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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。
6 `+ C6 C4 n5 I* @netlogo自带的social science--traffic grid这一例子当中,
( {. Z/ G5 g: A) iglobals5 z4 p: b  Q* W, i- c: r- l
[
; T' d% q/ O0 t0 ?3 T" t  grid-x-inc               ;; the amount of patches in between two roads in the x direction8 D- c& y+ I  f1 Y  i" D
  grid-y-inc               ;; the amount of patches in between two roads in the y direction$ c% e  }+ J1 P& t0 H( o+ ]4 j
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if  Q4 W8 m: j! W; m5 I2 L
                           ;; it is to accelerate or decelerate
) K  `. b1 y6 y1 ~. _  phase                    ;; keeps track of the phase1 e, [3 t: h5 Q
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure! Z% _& d. y& o* Q
  current-light            ;; the currently selected light
/ a* v: j: B# U& a% e( K! O
& N) i( o/ `5 j" ]  ;; patch agentsets, I+ |2 I2 q& g, H
  intersections ;; agentset containing the patches that are intersections
: L2 a# I# l% r) U; E  roads         ;; agentset containing the patches that are roads/ s' ^$ ?( s$ f) O
]
; ]% O* K% a3 X4 l& r2 p: D8 ?/ {; e) i; q% Y, P+ u) s
turtles-own
/ `8 {# X- Z- ?5 O+ q$ g5 o[; ]: @' j) G2 @0 ~
  speed     ;; the speed of the turtle
0 a7 e$ Y: a; n+ c: S' t  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
7 b2 m# L% H, b  wait-time ;; the amount of time since the last time a turtle has moved
' m) i4 p$ V+ a. `. A& s]
. _) A+ n% s) e- o) ~4 @1 W6 f% W# A6 Z0 T4 Y
patches-own( m) m# h8 v* |+ U9 [) l) r/ o: G
[5 e- [! u5 m% p7 P/ `
  intersection?   ;; true if the patch is at the intersection of two roads
5 o; h# l% K8 b$ `  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
2 m/ x. `; d! ]0 }! J                  ;; false for a non-intersection patches., \3 l' a3 s2 t! e; B
  my-row          ;; the row of the intersection counting from the upper left corner of the( d1 P/ ?) x" U' Q2 `
                  ;; world.  -1 for non-intersection patches.2 M3 m, V; C5 N  R
  my-column       ;; the column of the intersection counting from the upper left corner of the
$ J- z2 q: M2 x6 G                  ;; world.  -1 for non-intersection patches.- o# ~* }" W1 ?4 o# C5 F$ I
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
5 F; y7 k4 D: l5 j% f7 \  auto?           ;; whether or not this intersection will switch automatically.0 s; u: J2 m$ s( C& w
                  ;; false for non-intersection patches.* d  U& i/ {% O: R. `$ [7 p
]$ N. e8 C9 ]8 c. T& t
! P! Z0 t. [3 ?6 Z7 R

# Q: u8 k; i! Z7 X% x4 d- L% y4 v/ r$ m;;;;;;;;;;;;;;;;;;;;;;
2 A7 _" ]7 @) C: E8 ?2 m6 d" E. H- R;; Setup Procedures ;;
  V1 n; F2 r2 M, K! Q;;;;;;;;;;;;;;;;;;;;;;3 R( A0 s" _6 Y7 Q& G

1 H7 S  d8 G- _6 ~; p  `;; Initialize the display by giving the global and patch variables initial values.
- n3 u* }! u" o4 I" x8 U% e/ w/ w;; Create num-cars of turtles if there are enough road patches for one turtle to. Z; r3 s& l2 [8 m' x
;; be created per road patch. Set up the plots.
6 x  u: T! B! Q" H& Zto setup
( a+ |5 S3 s- c) {- g4 \  ca# s1 i3 X- r8 X& ^
  setup-globals! u2 r1 f* ?! A# Y- k* Q7 `6 V* ]
2 c. d3 ]- j# G0 _7 f7 n
  ;; First we ask the patches to draw themselves and set up a few variables5 S: n; r/ I' H% k) w4 R* q6 g
  setup-patches3 `/ P9 I- [% Z. \
  make-current one-of intersections
8 t6 Q( T) `3 ~1 r  label-current/ R* L0 P2 Z0 k$ ~7 K. V* Q
' s' I) b9 c& O$ {  n' h
  set-default-shape turtles "car"8 P* D2 m7 l0 k: j! P

