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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 ?) a& X. }% e% S6 Q6 x* A" B1 Cnetlogo自带的social science--traffic grid这一例子当中,
& g# ~4 x6 h/ U8 B: aglobals$ O* E5 t, Q0 v8 w
[( y& @+ Q; a4 C
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
9 L3 t! ^  ~, l" r3 ]# ^7 q  grid-y-inc               ;; the amount of patches in between two roads in the y direction
' S2 o# X' u$ a1 Y# Q) y3 a  acceleration             ;; the constant that controls how much a car speeds up or slows down by if4 [/ T3 e+ g7 S* \1 r
                           ;; it is to accelerate or decelerate. c! \- `& Q9 [) U: {
  phase                    ;; keeps track of the phase
1 y! s) w% P0 J9 R: b  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure! z8 h1 ^, p7 _# J8 n) e$ W
  current-light            ;; the currently selected light
% t% n: p+ f3 x. d7 T8 V8 w
* L( d/ J0 V6 a  ;; patch agentsets" X9 x1 O, G; S1 U& P& T
  intersections ;; agentset containing the patches that are intersections
( d  c% G8 s8 X7 z7 J  roads         ;; agentset containing the patches that are roads* o5 O0 W5 [$ f( @* V0 n8 V- M
]
# q/ T" d$ z: {0 e# u- G
* a) ?. ]8 \+ f1 ?6 C3 Jturtles-own* Y! }; J( R  S; `
[- O3 }* J3 K0 w
  speed     ;; the speed of the turtle
+ u  M. K+ o* ?* Z  up-car?   ;; true if the turtle moves downwards and false if it moves to the right6 A  v+ v7 }9 H9 Q6 c9 m0 S6 O# Q
  wait-time ;; the amount of time since the last time a turtle has moved
1 x; |- ]3 q; y( M+ Q- e6 ^]8 p. d& E9 e* q; l

1 ]3 O  R0 p7 s6 q/ ]6 jpatches-own
8 m$ m8 C  h& x[
) |$ k/ p( e7 G2 g+ d* k: p( V  intersection?   ;; true if the patch is at the intersection of two roads# I; u- f" _# D3 v$ W  k# U
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
: J9 K8 F. U/ |7 {7 t4 _; m% e                  ;; false for a non-intersection patches.
# Y) [1 j, {0 C! I+ m# I  my-row          ;; the row of the intersection counting from the upper left corner of the
9 e5 T0 P  k" T                  ;; world.  -1 for non-intersection patches.
5 v$ O# c/ R. v9 F& B+ N0 F; U  my-column       ;; the column of the intersection counting from the upper left corner of the
" j0 Z2 D( f: Y2 @8 b% K* D4 ?                  ;; world.  -1 for non-intersection patches.9 s' E8 M# `) u- o* I4 h3 ~# S! M( P
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
* B5 C! O9 l! g# B1 [. |  auto?           ;; whether or not this intersection will switch automatically.( t; W. ^/ a) k) X
                  ;; false for non-intersection patches.+ e0 |3 E) S( G
]
" O( Y& z4 j" X6 o  Z9 f5 V' m
6 N' @+ l/ ^+ U
* G0 L; u: ^; I;;;;;;;;;;;;;;;;;;;;;;3 H, E2 m! c7 y
;; Setup Procedures ;;
6 v# |6 |! }: g! ?$ @1 o) ~; ?;;;;;;;;;;;;;;;;;;;;;;
* j) G/ g; c) I) F
5 p9 ^0 g) E' T6 {! u4 T& e+ f" j;; Initialize the display by giving the global and patch variables initial values.
$ C/ a  b1 x; @3 J5 l;; Create num-cars of turtles if there are enough road patches for one turtle to8 M/ z4 V4 d! ?3 a0 W' S" N
;; be created per road patch. Set up the plots.
# Y' p# k6 z& @6 t7 ~4 Fto setup2 s4 V6 Q9 L" |2 q8 J% k" |
  ca5 U/ b% ?) q* F5 j' h1 z
  setup-globals
4 L. K1 L3 ^$ q8 c# Z+ H0 \
1 r' o& `* Y* b# O  ;; First we ask the patches to draw themselves and set up a few variables
8 X, F5 h: H5 `: W9 K  setup-patches
& ~& U; h0 }5 l; W2 g; R  make-current one-of intersections* U4 w& ~1 A. q) n
  label-current
+ q, ~5 `% n: Y. t& ?" p& P4 v
6 H: _1 A5 |1 V2 s$ H6 C- M/ O  set-default-shape turtles "car"% _* O0 N8 W; `' b* K) e6 O

