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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。
2 j5 `1 ~% n( gnetlogo自带的social science--traffic grid这一例子当中,
2 H0 L0 p& _8 W3 h# [6 lglobals
- F$ R* \9 x. |$ u[8 K+ q  s# i& }& m. X6 U) J
  grid-x-inc               ;; the amount of patches in between two roads in the x direction" t. t0 D" X" s" n6 y9 h. S
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
" t' \: Z# B3 y8 I  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
+ X2 R+ c$ b; S  k5 @, U                           ;; it is to accelerate or decelerate* S7 q( H9 L5 J; G, z' P1 _: ?
  phase                    ;; keeps track of the phase
8 E7 ^1 W% R9 r4 W5 Y# ^; M& [  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure( N" W7 V6 [! V% l0 i0 i
  current-light            ;; the currently selected light5 m! P/ t9 X. k5 _: S

9 ?! ~* q9 u0 q& e- M4 }" d  ;; patch agentsets$ M( Z2 n# h) ]
  intersections ;; agentset containing the patches that are intersections7 G0 R: l7 ~: N( f9 |2 J" l: |
  roads         ;; agentset containing the patches that are roads
# ~/ U+ ]" o8 p; n]
# T. ~3 W' C3 M; a* m8 V- j
% H8 \5 x) q9 m, Bturtles-own0 L5 E+ x4 N( Q0 ?( `3 B, ^9 H
[
# A$ F, [# R9 Z0 w  speed     ;; the speed of the turtle7 U8 ]4 ~9 I; O; Z/ W* x. E/ z$ M
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
5 i3 c" {. F: j! M  wait-time ;; the amount of time since the last time a turtle has moved
/ Y- J) M$ W: {- w]
( ^  D, ?" l$ a, x* A" n+ r
5 `1 }2 P0 Q& a! ]9 _, Ipatches-own4 g, S6 e0 s1 S( J8 q( S# k
[7 w( Y. o. ?% I' V$ |9 w8 Z
  intersection?   ;; true if the patch is at the intersection of two roads6 Y$ k) A$ V; c: I( T; B7 G# {# j
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.+ T# \2 s  Y$ F. Y/ P3 d
                  ;; false for a non-intersection patches.
4 e4 ^/ Z# ^! {- }  my-row          ;; the row of the intersection counting from the upper left corner of the
7 ^, l% i- L+ O/ p! G+ E& C                  ;; world.  -1 for non-intersection patches.: L* G: e% U! G6 f
  my-column       ;; the column of the intersection counting from the upper left corner of the
& K( X$ j7 H+ @5 G5 p                  ;; world.  -1 for non-intersection patches.
5 Y6 z+ }! o% D% g; f& M. C7 W  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches., g* ?! h- }2 r* G
  auto?           ;; whether or not this intersection will switch automatically.' _! n' S$ {7 c# \, h
                  ;; false for non-intersection patches.
  n% y# w' r$ S' g]
* t" j& f8 r, O+ }
7 }7 {: B! _& u. B3 z5 a" v6 m* |) J, M: I' f) ]% e4 d+ _
;;;;;;;;;;;;;;;;;;;;;;1 c! A! J, `7 N$ q" Y
;; Setup Procedures ;;+ c7 f2 F: N" }7 k1 o
;;;;;;;;;;;;;;;;;;;;;;. M1 i5 S6 k) w9 ]0 U2 y

" d9 {% ]2 Y/ ?  X+ V;; Initialize the display by giving the global and patch variables initial values.
5 ]" h- T$ G/ p1 T$ l, R;; Create num-cars of turtles if there are enough road patches for one turtle to! S6 @  [. s5 D  T+ B
;; be created per road patch. Set up the plots.( i% F2 e' I3 ^) Y
to setup# h2 U0 f1 Q, O2 Q
  ca
5 B- E5 ]4 p: U( m/ q  setup-globals
& F4 J7 C# W/ h, c* D* @4 T
( t" `9 ?  S( ]- B4 r# j0 P  ;; First we ask the patches to draw themselves and set up a few variables
) c* u* H+ j9 r/ s6 N" ], a$ ?  setup-patches
" \; \1 o5 C1 W/ m  make-current one-of intersections
4 B% G$ {- |4 ^' s' i) }+ l  label-current5 z( d5 d* k' V  s6 E

