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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。
7 J: b8 Q# ^: e( ?netlogo自带的social science--traffic grid这一例子当中,9 {$ A7 _4 v3 \! W8 |- C. P
globals
9 G) C' K/ z0 i% M[5 W- P* b8 _# A2 y. ~+ G
  grid-x-inc               ;; the amount of patches in between two roads in the x direction# q9 t1 t% W' Z0 I% a+ [
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
0 _, _+ @, ~5 I: u6 m6 @5 H  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
0 S) K. K, J* W" K+ p                           ;; it is to accelerate or decelerate8 {) J- |0 ?: y! J9 g4 v2 ~
  phase                    ;; keeps track of the phase
0 M$ f' w+ R! |7 q3 Z6 K( r- L. t  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure8 ^( v/ J2 C( ~1 W8 o
  current-light            ;; the currently selected light
( h+ D. e) k5 M6 |/ d" l4 V  b7 [8 n  P* P- x2 M
  ;; patch agentsets
5 Q) A+ r( D7 s! B4 i  intersections ;; agentset containing the patches that are intersections
8 d' \. e! x8 f5 B) _% u6 B  roads         ;; agentset containing the patches that are roads: ^$ J4 }5 `; V
]# D( W9 n4 E, Z9 c# H! Z

$ d8 ?  ]  U9 s. Rturtles-own  N  o. p8 @* s; p( T# ?* C; \
[
( D( U, ^9 W/ y; a8 h" v2 w- P  speed     ;; the speed of the turtle. v6 n) ]3 c: R
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
* Y5 E9 D3 ^4 @* j* S6 M) t  wait-time ;; the amount of time since the last time a turtle has moved% b7 w7 N% d9 j6 k, y
]# l+ Z; C$ r6 _! K# k
. v8 v3 ?  f, Z  U' H' C
patches-own
3 F6 W' ^. p8 c  y[/ v) Q0 h8 x0 `4 r% _3 N
  intersection?   ;; true if the patch is at the intersection of two roads
7 S* V6 B7 k4 L$ Y  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.- [6 d9 I' W: Y3 Z
                  ;; false for a non-intersection patches.
' x( O# d% @7 D9 |6 a  my-row          ;; the row of the intersection counting from the upper left corner of the
, _" {% A8 H2 y3 i2 R8 f                  ;; world.  -1 for non-intersection patches.
) I5 ^' _' I2 t$ t7 R  my-column       ;; the column of the intersection counting from the upper left corner of the4 a& w( z" b4 K
                  ;; world.  -1 for non-intersection patches.1 ^+ ]0 \8 ~0 s
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
) ]5 M$ |2 f2 Y2 j# X8 _' Q, ^! Z8 D  auto?           ;; whether or not this intersection will switch automatically.' F# t+ Y% C, K' ^$ Y8 ^" r
                  ;; false for non-intersection patches.
! k4 @& N5 N4 V, O$ p- X]
6 J2 |2 _) U( A# j$ R. L  A1 d% c( _) P: b- Y8 V* z( B/ {

! Z; }- ^8 }% k4 Q) |4 x;;;;;;;;;;;;;;;;;;;;;;4 s+ {! ^& V" P% C) ]
;; Setup Procedures ;;8 p9 w; v8 b/ i. c. `; y
;;;;;;;;;;;;;;;;;;;;;;
4 y7 P, f. D" o. m( C6 r4 z% T
, n1 z7 {% E7 R9 z  B" U;; Initialize the display by giving the global and patch variables initial values.
! y8 u' t' E/ m3 x5 N;; Create num-cars of turtles if there are enough road patches for one turtle to
  S" a$ b. T4 T) q9 G9 A+ O' F;; be created per road patch. Set up the plots.
! `" k- R' D$ ^  Sto setup( [! h# R9 G) k: P
  ca
1 C* M1 ]- ~! E% _9 Q  setup-globals
4 O' S. b( o% c: n8 A
) K) o; I4 Q: M  E; W/ D! N  ;; First we ask the patches to draw themselves and set up a few variables
# R; ~2 e: A6 q7 S  w  setup-patches, ]) N! F( m4 ~5 D, \/ ]
  make-current one-of intersections- T9 }' z/ Z/ s/ N
  label-current* N+ g9 x- m" A/ I& F5 ]

