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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。
4 C6 U% m! P( I# u5 Onetlogo自带的social science--traffic grid这一例子当中,8 F% o- I! J  z- X( J
globals
1 L* k* Z( y) |) S0 ?# g[4 f- h' `0 w) }$ h. l
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
6 n$ t5 w9 P$ ^# @7 y5 {5 s& K4 ^/ H  grid-y-inc               ;; the amount of patches in between two roads in the y direction0 v/ q9 w6 p: V2 n$ T) t
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if' s5 {& f! H5 B) k% `
                           ;; it is to accelerate or decelerate7 O  |- u8 z2 j$ S8 N% R
  phase                    ;; keeps track of the phase" W( J3 P. e' o5 V' i9 j) o
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure8 K/ U+ ~* |& ]* |/ x
  current-light            ;; the currently selected light
4 \! {$ E8 s$ x4 v: O2 \5 e6 r5 G5 i8 j# ]1 N* Z. H
  ;; patch agentsets7 c& ]( \, W, z/ S; o
  intersections ;; agentset containing the patches that are intersections
5 W. w; S( ^) b: L' G  roads         ;; agentset containing the patches that are roads
. {9 M0 G' y( []3 F* V2 _* R  c# N5 T  d& g

; D9 r9 I8 X& Z" Cturtles-own
, Q  K8 L# z+ L6 }# m[
) l' o5 B8 l# h% N( l9 t  speed     ;; the speed of the turtle' L; p- R2 ]3 K7 ?: f1 n$ N5 D
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
8 ^" \" x$ l5 U3 U  wait-time ;; the amount of time since the last time a turtle has moved
+ y, U% W5 M+ {  K* }/ T]
! e0 W3 V2 h" `) }! w) ^, }$ n" Q  n9 v
% }# b0 B7 l5 q; n0 S+ K6 ~. cpatches-own3 W3 B( J, R! F) y
[
, E, I2 ^5 X% `* \: @* g3 e  intersection?   ;; true if the patch is at the intersection of two roads
* p, ?: e2 T9 i+ `7 B  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
9 _1 o  l0 j! W5 @9 W# d                  ;; false for a non-intersection patches.1 w, z( R7 h2 Q( Q: v& C* g, \
  my-row          ;; the row of the intersection counting from the upper left corner of the
% O5 c8 v/ O6 r" r! \  J* }0 k                  ;; world.  -1 for non-intersection patches.
9 t& m( Q9 {$ M1 J# ]  W  my-column       ;; the column of the intersection counting from the upper left corner of the- u, F9 E4 _8 w3 _5 H0 I1 j( l' `9 l
                  ;; world.  -1 for non-intersection patches.6 v" w1 N" A( @: z" P
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.  U! ?$ h, Z$ I6 g3 P0 q* ]! K, t7 t
  auto?           ;; whether or not this intersection will switch automatically.
6 a/ T9 p- t) ]+ q5 S                  ;; false for non-intersection patches.
- \% m8 l9 X; j$ i- [" z]
1 k  m+ s' G, I  n* j; M" p0 K3 w6 L/ p' Q
9 b0 K- u. p$ P
;;;;;;;;;;;;;;;;;;;;;;
3 B- |* h5 N5 V3 m9 X, o7 R5 z;; Setup Procedures ;;8 N; J: s$ B0 L% I7 P
;;;;;;;;;;;;;;;;;;;;;;
5 Z' P0 R" L, ^
: I$ Q+ |3 e" B8 f  r;; Initialize the display by giving the global and patch variables initial values.7 u% v9 W# v9 I8 b0 M. {) I% L3 }
;; Create num-cars of turtles if there are enough road patches for one turtle to
, ^" i" j0 o* L  t;; be created per road patch. Set up the plots.) Y4 c  o+ x: |
to setup
4 w% B$ x, E/ l: A: S- P  ca
" t- u; \. W( J  h. |  setup-globals
  D3 {7 _. I6 H0 n* g0 }% M- A# K0 b/ W% J$ b4 d: P: Q" f
  ;; First we ask the patches to draw themselves and set up a few variables7 M: q8 p0 b+ Z1 D/ D2 k3 B
  setup-patches
; e- ?7 |  U3 X# j, |9 K  make-current one-of intersections5 Y4 U/ m; r! B4 z, r6 `; L/ ^1 \
  label-current, _5 H/ a$ C3 s: o

