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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。- p. R0 |2 N" X4 O; U. ?% M) l2 U
netlogo自带的social science--traffic grid这一例子当中,
& D+ Y" L6 W, M: f: P. U, D' uglobals
* k2 u, {* ]/ [) T& _6 D% w[# S) P9 R6 Q+ t7 u6 [$ c: S
  grid-x-inc               ;; the amount of patches in between two roads in the x direction; }7 e( h6 b  l' u# z( t- N
  grid-y-inc               ;; the amount of patches in between two roads in the y direction; v* k/ |+ ?- L- f2 D* [
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if) L) E9 U: P6 |0 g0 R7 y# f
                           ;; it is to accelerate or decelerate" W' _7 M5 K. A1 Z% g  q; R
  phase                    ;; keeps track of the phase' z3 D% A# L& K" t, Q* t  n
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure4 I5 T& |- x  S4 Z! ~: K: ?8 \
  current-light            ;; the currently selected light. w" d) h9 x! C& w
+ y* }& G# m6 L, G; E4 ^
  ;; patch agentsets
6 C3 j1 o! {5 e3 N+ T) A7 M  intersections ;; agentset containing the patches that are intersections
8 B! P) B) ]$ p$ k, A  roads         ;; agentset containing the patches that are roads
  t5 g! F/ r' e, r- A! C& K. V$ o]& E. d' {0 K, K9 @

5 P, i; n/ F/ N9 oturtles-own
0 [& S, a/ r3 j/ I2 h: [/ v[
+ S! P7 j4 `% \3 |: }  speed     ;; the speed of the turtle7 T9 |5 j3 F1 L+ J5 E1 q2 d7 n8 N
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
; A$ l7 |- o( s: {1 L) U6 }( l  wait-time ;; the amount of time since the last time a turtle has moved
% R3 X- i  Y1 {9 }/ w( _/ [4 r- |3 s]/ D) u" u4 @8 z# X) X9 D
. Y$ y+ v0 z2 S$ {+ v
patches-own
/ |" J) O; W& b8 E[+ X- p- U5 `: ^- M
  intersection?   ;; true if the patch is at the intersection of two roads8 K8 j$ g# p! m9 Z2 C
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.& w2 c* T, h9 @2 U& [# q4 [! r5 J. k
                  ;; false for a non-intersection patches.
0 `3 F8 X( T, O9 `0 R! E9 q3 U  my-row          ;; the row of the intersection counting from the upper left corner of the
) T% P8 G) m6 V9 g1 i" e                  ;; world.  -1 for non-intersection patches.9 h6 |( R& g* D. m3 ^6 E/ a! k; Y
  my-column       ;; the column of the intersection counting from the upper left corner of the
+ z" l& X! T, [- z; w" P                  ;; world.  -1 for non-intersection patches.* Y, W, |0 O7 p/ [  y) Y
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.4 z+ D" J1 R* z3 r% H% P
  auto?           ;; whether or not this intersection will switch automatically.7 s/ q; M  i! {8 i7 e: }
                  ;; false for non-intersection patches.# o( e9 y+ Z! i5 j+ T5 V, \4 a; t7 V
]
& V3 i/ O& h- ^. Z1 G6 u3 s9 L, w
3 |7 q- @  o- D+ a; e
3 l! I8 R8 h2 F/ f9 V+ n! I5 Y;;;;;;;;;;;;;;;;;;;;;;
" _6 E6 B: w5 b4 I( S;; Setup Procedures ;;
! t7 t/ `0 B  b; u) |( e) n;;;;;;;;;;;;;;;;;;;;;;: w0 I' k& h- a5 S

: c* D7 K9 e% v;; Initialize the display by giving the global and patch variables initial values.3 f0 t* H( I7 b9 a5 x+ _$ Q0 E# X( w) e
;; Create num-cars of turtles if there are enough road patches for one turtle to
5 H. l* Y. C0 W& F" {& I;; be created per road patch. Set up the plots.9 ]( ]" W" S1 n) p  l  {# u
to setup
* A, W% A) q* I' T0 n5 U$ E# Q& w  ca8 P9 W; a3 w' g) ]) V: s+ g2 Y
  setup-globals4 w# H+ G& E$ Z2 d) l. N. o5 a
" K# ], ?* e3 J/ |% J0 Y; m$ `
  ;; First we ask the patches to draw themselves and set up a few variables: J9 [' L2 ]0 m! o9 H
  setup-patches
( F" E/ I. T; t  \( U6 h8 X  make-current one-of intersections4 H* [! [' R" w3 i" C$ B
  label-current% ^0 T  k5 u3 d. X% H, x
" q7 V+ z2 M) E! c" W1 p
  set-default-shape turtles "car"; E* P, K/ N3 H) S" J
  V5 v/ n+ E, t# @9 O
  if (num-cars > count roads)% I+ c2 S; r) }1 y
  [
6 \0 j1 z. X# e    user-message (word "There are too many cars for the amount of "
' M' C+ ?' ?1 ^( i' y% s                       "road.  Either increase the amount of roads "2 b5 p$ h  z) B8 B8 z3 c% `
                       "by increasing the GRID-SIZE-X or "9 \9 S! F5 L. o7 E
                       "GRID-SIZE-Y sliders, or decrease the "' S" l% ~% @1 l; v. S/ R; _& y' q4 x
                       "number of cars by lowering the NUMBER slider.\n"
7 L: z, p' O- c6 y3 J' \3 X6 [6 q                       "The setup has stopped.")( U5 v! {: {! p- p  w9 z
    stop1 W8 o( z. l; u( ~1 @
  ]# N% }) s# B- j1 j6 t9 o4 v& N3 g

