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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 X6 ^5 P7 d5 ^% nnetlogo自带的social science--traffic grid这一例子当中,7 f5 |* ]# N, \# r1 M
globals* q  _4 s/ E. `0 @
[0 d0 c% T5 c- F' V0 I4 ]& M
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
3 y8 |8 i8 k  g: `  D4 X  grid-y-inc               ;; the amount of patches in between two roads in the y direction2 G2 }0 S$ T( l
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if% ~5 h  \. ?! V. N  C
                           ;; it is to accelerate or decelerate% F1 B6 t2 D+ ~6 {9 x
  phase                    ;; keeps track of the phase
  x+ L4 S0 N" p. x" q) j  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure7 b5 {) Q9 v1 q5 m! F4 D) x
  current-light            ;; the currently selected light* @' i% G! ]: d2 I
" b) a; `1 _* U& {( i; P" Y
  ;; patch agentsets
; {1 S- D- x/ N3 C, ?  intersections ;; agentset containing the patches that are intersections
9 f& w' F. {  R  roads         ;; agentset containing the patches that are roads
4 _! ?: K1 A. u, w4 L]* x+ T5 [$ V) h- J) f5 Z

2 M3 M2 i: L  [turtles-own
$ \8 o; L+ a9 s/ N/ S: c[2 \/ k, s9 R; v
  speed     ;; the speed of the turtle
# ^5 Y* B% A& _" t9 x  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
2 k) c! w/ F8 a" P8 b  B& X4 S" `  wait-time ;; the amount of time since the last time a turtle has moved$ p, c0 f. W% e, _
]
' q0 X3 O# q, Z: M. Y# E
$ {, J+ X+ S3 y. M& L1 Gpatches-own
& X; s$ d4 d/ j6 \% h4 T[
; f1 P  Z' d) u% V2 K% K& c7 t  intersection?   ;; true if the patch is at the intersection of two roads
# y3 R4 [! r( J5 z! m' D% x  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
5 e, p2 D! {' P  [" a                  ;; false for a non-intersection patches.- p8 q0 [2 _5 N& `2 H
  my-row          ;; the row of the intersection counting from the upper left corner of the
/ `# {% P$ O1 b0 m4 T% K                  ;; world.  -1 for non-intersection patches.1 S# D/ ^$ o$ o4 K) B: G
  my-column       ;; the column of the intersection counting from the upper left corner of the
& t+ T1 z8 W6 I- w* R                  ;; world.  -1 for non-intersection patches.& C3 X! \! F1 {8 C3 H, s1 x
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.5 h0 A+ q  I& Y
  auto?           ;; whether or not this intersection will switch automatically.+ |% }  ~( M( u' b# X
                  ;; false for non-intersection patches.2 C: [0 D' A: x9 s4 f# A" ~
]
: u: d% h6 [" `. z# x- {! `# s6 I$ ^( G* W4 D  ]+ d

- H4 u) S# E8 Q;;;;;;;;;;;;;;;;;;;;;;
5 S- E, O4 F$ I9 b) `: b;; Setup Procedures ;;9 s, y% h( ~5 i) X' r3 ~
;;;;;;;;;;;;;;;;;;;;;;
$ a; k5 S9 l9 l0 |, s# i; b
) p) r( k5 b* C* Z$ H;; Initialize the display by giving the global and patch variables initial values.
' \( X* Q& D' q; {$ E;; Create num-cars of turtles if there are enough road patches for one turtle to0 h. A+ i9 G' `: o1 ?6 N
;; be created per road patch. Set up the plots.1 d  _  q3 N" w
to setup( N% g3 P3 u3 e1 |
  ca6 l$ g* p. e& L. \
  setup-globals1 p) s  a/ o( T4 Q& f+ \

