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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。' n0 A# V5 q) {
netlogo自带的social science--traffic grid这一例子当中,
5 e; q% u5 t, Z+ uglobals
6 m8 Z1 A; J+ ]5 K: c[
" G5 X0 z9 J" L: A/ W  grid-x-inc               ;; the amount of patches in between two roads in the x direction' T! U( Y) D8 V- u: Y: {
  grid-y-inc               ;; the amount of patches in between two roads in the y direction9 v/ v7 g* \% ^: S* z$ O3 s% O7 P( Z
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if: ~6 Y" Z6 g6 r0 L+ |+ E
                           ;; it is to accelerate or decelerate
% k0 U1 m% i3 ~' ~  phase                    ;; keeps track of the phase0 w/ C6 U+ @* N, c+ \, E
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
1 ^( u: k( t' Y3 \9 Z  current-light            ;; the currently selected light
0 }2 t- P: x! k) m/ ~, @, f* X' ]- }# m
  ;; patch agentsets
: L0 c- E1 z4 L/ ]  intersections ;; agentset containing the patches that are intersections  e5 F/ B* B5 V
  roads         ;; agentset containing the patches that are roads1 s3 X$ _/ \! a$ g5 {: n
]
4 U' F* |9 E5 V. R+ S
: [# j, `. M5 Y: U. x- sturtles-own
7 o8 p- p" n, \3 B3 ~& a[0 |/ R0 `) t, s2 @
  speed     ;; the speed of the turtle' g% _; l; ?' i" T
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right* U8 _; {7 M% ^" u5 c- Z
  wait-time ;; the amount of time since the last time a turtle has moved
- O) d* s( ?+ u9 Q9 H], ?6 d+ S- T, t7 v# `% c# J1 ~

5 n# R1 I  k2 ]2 ~! r: s% Spatches-own
9 C& S! n/ U) ?. R+ O' {5 @[
0 x1 |, C' e. j8 }1 N. A" k  intersection?   ;; true if the patch is at the intersection of two roads$ _. C9 ~9 {8 f1 j( O1 w
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
' c$ {& L& f* |: z5 Q# T, [1 |                  ;; false for a non-intersection patches.
$ y% U" q' T& B& K0 v& _' ^  my-row          ;; the row of the intersection counting from the upper left corner of the
+ u% y* G$ N1 c                  ;; world.  -1 for non-intersection patches.; y! ?1 D- p5 m9 ?
  my-column       ;; the column of the intersection counting from the upper left corner of the
4 l5 _9 H6 x0 ~/ b                  ;; world.  -1 for non-intersection patches.
2 s7 M- C, ?6 L  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.( i) f: f" O/ w$ {1 u7 k  _
  auto?           ;; whether or not this intersection will switch automatically.4 X' r* r( N1 `; k" p+ K
                  ;; false for non-intersection patches.% f3 d. I) {! ], e2 x
]
: O( |/ U9 S5 q% s1 m
0 p% O- a3 H2 s; J, b3 b. a; @& c5 z1 G, S# ]1 ]1 ~) m
;;;;;;;;;;;;;;;;;;;;;;# f& I# s  [& ]# a. }* H$ Y
;; Setup Procedures ;;; y- W0 y$ |2 t
;;;;;;;;;;;;;;;;;;;;;;4 P- u0 V1 G1 r) R, H
; f6 T! G% z; Z; ?+ x4 |
;; Initialize the display by giving the global and patch variables initial values.1 ]' n' T: A* d; ~1 f
;; Create num-cars of turtles if there are enough road patches for one turtle to  B4 d7 z6 T3 A9 S9 W/ M) h. w) w
;; be created per road patch. Set up the plots.- C: w: N* d! Y2 o0 B8 L
to setup- \( s% w! q; U" r
  ca
  q; T* [: a4 B  setup-globals
- A2 P- D- g& S/ a
* I  x  i. m% Q: d& I( G9 w5 i  ;; First we ask the patches to draw themselves and set up a few variables
$ h+ A9 Y2 i7 r5 l! _$ c$ r$ r, r  setup-patches/ k) l3 q( N0 J6 ~5 D) K3 P1 R) E
  make-current one-of intersections
( S, e$ y8 |" Y3 t' O0 ^9 K& d  label-current
4 L% D# U  L4 ^3 A( W% ?. e3 F; ~  q) n3 N4 X" U4 k' f1 v- y5 t
  set-default-shape turtles "car": d2 B; I% w3 D# u; c! O, ^
3 s8 Y' S! T+ |, `2 a
  if (num-cars > count roads)
- o+ z1 @# ?0 x8 E! K6 b7 Y3 `, U  [
