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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。
% [2 D* d- U0 K+ Z) rnetlogo自带的social science--traffic grid这一例子当中,
$ q, g- B- _! ~, |globals. q9 M: x9 ~! |+ w) J
[0 B2 O1 c/ c1 L, c) f" S$ n# m
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
- L7 h9 `6 T/ {: y5 ^* T8 ]6 `4 F  grid-y-inc               ;; the amount of patches in between two roads in the y direction6 c6 |/ i% j1 f
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if' _9 L/ N( A: `% p2 I! y
                           ;; it is to accelerate or decelerate/ B& u  |& I( K- \: U
  phase                    ;; keeps track of the phase- i% i6 v$ r, Y. _% I! d
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
! h( X* x" m( U2 z2 ~4 C  current-light            ;; the currently selected light
: M% d) d3 d" l8 W, S, {* q% W& ~% R5 {+ U" o" \+ [1 Q
  ;; patch agentsets& Z* h& F7 c& ^2 g
  intersections ;; agentset containing the patches that are intersections
. U* o( m8 `3 y% |# r5 B  roads         ;; agentset containing the patches that are roads
  S7 |* z$ J* T3 f" J* D: a]& D0 s4 l! f" |# z. d5 s) a
% a4 w3 x( \) O+ e" Q# [% s
turtles-own0 S+ u+ N/ ]+ O/ J, T
[
( V8 K, z+ k( X+ y/ Z$ f/ i/ {" G  speed     ;; the speed of the turtle/ B2 D- J( p: ~, E1 ]
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
8 F  x$ ]- T: {1 O% }  wait-time ;; the amount of time since the last time a turtle has moved) h: [2 N! K9 D2 E9 ~4 e9 s/ }
]
& n2 E8 j% K( ^  c0 F+ u" O5 l5 C8 P0 r4 ~  g
patches-own0 v/ ^) l4 e8 ?3 Y7 n; ~; y; n
[" c- V( b, g: x" j$ Z" K5 _
  intersection?   ;; true if the patch is at the intersection of two roads* \/ H- ?: a1 x9 z8 i4 v
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
0 y! w4 W6 I) r9 d3 l( V                  ;; false for a non-intersection patches.5 e& u; d6 T( K
  my-row          ;; the row of the intersection counting from the upper left corner of the" K4 j6 Q  E! ~6 g$ R" k
                  ;; world.  -1 for non-intersection patches.* H# |' D; I" u1 P- m) G
  my-column       ;; the column of the intersection counting from the upper left corner of the  t# Q  N2 k# u4 p
                  ;; world.  -1 for non-intersection patches.
3 q2 t5 J! [1 c: x+ I# A  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
% t, n. i6 z4 a  auto?           ;; whether or not this intersection will switch automatically.
& Z) S- z6 E9 d& L% A# F                  ;; false for non-intersection patches.1 e6 a/ C! \# D$ X) d6 o9 Z, T
]" d- o. S4 l1 x" `1 ~) S
# ]/ x* D1 M0 \! k% p0 m
& X% G0 b/ R4 G* K
;;;;;;;;;;;;;;;;;;;;;;5 x0 h# l& K$ Y  ^
;; Setup Procedures ;;
8 V  T0 n' X3 a7 ^;;;;;;;;;;;;;;;;;;;;;;1 _! ]$ b4 J4 I8 e. E5 k

' V. I: R1 r2 ^6 _3 z; a;; Initialize the display by giving the global and patch variables initial values.: k2 V& `) `: ]0 S7 b, d  Y
;; Create num-cars of turtles if there are enough road patches for one turtle to
9 m  \+ s0 S8 G* f- K: d! p;; be created per road patch. Set up the plots.' q6 H6 i8 A- A8 L* H# [' m
to setup! G& @6 w/ e9 x4 z# G
  ca
7 U3 ]/ J$ g- M) d& j  d: j1 o  setup-globals
1 {% E, p( ~8 H6 N5 ~9 c7 R
7 x1 c9 p0 p+ V3 |: q$ n  ;; First we ask the patches to draw themselves and set up a few variables
% Z4 B/ ?# ~# h1 }  setup-patches! o5 Y1 }& o; N1 [3 @( G. g1 N7 Y
  make-current one-of intersections& X$ c' |& ?6 m4 s
  label-current. z9 u7 Z/ |# {" |) K5 ^