* R$ j$ G0 P; D+ y; L2 `8 P; P2 r  if (num-cars > count roads)
$ S3 E( \- S6 ]; P5 V  [
9 R) J% k# _" `  o    user-message (word "There are too many cars for the amount of "
' _, j/ u1 k* P0 G4 j0 j! F                       "road.  Either increase the amount of roads "( \& r  |8 ]! [' B! X4 q6 e# k
                       "by increasing the GRID-SIZE-X or "
: x. E2 L" u- l& Y" n5 C                       "GRID-SIZE-Y sliders, or decrease the "
; a6 ~$ f: z5 l9 T2 z0 _9 @                       "number of cars by lowering the NUMBER slider.\n"
  k! c9 Z5 A) T% N" N                       "The setup has stopped.")
* L" |6 k: Z5 f3 q6 k% p    stop
4 m/ |: F) z* o# W  ]4 y2 |$ M" P8 w+ h  P$ X
0 L' O; ^5 {4 l4 s
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color+ u. H, T7 }. Z' Q
  crt num-cars
9 W, j" V, |% H8 c( x. M2 \: H  [
7 d8 m+ v# B' X    setup-cars
4 p- v% o' G! L* F    set-car-color; G/ o( C1 W' f3 A9 ]  J
    record-data' }% o7 p9 A* l9 G1 c; w
  ]5 ?. V7 ~- o0 E8 R
! _. Y. s- M. f4 N1 T
  ;; give the turtles an initial speed3 y% u! ?/ a1 p' f7 X2 e
  ask turtles [ set-car-speed ]' _* i6 H- T! c3 y! D

# g# _* @; P* Z. _  reset-ticks
3 {. l! U1 O  F  k1 x- W6 u2 iend
  V: m2 }5 r7 K" n/ C
  b4 M4 ~8 s- B+ F;; Initialize the global variables to appropriate values! i, d! P6 }. L$ P8 p9 i
to setup-globals
2 T. R. _* I( T; G- A9 t2 [  set current-light nobody ;; just for now, since there are no lights yet
  P0 p7 K% z) {  set phase 0
6 l- l# h8 ]& C9 A  H/ v( o6 e  set num-cars-stopped 0* k, _5 O+ b: i
  set grid-x-inc world-width / grid-size-x
3 ?, T/ v- S$ H  }. N1 ^# b  set grid-y-inc world-height / grid-size-y! X& O: Q3 Q+ [0 B& f2 Z4 z/ ~/ y" Q
# i) v& }  p2 _8 {
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary6 H, t; v7 u% L( U# b; k
  set acceleration 0.0997 I: J( [, t) G; g  n5 P$ ~
end+ F$ Q- y# r( }; m

; }" j# p$ }+ i- `( G" N;; Make the patches have appropriate colors, set up the roads and intersections agentsets,  [# B+ i' P) A: q& {2 r; I
;; and initialize the traffic lights to one setting
- ~# M' T1 G& u, S, eto setup-patches
* {% |* H5 C' K) w: y3 m& d' Y% [& E  ;; initialize the patch-owned variables and color the patches to a base-color9 L6 H1 b' Y2 k0 K- V1 C: [
  ask patches
, W- y" K0 B: x  S  [1 j6 W* {% I7 [- c: x
    set intersection? false
: h; V4 [# z0 P7 S    set auto? false$ g# v1 S! y3 H  P
    set green-light-up? true3 m* q: n2 c9 T- S
    set my-row -1
# {, U! g. y$ ]2 y6 r' h! b' T    set my-column -1
4 m4 k. e8 L, j9 ^6 R    set my-phase -1% ]# V* t( `* {7 U
    set pcolor brown + 3
6 J9 X1 G! m: ?  ]
4 I8 v0 o% q) J- W% w3 l0 v
3 D3 h! h* a2 R9 h( Z$ R3 F( W  ;; initialize the global variables that hold patch agentsets
+ }3 U, [4 e- d  set roads patches with( V- o# N- z2 H. e! T# |0 b
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or) N: h6 T8 t6 e4 s
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 H1 a+ S3 G) y: ]
  set intersections roads with
1 S2 R+ T$ d, o! u; l% z    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
1 g, u! v  U. l! s9 c" C% F! S    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
4 l9 J5 R& {* r, G, H  i  _' B3 Z3 U; g' L
  ask roads [ set pcolor white ]# @4 [+ G* ^1 H8 _/ Y5 O7 ^
    setup-intersections
! V4 ~' W% K, o) f2 R1 Kend
/ ]# H- n$ K7 C6 g$ N其中定义道路的句子,如下所示,是什么意思啊?( N! G6 H. R5 ~: d& E: R
set roads patches with
; r5 V* Q7 u- ^- u6 ]4 z2 p    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or! B$ Q! ?  j: r
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
# a& h. q( {3 @. |5 m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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