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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。: q1 f4 N8 `3 K
netlogo自带的social science--traffic grid这一例子当中,- X, l, j7 P9 t) T5 z
globals
% }3 Z& S& h$ {% y$ J[
( u; a" u8 v0 n( |$ ]# |# z  grid-x-inc               ;; the amount of patches in between two roads in the x direction& P4 M$ \0 V8 G" I5 b
  grid-y-inc               ;; the amount of patches in between two roads in the y direction  C- Y' r0 k' i# V% r8 y, B% b
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
8 F8 E, R. _0 W( D1 w                           ;; it is to accelerate or decelerate
! k% I: ^, ~0 U% K% D  phase                    ;; keeps track of the phase
- _9 U& K7 A; }6 C9 {# A) ^, i' @  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure+ Z- Y1 i) ?" S( v. w
  current-light            ;; the currently selected light' V, ~6 _, X% n$ n' f5 W
. E2 z' y/ s4 o$ a
  ;; patch agentsets
  E4 ^" e3 D, g3 |: k% d! f  intersections ;; agentset containing the patches that are intersections- d6 s8 h& c3 i6 i* O: c& e% o' C
  roads         ;; agentset containing the patches that are roads
4 L; y( Y) G+ P1 y/ q]; z$ W, t, l6 F6 H8 o- n
- b8 P, y, I5 b: J9 d  H0 O# W
turtles-own0 C8 i. r7 k2 f& Y/ ~
[
& c3 I7 R' @6 ?2 E- C7 ^* x: w, u  speed     ;; the speed of the turtle
& n5 X) I! r" k1 L: Z  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
- s- B3 @* J6 C% f( P2 F2 W# r  wait-time ;; the amount of time since the last time a turtle has moved) l* E, }  ^! Q
]. f2 Q/ ]$ ]# ~/ x2 o' g

7 [5 Y- v$ w4 r8 y# K" M7 R: d2 H( wpatches-own
- j6 k5 Z- c, t- A$ `% L7 C[; \- y: e% r+ J6 y& f% T
  intersection?   ;; true if the patch is at the intersection of two roads# H  v/ D! I0 ^- H8 a# j
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
/ g: n4 ], T; F. q+ x  v                  ;; false for a non-intersection patches.# i* t5 q) s! I
  my-row          ;; the row of the intersection counting from the upper left corner of the/ B" k( B4 ~% D% F$ B, ]
                  ;; world.  -1 for non-intersection patches.
% Y$ i/ r& a$ i) @' W: I  my-column       ;; the column of the intersection counting from the upper left corner of the* C3 x, h# e2 d- {- v1 |
                  ;; world.  -1 for non-intersection patches.
# r6 y2 V( [' B# S& ~0 V& T2 i  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
% h2 M2 p# _1 ]$ Y3 r5 N# O  auto?           ;; whether or not this intersection will switch automatically.6 }0 e6 R# G* b# E% }% Z
                  ;; false for non-intersection patches.
9 }, A% y8 s6 R, q5 C  I7 u  m]
( f. N- d! x  R# _$ y1 a$ ]/ I4 M' Z4 \2 T, R9 l/ r

' T4 p( f7 |% U5 v;;;;;;;;;;;;;;;;;;;;;;- A( C; A6 _3 v; ?
;; Setup Procedures ;;  U+ ?  F4 Z. D8 w0 s
;;;;;;;;;;;;;;;;;;;;;;
  ~" ?4 `1 W) M' L4 C$ N; M
  w; d  X) E; x5 A8 u;; Initialize the display by giving the global and patch variables initial values.) z; [) @- M: `8 @2 m# N
;; Create num-cars of turtles if there are enough road patches for one turtle to
" D4 t; |: e9 w# ^;; be created per road patch. Set up the plots.
  e5 L) L( V1 {to setup
6 B( c' }* Z, Z# }1 A  ca
. @2 f) I1 E9 f1 a  setup-globals! D! \7 S2 F0 a0 i2 C* L( p* Z

