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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。, @1 ?3 g+ c$ ^5 c* e
netlogo自带的social science--traffic grid这一例子当中,
. F$ w7 _& ?4 Y; E/ C& r% l, xglobals# c' t7 \4 y+ Y+ p: K# `8 ], o: V
[; @- H9 O/ M* X. T. _3 j
  grid-x-inc               ;; the amount of patches in between two roads in the x direction3 @2 V( T, Z9 d2 @! k' f
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
# o; j- o/ ]3 |* Q; \2 ]  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
: U1 t! M, V+ ^' {                           ;; it is to accelerate or decelerate# X: S( C0 v  l
  phase                    ;; keeps track of the phase
$ B/ w. ~, [0 h  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
9 f7 j4 G/ l7 O* ?7 M' G: `  current-light            ;; the currently selected light
* [  T3 g: I: E- Q1 }9 h
7 }8 f8 ^+ J7 H$ D; B- m9 M5 G  ;; patch agentsets$ _: w# D8 }: W0 z1 M7 I0 J) ?3 M) U
  intersections ;; agentset containing the patches that are intersections
- R) ^; o3 J. @) L( M( G9 \( U" W1 n  roads         ;; agentset containing the patches that are roads
7 Z- X' |6 w" a" A) d* o3 l" r3 e; n]: {* b( k, {% Y* S, g4 L
( b' N9 H5 H) C+ D  Z
turtles-own
5 ^$ k; C2 _7 R5 Q[6 C  a- N$ W: r- K9 j( f
  speed     ;; the speed of the turtle0 S9 j! k* J5 C7 y6 X* x
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right; V8 W; Z' ]3 ~) ]; p8 W0 R  Q
  wait-time ;; the amount of time since the last time a turtle has moved+ n  ], W7 a& T. G1 o
]
( H+ E  S  O7 l
  l2 f- _/ [6 c$ F3 @patches-own
4 P( Z5 {# k. W8 Y( z/ R[! |5 v4 R& q0 w! @+ f2 P6 y
  intersection?   ;; true if the patch is at the intersection of two roads
* M9 P2 O. U1 S3 Z  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.; Z/ p, A  k( w# y* {! h% A/ r
                  ;; false for a non-intersection patches.
9 P; R* `# K4 ]) `, h/ \! f  my-row          ;; the row of the intersection counting from the upper left corner of the
% G( B0 ^2 E2 s' M6 W! D; g+ O                  ;; world.  -1 for non-intersection patches.- d1 @) ^$ s/ L- r9 f4 {
  my-column       ;; the column of the intersection counting from the upper left corner of the
) h' |) `& O2 E- F                  ;; world.  -1 for non-intersection patches.: D9 [; r6 Q, n; `- J
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches." H  ]7 b+ R. v  R# m8 j' b
  auto?           ;; whether or not this intersection will switch automatically.9 F3 S) f# y  Q
                  ;; false for non-intersection patches.
1 R$ L& Y" E0 t/ h$ F7 c  d]+ V8 |  G) K- G8 J* e% b0 D

) E& `, L( p: `/ t, f# p5 d
3 P. s# ?7 ~1 k7 j4 n;;;;;;;;;;;;;;;;;;;;;;5 ?- w' T/ n3 K3 N& A/ e  t( \, ]
;; Setup Procedures ;;
+ I' R# I9 K3 O# m;;;;;;;;;;;;;;;;;;;;;;% A: E1 i" ], D: J

