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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。
+ f  k6 ]6 H( L7 s% r2 h% V% ?7 J2 Nnetlogo自带的social science--traffic grid这一例子当中,) D* D/ n' A7 h5 |# f- q8 |
globals; f0 m& c4 t" g0 E9 ]* h
[
% m" J1 f' C2 P9 _3 J  grid-x-inc               ;; the amount of patches in between two roads in the x direction$ V& {/ o# g% F! s' p' r, F
  grid-y-inc               ;; the amount of patches in between two roads in the y direction9 {0 `  D* D+ G$ _% `- w
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
% C1 b" P; G) w* s, S                           ;; it is to accelerate or decelerate
% t# d" r, [3 B: C6 p  phase                    ;; keeps track of the phase' ~* {6 [- U0 X$ Q. f& T9 Y
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure; p4 ?  {% L2 O
  current-light            ;; the currently selected light
- A7 H$ Q4 d1 l2 m9 o* k) h5 l+ o4 n  E/ E  I2 c
  ;; patch agentsets  \6 b& `! z+ }; b
  intersections ;; agentset containing the patches that are intersections. j9 {' O( G/ T* H) s: ]
  roads         ;; agentset containing the patches that are roads
. q7 D* D) m2 z; r]$ @6 x- i) u: E3 E- h9 J% v0 y

3 Z. e* Q% A& ~0 l' W0 W; `turtles-own4 O" o2 M6 `/ _
[" g/ ~# T; ~# s5 c# ?
  speed     ;; the speed of the turtle- s! a9 S. |* F: ~0 ?' p
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right0 B/ z$ T& ]' f1 w, c1 U* z
  wait-time ;; the amount of time since the last time a turtle has moved8 ^2 u# b$ T! H# n: W. t( {. \0 ^
]" v/ g6 q$ M! b1 @* y. x, H
8 b; r' G; R& j7 n
patches-own5 Q  T6 x4 Z% h
[
/ H# ~5 u" c- P; Z  intersection?   ;; true if the patch is at the intersection of two roads3 [" C% W8 ~! N! E% X
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
; H1 k% M' L4 w( S+ Q: ~/ H                  ;; false for a non-intersection patches.
. Y& x% q" n  u* u, `6 \  my-row          ;; the row of the intersection counting from the upper left corner of the
  A+ A9 v& x9 a  Z! x6 o                  ;; world.  -1 for non-intersection patches.
' M7 M$ M: V4 l2 M7 Z6 K% _  my-column       ;; the column of the intersection counting from the upper left corner of the
# s9 w7 d/ C' W2 u% i! v                  ;; world.  -1 for non-intersection patches.. h3 y$ r/ {# Z+ {! D0 Y
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
8 m5 s8 i0 T% u- R  auto?           ;; whether or not this intersection will switch automatically.% r5 F  ^5 H, H
                  ;; false for non-intersection patches.
5 K/ A  M2 s# K8 N6 u7 j, E3 v]
3 G0 a" C: C; ^; I7 [7 T+ O5 [& V% v! L8 S
0 }6 o% M- ?# x& P% M  Y
;;;;;;;;;;;;;;;;;;;;;;) o% h9 p+ I& X  `
;; Setup Procedures ;;
- f6 F: X& j3 l0 S5 Y;;;;;;;;;;;;;;;;;;;;;;
: u, w) A& @7 y& W7 _: a* u( V* D1 s: \  W" f8 o7 _1 d; Y2 Q8 N
;; Initialize the display by giving the global and patch variables initial values.0 w8 v7 |5 P0 k; R0 ]/ T
;; Create num-cars of turtles if there are enough road patches for one turtle to
9 g* x! g/ M0 T. Y;; be created per road patch. Set up the plots.$ K8 u' ~- v$ e& ]; g* G" Y
to setup
3 R* Y& s1 x/ \7 B  C, }  ca2 `) E9 I" E0 n; n. J
  setup-globals5 L/ c7 Y6 `4 U/ a( Z$ t8 l

