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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。; s5 j4 S& _$ ^: I, k3 X$ |
netlogo自带的social science--traffic grid这一例子当中,
) F: V" A  K9 v; bglobals
; L; [9 Q  ^% N! F+ X/ e* C5 z[" v: [) j3 ]& B/ n1 q! k5 S: W5 z  H
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
# T+ T* A3 c8 e, u  grid-y-inc               ;; the amount of patches in between two roads in the y direction
0 K- S" R3 x+ h8 I  acceleration             ;; the constant that controls how much a car speeds up or slows down by if6 d+ U" {% t' i8 H& f+ U
                           ;; it is to accelerate or decelerate, W: m8 p+ }  d6 B! ]- n
  phase                    ;; keeps track of the phase7 o6 D* Q* e9 S( i& G; |6 Z* y
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
5 [5 C# ~0 m6 S' |& s  current-light            ;; the currently selected light2 W: ?# ^0 N( U

0 Y: J/ H3 Z5 I! {; v' z% N  ;; patch agentsets, n% n2 T3 Z! l, |0 {" J; k
  intersections ;; agentset containing the patches that are intersections
, p; }9 G- L- i& T9 X% c  roads         ;; agentset containing the patches that are roads
" H7 z5 E$ |7 V4 B]/ T5 s( @0 z% T& M

% r+ _! l4 z9 F+ |) ^& m& Z5 Lturtles-own/ J5 g6 ]. H1 m3 Q
[
) x; D/ F" h- ^; h/ W) k4 O9 F8 I  speed     ;; the speed of the turtle/ u7 I2 {! w/ G! N9 C* \- d
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
3 S6 g  ^' s8 `+ G( S0 a  wait-time ;; the amount of time since the last time a turtle has moved
1 ]% y0 `2 G  H* i]4 n9 d: k8 O8 m2 t  S
% x6 [1 X& t# T; a6 a1 w4 D5 A1 v
patches-own( ?" h# ~9 L2 W- i8 C
[$ n" D' M. ]1 o
  intersection?   ;; true if the patch is at the intersection of two roads6 j0 S) Z/ f2 W
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.; ?  H4 j7 _0 z& T+ U0 T. v
                  ;; false for a non-intersection patches.8 ^: z9 `" }+ I. N1 g
  my-row          ;; the row of the intersection counting from the upper left corner of the: Z( Y* Q: u' U: q4 R$ S+ L4 ]0 P
                  ;; world.  -1 for non-intersection patches.5 _" e2 `: c& H
  my-column       ;; the column of the intersection counting from the upper left corner of the
5 ?  |- C" k* S7 X' G                  ;; world.  -1 for non-intersection patches.  `! H2 x& u; W& I
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.* ^2 D: H  T4 K9 [/ r
  auto?           ;; whether or not this intersection will switch automatically.  r3 g. x2 g" h$ V: y! s6 o
                  ;; false for non-intersection patches.% m3 N4 s# d4 \
]
4 m1 s1 s' X0 H( @
- ~( R) v2 G# U; t5 |. ]$ D5 a, P- K1 a! o4 N; e8 a4 N
;;;;;;;;;;;;;;;;;;;;;;& g8 O+ l% T2 G8 O( z! u
;; Setup Procedures ;;6 Q7 n3 w& d) u, _. J" [- l8 I
;;;;;;;;;;;;;;;;;;;;;;
7 V8 E0 Y' R7 C! g  r# @: \" X: j! n+ _4 k  f7 `) K
;; Initialize the display by giving the global and patch variables initial values.# ]1 W; @' c# ?$ q" I: d" X
;; Create num-cars of turtles if there are enough road patches for one turtle to
# r, O7 o! c+ s  F' t$ {0 j. q/ l;; be created per road patch. Set up the plots.
+ A5 v& a- d" J' E6 w2 nto setup
0 g6 z* ?' Z% n( G0 Q4 A  ca
) y3 ~( h' _. F1 |0 l/ C  setup-globals7 G) U9 R2 |$ h' v$ e1 m+ x

