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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。
/ [+ k. z! V6 ]* J3 d* znetlogo自带的social science--traffic grid这一例子当中,! m% e6 [! x8 R$ c8 @, O* Z
globals
* H7 s! @. p  U[
/ L  ?$ H1 w5 U- h  grid-x-inc               ;; the amount of patches in between two roads in the x direction
" {8 G2 r; S+ H) b: k, A  grid-y-inc               ;; the amount of patches in between two roads in the y direction6 W+ H4 L% `4 e8 G! [, ^9 |8 |/ A
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if" c, o) Q0 K: }0 M( A8 f
                           ;; it is to accelerate or decelerate
, f6 H. \; C+ h$ Y' r+ D$ C  phase                    ;; keeps track of the phase' U- X* n% s! a+ i* }4 t8 O
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure. X) x, ~6 a. U& U; n: {) ^& K! o
  current-light            ;; the currently selected light
' e4 Y% K0 P) c) s( E, p7 L6 N) S" w  A9 ^# e. W5 a3 L
  ;; patch agentsets9 t0 d% G, k4 t; i/ q2 s
  intersections ;; agentset containing the patches that are intersections" ~9 W3 i0 r  p( C3 d* O
  roads         ;; agentset containing the patches that are roads. r0 L2 k/ V. m1 f5 {
]
" W9 m. D2 R# p9 M# V5 d5 S" _$ V$ _- |7 L6 g
turtles-own. l. i& h9 Q; J  b0 R! L
[
1 I. P4 t6 s0 r1 x; K& G2 W  speed     ;; the speed of the turtle
, K! r0 u+ L6 l$ n" s  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
( g5 a' X6 v$ w/ y# V: y) I  wait-time ;; the amount of time since the last time a turtle has moved
% F( E' o6 |3 K- Q7 ^5 g]
9 _: B& ]* o0 s1 k6 G+ y6 J' j- x9 @# z
patches-own
; v: V) N2 ]% X* o* c: K[
6 ?9 d; S: O/ T1 @  intersection?   ;; true if the patch is at the intersection of two roads( ~! I  d- x7 [  C/ A
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
/ f  O. b& [$ V9 t( X                  ;; false for a non-intersection patches.) e0 t( [  D0 N( I0 G3 ?2 M5 ]( T# `& r
  my-row          ;; the row of the intersection counting from the upper left corner of the% ]3 g7 ^8 d! H$ E  T
                  ;; world.  -1 for non-intersection patches.
+ b* i1 Q# f. H; l/ U8 F+ z1 v  g  my-column       ;; the column of the intersection counting from the upper left corner of the
+ S6 g( T" J1 Y/ C                  ;; world.  -1 for non-intersection patches.
" _/ j) m2 c$ O. \9 v6 h- `2 z  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
. w0 c* L( f2 o  V8 I$ [  auto?           ;; whether or not this intersection will switch automatically.
6 o4 a8 R7 f6 C' ~" U9 u, h                  ;; false for non-intersection patches.
8 A; q" t) Z; ~. \( O]5 U6 \! f0 h. {" x6 o" N5 C

4 A! g) W6 L5 p/ I
( g( {" g0 ~; M; o8 R+ |;;;;;;;;;;;;;;;;;;;;;;" ^. `* V6 }% l0 W; S  ~
;; Setup Procedures ;;) s! ^% y8 a/ m, S
;;;;;;;;;;;;;;;;;;;;;;( g- ^$ @- `* Z& ^' {+ D0 c+ U9 S
2 Q  {3 L9 r5 f
;; Initialize the display by giving the global and patch variables initial values.
& V) i( i' w, E1 V7 R' R2 b;; Create num-cars of turtles if there are enough road patches for one turtle to
5 N; _" p0 ?' B( i' L;; be created per road patch. Set up the plots.
( R5 p5 R) D0 T( `- V' r8 ]; sto setup  d& E$ }2 \9 P  x% i
  ca
3 p6 d( z3 o& c  \  setup-globals
6 |' y4 x% [) K5 t0 S) s8 I7 n8 ?! O* \3 H: s. q$ k( P1 y
  ;; First we ask the patches to draw themselves and set up a few variables8 M7 i( H& w: K* B# ?* C
  setup-patches& f6 y6 n/ @2 Z& `
  make-current one-of intersections
/ \: A- `; z3 p: @  label-current
/ G1 c& }4 `  r
6 o( w% ~3 G4 d7 T  set-default-shape turtles "car"
9 \. }4 P$ s" m6 l5 ]! ]" i. x- Y! z5 R4 z  S1 B" j, q
  if (num-cars > count roads)! J9 q& ~: y' S% w
  [
* D6 g6 Q( Z& m2 E    user-message (word "There are too many cars for the amount of "
( o/ m5 R* e5 h+ a( N                       "road.  Either increase the amount of roads "/ N+ n( W/ \9 X! l2 L: F+ H
                       "by increasing the GRID-SIZE-X or "2 e) p. d2 w% k8 _1 [/ I; j: z
                       "GRID-SIZE-Y sliders, or decrease the "
$ a+ [4 ~) a( J9 E7 o                       "number of cars by lowering the NUMBER slider.\n"; g8 p, i; s( @; ]9 @
                       "The setup has stopped.")
3 j: E! C* R( Z# ~* a    stop
4 K. ]) K, y% Z! @: I" e  ]
" g% B& ]# D# P3 D
- _  y4 E% `: I  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
8 T/ f# z+ G0 K' {) @  crt num-cars
/ o2 @$ S: k0 _% `4 O0 M5 m2 n  [
' E7 s0 T+ d; p- p3 n8 G9 T. p    setup-cars: Z! B7 `* L8 S: s
    set-car-color0 |2 q8 h4 ]+ c
    record-data3 ]& i0 c# ?* p8 O- }) |# T4 e
  ]) g" u5 U: f  ^
% Q  S) H% L2 W& i2 \; @
  ;; give the turtles an initial speed
7 T; c, d: {. i  ask turtles [ set-car-speed ]
/ L; s/ }4 N. q/ J
- ]+ G1 |& E! ?* S0 [) Y  reset-ticks
0 C. Z( a; l6 _2 R7 {end! l1 _" R0 \0 Q; H# [1 {+ _) [' O3 n# ?$ t

