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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 K* V0 [0 q/ {+ |
netlogo自带的social science--traffic grid这一例子当中,
% u$ b7 B5 x7 Q6 }globals
  H7 a$ H! j* z[' t7 K, K  ], p: X) O" Y
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
2 P" Q, O- Z' Z% b: j6 a# [' P, B, f  grid-y-inc               ;; the amount of patches in between two roads in the y direction
8 y# }1 W$ d5 O; D  acceleration             ;; the constant that controls how much a car speeds up or slows down by if0 s' R  F) G( g) T
                           ;; it is to accelerate or decelerate
: Y, s6 r1 L( z2 c( W  phase                    ;; keeps track of the phase0 T7 W$ ~; [4 C
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure  F( z  I2 V8 K: ^2 R
  current-light            ;; the currently selected light# ^- k2 O: @) y- `' D( F
" s3 d9 q0 z, f+ B$ I
  ;; patch agentsets: H: k9 s* m. ~  [& B
  intersections ;; agentset containing the patches that are intersections6 A7 v& ]; Z/ {0 g% `9 [+ M
  roads         ;; agentset containing the patches that are roads
: x  |' _- N' d( P' Y- i]$ R! ?) D( I, v  V

: _/ [" L6 {' X& w, Sturtles-own
5 J, i# F/ V" s% \, y3 F# q[
% O/ j$ e7 d9 G- x# P0 [  speed     ;; the speed of the turtle% d2 E5 M' Z: E- O
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right5 m$ R( `7 o+ j+ @9 j3 I5 P
  wait-time ;; the amount of time since the last time a turtle has moved
/ I  C6 w# g/ _& X]
( B4 e% A9 a; q$ G
) H' P- }  ]' F+ I1 ?) |( M7 t8 |patches-own
9 t  d- B% J/ ~[6 z5 Z; Q# l1 Z1 z( l
  intersection?   ;; true if the patch is at the intersection of two roads8 l3 e) M8 C2 k
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
6 w4 ?* a7 \( p+ O                  ;; false for a non-intersection patches." X$ r2 v! ]3 k, m7 g, T. i
  my-row          ;; the row of the intersection counting from the upper left corner of the
; I' |- [% z# X                  ;; world.  -1 for non-intersection patches.
4 w9 R: T0 s0 t! @5 g  my-column       ;; the column of the intersection counting from the upper left corner of the
4 N) ?4 E% Q8 S9 A. y! \+ I                  ;; world.  -1 for non-intersection patches.
" J: k# ]. _2 r/ E  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches./ }' u; m* v$ \$ E2 L: l1 v
  auto?           ;; whether or not this intersection will switch automatically.0 Y8 y( F+ M* T2 u+ O6 a# D1 R$ H
                  ;; false for non-intersection patches./ f- V% r/ B9 y- r  ~* R) J& P
]
7 ^" t" \' V" u6 e9 ?$ `) {3 s
( |, V0 u6 y3 a* T3 t8 a* w$ C, B; |2 T/ j5 [1 g! L
;;;;;;;;;;;;;;;;;;;;;;
' D$ k+ ^; k0 z;; Setup Procedures ;;8 K/ t5 j$ h: P% K& G
;;;;;;;;;;;;;;;;;;;;;;
1 _6 x$ g- H0 r
/ j, {9 d" g0 l$ Q: l6 Y- I;; Initialize the display by giving the global and patch variables initial values.
" ?% W1 J$ j6 [+ P;; Create num-cars of turtles if there are enough road patches for one turtle to
1 y6 q4 o* L% [9 d2 o7 c( _* N8 w;; be created per road patch. Set up the plots.3 X: x% ]  S) M. X8 i( Q, g6 d
to setup5 F3 M! R4 d+ F2 M2 u
  ca
1 n: a% D& N8 Q3 A  x" Y( u3 Y' U  setup-globals3 Q0 H* G) \9 Y1 m3 a

