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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。* v3 g. ^5 i8 b5 z1 v7 ?4 _! q8 R' L
netlogo自带的social science--traffic grid这一例子当中," r4 b+ u8 ]1 Z0 E' ?/ B
globals: Q4 v2 C( _9 g+ u, T0 i
[  ~. J: }% C! H: d
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
! Y1 d- u& P* I. H5 q! Z% M4 P8 V  grid-y-inc               ;; the amount of patches in between two roads in the y direction) X( o* ~0 |9 O8 J  n
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if" ]/ E2 o3 C* u, ~4 G/ ^0 o5 |
                           ;; it is to accelerate or decelerate
9 w2 j- j# L& k7 g% R  phase                    ;; keeps track of the phase
6 B7 Z+ F, F+ r4 X5 |2 P+ T  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
6 o+ c+ B  R9 C6 I$ m& {& O# i. E1 O/ F  current-light            ;; the currently selected light
8 K5 ]4 }( r# ^
! i& P/ P" e( M7 z+ R  ;; patch agentsets- x8 k- D0 m6 e( Q" P8 q. K
  intersections ;; agentset containing the patches that are intersections* w8 l0 J1 c, l
  roads         ;; agentset containing the patches that are roads0 A* u8 ?( W! b; a2 }: D  h
]
! D/ t7 b2 `0 l( J6 z5 i% u- M$ d' j% h' r- c/ t. k# l
turtles-own
% W. I- V& F9 T2 G[
& `3 U1 u; }1 p4 B; {3 V/ S8 a  speed     ;; the speed of the turtle
& u0 D) c4 ~5 q- n2 f. L  c! I7 i  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
; G. @' H' i" W0 [) `; Y  wait-time ;; the amount of time since the last time a turtle has moved$ g* R% G7 p1 f+ Z- W: Q1 [6 k3 P
]; ?# {, A2 N! e' r" p/ J$ I
6 ^& w# A! a6 U
patches-own% ^% J- ^6 X  c; e
[0 L" Z6 C& F' b1 b) b
  intersection?   ;; true if the patch is at the intersection of two roads5 L/ o  M3 g1 h/ Q. P
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false." |  _0 ]0 [0 }4 c6 K4 P4 U2 q
                  ;; false for a non-intersection patches.0 W& z; d# M, d) S+ C
  my-row          ;; the row of the intersection counting from the upper left corner of the5 X$ M( G7 Z+ h5 \
                  ;; world.  -1 for non-intersection patches.  u# _" I- p3 z1 c/ L) {* C
  my-column       ;; the column of the intersection counting from the upper left corner of the
+ C* \# C3 D& C: k# t3 y                  ;; world.  -1 for non-intersection patches.
* ^2 L# U5 z$ S1 J$ s0 V: ~! P6 y  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
# l+ R2 w0 K3 H' r1 P6 R/ P7 }  auto?           ;; whether or not this intersection will switch automatically.8 }! f; M% u- S" a  {0 V! K& P
                  ;; false for non-intersection patches.
9 b& V" l, p% z. y4 u, F4 Y]: t# H3 ^; U3 {8 _3 _

# x. M7 X; a' ~2 h; }
. I2 C/ \/ V7 }/ h0 P;;;;;;;;;;;;;;;;;;;;;;2 R7 K- N# R' P2 y) z7 C
;; Setup Procedures ;;7 H. a2 I8 X2 \0 [: p7 W
;;;;;;;;;;;;;;;;;;;;;;
3 z7 E: x4 h' }! a" z( g" G& H  |
/ E( S$ g4 S; [9 Z0 F. |* M;; Initialize the display by giving the global and patch variables initial values.
, D7 F1 Q& x* N2 D) ];; Create num-cars of turtles if there are enough road patches for one turtle to) T4 E, h! x) p
;; be created per road patch. Set up the plots.  C% }; ~4 `7 p( N+ s/ U1 B2 f+ f
to setup
, f, z0 g6 e8 C0 Z1 @$ }5 e  ca6 w  g$ I( d9 x  {7 t5 L. K
  setup-globals
- b1 s: \' b$ Z1 J+ d0 H' R" b" g9 ]* X: c3 o% |
  ;; First we ask the patches to draw themselves and set up a few variables  k: _1 m/ x  F! {4 w6 m
  setup-patches4 A6 a& _" Y7 ?: s8 H
  make-current one-of intersections
) c& F) {* E! L1 }/ l  label-current+ L; M6 q& D9 Z6 j- G