4 M4 V, C# B* Y8 F; R" w" V9 h, j7 ~  ;; First we ask the patches to draw themselves and set up a few variables' V8 J3 |4 k1 [0 ^2 u
  setup-patches- D( v- N9 P  p! @& f5 s5 Y5 G. @
  make-current one-of intersections
8 q+ E* I3 ?; [7 ]2 f  ]  label-current
! |' }7 S+ |. Q: u: Z- f# I  p! w' Z
  set-default-shape turtles "car"
, r3 T+ _: f6 b8 }0 y, Z
  j% G4 n5 @% o; D& ]2 F+ I4 ^  if (num-cars > count roads)# k, o& Y1 M7 C0 k$ d; ?
  [
  s7 _* _& o4 [$ `5 I1 p    user-message (word "There are too many cars for the amount of "
8 X; Y, L: P3 t" k; C2 t  P( t                       "road.  Either increase the amount of roads "% D0 x) f$ E# b+ f: W! C3 n
                       "by increasing the GRID-SIZE-X or "
+ n3 P2 e' p2 v                       "GRID-SIZE-Y sliders, or decrease the "
' e% j1 P4 U+ q* t' A6 o                       "number of cars by lowering the NUMBER slider.\n"$ x7 |1 f8 I" C8 B
                       "The setup has stopped.")
) A) ^3 g3 n1 v! S) F9 R2 D1 j; J    stop' e5 t1 z- r+ r& H; _2 E; q
  ]4 e; g  W8 l1 i' }6 Z9 v( k
2 z! t1 H" H+ x1 R$ b
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
& M0 h% A- S$ R1 e, B2 S  crt num-cars- j: g9 t' ?0 N$ s2 D* L
  [
" V. p8 i, x% _+ R    setup-cars$ s/ [7 u) Q7 Y/ w
    set-car-color+ T5 R( N5 P# i3 h
    record-data) s% f/ O& F3 }) K5 Z$ K6 _5 |
  ]- `! O" [- ?) O1 i5 w$ u; U9 X

: o& l1 e, }* P! _- h7 s  ;; give the turtles an initial speed2 j4 J) ?# ?, Z8 G0 W7 G3 l7 V" U' |
  ask turtles [ set-car-speed ]
# A2 D# m( m( Z) |
3 F4 S3 f( c. n/ p2 v  reset-ticks
1 `! e  S1 v/ W7 z; I' J+ {: Z$ Lend$ a2 ~4 k. z  T; _! B/ a3 A

; ~3 U3 r  E! _! a;; Initialize the global variables to appropriate values
" u$ e- c) L* @$ v3 Uto setup-globals
+ X! N. [% s0 H. ^0 \' ]  set current-light nobody ;; just for now, since there are no lights yet
1 j% \! n) s* e* ~: I  set phase 05 R8 ]/ y# s9 H1 j% ~
  set num-cars-stopped 0% V# k2 f7 A) P# w
  set grid-x-inc world-width / grid-size-x8 ^5 H/ N+ ]2 Y
  set grid-y-inc world-height / grid-size-y
- {. c. _+ b5 N# ^- }8 w- V  l
! g5 B$ f' S0 v. {6 G% ]  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
; A' u1 |6 B' K8 v- E7 B  set acceleration 0.0995 m8 Q# ]1 o, o) Y$ U# w6 m
end
: G* ^$ g6 Y8 n- p- A; N
" J: F# B$ L% o# v0 p6 ^" k;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
; F2 q4 n! N( N4 Z! [) Z;; and initialize the traffic lights to one setting
: v7 q& L6 k( Bto setup-patches; t3 {- e6 C/ c
  ;; initialize the patch-owned variables and color the patches to a base-color% |* ?+ i1 M3 i# Q6 u& O4 E4 ?6 m
  ask patches
$ ^1 B% o5 E, u/ o5 C7 |. v0 T  [& f/ s; b$ r; g9 }+ j# Q' p3 ^1 \
    set intersection? false( Z1 x# v- u; R5 b, Q0 c
    set auto? false  a6 {% i4 f& p3 o, e
    set green-light-up? true) U; ^( T) D, X  F( f& c# I) p) X
    set my-row -1
6 O* h  ^! T& O9 A" U9 I& A+ l    set my-column -1
9 g! M0 g: F1 a: f: d0 K% |  [& u    set my-phase -1
# U7 Z- q, x( m( F    set pcolor brown + 3/ }/ U/ o5 x' d7 A
  ]
3 K; T  E; {+ [; ^
+ L8 e5 w" P4 c. y5 [7 L7 J8 J" y  ;; initialize the global variables that hold patch agentsets
0 h4 H! @# h5 p. M  set roads patches with. R4 F; K' t6 X) m2 Y% i* Q  z# V
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or  J' x# z$ L$ X9 p; [
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
! Y- Y" k; Y4 I  set intersections roads with( M+ r& ?8 ]9 T* i5 _/ l
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and5 @! \$ e) K' b- T8 e5 J6 R
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
) D/ w  M& H+ p8 e' ]7 n# L+ Z8 o
, d' `% J0 G1 K$ |  [, W9 h  ask roads [ set pcolor white ]
% d. C+ ]9 y& z) j3 [    setup-intersections
$ h. k( X( o/ ?9 \end
! U8 e+ Y1 a  t" F7 r* K' r其中定义道路的句子,如下所示,是什么意思啊?- R( L; F1 N( M8 p! g* r# {
set roads patches with
$ v9 d& q9 t8 i% i4 v) P    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or' t8 o/ D  a$ m/ _$ B) q
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 f' t* X# f: v. q0 u- S
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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