% L, [7 \3 M" B0 K. ^2 O# Z' c, N: U  set-default-shape turtles "car"
& w% ~% A0 c7 A. ?9 @% H1 f8 }* h2 X- i
  if (num-cars > count roads)( y' p, H! B1 M4 [4 k
  [
9 x( E" r3 Q& _9 @7 Q9 `    user-message (word "There are too many cars for the amount of "7 \7 p6 y" v6 ~) @1 f
                       "road.  Either increase the amount of roads "9 ~9 C- T/ B' `3 [" G
                       "by increasing the GRID-SIZE-X or "3 i2 Y; D; F9 M8 q
                       "GRID-SIZE-Y sliders, or decrease the "8 u& p- J# P  o) K
                       "number of cars by lowering the NUMBER slider.\n") O9 ^8 N! X- r6 g
                       "The setup has stopped.")& [! R* c* _2 i- Q% h7 q' ]! D
    stop
0 f* a) L+ s' O7 N$ ~  ]
2 f: O; V. M# c2 i" V, |* w5 M# ^+ @) I: p- n
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
6 C3 v! |; c0 n! m5 V, a3 j  crt num-cars
0 ]# C+ p' ~" ?+ V% t" n" Q" x  [
' m; C# M' C+ T3 q; l; q    setup-cars6 z3 C1 s6 M( l$ G6 _
    set-car-color; A# K+ \5 `) x
    record-data& b/ o! p  ^+ E  ~# k+ }" n
  ]
$ v: W6 C! I7 s$ v. z
1 T% a- p7 g. D; o  ;; give the turtles an initial speed
% l8 l4 j0 H* ]2 Q  ask turtles [ set-car-speed ]
7 h4 i( ?* x7 E  F' f% l. |: ]1 ]1 {
& n* Z, H, K# r( u' W+ r% Y+ j  reset-ticks: q/ B) M/ d+ l; d( ]( H4 ?0 K
end
# c: w, D) `0 b% U  B
4 V, l$ t3 X$ n# F; a$ `" i;; Initialize the global variables to appropriate values
  G' `' e  k% w4 ~) {to setup-globals7 f# _. Z6 {  l4 m4 K* n' F
  set current-light nobody ;; just for now, since there are no lights yet" Q6 E- ]. n- }' o, N
  set phase 0) w1 O) l. V+ J9 D$ m, o
  set num-cars-stopped 0% P; E  W7 P# e- i
  set grid-x-inc world-width / grid-size-x; t) ^9 E) \7 S9 H% p( x
  set grid-y-inc world-height / grid-size-y( E- }" S) c4 m1 N  B

1 }' K* B) ~6 C  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
! V" M( U- H, l$ s' r. c  set acceleration 0.099
4 _& Q: J0 I8 P9 O0 Iend9 Q9 v/ G6 O' C7 r* y
, o# |/ U* G: }- T7 Y6 R5 V+ H
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
' b9 }0 \+ o& M% u. r& ^7 v;; and initialize the traffic lights to one setting9 r0 K8 v, I$ i3 X' g1 P+ m
to setup-patches) D% f0 M' W! i1 G+ ?9 H+ U! Y  h
  ;; initialize the patch-owned variables and color the patches to a base-color8 V" f1 G2 k: d$ o, x0 g
  ask patches
* E3 ^  e& L$ w  [
3 M: w" c* \% W- Z$ z# J  K; V    set intersection? false, S" Q5 c$ b1 v2 A% [) n) f' m# f9 [' c
    set auto? false
/ V/ H. v2 L3 B    set green-light-up? true3 s6 L1 @# @6 Z
    set my-row -1
# d4 G' P8 X2 O4 N+ J7 J( h    set my-column -1
' K5 i  N' I$ p! o" M1 Z. h1 G' h    set my-phase -17 K6 S: W: S: A/ j5 Y$ K+ p
    set pcolor brown + 3* \% Y; v$ Q7 s9 I
  ]' ~) p- k  P; D- r+ ~: }  o  ]8 {

4 h7 u1 j8 `. t- ?4 v! r  ;; initialize the global variables that hold patch agentsets$ M, U6 w9 h9 ^  x) F# k
  set roads patches with
' `1 y' }! R8 o    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or9 q. O' q( Q! V1 ?" L
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
5 q$ X, [/ s% S  set intersections roads with
; t' g6 k; |) J& L0 Q; `    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
" l9 S8 ?, X/ ~: M  W3 z: I    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]+ Z* u/ L2 N4 z: f; n5 C+ _

! x1 q, U; Y: |  ask roads [ set pcolor white ]/ k: x( ]! u8 E" n* d! [2 H
    setup-intersections6 {5 R1 @: V1 R; E5 V
end
6 C6 w8 O! `- L4 f/ i2 d0 n$ h% U& G其中定义道路的句子,如下所示,是什么意思啊?
# v) f' ]) i$ K" I+ u9 c set roads patches with. ?7 u* @) o5 _) `- p% N
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
& s9 a0 x, W) C; v- N    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]- r4 ~! U/ c' m$ U* V; N6 D
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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