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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。
( ^+ {9 V: |4 w6 F+ t. |* Unetlogo自带的social science--traffic grid这一例子当中,
- D0 a, m2 F# I0 `* u' xglobals3 u4 H/ |& y& H! U) y- O
[
) ^. }  r$ T6 t- B% g  grid-x-inc               ;; the amount of patches in between two roads in the x direction" r2 ?, Z3 \* [9 U% U3 r- m$ O
  grid-y-inc               ;; the amount of patches in between two roads in the y direction" P4 O+ D' k" b; j. v
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if( ]2 ?  y6 Q6 }1 U9 W, X8 D
                           ;; it is to accelerate or decelerate- b' R5 R# _; z* T! y' g, P
  phase                    ;; keeps track of the phase6 x/ Y! g) n" Y$ x; H
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
7 m6 B! ^* A' c9 V* s  current-light            ;; the currently selected light1 n3 g* S0 F8 m/ ]. K. L0 n% T/ _
( j; T8 t: G) }& ]# V0 g4 `7 R
  ;; patch agentsets
3 a) D3 F. i2 ]( X  intersections ;; agentset containing the patches that are intersections; p) q" Y6 j: J, L1 A& q0 q+ u$ F
  roads         ;; agentset containing the patches that are roads
! Y) f+ s( z  o  ]; u+ d( I1 z]3 Q! D, b# Y* u! N$ k% k8 y: @
" @- b$ s% R$ h: O
turtles-own8 M" Q7 a: O. H! o
[8 D- w- W2 Q1 g6 T% F" {
  speed     ;; the speed of the turtle
$ Z( j0 a  {0 i& c( n# O2 _  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
# @% a' t7 B0 X; C  wait-time ;; the amount of time since the last time a turtle has moved
5 B" M. G  ]9 m4 b]
* f. h. Y! v/ ~2 N7 @' v- Z5 m" D! {  n$ v+ ], E
patches-own( E7 ?3 I$ ^! `9 Z
[6 N' r: s( _% ?" R) U1 E" {, R
  intersection?   ;; true if the patch is at the intersection of two roads
% l/ Y* @9 |. ]$ b  green-light-up? ;; true if the green light is above the intersection.  otherwise, false./ H3 h( w4 y. ]$ X- z; x1 O
                  ;; false for a non-intersection patches.; d2 L- }$ m$ q- K
  my-row          ;; the row of the intersection counting from the upper left corner of the
. s: H% q* U2 l! w# }, ~* B: Y9 T5 {* i, [                  ;; world.  -1 for non-intersection patches.
: d* \* _7 W& E* I& e  my-column       ;; the column of the intersection counting from the upper left corner of the1 r+ x" o/ R: A
                  ;; world.  -1 for non-intersection patches.; A) m9 n1 r% w- n  J: ^
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
- I8 j4 f& q: ^" c; s! k7 E+ r  auto?           ;; whether or not this intersection will switch automatically.
0 I6 H; G; M3 u6 v                  ;; false for non-intersection patches.
  v& r, A4 g$ c+ T/ K* F8 |' V]
0 A/ i3 U2 j: W4 o# w* ?' J. v4 l/ \

* |& y6 M$ l4 T# |3 {;;;;;;;;;;;;;;;;;;;;;;
* _. R3 I2 ]$ ?9 H; q" p;; Setup Procedures ;;" n" K0 N7 T4 Y: L9 H% U3 \6 d) b
;;;;;;;;;;;;;;;;;;;;;;+ K5 ~* L5 E" O: L; s: _

7 [& L4 ]$ b; g, o3 s. l" g% I;; Initialize the display by giving the global and patch variables initial values.
6 l6 X, j# _; V) h- D;; Create num-cars of turtles if there are enough road patches for one turtle to
+ A: U' K! h7 ]; @, E6 Q: Y;; be created per road patch. Set up the plots.
5 r$ c3 Z: y9 {1 A5 r; ?to setup' M6 w' W0 c& D& D& X% P# S9 ~; e
  ca, |/ v1 N( a. {2 r9 P3 P$ t) K
  setup-globals
7 `9 Y$ }, ?- }- u
% ]& c: c+ O& @8 z  ;; First we ask the patches to draw themselves and set up a few variables# ]/ m$ o  l0 ?( E$ n" X) U2 I' d
  setup-patches+ K7 S, y1 H: F: E& C0 f$ n
  make-current one-of intersections
& j. Q' c4 e$ A  label-current" [+ d& X) L' T9 d4 s2 Y; M: L, {
9 B: f; p3 F1 c# ]! ]* ?$ }
  set-default-shape turtles "car", I" d4 v  E9 i1 p, Q
" g& F2 C* E0 f: f; S$ E; |
  if (num-cars > count roads)( g( H2 P: g$ |8 c, ~
  [6 m! f1 ^/ f* O
    user-message (word "There are too many cars for the amount of "+ Y( c+ K. z. P+ n
                       "road.  Either increase the amount of roads ": F$ j) Z& h3 Q9 Z3 x
                       "by increasing the GRID-SIZE-X or "+ K( ^$ Q" x! V5 u
                       "GRID-SIZE-Y sliders, or decrease the "
3 g9 @! B" A2 T                       "number of cars by lowering the NUMBER slider.\n"3 [  k& `+ |6 V: {
                       "The setup has stopped.")
5 u' Z6 T& A5 S2 Z8 G    stop0 k( U3 M: R" E5 p' o! a
  ]
% y& q7 \" Z2 N/ N/ |
+ Z$ W, B" Z& {7 c# @# U  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color8 z" ?2 F2 X6 A! B
  crt num-cars3 S: P( ^- K+ G% q$ Q, v+ f1 f
  [
. P6 d) V2 S0 [+ D    setup-cars- E/ |0 L- f1 N- x
    set-car-color
4 i0 {. S" L/ p2 r; m    record-data( f5 e+ n  Q( t9 X
  ]# ^% h  r- p* Z

