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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。
1 H+ Z2 H% y% q' _" o! `* a$ {netlogo自带的social science--traffic grid这一例子当中,
) [) L, p; i4 a% h1 w% l+ A4 Sglobals7 u# k7 @# v7 G1 V3 B# t
[
( a% K1 b1 G, j) |" d/ j2 F& g% X3 O  grid-x-inc               ;; the amount of patches in between two roads in the x direction, W1 H" @9 ~/ G
  grid-y-inc               ;; the amount of patches in between two roads in the y direction5 N4 M9 M+ _) a# V
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if4 m! ^( f/ O6 l6 F$ W  D
                           ;; it is to accelerate or decelerate
% i1 {' E" S8 w/ q3 z# @6 |0 r0 Y  phase                    ;; keeps track of the phase
' ~" }8 k. h  U. X3 h. [/ N" C6 q  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure$ d0 M0 u* l' h- L5 f
  current-light            ;; the currently selected light6 k2 H! q8 M+ e! g. ^
; F# C) ]  c+ U1 U2 E8 z
  ;; patch agentsets/ R0 ]0 N7 f8 S. [% u* q- P( R
  intersections ;; agentset containing the patches that are intersections2 V5 z) n. w2 \) Q7 v
  roads         ;; agentset containing the patches that are roads1 |/ u; X: Y! I" n
]% |, U4 W& p' E9 Y0 ~
) F9 L6 x3 u& R/ L
turtles-own
* D4 w. x  H+ p/ H1 q) V[0 e8 u, Z' |2 ^9 }% H
  speed     ;; the speed of the turtle, i! p+ k0 y& ^% ~: t0 ]. L! [
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
) L9 i% a" G" h, f4 Q. {  wait-time ;; the amount of time since the last time a turtle has moved
5 R, S- o4 E- I- g( D1 g]
( ], {- c8 }' U9 p# ^. A" H9 v" u4 u8 s$ n
patches-own
" a. G! f' ^$ @( k6 M1 `. V9 ]5 w[4 ?. |. T+ Q. e4 i: d. Z
  intersection?   ;; true if the patch is at the intersection of two roads- X! O9 l/ G; r- h
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
$ |( {2 t" s  s( n+ ?: k6 ~% m5 k                  ;; false for a non-intersection patches.0 H9 S- C- d2 j
  my-row          ;; the row of the intersection counting from the upper left corner of the: h4 Q. G- g( u8 g' a( h
                  ;; world.  -1 for non-intersection patches.- x: K- l" t/ l# E6 }
  my-column       ;; the column of the intersection counting from the upper left corner of the3 l/ Z& I  L: e; O7 q
                  ;; world.  -1 for non-intersection patches.3 q) m0 y$ P( ?8 r
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
5 K8 y9 c8 `: N' f5 f5 o% z( j  auto?           ;; whether or not this intersection will switch automatically.
6 ]( g( c( T7 o! ^' o. q4 B                  ;; false for non-intersection patches.
" c* Z' H) S& f]* ^4 t' x) J4 r/ V) v( J
/ q6 P  Z& L1 p" m/ a

4 W" J0 r/ g) C$ O. w3 K;;;;;;;;;;;;;;;;;;;;;;6 r$ ~( t1 D' Z' h
;; Setup Procedures ;;+ H$ Y( i) U* A/ {7 T" A0 Y
;;;;;;;;;;;;;;;;;;;;;;# N5 M! |$ Q, L+ x

