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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。
3 F0 M! G$ u3 S5 p+ Q8 f* ynetlogo自带的social science--traffic grid这一例子当中,$ I. O8 f2 \! W( F/ A# P3 ^
globals% x1 G- A. A8 j& L( O+ D/ M- }
[- @. F; r  W( O, {+ b  l% f: q# L
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
6 t5 f2 u9 w8 v. w; @/ U  m  grid-y-inc               ;; the amount of patches in between two roads in the y direction7 O" I9 \( Z% W$ P, b% U. o
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if9 ~4 M, j. y' i4 C5 d9 K
                           ;; it is to accelerate or decelerate
5 e8 F, t6 |& T9 q6 ?# D  phase                    ;; keeps track of the phase
* @  \  ~, x! y/ j8 o, i# v  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure+ P! d4 u) |2 ~& U* a
  current-light            ;; the currently selected light
& m6 r9 D: h% }. r/ K
4 h4 _3 |# I# I5 ?" x+ Q2 Q  ;; patch agentsets8 z8 z5 i- ]$ A, m; w; D% b7 X; m
  intersections ;; agentset containing the patches that are intersections$ X, w' a: t( M5 b. U+ V. o
  roads         ;; agentset containing the patches that are roads- G: ~0 H$ M$ q! r: q; h/ e
]/ Q7 @+ `+ ]  ]5 \9 `+ C9 L

- r  H! F; [" u- ^. v+ a5 oturtles-own
% B9 S- [9 d4 k[
* Y. j( A+ N) O5 y2 U3 z( C0 y* ^  speed     ;; the speed of the turtle$ D6 t! D! N2 [) x4 j# s  t
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right4 R/ l* U9 ?/ b" k
  wait-time ;; the amount of time since the last time a turtle has moved( |+ W% K9 O" J% f2 [' r! s! v
]4 s0 o4 h6 Y) S- d" Y% g

6 J- J& y& i; l% R# L, hpatches-own
0 n+ B2 n" Y/ P9 u+ A3 S0 ?[) W( \8 s; H. W6 _0 `/ c* F! F0 a# W
  intersection?   ;; true if the patch is at the intersection of two roads9 ~: B( N6 B6 {( z9 x
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
8 }9 r3 ]' q$ h  w) d5 G4 \                  ;; false for a non-intersection patches.
& K9 G6 |, b% U' z6 w" \  my-row          ;; the row of the intersection counting from the upper left corner of the2 k! F  \8 ^2 F  s* u- @
                  ;; world.  -1 for non-intersection patches.9 ^0 B2 j. {/ e
  my-column       ;; the column of the intersection counting from the upper left corner of the
) s. v: Q, `: w  J( h  V) A                  ;; world.  -1 for non-intersection patches.. K, g- d2 a4 h$ Z9 `9 h0 \
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.0 X) O9 u; j0 @, E
  auto?           ;; whether or not this intersection will switch automatically.7 |6 s  U5 r* p: p! b: @* G
                  ;; false for non-intersection patches.
* M2 z' B3 b* u+ p]
* j( R5 I; k5 r! |4 v7 r/ `1 L7 E; |" H
) T* @; L  @) f5 O6 L
;;;;;;;;;;;;;;;;;;;;;;1 e/ q4 }3 n1 z
;; Setup Procedures ;;
: q$ S8 W+ `3 L1 H2 E- A/ M0 S;;;;;;;;;;;;;;;;;;;;;;5 N' t0 u: u0 q. ]