) j! l/ w; l; U' E/ G7 r3 z( y  ;; give the turtles an initial speed
2 g" d( W1 Q; {# l  ask turtles [ set-car-speed ]  p" |! R: N% c3 ]3 T: s& T( y

: N! M3 f; r# V/ j1 {" \) a7 W9 s$ A  reset-ticks) K6 L" I8 G6 p2 F0 i0 G
end
8 \1 ^) `* F$ H3 O# {" e) V# z7 K! l* ^+ v4 p, p' j. `
;; Initialize the global variables to appropriate values; u/ ~6 p5 s& @
to setup-globals
3 S; m& z# e8 A  set current-light nobody ;; just for now, since there are no lights yet# v& P9 O. ^3 |! L9 a8 P
  set phase 0
) a, L  M9 o, O$ |( K8 I) S  set num-cars-stopped 0; X# b9 V3 P4 |8 w" z) _0 v9 q0 {
  set grid-x-inc world-width / grid-size-x0 G0 \. J, A0 a% {: T3 y7 a2 V% E/ U3 q
  set grid-y-inc world-height / grid-size-y7 ?1 A. _, B9 h% l/ ~& q0 i, I

5 o5 R9 L/ C, d5 g% }  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
$ ^$ t6 p- D: z/ P  _  set acceleration 0.099
. o4 Q4 ~% Y. ?5 Pend& J3 v; _; e& ~( m$ a4 l

0 t+ W& q  V& h5 B. a% ?/ @9 Z5 y;; Make the patches have appropriate colors, set up the roads and intersections agentsets,# \( P- Q7 I' N8 l
;; and initialize the traffic lights to one setting
  Y: g' ~( O6 w. V+ a2 U" |to setup-patches
; S$ c  l( ?# f" s( u  ;; initialize the patch-owned variables and color the patches to a base-color
. s7 f, Y0 d& P2 x/ V: @! m  ask patches
# Q+ C0 @4 C0 O! S) x, p# N, X* L' ?  [
/ `5 z, J# Z! Y9 V    set intersection? false
3 K2 @8 E, L0 p0 O0 Y    set auto? false
5 v$ C. o$ K7 P# c/ j    set green-light-up? true6 ^" H. }6 K. p. y, f
    set my-row -1& }1 t/ N6 J+ z# }# j( L
    set my-column -1
4 [9 F3 M* L6 e    set my-phase -1
1 }  s2 R. y# N9 a0 ]8 a    set pcolor brown + 3
7 c/ ?7 _8 Q4 B  ]
& ?6 h, Y* v. a( \- \6 j6 U! A4 j9 L; a7 ?2 z0 f' V
  ;; initialize the global variables that hold patch agentsets
: N- p. s. e( b  set roads patches with( ?$ ]/ R% q/ n. ~' u, T% b
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or$ b0 O6 e5 Q% Y* c# t1 i. R- {
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 P3 C1 X' ^' e8 b3 u1 \+ g+ g, h  set intersections roads with
, Y4 F& q- k5 m: T2 E    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and6 y+ V; M2 x9 F9 v. e
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]* n' `6 |) Z( `7 x) d; ^, v- Z

8 s; B; h6 l( q0 p* b2 n  ask roads [ set pcolor white ], {% K, s) X* m+ v! D9 `
    setup-intersections4 f. R4 v; _+ |  f
end' e0 t2 E: z7 z( w9 p
其中定义道路的句子,如下所示,是什么意思啊?3 X; ?, |, C3 R, S- d; @
set roads patches with5 u8 A' x# W/ D5 Z9 @
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or8 W1 {+ t4 Y. h- z9 X/ s
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]- [; ?; @5 c6 H( l
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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