! B& |) Q8 O& O( J2 M  E;; Initialize the display by giving the global and patch variables initial values.
8 j7 V3 `' y; Z: q. P+ i$ W;; Create num-cars of turtles if there are enough road patches for one turtle to
, Z, S. T) c* c;; be created per road patch. Set up the plots.
- p) c. z4 D* d& i7 Y$ D2 ?& zto setup
- Q; H" i! F: ?; U. \* B1 \2 s  ca
' H6 L5 v" E0 ?9 X0 k& P  setup-globals
) H! b* Z+ U  B, z* B0 C( p2 m! G+ j7 N5 b- C! D
  ;; First we ask the patches to draw themselves and set up a few variables
: X  a2 E  Y- M  s1 K  setup-patches2 G& q; P" F* y3 {9 f
  make-current one-of intersections
" e! s% \9 l/ `/ P* i0 x  label-current/ x/ I2 \/ \8 e; l6 W
; N/ s+ |5 ]% [
  set-default-shape turtles "car"( Q+ Y! O; m8 s, \- J- R6 Y; p- j
' w3 L/ p- ^0 b5 Z* B
  if (num-cars > count roads)
9 s( e$ k& A% A7 R1 F0 }  [
: m  c+ t0 f! ]% m! O8 Z) a    user-message (word "There are too many cars for the amount of "  t( b7 o6 T9 @
                       "road.  Either increase the amount of roads "0 g7 [! f6 R0 i  g. z
                       "by increasing the GRID-SIZE-X or "
) S/ A8 @' ]8 N3 C                       "GRID-SIZE-Y sliders, or decrease the "9 c, M9 `7 d% X: Q3 l( }* Q. R
                       "number of cars by lowering the NUMBER slider.\n"
* G; [& \2 O3 G1 ]& I3 L) _                       "The setup has stopped.")- F5 J3 }0 u' T" k4 k' N2 r9 \
    stop# @  I* ]; P; _5 P1 D
  ]
. Y$ D2 S7 V3 F. K, x3 h0 j* `9 D; N* |( s: a# V( W6 u& F
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
& f6 h  ?2 ?) Z, U  crt num-cars
) @, O- N3 |; E: p1 v6 t  [
' k% s1 ]. |: I; W    setup-cars
6 D9 R0 Q0 X1 T7 S    set-car-color( t, e9 Y4 x. y
    record-data: s, C7 I6 F7 B: @5 N  {
  ]' [: }. {  |; V) t* H) }( V
; i. ?5 s9 R* K/ f
  ;; give the turtles an initial speed
( A6 n( {+ Z) g" y  ask turtles [ set-car-speed ]
/ b0 H6 |4 W% H- P" ]: ?+ S0 t
7 g3 F" N$ ]/ P5 u- z8 U+ }  reset-ticks) M' ?2 Q" ^# e6 ^% v! [3 K0 @
end
) \/ U5 `( f2 W: e4 ^) n4 L4 @. B0 s
0 s2 K4 m5 n; l& V4 V;; Initialize the global variables to appropriate values, R3 B; g2 S0 S) C* j* ]  C3 `
to setup-globals
+ N- X' c5 ?7 o& L( h2 f  set current-light nobody ;; just for now, since there are no lights yet2 v0 _% r5 L( c7 x1 J' B
  set phase 0, n' s0 n( F( A) J! [) h
  set num-cars-stopped 0  a7 I0 D  }+ Y# B( ^2 q2 @
  set grid-x-inc world-width / grid-size-x$ m  k3 X- O' z) z  f* S- M
  set grid-y-inc world-height / grid-size-y
! M# ~& Z3 p* W* R. g; f" I* E" {1 @% s7 _/ G% s
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary. I# z4 z# l0 ^' ~3 }7 J
  set acceleration 0.099: m6 U+ `2 b6 D$ D
end# g- ~* b' ~/ E5 k

9 X9 x8 H3 l# g+ v6 k( E, T;; Make the patches have appropriate colors, set up the roads and intersections agentsets,/ ^& g1 P/ o1 o) E- N2 ^3 m5 M
;; and initialize the traffic lights to one setting, Z; X- C! \( y; w9 ?5 Q
to setup-patches
( I, A5 O% e6 U  Q  ;; initialize the patch-owned variables and color the patches to a base-color+ e- B" d% B( Y4 T4 t% H2 g+ x
  ask patches
3 G5 g/ h$ ^. m$ f7 g4 x! V8 |" }2 i  [
, h! H, M1 ^" B: Y" W    set intersection? false5 {8 ?+ I/ H8 B0 V# _
    set auto? false
+ K: A- b) q& O- ]6 G0 \- v2 f1 [    set green-light-up? true
1 f8 ~+ q* p3 B6 D0 {  K    set my-row -1
9 O) z1 J9 \( E) j( N# P7 r    set my-column -1
: c3 E* \  c9 i( _6 M! H/ @8 V    set my-phase -1
. B8 i4 l) f) Y  B- Q    set pcolor brown + 3
3 q3 h9 f6 ?- y- m  ]
* ], [4 B6 m4 k% w" R' r
' C2 e% y6 J( R' ~: _  ;; initialize the global variables that hold patch agentsets
+ V% }7 {& T% K7 u  set roads patches with
) v6 z! `) h& S5 L2 E2 A& p* g    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or4 R9 _7 t: q) S
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
+ s3 M& F' {* M# u0 n0 j' z$ w  set intersections roads with
8 W0 s% v/ y/ B0 d* y8 c; O    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and6 r4 O, R7 d2 K
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
( X) U6 |0 V6 M1 z2 h
! @9 ~, o! t; M2 S  ask roads [ set pcolor white ]
3 ?$ h  A3 }0 d. o, k. G+ L5 A, x    setup-intersections& a% s5 T, ]5 W: `! X
end
. w4 _) H4 I/ y; }  C$ p. w其中定义道路的句子,如下所示,是什么意思啊?3 i# b' M. {' l) M# P8 N
set roads patches with+ j, p: b* t) E- J8 T( A
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or$ e4 {5 K' P+ g; e
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]2 a+ c8 P7 F5 Z" G8 S/ v& K1 j
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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