( H% r6 H* A) F  c( ?" c+ {  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
/ j( ~3 e4 s. t+ N  crt num-cars# x, b$ q, Q% f- G% K- e
  [
7 K9 d- B+ o; }0 G' U    setup-cars* r- A! _1 ~0 M6 |' s# ?
    set-car-color# V3 s: W, A4 N  w7 i6 g* @
    record-data1 q# w, h' {! m
  ]
8 B. h% v* ?6 J3 {6 M% c, j
& U+ T4 V2 M6 [, p9 r0 J3 Y  ;; give the turtles an initial speed$ v9 i/ o& \- V5 P8 x4 H
  ask turtles [ set-car-speed ]6 ~' E( C4 i9 G$ b4 q) r  ^
+ W% G9 P! Y+ \( ^% l- G# l. \5 v
  reset-ticks! `  e$ f3 y& U+ `, G* |! \
end
1 J$ N* M5 S. V- r9 @; Z
/ a. l( f. n$ V* E  l;; Initialize the global variables to appropriate values
/ ^: v0 r( u5 }/ ?to setup-globals
' A* s8 n$ Y3 z# z  set current-light nobody ;; just for now, since there are no lights yet
7 E: P& m; D" ?  set phase 05 y2 Y. h& L6 y+ K
  set num-cars-stopped 0
( d3 X" M) b9 i8 d  set grid-x-inc world-width / grid-size-x
1 |! x5 N  U$ d+ q% t  set grid-y-inc world-height / grid-size-y
. a1 j* x0 Q( C& p5 W- `% F& p, v# i% T; i) o
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary9 `8 N( C2 Z$ [  r7 D
  set acceleration 0.099- s% p% q0 p: b' I: J; n: [
end" K# j9 x) y/ Q% B  n! r
9 A" O* K6 \) ?- e, z/ r
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,. }! e) I( f) z; k9 |: I
;; and initialize the traffic lights to one setting
2 s3 c5 ?: u; Q  j4 ~: lto setup-patches
! w; G& K: X% D; Y. v  ;; initialize the patch-owned variables and color the patches to a base-color7 o, D$ i6 E" Y
  ask patches
8 p  E- \5 G. v  [
+ y8 k* f0 I7 E+ k7 e    set intersection? false
6 _  A6 P0 a2 }% a% [, _* J& C    set auto? false! E/ D, E, C# s5 w) R* A9 \
    set green-light-up? true* {" J! j. P  a4 _& ?6 V0 F0 W* p
    set my-row -1
7 @3 @1 \/ T" {1 ?! y, q    set my-column -14 K! y% v" G9 u7 z5 z6 W) S5 {& b
    set my-phase -1; y: i) E% w/ T3 q; W; M" o8 X
    set pcolor brown + 3( D5 y- m2 m6 F) ?) v% |
  ]7 O2 C8 b, d7 ?
- t1 d# o! f: X# v8 a& k
  ;; initialize the global variables that hold patch agentsets  t7 F" ~3 c6 G! x" o
  set roads patches with
: b  H5 Q) ?& {6 g' e" v. x/ U    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or( k" H  x# o1 d; `
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
  N- _' J/ R8 Y8 z, S  set intersections roads with9 F1 R- b" n* z8 c9 |, c. S, y
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
1 q' h8 A4 d# O! l    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]; i7 ^9 ~% d9 a" m3 c

; S% C! X7 M0 G" F  ask roads [ set pcolor white ]
; z. O7 t6 Q8 E1 M    setup-intersections
" j/ J4 V5 T* m. M5 Gend
+ o: m1 b/ v# O& w# X: w( S2 ^7 G其中定义道路的句子,如下所示,是什么意思啊?" b2 j( A6 i  \, w- D$ L9 s' M6 X
set roads patches with) F+ h  w" `  ]7 T/ }( y
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
* P! k% E  @' B; ^* D! p5 p( n# S, i    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
5 u3 S2 Q7 R/ h7 \5 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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