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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。
: t: p* F. [2 Y% i' Y  X6 vnetlogo自带的social science--traffic grid这一例子当中,3 R5 ^( }9 V) `
globals' e9 M' W: M1 C3 H
[/ B$ g* [- m' B& {2 W# w/ k7 v
  grid-x-inc               ;; the amount of patches in between two roads in the x direction! T% b6 N; {7 G+ x4 W
  grid-y-inc               ;; the amount of patches in between two roads in the y direction/ ]; X1 B! m* n, B
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
, Q1 }8 r/ V- u+ y! j( `                           ;; it is to accelerate or decelerate! k" `8 L7 T/ D% Y6 `2 ~
  phase                    ;; keeps track of the phase
# s( e$ o2 S6 P6 K! w1 q  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure& T1 H) V9 k) c4 G
  current-light            ;; the currently selected light
1 Q6 `( w$ S- n! o7 w+ \; t* G/ O# ^0 P) o% E
  ;; patch agentsets
8 A( o# w* y) _& @  intersections ;; agentset containing the patches that are intersections  a9 C0 H0 O! A0 |) ]
  roads         ;; agentset containing the patches that are roads
8 f, m' k$ ^( [8 V3 S) m1 S  k; F9 e]( i" Y9 c8 Y( Z4 f4 g

6 S- N1 K) u. w3 ^( A" H6 D$ a7 Rturtles-own1 G3 ^, d, f1 ^: X2 b
[
: |" i6 n, E5 g# z  speed     ;; the speed of the turtle
  n/ w% B8 X( i, K" {* x( P  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
' S% Z% o) Q' c/ M7 k  wait-time ;; the amount of time since the last time a turtle has moved
4 C' T8 e9 E' J, _" V]) a" ~, E3 R' }& s

5 W. T, T5 C% i2 X6 n8 gpatches-own: p  M4 z6 m" S1 m! ]1 a
[
* d3 a2 A3 A0 q2 W& a2 Z  intersection?   ;; true if the patch is at the intersection of two roads
1 F3 t2 P! R1 f+ R- h& P- S  \  green-light-up? ;; true if the green light is above the intersection.  otherwise, false." w! U0 g* Q7 r9 [' Y0 j5 y
                  ;; false for a non-intersection patches.# `; p* v& S7 S' a% b
  my-row          ;; the row of the intersection counting from the upper left corner of the, f5 {7 ^/ M" B' V. v0 Y9 c
                  ;; world.  -1 for non-intersection patches.# h" j' r2 v% V' j! o' g4 T
  my-column       ;; the column of the intersection counting from the upper left corner of the
5 t. _! Z6 @8 E8 r                  ;; world.  -1 for non-intersection patches.
( ?3 O! L4 T' [* Q  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
! h/ F. O4 j5 h  auto?           ;; whether or not this intersection will switch automatically.; F- O2 g* s9 D# j3 c
                  ;; false for non-intersection patches.
! r; a' T, e$ h& V]
8 C# f8 ^0 K' g. e! s# k* r- {; F7 L; q8 G4 H4 f8 E6 F

" K! _& h& L: O$ u: W1 M5 f  r;;;;;;;;;;;;;;;;;;;;;;
3 t. [: Z, p$ `$ m& B( S: m;; Setup Procedures ;;
% \: l& B0 h1 J5 E. N) `6 C$ Q;;;;;;;;;;;;;;;;;;;;;;
" j, n* j( p8 \# j0 l7 T
: P3 u3 r# h) U: ^- {% g;; Initialize the display by giving the global and patch variables initial values.
  b5 c/ e6 I& K: q9 _;; Create num-cars of turtles if there are enough road patches for one turtle to4 j9 a- d5 J. M- R7 Y( E5 t
;; be created per road patch. Set up the plots./ x) b) c% o! @# N
to setup
" w4 `9 H' G0 {  ca
* [$ h5 T- S: S+ m4 m6 _  setup-globals" U& G0 E" H6 K9 g
, p8 a" J/ f2 c$ D6 C0 A0 t. `
  ;; First we ask the patches to draw themselves and set up a few variables* c: w/ U7 @4 e8 A+ I/ X
  setup-patches
2 D* U6 J" k" d6 K  make-current one-of intersections5 S5 |. U- S2 {. e7 i. Z
  label-current
3 V: r3 N% \% r5 d9 s) }+ y* S! K8 @# I, M& f7 Z
  set-default-shape turtles "car"- b. W& c$ h: {0 f  U$ b2 z
# W: P" t3 L' s: }. U
  if (num-cars > count roads)6 l1 u' Y9 p: ?2 J3 O& w6 o/ p
  [
3 N$ o& G& ]# i! f    user-message (word "There are too many cars for the amount of "
+ _: c* ]0 c6 a  Q: g                       "road.  Either increase the amount of roads "9 ?: l9 T$ m# Y7 r1 S
                       "by increasing the GRID-SIZE-X or "
6 m5 v4 o6 z  Z% p; Z: V" A/ n# \2 A                       "GRID-SIZE-Y sliders, or decrease the "
. T6 e* l5 M4 O" D+ ^                       "number of cars by lowering the NUMBER slider.\n"
5 i. _8 Q- K: W$ |, ?6 T% l  e                       "The setup has stopped.")
8 T3 B, ?- }0 ^0 P/ d: H    stop
/ m: {- b; u4 ?# }& L  ]5 Q% n) a: R- k" q2 y