6 Z+ h; \7 ?0 d, G; N;; Initialize the display by giving the global and patch variables initial values.
6 p* O6 E2 a# U0 [$ [) j;; Create num-cars of turtles if there are enough road patches for one turtle to
3 H' v' m1 D9 q/ F;; be created per road patch. Set up the plots.' K6 M! l+ P5 Z
to setup: W: d% o# @  w" E9 U  c
  ca! H! D" M3 p7 V1 T: K4 W
  setup-globals5 Y# {4 \6 o( X* x- l, F* j1 k+ ]
3 t* M' u/ M5 {! o) P9 f7 L! r9 _  d
  ;; First we ask the patches to draw themselves and set up a few variables# ]4 V+ P8 B+ H: \. _
  setup-patches+ t8 N# e- }) H8 G7 Z; F
  make-current one-of intersections' I) r6 Z/ l% y# K! C, e7 q
  label-current* l8 T  W8 p& @; {  d- g9 K8 _' |
. G: r# L0 }. l# }. R5 b
  set-default-shape turtles "car"
* W& X+ D; E0 j# `" o/ H
8 Z9 z1 x+ @  l0 g) B6 F0 Y1 @  d  if (num-cars > count roads)
& H3 l9 n3 ]6 E- H# w  [2 t, P. L1 c9 g! O: u" z
    user-message (word "There are too many cars for the amount of "# D% ?+ |; L& v/ p' m& q. g$ u
                       "road.  Either increase the amount of roads "
2 |5 @! V3 b: Z: k9 F3 b                       "by increasing the GRID-SIZE-X or "
" D, H7 [) s0 `  |                       "GRID-SIZE-Y sliders, or decrease the "
2 M, F% k% l7 k3 ~$ ^5 j                       "number of cars by lowering the NUMBER slider.\n"0 f1 @" q( h. |, ~0 E
                       "The setup has stopped.")
2 X! E. q' R& ^, Z! {    stop9 N0 q4 a6 i" i1 C) [2 e# c# P
  ]
  j2 u* T  d+ T( I# r) O7 R
9 E& Y: {0 l# k9 u; M" [  |( F  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
/ c. t! l2 V  m  crt num-cars
& @, \! f" H# C5 ]2 p  [
6 T' |0 @9 M5 W, j3 W' |2 O/ \+ G* H    setup-cars0 l( D4 g$ h* ~, M3 ]6 V
    set-car-color
; X* W' ]6 e, ~, I9 p8 I: Q* v    record-data/ D( T5 x, p4 F" z, J
  ]
" c) ~& E% c1 o9 P1 @9 @( H4 b: q& m  F- i% v" i9 ^
  ;; give the turtles an initial speed
2 U. b( f8 n. {( A  ask turtles [ set-car-speed ]
% x5 L0 a/ A3 d
" W2 B2 ^: H7 T9 a; v/ A  reset-ticks% k1 m1 k, t2 S6 F* o% r! m7 G( S
end) J4 K+ v- L* [' a. N1 w. w
' H) @; z- A% L6 G# x% I+ r
;; Initialize the global variables to appropriate values& b3 n2 V1 [" ]% u
to setup-globals
" a8 B; P8 h9 K7 l  set current-light nobody ;; just for now, since there are no lights yet
, ~; m! h, `% S  V, T  set phase 0
! z3 l# A" P1 A& t  set num-cars-stopped 0
1 }0 C. _0 B9 s% ]! A! g  set grid-x-inc world-width / grid-size-x
1 d; R) f! c/ n: z/ a* d% {% b  set grid-y-inc world-height / grid-size-y
( g, P3 G6 a+ N, v0 \) X
$ e6 W; \9 E) @0 a* X  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
4 ~5 n7 z; T/ \  set acceleration 0.099" ^& Z! s; A0 U" F
end: T! y  }; W; I# o/ H& e* b. l2 l: t
! ?6 W7 o& \1 n7 x: Y) m) D
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,; c1 d5 M. }  s, H0 T* s! v2 u
;; and initialize the traffic lights to one setting
/ ]  c9 x/ R9 u5 \  Lto setup-patches( i+ q3 M- `1 z6 l8 _
  ;; initialize the patch-owned variables and color the patches to a base-color; \) Z; B8 \& }( |
  ask patches
- x( b$ T$ C1 S1 b  }  [
" |/ u4 s  ]3 w2 }) d! d    set intersection? false/ E: D7 w: v  C: r0 e5 U# B& F
    set auto? false+ ~6 }3 y  V3 _; g
    set green-light-up? true* t  X: g+ C7 o$ ^% g5 t7 d
    set my-row -1
4 p0 R' ~, D7 ~    set my-column -18 p: J. P, j! W  M8 p
    set my-phase -1, U7 F7 p  t- q9 g& i+ ]6 U
    set pcolor brown + 34 p4 N9 _" m* E6 d$ R
  ]
" F: r& X8 S: |, g8 M: d5 X  {
; {5 Z# m# f& b9 ~, i# Z  ;; initialize the global variables that hold patch agentsets3 Y5 G( Q$ Y; ^3 j+ V( X; _
  set roads patches with
5 h6 l" G/ b0 p2 o    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
+ n" `+ r1 x+ U/ C+ b    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]$ m/ I- a( h4 S& _& f1 @9 A
  set intersections roads with( i6 h0 N) S* T4 f, d2 F
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and0 Q( M9 `0 M, z/ n( x
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]  W& [( H. c* d9 T. W, ^

6 x% T+ C$ i7 L  ask roads [ set pcolor white ]# j" e9 ~5 ^; @0 J  n4 ]) M. B
    setup-intersections
( i: ]0 y2 I( R* W0 Q, Z( U2 `end
) Z# d! [! |: O7 @其中定义道路的句子,如下所示,是什么意思啊?) [/ q: F0 K) F$ Q* ^
set roads patches with" a- c, `- h. G2 i' l
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or  b1 _! d$ [4 p- I& `* Q* U
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
% \$ J5 M# V! @' k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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