( W  s) p. _1 k  set-default-shape turtles "car"
" Y/ z2 Z6 m& a! m5 x; e* g; Z4 U5 B% j
  if (num-cars > count roads)
& T7 ~! H# c1 R: {  a! F0 X: u, q: L0 z  [
) M/ e' }9 M6 U* h    user-message (word "There are too many cars for the amount of "6 |& G5 B4 E( L" d. h* ^4 Y; }
                       "road.  Either increase the amount of roads "
% z2 r7 D( C& {& q                       "by increasing the GRID-SIZE-X or "* ^9 Y( Z6 O% k8 S- W0 B; C
                       "GRID-SIZE-Y sliders, or decrease the "$ J# v8 N! U' D. P$ o2 w' Z, {
                       "number of cars by lowering the NUMBER slider.\n"
" q) [9 M# D- x6 @4 c' H                       "The setup has stopped.")
6 i2 S3 V2 ^  k; U1 t    stop
: q, ^/ v/ L" L; ~. g8 `$ p  ]- Q/ \7 }- F" [* ^$ z6 z6 f* p& e7 v

; L% I& c. }5 j' _9 f  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
- C0 `! t: a: Y  crt num-cars7 M' v  U( e+ ?1 h
  [5 L! J% S6 \- g2 ]5 G3 J
    setup-cars: {7 w+ c& F4 w) G" c2 G; a! D
    set-car-color- Z  Y. V: r& F
    record-data
4 e/ l9 @+ q0 d9 {: ^- v4 V" p  ]! q$ J7 t2 a* m0 x1 _6 T3 }6 _

! I' }! T7 S9 t4 ^, a( I, b" E7 j  ;; give the turtles an initial speed$ \. d  e; p2 n, _/ n
  ask turtles [ set-car-speed ]
& ^6 a3 x! P% }8 T, x( h6 R- e. q( E; b
  reset-ticks+ _( c9 n# o; `* ^1 v, |0 Y  J1 C
end
7 a+ K* `# F7 H" g# C0 _6 `  j$ r) A: x+ J0 X
;; Initialize the global variables to appropriate values
: U- r7 v9 L' a. B1 d) |" U% |* hto setup-globals
* A  D- z6 E9 F7 F# {1 P0 E: {4 H  set current-light nobody ;; just for now, since there are no lights yet
( K0 U9 x- ?0 @  set phase 0& l& C' }/ m* \# V9 R
  set num-cars-stopped 0
* I9 n& A: g7 L3 m# F  set grid-x-inc world-width / grid-size-x& d6 C6 w% f! g7 [$ \/ W
  set grid-y-inc world-height / grid-size-y' q4 G( c/ f- C
  m+ X0 t* Q2 u4 p! Q) Q
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary2 j' W: m( C  Q8 n
  set acceleration 0.099
  ?$ I$ h2 F1 p( F6 Q1 w$ Y3 Hend
9 ~! A1 w2 P( i* M3 }% W; |5 d
5 K( {8 u9 H  p; x! y1 W;; Make the patches have appropriate colors, set up the roads and intersections agentsets,& i  M6 H6 V& ~/ v
;; and initialize the traffic lights to one setting
: c4 w$ I' j+ o1 ^2 q3 r7 K. H8 M$ Nto setup-patches
3 V3 ]0 U6 p/ d5 T- P/ s" N8 q  ;; initialize the patch-owned variables and color the patches to a base-color9 T# R; W! p0 m, P4 H' h
  ask patches
' e6 ~% }# W$ E# p  [
# `0 v. G0 O6 ^; ?0 U( G" H, z    set intersection? false
7 X( v2 a$ `! N8 ]    set auto? false
3 U6 {8 ^3 T" z2 U: E$ v    set green-light-up? true- x* ~- C, u6 ~" A2 V, o; \8 Q
    set my-row -1
+ r; c# N  |% J" P* U; ~3 ~' J' V. ]    set my-column -13 Y/ m7 g* Z- y' C* s9 p$ }1 f
    set my-phase -1
& \) A. ]! J$ u; R# ]( f$ J    set pcolor brown + 3! \5 r8 b! d8 }; H  {+ Z
  ]6 j3 ~. d' m( x6 b- [7 i
6 N  ^% x3 J7 r& ?! L
  ;; initialize the global variables that hold patch agentsets
% s7 p" c/ Z" H7 X  Q4 A  set roads patches with( r; W0 Z  K$ c4 l$ K5 ]1 a
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
: d* N* p4 [  W    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]- V1 U7 C* O) m! c1 T3 Q
  set intersections roads with' `; @1 `6 G  P+ \
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and- h0 m* u6 r+ Q$ u4 B* P9 S& M
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]; }7 D8 c5 i2 p9 J1 p6 F

0 _$ k4 |7 Q6 O, d3 j  ask roads [ set pcolor white ]
* H/ D) \1 {. W: J& S3 h. H    setup-intersections* ?. B5 Q! R, c  H) U7 |
end
' n% ^- N: l' C  F7 q- I其中定义道路的句子,如下所示,是什么意思啊?$ D# f/ V$ C# g; _
set roads patches with
* u1 E& @. P: M4 [    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or: o/ ]+ u& H4 Q% i9 J, u8 j  [2 i( D
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
% h$ Q! u7 [7 m1 {1 c, @8 v; A) ^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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