( q  m* Z+ p1 P* X  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color* N, E2 V7 b5 B8 k
  crt num-cars0 {# O3 s( Q: D5 i
  [: P8 g- @! {: I5 M. I
    setup-cars
5 {, @' j" a' q5 u    set-car-color
& C  o6 C9 d& |3 H5 D$ t( S    record-data
& a2 [- E$ b# c! T$ F2 ]9 \  ]
$ K7 L' ^- x2 J  R) q( }( A  Y2 O# M
  ;; give the turtles an initial speed- g/ S  ]% j7 u1 b/ o. p  X* b
  ask turtles [ set-car-speed ]
0 ^/ Y8 P& a' {$ q) f1 r  W/ J& U  R- r% u; U3 D6 P( L6 O% F8 m
  reset-ticks* G7 @0 M. f; n, B% I7 Q5 k( r
end
$ a: A, J* T* P! N# \7 {0 k9 ^' J( K. u7 s3 h- U8 ~
;; Initialize the global variables to appropriate values. H- D9 ]" v1 y: C, K1 e8 ~$ n
to setup-globals/ ^* h8 b& ~1 x- r+ H' J# H
  set current-light nobody ;; just for now, since there are no lights yet8 z! g; y# P: t' Y" A8 Y2 e1 Z  S
  set phase 06 |( b# o; Y3 X. A; z
  set num-cars-stopped 0
& X7 |$ t6 V6 e! |9 e  set grid-x-inc world-width / grid-size-x
; e# A# H! x) B) Z4 Y9 m* t. C  set grid-y-inc world-height / grid-size-y: b3 S7 k( t, B' k5 V
/ ~& A* b' t, x3 V8 y: \- n5 l
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
+ `% i  r9 ]6 a# H2 ]  set acceleration 0.099
  }) u4 q. V8 a2 F' l+ w% U$ Oend
: s- X# `, E5 _. F3 w* J/ D* y7 m2 e% |4 W7 J' h2 z
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
& S" _) O" C3 W% U# z;; and initialize the traffic lights to one setting
: J7 s+ T. Q: t1 M6 C+ k# qto setup-patches
1 z$ h3 z) r* p' t! O0 R/ ?  ;; initialize the patch-owned variables and color the patches to a base-color
. A# c1 H! i5 I  ask patches
+ ~1 l# L* \, N% n  [2 q6 D( o7 K# I8 U* z2 w  R
    set intersection? false
  w2 x% F' N, T( H    set auto? false  y, }% _2 F* a  u
    set green-light-up? true
5 u0 M' H2 D1 n' j1 B2 ^    set my-row -1* w3 P  m9 U. a" \' J4 o" i# w
    set my-column -1$ L4 i4 I; X. n/ @* O4 a
    set my-phase -1
) B3 d% r  b. p- m1 Q, @8 l    set pcolor brown + 3
; t, \* q& B( n' y' g7 C1 G- }8 M0 t5 w  ]/ h; N. f. q/ L. c  Q  n

9 f5 ]8 r2 W8 k: c2 X5 [. X8 v  ;; initialize the global variables that hold patch agentsets
9 t; Y# C+ p; M3 m; M4 P  set roads patches with0 I% D5 r! q+ [
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
9 \2 K3 D7 l2 l    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
: [3 ^; _( O9 b( B$ l, U. m  set intersections roads with
& I+ d9 I4 k8 j6 n, c    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and" @1 G: g3 S5 h, }% i
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
. ?4 W" Q( z' Y  V2 @
9 @9 s5 L* N4 }. M  ask roads [ set pcolor white ]
' z+ A+ O" y: z    setup-intersections
: X  l- s/ e7 F3 |3 c" v7 Y1 Kend5 F0 ^% o; r2 H1 K$ d+ z
其中定义道路的句子,如下所示,是什么意思啊?
5 @( E9 @, N2 M/ \; Y set roads patches with8 t" j" Y: Y% E- H/ Z1 ~: |
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or7 y; c& @) W* w: \
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
5 m) ^( f4 ^/ n; \7 ~; d& t2 N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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