+ J1 e+ ?+ Y8 ~4 L- c( A7 w* ^/ y  ;; First we ask the patches to draw themselves and set up a few variables5 U) c7 B( G; s2 r. b( Z( h! t
  setup-patches: r$ x; M' x% c4 g& e7 H
  make-current one-of intersections
3 \3 S9 P6 X! U7 q3 J  label-current
% r) [2 i9 |: @0 `! b$ c- S$ B6 O7 u; C; e: w: g) N' E
  set-default-shape turtles "car"
: V) I7 p  m) C# D
: z7 I& D  t4 ^! J8 k  if (num-cars > count roads)
  Q5 M3 `" @9 }* F  [4 r/ [% |' Z+ ?% l3 y0 p: ?5 P
    user-message (word "There are too many cars for the amount of "
+ H) r" x2 d9 X" E' A4 ^                       "road.  Either increase the amount of roads "" G. L! X! t. x" m  T1 j5 r# a) S! u
                       "by increasing the GRID-SIZE-X or "
/ ?2 K5 {* L# h; c0 h" I; H# ]                       "GRID-SIZE-Y sliders, or decrease the ") y% j/ M7 ~7 e. h1 n
                       "number of cars by lowering the NUMBER slider.\n"
" J" D. a' D8 v! I% f1 }, [8 b/ p                       "The setup has stopped.")
0 a$ Q9 d: X3 l6 J  e    stop
' {$ d8 a- {: o$ z5 q$ n5 C, `+ I  ]6 n7 r$ t, B, J* l3 t8 I7 h( \3 Y
9 ~& p$ J% [& n1 t+ O3 H
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
6 O0 J& W' f2 d, r4 N  crt num-cars( Z8 m0 ]" H: F; ]
  [2 J4 f4 H9 A7 X# q1 u' t4 z) \
    setup-cars
' V. E/ m! B' S6 s) E    set-car-color
8 q8 a. u" Q7 X( G6 f* C    record-data
6 a: ~$ F3 ~0 p. Y/ V' e/ }3 \7 M  ]4 x8 w6 e+ X9 o' r- K  F

5 j# q1 `4 X7 |" M9 L* K+ V  ;; give the turtles an initial speed' e4 {% R' X1 W! X0 P' [
  ask turtles [ set-car-speed ]
6 G' M4 j+ S& k$ ~' b: `; W1 g6 _# {. s: [3 U0 w- R
  reset-ticks
% m$ g- y& }6 s9 {1 |2 K: Nend3 g) T8 ^$ r3 h" g$ n* |
% U# O% b2 |' ~% O
;; Initialize the global variables to appropriate values
. S8 r, _6 o0 T6 z8 Pto setup-globals
8 j: ~6 Z( I. f+ W% N  set current-light nobody ;; just for now, since there are no lights yet
0 Y# b7 V6 \- G9 t1 ?' `  set phase 00 J4 {& I% O: t
  set num-cars-stopped 0
$ G. D, ?6 ~0 H! C* ^% K  set grid-x-inc world-width / grid-size-x
0 S$ H! c& X6 Q! T2 i6 U" \  set grid-y-inc world-height / grid-size-y6 K5 @( B5 C4 N7 Q$ Y  G
# W1 Y( d5 a5 g2 m7 \! E+ _
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary/ \3 M* i5 ~5 q( {7 v. a# k
  set acceleration 0.099
9 l! L  N" t+ [- K. |5 {' vend
/ d, b& G5 ^& W3 R. M
9 i4 ^& \7 v9 f+ I" Y! u;; Make the patches have appropriate colors, set up the roads and intersections agentsets,2 T  i: [7 T. P: c
;; and initialize the traffic lights to one setting
# A+ F4 X; l1 w. D3 ]to setup-patches" |4 c; H/ ^+ b2 D! ^, K
  ;; initialize the patch-owned variables and color the patches to a base-color( \0 `) t: H4 V( g5 N
  ask patches
* h3 S' d) u, F' l  [) @# A' V% O7 o; k
    set intersection? false- l3 b! N- u  w4 [
    set auto? false
( H- B8 G! ?2 W: [+ {4 c1 |    set green-light-up? true
2 T# J( {$ L6 U) h. E    set my-row -1
4 S% B% u' I0 x( ?. F; t( K! o6 v    set my-column -1# h. P% R* h* e; R. f
    set my-phase -1
  Y2 x4 [( S' v0 c    set pcolor brown + 3! F* H2 L, ~* j  C
  ]
9 ?. P+ j2 o% l- V" `  l+ u, M' i1 y
  ;; initialize the global variables that hold patch agentsets" x- Z( i9 f$ m3 e& t- W- n: O5 K7 [2 U
  set roads patches with+ b$ }; @( ^- p2 ?( S  w
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or/ m  I( y# O/ U2 o3 i
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
% ^- _& L, G$ \+ l" ~  set intersections roads with3 x1 ~1 m6 w* n7 w
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
& c7 W. n& ^  O    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]& R4 A- G1 O$ A

. {" O% J' A  h- X  ask roads [ set pcolor white ]6 W2 h$ N6 z$ U& C
    setup-intersections
9 X) \8 `6 l6 Y) E6 W& u* Send
( k; |1 n4 }& ?% u* D9 }* ~1 A; V. d其中定义道路的句子,如下所示,是什么意思啊?
/ k0 A; i/ L/ S, X  ] set roads patches with
6 F! q* d6 |# d/ E    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
% _. @! b. k3 B) n$ T    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
: H/ T+ \/ x9 i3 m/ N; Z+ r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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