; }7 z5 g# b# \/ b: Y. p  P  set-default-shape turtles "car"
0 z( g) ~; y* G/ j% }: ]0 l* `* w$ \; Q. S" @  R, v& A- H
  if (num-cars > count roads)! w1 p9 ?6 Y9 ]* X" Z# H2 ^7 V
  [
2 U0 R8 L% Q/ z. d# D    user-message (word "There are too many cars for the amount of "& W+ B0 _; _& s
                       "road.  Either increase the amount of roads "4 m4 T- k; _  k3 B
                       "by increasing the GRID-SIZE-X or "" \" B5 ~7 M9 C; s
                       "GRID-SIZE-Y sliders, or decrease the "% `  Z% x9 T8 d1 w8 l' H2 G7 X, X& V
                       "number of cars by lowering the NUMBER slider.\n") C5 g0 c3 V1 t* V9 K- j, ^5 J4 h
                       "The setup has stopped.")
  X5 N! }0 }/ Q  T; z1 P  L    stop
+ r9 O: K9 k8 n( ~$ d: O  ]/ H" O% a- G! o

" T+ T) Z7 D3 s1 ]6 A& t  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color+ g) \7 P' @6 n  h6 Z) A6 F' P
  crt num-cars  E' ^( C, a5 o! g1 S
  [
. J5 R9 U, }, {4 k    setup-cars
' g1 f  p' ^3 o    set-car-color8 u8 u$ @5 {2 j, \% `
    record-data
: ]4 g+ Y9 O" E1 m6 s0 U: @1 b  ]" t! F7 f! {- P4 L$ ~
. n0 E. u4 W& c+ Y) m5 [
  ;; give the turtles an initial speed. G, s2 w. F# y8 w8 p
  ask turtles [ set-car-speed ]! x' E# P% g: [3 x  |
5 U5 J( `' r2 f: I( y
  reset-ticks- y- y" V+ ?7 o8 D' D
end
: X* d0 q3 f; [' N; ?6 R5 n" D1 V5 \) c5 |: t- U* F2 R. \
;; Initialize the global variables to appropriate values
/ z& T0 e3 M" h) K" cto setup-globals
& S" {% _( {' |3 W  set current-light nobody ;; just for now, since there are no lights yet
2 m: U% R+ u7 k/ b  set phase 0
2 n& {! r9 v: {- I* @8 ^7 ]  set num-cars-stopped 0
2 Z; A/ F! o& F  set grid-x-inc world-width / grid-size-x
8 S. O) I8 q$ e- H  set grid-y-inc world-height / grid-size-y
' z: `3 M- w4 M4 Z5 F! C9 m3 c
  k  l) B( G6 i7 W0 H  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary9 D7 [0 R$ j; ~6 w5 f- ?. B
  set acceleration 0.099" v8 k- v- A, z3 `* |
end) N* Q  B3 z0 t" y. S

) L9 `; b" h9 ?8 P8 Q0 u;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
+ N& T" [2 i" k  N) W- s;; and initialize the traffic lights to one setting
, J! [' Q1 A: n8 B/ }0 a, T4 Vto setup-patches
2 r6 y$ L/ J$ Z3 b: ^! n  ;; initialize the patch-owned variables and color the patches to a base-color! m( p2 z$ L( q  ^$ D
  ask patches) f* A) O$ Y0 j, X
  [1 T/ `0 M, `6 [- D/ P& N7 A
    set intersection? false0 R  o2 ~( E" v$ w
    set auto? false/ D$ V/ W6 L' ?* {5 F1 P* B5 s
    set green-light-up? true1 S0 O" B8 r* Z3 l  j4 u
    set my-row -1
) G& R8 \( o+ B    set my-column -1
  Q# I* c5 X+ j5 d    set my-phase -1& H) a0 G2 L$ G; A9 |
    set pcolor brown + 3/ Y, u9 x% o1 u: M
  ]
9 B) y0 e+ ~+ ~! J% v3 a5 E( K; f; a* W; D" G' J0 t; q
  ;; initialize the global variables that hold patch agentsets- G9 y9 N1 u' U+ ~+ a6 F
  set roads patches with! W' Q3 K: ]7 ^$ ?5 B
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or8 E+ ?3 {; ]6 W. a
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
- T; h, f+ E; `. s' u  set intersections roads with6 g; ], l) I, K! L
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and- A; X4 I+ S& H) h
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 f' v' ]2 b- [+ z, D) Q/ W1 Y4 K

8 j  x; m" G, f' P  ask roads [ set pcolor white ]
5 C9 m! V$ y& F: r9 d    setup-intersections
+ w6 |3 P4 p9 Pend$ `2 X5 A) h4 V6 f5 S
其中定义道路的句子,如下所示,是什么意思啊?! g4 E6 E) i& i- b- d
set roads patches with
* U* h3 O" a2 \( ]+ S! g    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or6 I  ~; t; e- A9 ]. r0 ?
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]+ d2 E7 o1 v/ E5 p+ _" N1 I0 @
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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