4 m/ B. V0 ~! c    user-message (word "There are too many cars for the amount of "! t) C# ?* c6 s0 R7 @
                       "road.  Either increase the amount of roads "
" l  O+ C/ z1 u- U# o4 e                       "by increasing the GRID-SIZE-X or "3 V9 _4 |( d2 n2 Z5 ~4 r6 o, m3 U
                       "GRID-SIZE-Y sliders, or decrease the ") o) S- C9 {( ^
                       "number of cars by lowering the NUMBER slider.\n"
$ e* z2 d1 t7 `  ]; O3 O                       "The setup has stopped.")5 o  i4 K. s; {
    stop3 B  b  q4 P( P7 [1 \9 v
  ]
! {# U+ O  B: I& o, z, X3 o. A! |+ k: O  v% S
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
+ f# r" J/ m, I6 {% n. P" b, _4 r  crt num-cars
# h. t& v" U8 [/ K% J/ L  [
+ H: C9 ~8 i+ O    setup-cars9 N. q3 u7 M. O" B7 n6 F
    set-car-color
  y0 s' @% v3 [1 @    record-data
6 @9 Y1 F4 D! M* Q1 v/ @# U; o  ]
: {" v/ _3 D4 R' D3 h1 Z# i, {: i
3 h* d; Z4 E" f! b4 r+ r( G' z6 T2 G  ;; give the turtles an initial speed9 }+ x5 [0 z! C7 E9 _; T! |6 ]( x
  ask turtles [ set-car-speed ]$ f+ ^1 ?& o- m4 Y3 T. n( ?0 }
1 j/ r& T; e% O* m
  reset-ticks) V) P1 E7 q9 |. E2 n% S: z
end4 S3 R4 I  a) `( j2 q& d0 m, @9 C6 D
+ R  i6 R7 J/ T7 o
;; Initialize the global variables to appropriate values
& _3 u3 e# p! l. ]- P8 S, G( mto setup-globals
' K- j  a* L. N" T& c& A  set current-light nobody ;; just for now, since there are no lights yet3 d  B( P( W& U1 p& e+ t8 d: }( @
  set phase 01 `4 I! h- a0 ]: t$ ]$ I2 ]
  set num-cars-stopped 0
. c3 q6 j- `* {( ?% D5 F( C  set grid-x-inc world-width / grid-size-x
& b- K7 T, Y3 w5 X+ k7 ?  set grid-y-inc world-height / grid-size-y% U3 F7 T7 r5 D7 j

; s8 Z! O2 W$ A5 Y! K  z  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary0 U7 {9 ^$ S0 K& W' K
  set acceleration 0.099
. B- R* w- m' i4 _: X6 b+ Rend4 ^/ O+ E3 I5 _  ^% |+ e
0 f) @& @, k& ^5 o! C3 i% w
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
/ y, i9 C6 ^( R0 ?; b/ E5 };; and initialize the traffic lights to one setting
; l( x; i7 U' N& [0 B0 @! s2 ^to setup-patches
; Y. U1 E+ k0 u, ?' A( \  ;; initialize the patch-owned variables and color the patches to a base-color
( w' y( ^* L+ d. P+ V; [  ask patches
$ _% S( m" g% |1 Q) K  [$ S+ \& B1 C, R4 _. K6 \' K$ p
    set intersection? false
2 n/ Y# h0 T6 }" j* K    set auto? false
6 d2 D/ G) T! e) J+ T0 s+ W( M3 U    set green-light-up? true: t; o3 P" b& C8 U5 z  ^3 T
    set my-row -1# H! q; a' Y& e* s) R
    set my-column -1
, K( V/ _5 {0 P0 I7 ~    set my-phase -17 A$ G2 A& S+ U$ T5 e: o  i) D3 }
    set pcolor brown + 3& @5 B1 P7 y3 S$ q9 ^
  ]& i' D. X( J( @, h* c
; Q6 Y4 ~; a" Q  ?/ n
  ;; initialize the global variables that hold patch agentsets
  @1 i) m" q" @) g2 V- t  set roads patches with
$ S+ y: m. [/ D9 `+ {$ m- u! q    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
+ K; i3 k6 M' P% @    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
- t$ {+ x- o8 z* {' R  set intersections roads with, n+ a) h  u2 e
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
! q9 l$ ^+ S$ @    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]+ j# K) y% p5 j4 N, E) s
* p- a6 C3 _6 I  a2 V
  ask roads [ set pcolor white ]* C: r6 J4 P! A$ s0 y; I9 t  t; Z
    setup-intersections( `% F, l+ c8 _
end
  x0 Q2 \2 q, s4 a: G其中定义道路的句子,如下所示,是什么意思啊?& O3 q/ z, {0 U7 @1 \9 D/ p
set roads patches with
# H' q0 C- `( M: c" I; \5 T    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or- p' k. N: f9 m" x! q1 h
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
; l% B$ q3 K8 W' j5 ]4 `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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