' B5 Y8 _  @% I2 @;; Initialize the display by giving the global and patch variables initial values./ Q9 ?$ r2 E; `. M1 d8 d% ^
;; Create num-cars of turtles if there are enough road patches for one turtle to5 B5 H" R6 O  ?0 `
;; be created per road patch. Set up the plots., R7 u7 `, h. g% X8 i
to setup1 j/ _4 `$ ^% }( @6 n/ ~; F6 l6 e
  ca# w7 P  E; o* Q4 w+ w$ |% W) R8 F
  setup-globals
" \" S4 w" L2 A( n! u4 ^+ a9 Z" z( [$ t2 I7 R- V# |7 o5 m
  ;; First we ask the patches to draw themselves and set up a few variables
: j6 a+ k+ Y- F, a" @6 d; p  setup-patches
9 ]% f( W3 V* n+ M, r6 e5 C  make-current one-of intersections
+ U' h1 B& S% z; q  c  label-current
( e; U$ N/ z9 J3 U/ L' L
. N9 d/ ~5 W, Y! n  set-default-shape turtles "car"
' X' E% y, B) d  E- ?
, N5 S1 q  W/ ^6 }) f9 j  if (num-cars > count roads)5 x, ^$ x# C8 v4 G. w7 l
  [
' A3 `& }) Q6 a# R2 v3 [& q  ]    user-message (word "There are too many cars for the amount of "4 F8 J& Q4 ^4 P( M9 u' J2 ?4 Z& I
                       "road.  Either increase the amount of roads "; N' c0 B  D# u8 i8 y( W- y
                       "by increasing the GRID-SIZE-X or "2 [. a9 P3 i; ?$ i, X: Z
                       "GRID-SIZE-Y sliders, or decrease the "
7 O' O) A% E. i  i8 W  k                       "number of cars by lowering the NUMBER slider.\n"1 v) q) O0 [6 u) ?0 v2 s% f6 I7 O
                       "The setup has stopped.")
3 f/ c4 G# e0 J2 Z  e    stop
% G* D, v& r  i. y7 o8 v  ]. t. a% V! \& h/ D# A, p+ e4 n# B2 n
% K* N! F4 ?( ]: j; l! N
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
' S8 d7 Z5 i' p6 k! \; ^  crt num-cars; d- f& ]; B+ m; x6 Q$ ?) E" F
  [) [4 p2 P6 k5 O5 m
    setup-cars
& ]  n5 @4 r: u5 t2 \3 X    set-car-color
1 w7 A- U' h: T0 f3 e    record-data1 G6 G: g) C4 `7 ^- s) u" E& p
  ]
; F+ n( F" L: Z% O7 G9 Z, c9 P
1 W/ U* e7 `. a+ B  ;; give the turtles an initial speed* A( l7 v8 t2 M$ m' K: e1 b
  ask turtles [ set-car-speed ]
9 V8 z" s9 H1 ?6 a8 {* f# u/ L! b9 U9 o& f' J% _' e
  reset-ticks
0 g, s  q/ P* q  Iend3 w/ a3 W: q5 k9 [- A  ]

. j0 M- p) b2 i# @4 y- p;; Initialize the global variables to appropriate values
& |4 e8 W1 y6 c  _! i& w4 N0 ito setup-globals% R1 C. ?! |- x+ i% N/ L
  set current-light nobody ;; just for now, since there are no lights yet
+ r; W' L; x) k+ h  set phase 0. S& L2 [( _4 X0 V  K/ P: Z* H, o7 v: q
  set num-cars-stopped 0
# U. V- i- Q1 D+ P. I- c# k/ X5 ]  set grid-x-inc world-width / grid-size-x9 e% C: h0 n( b" X8 ^8 _( A* ~+ I7 l
  set grid-y-inc world-height / grid-size-y
# c* ?% j0 y# b2 N" {$ a: u8 I
: q- b% _- u& j) _) t6 q0 O  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
& u5 D0 y" b, b$ M* h7 g( u) j' q  set acceleration 0.099
2 q: p  a5 G3 Y' P: [7 h$ R+ Xend
+ {  l1 T/ w' p, E6 F* z. g* p7 T; K1 _) R+ J
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
$ f' i9 C' y5 z9 r( t- y! ?2 b;; and initialize the traffic lights to one setting
/ `# r5 e- V) H7 S0 Dto setup-patches8 Y8 r5 Z3 r* I% ?: @. m7 f: `
  ;; initialize the patch-owned variables and color the patches to a base-color
* Q$ D4 a  a! d+ N  ask patches
& x: m; Z  x8 L9 G9 K6 [2 {, j0 w  [" C8 v+ Y: j, t) R
    set intersection? false
. x+ b- s  L$ d+ m7 O/ p$ B; K0 _, n    set auto? false- y0 U* V/ E! O) {1 l5 j
    set green-light-up? true
$ q8 M# c; i4 I" {    set my-row -1+ @5 h; o0 q! e
    set my-column -1
# j2 m! l' c) P6 Y+ @9 F    set my-phase -1
8 l: J* w4 {: X3 m    set pcolor brown + 3
) G( W: X* F6 d  c% g  ]( _1 ], s% A' V, k. p8 O- T
* l4 F2 p! o2 Y; {4 r
  ;; initialize the global variables that hold patch agentsets
, K# j8 W/ L. {: l; y+ }  set roads patches with4 m. S2 F5 \5 g, [9 t; U
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or* ^) X+ W& L# J- n: t
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]. q5 J* `  n8 k1 E0 |! H
  set intersections roads with- l- f2 o/ i4 `: `7 P/ T
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
4 `$ n# u* P6 P8 ~& m# ], D    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
+ u0 o4 f& ?/ |, t2 G9 N% L
$ Y8 Q, L& q) P% o0 {* `; m  ask roads [ set pcolor white ]- C2 e3 W, d' u& o
    setup-intersections# N1 e2 _+ _  m3 Z* n2 |9 k  h
end
2 \4 E0 z/ I! h# r6 c$ v3 c6 A% Y其中定义道路的句子,如下所示,是什么意思啊?) L, S: b& p1 e
set roads patches with
( N( H) l+ `( a" h2 X+ W2 G    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or+ E/ e: K- v  y! C2 V1 C' I; |; M
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
: `$ f( U) j. }' n( M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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