3 E7 p: c4 W' |  set-default-shape turtles "car"
8 H8 l; e9 [& L1 X
) ]$ u$ ?# ~# z+ Y: n0 K  if (num-cars > count roads)% `4 i2 ?& O8 p# \, Z6 o
  [
- H' p$ a8 P' w, K1 w6 i/ T0 S4 ~    user-message (word "There are too many cars for the amount of "
3 A9 x% K+ `; Q                       "road.  Either increase the amount of roads "
% Y! u, m6 `7 D3 j                       "by increasing the GRID-SIZE-X or "
$ h  X" @& r. e3 X                       "GRID-SIZE-Y sliders, or decrease the ") N7 C7 T$ F' w; T& t+ W1 g
                       "number of cars by lowering the NUMBER slider.\n"
- k$ V+ W7 P. [                       "The setup has stopped.")
# j2 d" Z& w3 U3 Q4 `    stop
# b  V  }7 a' S0 _1 Z5 i4 D8 r  ]; Z$ [5 X3 Z  V: s, m
& k* O/ ~# r) K8 E% K2 g" H8 \
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
! I7 t! Q7 m0 a4 ?' K  crt num-cars
5 \; R1 v3 `/ v6 j  [
- T8 Z( `, m$ f- Y    setup-cars+ c: |' k2 x# j  a5 p& p, K9 j
    set-car-color/ U* f9 u" ?2 v1 k! z. A  i6 r! E7 D
    record-data
8 |$ K2 T" e( R/ p8 X% j  ]
2 Y7 [/ v) d* S6 @# v% I4 N, U, x8 ?  l9 B! F
  ;; give the turtles an initial speed- ]( X% V. E( T$ t$ T
  ask turtles [ set-car-speed ]
5 C  t! o/ C4 j4 i4 A
/ u. s$ z5 Y2 k) ^4 _/ r  reset-ticks4 \: q3 u, y* e1 D
end
( L5 y: O7 T  g+ N2 ^: f" E/ x9 W% x3 M* D' X7 G
;; Initialize the global variables to appropriate values) Y8 p1 r9 l# B  u6 ~
to setup-globals2 l3 \8 x' Z6 [# V8 F& u1 N
  set current-light nobody ;; just for now, since there are no lights yet
+ n) x2 d- z; o  set phase 0
" G4 D- a9 o3 p. d+ r0 @/ Y* l  set num-cars-stopped 0  n: P% S5 y# f: y$ T& g$ p' v. G
  set grid-x-inc world-width / grid-size-x
7 g. j4 u7 ^  q$ }& C! B  g- T" w; @  set grid-y-inc world-height / grid-size-y0 Y( l* E0 o/ q% m: d9 r

+ h5 H* ^( x+ z/ C8 F' o* l  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary/ u0 g$ f* u( m/ P9 z2 u
  set acceleration 0.0990 M6 k7 W# G! n7 ?  d! H! }
end
/ Y! E+ A+ j) o1 L- e# [% a6 g
- z8 t( N. w( p) k9 i+ r;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
& J) h: P2 F1 o* d: _2 k. w& S;; and initialize the traffic lights to one setting% y' R& m, {& K1 {1 S8 q
to setup-patches6 ?1 u; k# b  s
  ;; initialize the patch-owned variables and color the patches to a base-color5 ?( f7 l) P. ]/ o: I
  ask patches
  o5 F0 F% F$ G  [5 r! s% }  E) W" \1 W
    set intersection? false
! p8 K0 Z' m. b0 g    set auto? false
9 @- _+ Z" z6 c+ }% Q5 q    set green-light-up? true& Z; e, _# [9 {! b/ I, V, R+ L
    set my-row -19 j+ Z. m  x9 U: Y* ^* K
    set my-column -1
/ J2 |4 r  c' j5 A  u    set my-phase -19 b0 \8 M0 {4 `: U4 T9 |
    set pcolor brown + 3
$ H7 a* [: s7 x" w# x' W& m  ]; k  k& p8 n( z  l& G$ h

( K6 t9 x# c( u: D  ;; initialize the global variables that hold patch agentsets
/ a# U( ]. O" Z7 ^2 R1 w' `  e4 E  set roads patches with$ U$ {. o! m6 M/ u- T
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
3 q' y) g* f4 K4 D7 J3 Q8 e7 `, O  u: `    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]9 s$ R) H  o+ o- k
  set intersections roads with, q0 |) ]- g6 ~1 {( U. Y
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and/ ]6 t- M4 j9 ?# V) D
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
, W, [* s' m" G# T8 I  M" {
4 o* ?  ]; |% _+ H! h% F  ask roads [ set pcolor white ]- _& E/ O6 s) X/ O& ]0 d- r
    setup-intersections
1 I0 {% W3 t. d1 w) ^$ Send
8 {& s( C* D% J' o2 K5 v其中定义道路的句子,如下所示,是什么意思啊?4 t" E* ?" P. {8 S9 r4 j
set roads patches with
/ ?3 F$ ~. b# X% C3 M. t; L    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or2 G+ a+ E- g* q7 V
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
+ p1 s2 t0 n: p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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