# p" q) o% t) u: W  ;; First we ask the patches to draw themselves and set up a few variables' v' K1 ~! J4 p: V' K  B4 {
  setup-patches: ^  X7 ~/ E7 c
  make-current one-of intersections
+ r9 d' U" y8 N% v8 ?# H2 R  label-current
& U, s1 H; U* w% r2 [  D. k/ f
, S( I% {4 R4 Q6 D+ }9 E5 r/ ?: h  set-default-shape turtles "car"
: z2 Q$ ^$ i! k; ?# O
8 w' C  [+ M$ ]% r* R+ e* C  if (num-cars > count roads)
# `* e8 `. _4 x  [! H6 ^) T: {/ N& y5 J  C
    user-message (word "There are too many cars for the amount of "
; v) J+ ~6 t2 }: t0 B                       "road.  Either increase the amount of roads "
3 K! K, v- v5 K/ A8 T4 f& M2 g                       "by increasing the GRID-SIZE-X or "; D0 z( N$ f  P9 O% \. f1 J
                       "GRID-SIZE-Y sliders, or decrease the "
& E6 c9 R5 V& q/ C" E! T                       "number of cars by lowering the NUMBER slider.\n"' L) |& N% Z; z) U6 h. m: \
                       "The setup has stopped."). \% o+ k$ L: \: I
    stop
3 ?7 B+ e  J+ X( x  ]
2 H* h6 |0 U0 N4 G8 T1 k8 T
  R( C0 l6 ?; I( {: d  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
" R' U3 P) _) K1 E  crt num-cars
8 f6 @- \4 Z7 |$ ~! _  [" ?, J# m8 ?9 J/ I( j
    setup-cars( e9 L( o1 j$ K+ v
    set-car-color
6 O: X: s- b; r: b9 y8 q# U    record-data
, E+ M6 T- z+ i  ]
4 ], \) u1 d! }; D: I
; y# S& z# Y& I! R  ;; give the turtles an initial speed
) L' C% R3 s! H8 x  ask turtles [ set-car-speed ]
( l% N8 S+ s) o2 ^) K- x. p4 N
& ~" H: I) ?$ {/ a, A  reset-ticks
. j3 A2 {( f3 c5 q  fend* w5 J/ {; [  {* l

% v5 Z; F, `( d. H5 b# b$ K' w9 Y;; Initialize the global variables to appropriate values
3 I4 a  {7 X1 F# q% `6 Zto setup-globals: U' f% ?/ c  Q8 ^
  set current-light nobody ;; just for now, since there are no lights yet
7 C) D7 _- }" F1 E7 I1 b$ x  set phase 0# b: m$ k- z8 [& n  o
  set num-cars-stopped 0
3 C8 Z& X/ e* B0 b: l  set grid-x-inc world-width / grid-size-x
4 S+ ?& @4 h/ S# a( o  set grid-y-inc world-height / grid-size-y
+ V: |, G$ A+ C9 i, D; c/ @- S0 T$ I! P1 x. G" X' p* V: K
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
: P- b- r2 K( A# i1 A: x0 d1 `  set acceleration 0.099
; _) P6 t# D' a7 U2 V6 g2 X# @end8 g) W" i1 C, V+ `
7 q1 a+ m8 E6 V
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,+ E% Z+ d1 N: J: m. U$ F
;; and initialize the traffic lights to one setting
' m- P1 K. [: Zto setup-patches$ O4 `4 R. @; O3 C; e" a
  ;; initialize the patch-owned variables and color the patches to a base-color
2 j! ^! Z2 w& ]( }' _5 v/ ], q$ Y  ask patches3 l3 M( M& T" C8 d1 p6 C% ?0 Z5 C
  [
- [% J5 J0 W& k3 ~2 o8 R$ p    set intersection? false& @+ r7 r) N( m
    set auto? false* h- O. v. |9 \8 b6 g( g1 ~
    set green-light-up? true7 o0 n% K, q1 N$ D) d) [3 G
    set my-row -1+ i0 w0 H7 w" a' g$ S' p7 C. j
    set my-column -13 J; m  r) n, @, Q! |
    set my-phase -16 u3 x6 t# ~8 x' F4 y$ E' X/ \3 t
    set pcolor brown + 3
8 U! Y9 z) d/ }1 Q, G  ]
4 ?  l$ g" v. O' Z$ c& a( I0 j$ z# I  d+ d3 T  \; a
  ;; initialize the global variables that hold patch agentsets1 K4 S4 X9 y$ p8 g4 O
  set roads patches with5 q0 U+ j( l5 j% a
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or" ?# Z: b) J! E' Q/ |* p
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
$ D' Z$ n& s# J# z$ ^4 ]% x  G# n* `  set intersections roads with
, I' X) h9 E% ]8 |    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
, l, I  ^5 b0 w    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]; s- C8 O0 H: l! F6 g. T  A

# u- [0 h" a( ~  ask roads [ set pcolor white ]: k$ p& n) `! @6 S
    setup-intersections
0 s6 E7 H3 T* o0 |0 lend
, y4 r  q$ B+ F# t. f/ v6 j5 ?! Q其中定义道路的句子,如下所示,是什么意思啊?
+ U" h# v" t0 ?( j$ a set roads patches with2 \  D- u: w  `& r
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or6 D! {  c9 y6 d* m
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
" P6 m7 S7 A3 ?- ^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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