1 h' B/ }. i* A* d1 V  ]
3 [& Q; e+ \$ N3 C# V( Y% J. f
9 V5 B" o$ b) H6 C& a! c  ;; initialize the global variables that hold patch agentsets
$ K% [# N: ]2 L  set roads patches with
, l7 ], I2 ?4 t* U" a6 c1 o    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
4 e/ H5 a3 z! |6 a% \9 D! }    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]. W% l1 e/ L! c6 f
  set intersections roads with
  M6 D( h; A7 {+ R  q$ E, p    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and7 M/ P) d- L0 j
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]. s! ]; j" J$ F+ O3 @/ y
1 Z! u9 @6 R3 W' b# J! x# c
  ask roads [ set pcolor white ]
/ O% ?; N) U" W/ C& @    setup-intersections7 O+ M" k, Q; g
end
6 j& y$ @4 s4 a: \2 D: d. `6 m其中定义道路的句子,如下所示,是什么意思啊?
. E7 o: Z, U2 A1 A' y& C+ j set roads patches with$ L6 Z7 p1 g" W
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or/ T; \6 l3 u; w. B4 F  g* T
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]) z( ?7 o/ l4 p; ^/ Y, w
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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