0 W. u' s4 H8 i5 u$ S9 r  if (num-cars > count roads)3 @- J6 {4 X2 r! O* W4 ~
  [- m. [. O9 K& w5 k. E
    user-message (word "There are too many cars for the amount of ". Z& e& f3 i  }2 N, q) p0 ^2 \
                       "road.  Either increase the amount of roads "1 h) w* K: q1 F0 U
                       "by increasing the GRID-SIZE-X or ", C, v0 I% \* m- W& _1 z- P. u" _
                       "GRID-SIZE-Y sliders, or decrease the "! z* u+ E1 `4 W& S, {+ K7 Q
                       "number of cars by lowering the NUMBER slider.\n"" l- Q+ R$ n6 ?' C6 A! B$ {, r
                       "The setup has stopped.")
6 P6 m6 }2 a9 u; r' w5 P    stop
' m8 x, C* ~% ^/ ^, N  ]1 A* {9 X6 ^4 c$ {' A  s
0 F/ g# Z/ f1 j2 v0 N
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
( q, X5 ]8 s% p, X) W9 @  crt num-cars
( M$ |$ Y' M' ~% Z5 y  [* f3 U" b1 W3 y; X' x- x+ P
    setup-cars
* X# P  e0 `4 S5 C5 I/ u    set-car-color
: u  v* d9 s* C1 r    record-data
: P8 g4 X, A; }* g: S  e  ]1 A" Q9 D7 M; E: |( t$ Y& Y, b

' \( y- ~3 f8 ]5 v3 S( q  ;; give the turtles an initial speed
( o: F+ P% J; l) L4 |  ask turtles [ set-car-speed ]- P' p& v% A$ h0 ^1 }
2 r$ _+ R. D: q
  reset-ticks4 l- ?: T$ T8 ?0 {# u- G
end9 m. L, c  V5 _/ a* k7 n

% ^' z& p4 K9 j- T6 t;; Initialize the global variables to appropriate values0 K) l$ `0 A% S1 t9 a
to setup-globals  K/ h2 |9 ^/ q& n* D7 z
  set current-light nobody ;; just for now, since there are no lights yet
+ r; I$ p9 t( |4 z, v6 w. {. `  set phase 0
! r4 M) W! t& P, U4 L0 b! h  set num-cars-stopped 0
3 Q1 x1 v! d& k) |% V  set grid-x-inc world-width / grid-size-x2 `# y, H6 ~6 B( V* J
  set grid-y-inc world-height / grid-size-y  s6 T% W, [  y0 }
7 B+ R: L- t' ^
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
' w) Y4 }+ H" w  set acceleration 0.099
. D; F: j( ?0 ~% }$ S# U; Eend
/ q: o& w' \9 r3 d8 d) c
0 H1 g- X7 m! n8 P( \" s;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
" x6 n$ B' n, s;; and initialize the traffic lights to one setting/ G8 O6 @, i+ y. C7 A. y
to setup-patches
5 j1 L  t! p2 D  ;; initialize the patch-owned variables and color the patches to a base-color# \" o: l4 Y3 G) C) l: b
  ask patches0 h4 \: K# z* ~* \) ^
  [4 k* a7 A5 j$ ], O" z
    set intersection? false6 R" n9 n: ^1 s9 G* g5 [4 B
    set auto? false
1 t1 ~0 t9 q/ I7 Q% p3 E    set green-light-up? true
2 U) H( m; b& N8 _' S    set my-row -1% V& [# w9 t- v- q( B2 ~
    set my-column -1
: ]3 x9 V. F; z, t" N    set my-phase -1
4 W5 n" A! ]1 t$ O    set pcolor brown + 3- ^4 G7 |/ t4 x* r* F; n0 B2 v
  ]6 {3 [% o9 n' {$ R

! P5 `9 q$ i3 _: l/ S  ;; initialize the global variables that hold patch agentsets; \+ l2 D) W, u3 T
  set roads patches with: ?/ Z6 B# V9 O- q
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
. _' C' D3 D3 e    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]  z$ }' k  M9 v% c1 n
  set intersections roads with7 N% o9 D5 a0 X( y
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
+ Z4 O5 i$ {  ]; i3 r    (floor((pycor + max-pycor) mod grid-y-inc) = 0)], e4 ~& r2 }5 Q  t8 N% o4 q- a3 x
5 p# G% R/ p  x+ k; u
  ask roads [ set pcolor white ]) Z2 r# @  |9 I9 P9 n1 Z
    setup-intersections
4 d' m( Z. x2 m' e7 ^end
0 G3 q3 h( v% p  t其中定义道路的句子,如下所示,是什么意思啊?
7 ?1 t8 K* `6 o; n8 E5 g" E+ L& H set roads patches with
0 J, Z" w0 d0 P# ]4 D) k. o    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or; p9 Q- a0 u. B/ y! [
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
- f% ]0 |5 M0 o" F) w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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