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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。
+ \; v  q* v* f# }9 N2 ?netlogo自带的social science--traffic grid这一例子当中,
7 O5 U; l. J# H6 F6 ]5 v. u. Fglobals
- I9 c  q8 l4 i+ V; `( Z3 I[. @0 y6 Y( h, A+ j0 j1 g
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
% Z% C6 A8 x& m0 _# |+ h6 V9 P  grid-y-inc               ;; the amount of patches in between two roads in the y direction
" Q* X5 Y3 [: c; E9 E  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
" E2 G' O7 a9 H7 C7 l# {                           ;; it is to accelerate or decelerate
2 G" f1 r& a5 P8 p. S  phase                    ;; keeps track of the phase8 X4 y' M  B% H5 j+ M
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure: @* T$ u$ ?9 x1 E2 _
  current-light            ;; the currently selected light0 |1 D, J4 K9 B/ L) v

. Z( m/ f2 S0 s+ V; j  ;; patch agentsets
2 P" h1 j) v/ U. u# }- O$ S  intersections ;; agentset containing the patches that are intersections
# u* Q$ `& D4 L% [  roads         ;; agentset containing the patches that are roads. k/ f/ g9 c$ e5 K7 [& _
], A' F- J. W, B$ O3 R
& g; T4 x6 I( c: ]% ^
turtles-own  l! k# n7 O& ~$ u8 L6 t' k
[
& P4 W" N2 R* d( A# ~  speed     ;; the speed of the turtle
! j- l, S" T' Z: f7 x% A/ r* _6 ]  up-car?   ;; true if the turtle moves downwards and false if it moves to the right' z7 O7 s1 P/ n: b+ d+ ~( m7 ^
  wait-time ;; the amount of time since the last time a turtle has moved. d& W2 y: }7 ]2 n6 |7 j
]6 Q; ~# @! Q" R2 G
+ |6 {0 h: ^: u. `) s- ?  l7 l
patches-own" I1 _' j: Q" I! P) V7 O
[
" m" R* C9 K: u* s( O) X  intersection?   ;; true if the patch is at the intersection of two roads0 f( G1 W& J( ]4 y* X. [$ w4 C( u9 R
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.; J' N0 q7 i- f6 _, A
                  ;; false for a non-intersection patches.
3 v" H) D' i# q0 b% K. H  my-row          ;; the row of the intersection counting from the upper left corner of the
' J. Q7 u6 _$ k3 i& |1 b                  ;; world.  -1 for non-intersection patches.
( c4 S8 R# h0 z8 K. C: n+ w/ e  my-column       ;; the column of the intersection counting from the upper left corner of the5 u+ d* o* |; r& B' E: j
                  ;; world.  -1 for non-intersection patches./ M" Q$ s1 o3 q4 R; e
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
8 R0 X1 P9 U) n* b0 d3 A  auto?           ;; whether or not this intersection will switch automatically.( |) U/ k! n/ d* ]
                  ;; false for non-intersection patches.* m8 V) s) X8 `' S9 m/ g
]5 h, J' f8 R9 E/ m! [9 f

8 T6 R% k3 W, h9 e9 L2 Q" A
7 c6 e2 X! j. i5 N6 V8 @) R8 T;;;;;;;;;;;;;;;;;;;;;;" n2 g, W1 q- a0 e* a7 f
;; Setup Procedures ;;
8 ^" n/ ^7 q+ u;;;;;;;;;;;;;;;;;;;;;;% _6 h0 d! V1 U; h( w
+ U" B' `' \0 S1 v% p
;; Initialize the display by giving the global and patch variables initial values.
- H3 L4 W: N' j% Z" j: p;; Create num-cars of turtles if there are enough road patches for one turtle to
0 x- b1 e0 d& L) T4 B" q6 U;; be created per road patch. Set up the plots.$ q. e! r, E3 Z; N9 W8 N
to setup) l) t; d5 W% S/ N9 R3 \
  ca
9 P1 d6 L# L; ^  setup-globals+ Y, h. Q: {: W+ z: p% W& c