1 G& Q% y0 }9 T( D( ?;; Initialize the global variables to appropriate values
& c- p5 _/ a5 X" H8 n1 Nto setup-globals) `& W* F. _+ o* L0 T
  set current-light nobody ;; just for now, since there are no lights yet2 C- A3 l. R' T2 z# i3 G1 D/ n6 X
  set phase 0+ i* i2 g0 c% s) H& P
  set num-cars-stopped 0  }1 Y& F' Q- E
  set grid-x-inc world-width / grid-size-x
& Z( G- c5 f: Q  set grid-y-inc world-height / grid-size-y; A: p8 c5 ?- \3 x3 M

( p5 a/ m  ]& G: M7 ~2 f8 x9 s2 T  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
- y$ N  ~; B2 J. Z( l3 @  set acceleration 0.099% M& Q9 k7 I  Q7 m4 D% `
end
, h& I; S) T  C# u6 J1 H" @6 @' D# G" r" f
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
9 {9 f0 x4 g& k4 ~9 x2 ^) G; e;; and initialize the traffic lights to one setting( e! ?; x) k% I( v/ K* h% V! r
to setup-patches! P' N, C9 d- R5 D" a1 P
  ;; initialize the patch-owned variables and color the patches to a base-color
) q; B# ~7 p( H6 T3 \! V0 b  ask patches
  C- q2 _$ F4 Y+ x/ X: n  [
/ T+ T0 R4 L% S3 n. s; m2 ]    set intersection? false
) K, x4 a: w9 D4 V$ K  j    set auto? false( G/ X$ v# `$ M0 q3 a* J
    set green-light-up? true  f4 F$ |) h1 u6 s  j# _
    set my-row -1
2 ?0 Y7 k6 a% ^" n  ^8 d- g- C    set my-column -1
' s( [/ D: w/ r! X0 K: F+ T    set my-phase -1
+ ^' ]" ?3 J; R7 g4 o3 ]    set pcolor brown + 3
( I. a2 b+ C0 h' H" M- R  ]5 b) c& L, E- l' b( y% K; J! F

, n. i' S" X4 x# B- v8 H  ;; initialize the global variables that hold patch agentsets3 H( \2 ?% k+ ?  y
  set roads patches with
5 {. F; B9 w* e5 M. v  p    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
9 B! j5 _1 {  p7 x6 t2 k6 B1 M    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]9 Y. y  R% p! C2 s/ ^# N
  set intersections roads with
2 }% k1 @& c+ u1 c7 L, u3 o    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
( N5 A  a0 M, p1 N# p  ^    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
( O' k) m6 [' ^( `
3 X; F; C  L' q4 P  ask roads [ set pcolor white ]1 v4 v3 I# i' h9 S- n  W, I6 y
    setup-intersections5 A( K" Q5 h3 Y
end
( w: \. W$ t  c5 G  {- L其中定义道路的句子,如下所示,是什么意思啊?
0 p) C5 E5 p) a! L! v1 {" A set roads patches with
4 K5 V4 e) Y6 l. @    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
& v; I! k( ^. Y    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
+ z/ e! P' H. N" H7 h0 L& y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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