7 x- c! B% u, Q: J6 Z8 N+ V$ [  ;; First we ask the patches to draw themselves and set up a few variables
  ^( @1 ?8 g5 y7 V. m  setup-patches8 a0 ~" y- r) {8 U
  make-current one-of intersections5 }: z  v  e: n+ g
  label-current$ n1 ?! X( y/ _* T$ J! q
6 K) O* D; P4 N: ?! C7 c
  set-default-shape turtles "car"
' F1 T: L& ^, I1 \1 R& q2 r1 b) @. o. X" I# H/ q
  if (num-cars > count roads)9 K2 Z& j1 D: t. C* _. N
  [
- s0 |$ @5 M3 x- |: `4 f' v    user-message (word "There are too many cars for the amount of "
7 B" p3 Z4 F/ g4 U, j- m                       "road.  Either increase the amount of roads "
9 H" k2 G/ W" X+ ~" l' K7 v                       "by increasing the GRID-SIZE-X or "
# ~+ X( x) U0 V0 i7 k  S                       "GRID-SIZE-Y sliders, or decrease the "9 c6 u( b8 o2 q3 c" t. M( A, K
                       "number of cars by lowering the NUMBER slider.\n"0 B( a# f! d! W1 ?5 g
                       "The setup has stopped."); ]) |/ p7 q# y  u& h3 N/ K
    stop) k9 w& B+ {3 ~* Y: r5 J& h" S
  ]
- |3 ]& S0 H( h' l7 S4 A# ]
6 e4 ~6 |* P' O  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
5 X+ V- J  G. ]8 `5 \. i  crt num-cars
; m9 A5 t0 C8 K% ^5 z, H2 z! n  [0 h4 B3 J) D4 a" t  A# r, n" u3 y) k, t
    setup-cars9 V9 g% i' j3 e6 h9 Q3 F
    set-car-color
% Y- }( F7 }+ x7 R    record-data
& u6 E* R* r& H& N7 J  ]
) l9 t4 k) ~7 o: b
( G* N7 ]1 V. m7 |$ r5 z9 o- s  ;; give the turtles an initial speed
; {" _  Y: l' M5 M, Z& D  ask turtles [ set-car-speed ]  a7 t9 i" U, y( T0 r9 Q5 F# ~1 C+ V

$ S# b  r3 O+ a2 G7 L& ~  reset-ticks/ Y6 d4 K! Q+ O
end
2 @- ~9 Z3 a+ @9 k/ D4 l8 I) [) z
) c7 G( @6 Z& Q. W;; Initialize the global variables to appropriate values
: I) a9 X! s  \5 q* gto setup-globals
! ~+ `4 [7 s! n0 M! R  set current-light nobody ;; just for now, since there are no lights yet
4 |, o) q2 T0 S! ^& J  set phase 0
6 z4 U7 a/ |( {6 c8 V( _  _  set num-cars-stopped 0
  Q+ |) `4 T4 P! q& |$ `  set grid-x-inc world-width / grid-size-x, O: f% a' Z/ ^) X
  set grid-y-inc world-height / grid-size-y
: d( _& _+ Z7 y* d1 _+ {! d- k9 ^& t( X$ H4 x
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
3 L* a# Z4 o' s9 ~0 u8 M  set acceleration 0.099
5 e1 `. _- g  m  Z9 n3 Wend; S: R7 H% Z0 {( B# R& l

) \" W( {2 [" d2 D! X2 N; H;; Make the patches have appropriate colors, set up the roads and intersections agentsets," e9 ]& ~" i- W' H3 S/ L6 x
;; and initialize the traffic lights to one setting
) M1 V; w4 c% d" J' h$ C+ dto setup-patches
( `8 M" ?# o& ^% E$ {  ;; initialize the patch-owned variables and color the patches to a base-color
& L. Z5 M  M3 }* N. T! [5 }1 X+ d  v  ask patches4 X1 u/ _6 @, T0 A
  [
+ H8 P  B6 I2 h  K& I7 d/ F    set intersection? false
  R2 C: i1 |. ?, e; t8 [    set auto? false
) `) ?$ n6 x9 m2 I    set green-light-up? true
) x, S; C! ]5 c. d    set my-row -1
3 I- }5 E. G) Y* D/ X4 s* l1 P    set my-column -17 m% z+ ?0 z" k# h5 [" K' b! n
    set my-phase -1! [7 x, p0 {$ D: D5 `
    set pcolor brown + 3
5 j7 q" ^. H0 c6 u  ]
$ w  _: a: c5 b# G, M) b, ?9 B5 _) L' C' n- b3 r
  ;; initialize the global variables that hold patch agentsets9 _! l( b. T5 R3 S! U* X
  set roads patches with
( Y  x9 ~; Y  K    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
5 I1 E/ c. w4 F) L5 H; \' g3 t    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 u$ Z0 }7 q( I/ f+ q
  set intersections roads with: {1 e) t" P0 a! O! ^/ p1 J: J
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and1 T5 p& D& T! O" x
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]" K' S* V. ~! w1 I3 o" H3 W

; ~  n3 Z% r$ @- v3 r" [  ask roads [ set pcolor white ]
; M* Z' ]* t+ X" M    setup-intersections
4 m# O% B' m3 }/ E0 p% l7 f' R# D2 Kend6 V0 T- c" e8 n' W% A# e2 V
其中定义道路的句子,如下所示,是什么意思啊?& V) G. t8 H4 @1 J" F) w" Z, i
set roads patches with
: y5 W1 W( L8 K" }" Y: ]: x0 Z# D8 i  I  ?    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
7 E$ c* ~4 Q* s% k7 H  a    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]9 [! ?8 e) d6 W5 P; I
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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