, s4 a0 R" w: }. }" X: a" v  ;; First we ask the patches to draw themselves and set up a few variables  V: x, R2 s) s, c/ n. P
  setup-patches9 \% j4 r5 O4 s: W4 v# h
  make-current one-of intersections; A& R  L% X. B" r! B
  label-current% m4 c$ N6 e3 y0 C! q' [
4 A2 S) o7 Z" a9 l" V1 v
  set-default-shape turtles "car"
' @- H2 r7 x9 Q! P; Q$ [4 s
7 [% n$ R) F2 N/ r: r; }  if (num-cars > count roads)8 h' z# n; D* i8 W- v
  [
3 x) q8 O6 u$ ]' J    user-message (word "There are too many cars for the amount of ": q6 W# b+ i8 V7 K( a% L2 [8 o
                       "road.  Either increase the amount of roads ": L: z8 L4 K( V
                       "by increasing the GRID-SIZE-X or "
, A) O/ y, W/ U7 {6 U6 `" q: B                       "GRID-SIZE-Y sliders, or decrease the "
& R# x* B8 }2 A+ x# R+ ^                       "number of cars by lowering the NUMBER slider.\n"
  ?6 v8 k& H% ~+ @+ n                       "The setup has stopped.")$ \; y! q& u& I4 ~$ E
    stop" P( e/ {3 c( J. Z
  ]
/ x; v# C9 O8 }2 q
, x4 R( |0 A( f7 s9 k  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
! k/ J& n, U& e$ h- X+ v  crt num-cars
1 x+ H8 q' u1 o2 ^- T  [% h/ U* ?6 ~% Q7 c- `3 h3 S$ N: f6 q
    setup-cars
; q7 a/ b5 n3 P! R* s    set-car-color  U: W9 c2 e0 C6 H4 |
    record-data" e  J5 Z7 X+ t- q
  ]4 A3 i" w/ |1 x$ V& U7 Y. T
5 C/ H0 r1 c) e. w4 ?
  ;; give the turtles an initial speed7 R) D- o' y8 }' Q
  ask turtles [ set-car-speed ]
1 ?+ u; K) p4 z: R3 }' p
- o2 F$ b8 v- Y6 V3 u  reset-ticks+ ^5 I8 P1 a4 g! G
end* T: q, Y0 ?$ Y, [1 u2 ?8 k# t* |
% i. F3 K! M# L! l* \
;; Initialize the global variables to appropriate values
* J9 d6 e9 \& O3 h; M* p/ ~to setup-globals
/ y1 w* ^) h+ Q# J! c  set current-light nobody ;; just for now, since there are no lights yet+ p6 Q# b* I. W
  set phase 0. X. K) b1 e4 M) V( C2 H
  set num-cars-stopped 0( Z0 @) F4 @. @' C9 i; ]- `
  set grid-x-inc world-width / grid-size-x
" X9 p' L% C  y8 |; ]/ ]+ }  set grid-y-inc world-height / grid-size-y
8 @9 Q8 d8 ]1 ~" g; I! j: ~; r* a- [
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
7 F( C: X5 m) U+ P1 L3 }" b( Y  set acceleration 0.099! g- z- [$ ^7 U, `( U
end7 N. O0 l) H3 c1 G) R

5 N) o3 d1 b! `" L;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
2 v) T  w! p2 s* B;; and initialize the traffic lights to one setting
3 s1 P4 ]- q1 h  J- o, ?to setup-patches0 `! ^+ i7 ~3 F
  ;; initialize the patch-owned variables and color the patches to a base-color" G+ u2 V$ H6 {6 Z; A+ |; a6 P
  ask patches, Q% J4 R, ]1 i" {4 z
  [2 |& a! W' {/ H5 C6 ?4 `( _5 A# s
    set intersection? false
$ m& ~9 l  @5 S5 {- _' [; w    set auto? false
3 b: O' p, N6 }    set green-light-up? true
* {7 @$ d; h6 i9 e7 G' f7 u    set my-row -1
# P$ i: Z1 J' f$ L: b, U$ Y$ [    set my-column -1
2 g; g9 u6 B9 _5 t- c$ a, c3 H    set my-phase -1
% l5 @: R( `# F( o4 ^    set pcolor brown + 3, ]( H+ f2 R3 r5 `
  ]  @0 z3 ?. e6 b
  D- @3 `& p. D$ E; C$ p( E: T: P2 J
  ;; initialize the global variables that hold patch agentsets
; V; }% E% Z0 R  set roads patches with
/ j; P- S- ]& f; u9 b1 D- M  O9 B4 ~    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
8 k. C2 w1 l( c2 h& Y3 l* Q! J' p    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 c" W) w  [7 p; x+ m3 {2 j
  set intersections roads with4 u% U1 a' L+ W' G
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and, d; B0 z2 u6 T& ^! N
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]' W4 K5 c3 i+ b* l# U
" ?+ ?: x) [. P) F, d1 A
  ask roads [ set pcolor white ]# c, C3 e- _$ c. C3 X+ V
    setup-intersections
- G+ u& F/ N  F) r1 y2 F; T; l9 lend7 p6 b" v6 E% F
其中定义道路的句子,如下所示,是什么意思啊?
) {+ ~9 D& `/ B! F: x- y7 r9 R& d set roads patches with
. t0 P* f5 V+ p+ ^3 N/ [; Z0 V    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
& X: J; Q9 t) ^; Z' r+ U    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]- ~7 K) K$ v8 r" W& q8 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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