6 D+ Z* V. g8 M3 o. \$ f) ~/ ?  set-default-shape turtles "car"3 s; [9 D8 Z4 G# r0 \3 u) y  b

+ S* |% r, x% C+ R% q3 Z) m  if (num-cars > count roads)
+ a: l" x, I! ?3 \7 \0 ~  [
- F9 M2 L% S& n9 C8 ~8 C- R+ }0 Q    user-message (word "There are too many cars for the amount of "
( n* U+ T' m) L: {( F6 {                       "road.  Either increase the amount of roads "2 F& H% o* T7 H& p3 {" e- A
                       "by increasing the GRID-SIZE-X or "
5 o* s2 i+ y1 O7 s2 `                       "GRID-SIZE-Y sliders, or decrease the "
# k. C' x0 j* n8 o8 G$ U                       "number of cars by lowering the NUMBER slider.\n"
) a( i  P1 R/ u1 y6 s# s                       "The setup has stopped.")4 z% q# m1 B$ _: m' l2 k/ J7 ]
    stop$ {4 \" ?: U- D- I5 C2 j) m: @" B$ k
  ]* C: C" T7 [5 p1 Z

- B" y3 V0 u  \3 N  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color+ {% x2 W. U% A* Q0 H+ ~  B
  crt num-cars
  }4 F6 `. s4 Q4 ]" {  [
1 E5 h! h! s' q% c- d    setup-cars; l+ p0 i! r$ A7 e% G" h
    set-car-color
/ V" M0 Z' u) |" T* M$ m# o, C4 h4 u    record-data
2 P$ p! ^- X6 |4 [1 s( ~; w& d- z9 w  ]
+ M1 \) M; v$ b! e6 V
1 [+ \+ I: i0 u- g( S" |, R: F2 c  ;; give the turtles an initial speed
" ^! A! W$ K# `; F  ask turtles [ set-car-speed ]4 Z* E% Z! z2 _+ ]8 I7 c$ h

" B, |" I' L: y+ g0 Y/ v2 v  reset-ticks! M4 n: U$ X5 `$ o4 R7 U
end3 t( \" f8 w7 I4 o. A$ ?6 _8 b. a
+ M) l/ U/ G# Y# w1 p8 Y5 F, Q9 D6 S. c
;; Initialize the global variables to appropriate values
( ~; o% a- G" W5 i7 P& w- q4 pto setup-globals0 y8 d. v6 M7 H! O8 g& N, t/ ?
  set current-light nobody ;; just for now, since there are no lights yet
; E0 p7 Q. c1 D  C* d7 Y5 e  set phase 0( o+ G3 d* o; }) W
  set num-cars-stopped 0
% j4 ?2 V0 W% y* O6 y. Q, E# A  set grid-x-inc world-width / grid-size-x4 j0 m* F& j5 Y" Y& H( v1 T
  set grid-y-inc world-height / grid-size-y
; n3 p2 l, B  P$ a( |6 U) ~( }9 g( y3 x+ H) s. k
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
# c1 w) G, [/ L) l$ G7 W0 ~/ ~  set acceleration 0.099
* d+ C' S8 k/ E2 m  Bend
# {$ X9 T# ^; J# @! d( V9 B8 @) o1 i& X& c' `
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
& _7 t1 y( c. I: @  t2 \;; and initialize the traffic lights to one setting7 S, P3 f- l& e  t" Q. o  X9 @
to setup-patches
; v2 {/ o$ ]+ H  ;; initialize the patch-owned variables and color the patches to a base-color: ]# F, E2 p1 L% ~% R  Q
  ask patches
& K5 `% Z0 E; P  [0 P# ?1 w* S  k* N/ H
    set intersection? false
# o: F* i! L! L2 ^: m    set auto? false4 V3 D  J0 T5 y& u8 O
    set green-light-up? true
1 A  t) n8 I% d0 }    set my-row -1& A3 c' a- R4 G" g
    set my-column -1# o; y9 Q# V4 v) a- f0 m( u
    set my-phase -1- ^0 S! Y) A: S9 U- |
    set pcolor brown + 3  x# ?( \! S% C5 |% A' }
  ]
' u; \4 U; e+ b$ `7 e/ z9 u" Q3 }. |/ ^; [
  ;; initialize the global variables that hold patch agentsets
5 w6 G4 |" O  y  set roads patches with
7 j2 h1 C0 Z# Z+ J# ?( y! Y    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
. \: F# c; ]! [    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]5 A3 |, e. Y( C* v, h6 b/ ~
  set intersections roads with
' [& ~1 a, U" `! j- J7 p    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
% Q6 F6 ?+ I) t) ]+ w" S7 s    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]9 P5 O" {( g3 M& C3 K
) T  H" k2 l- t0 L
  ask roads [ set pcolor white ]5 V9 s  X+ ^# E) y' v& s; m7 U
    setup-intersections( M/ J: K7 \7 Y
end
- }# K+ E/ Z3 f2 C$ z7 n7 z其中定义道路的句子,如下所示,是什么意思啊?
6 X" v6 }) ~5 B% n$ I" n* X# F set roads patches with8 ^4 _( a0 Z. W4 @$ F
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
: H  R" m1 ?& m8 _6 a2 P* T    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
! C5 T8 U" f$ B" j& C0 V% 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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