7 v5 q* V, G' P3 t& V! Y+ e  ;; First we ask the patches to draw themselves and set up a few variables
4 z) U- p; I9 g* |  setup-patches
7 T' J; i' a2 W  make-current one-of intersections7 ~/ C3 r  R0 d# m% f* U& F
  label-current; ~; X4 \$ }$ J. t

6 k% p/ O; I2 t$ C1 d$ m$ A& V  set-default-shape turtles "car"
8 d& M! s. J( l! I8 ?- s" i) @& M- p" m, a6 `/ q( Z$ q5 g7 J* s8 a
  if (num-cars > count roads)
& G, \/ t5 I4 D1 H$ A/ |- Q3 v  [
0 ~2 B' ^( ~' ?# {+ D1 v    user-message (word "There are too many cars for the amount of ", `* I& Q) v: D1 G4 T/ ~
                       "road.  Either increase the amount of roads "
& b0 ^2 C# ^9 N8 j5 X( X/ ?. e/ O$ Y  P0 Z                       "by increasing the GRID-SIZE-X or "1 b( J+ \4 e0 x7 l( ^5 U7 J
                       "GRID-SIZE-Y sliders, or decrease the "5 A/ R0 M( f+ B; M4 q
                       "number of cars by lowering the NUMBER slider.\n"- s- x6 D+ R4 v; ~4 q
                       "The setup has stopped.")
1 ?5 O0 o+ h/ |. c  q    stop) ^6 N, H  S( D, F
  ]. I4 Q0 ~2 r) X5 m
0 |- ?( h- {. E* `0 m, s/ _) k
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
; m7 Q* r0 e% o5 R5 _  crt num-cars: F9 f4 L: ?1 K# {# |5 Z
  [
* Y# n2 B" N: }    setup-cars0 t5 y& {" U  p; P& c* }7 @
    set-car-color
4 ^' [. Q3 q! r9 |4 B( {, _5 M    record-data( ~7 q9 ~+ @$ J6 s/ A9 y$ R+ S
  ]
* D2 o4 h7 i' l$ a5 [
+ v6 R' @  |; _' a9 g  ;; give the turtles an initial speed
( p: \' _, q0 \2 H# |+ B0 E  ask turtles [ set-car-speed ]
6 j1 \* V% r7 C* D/ x
8 U" \: L! c; ?  reset-ticks
! ?# D, s% N! d3 P( @' lend$ E7 e4 p, ~) g4 U! s! G

( O0 M( e% Q2 S" h# i/ v! s5 p* ^;; Initialize the global variables to appropriate values7 t& A) Z% }: @7 x2 @
to setup-globals
8 L) j9 W" `- F3 G3 ^" u  set current-light nobody ;; just for now, since there are no lights yet8 ]1 k, D& X9 K9 |. s$ y* t  s1 W
  set phase 0- M4 S. q8 m4 A$ g- r# z
  set num-cars-stopped 0
0 C) r+ C' `# m  set grid-x-inc world-width / grid-size-x
7 G+ }5 n* d1 r$ d  set grid-y-inc world-height / grid-size-y% [5 P! \7 V0 w' n! S5 C7 t& }

4 B  Y! v6 I7 H8 K( _  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary/ p; ]- ~. q5 N  M
  set acceleration 0.0997 Q6 [) E' L$ C: c2 U  }6 ~
end. k4 D+ ~$ ~; z" v

* u- j, _# g8 F! Q8 R) m;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
. j1 j8 Z1 k, E8 |" L;; and initialize the traffic lights to one setting5 u2 L- [( j2 K6 `" C
to setup-patches
: h8 p! ^; M, `! x# r" i. D  ;; initialize the patch-owned variables and color the patches to a base-color
! L# B2 A# D) w6 ^. e( g& e  ask patches' e. ^8 c( v2 \! P- S: `" O5 c
  [
+ S5 I8 g* s+ m) G    set intersection? false
7 ]. S& M$ D6 g! I$ N1 t9 P  Z/ m    set auto? false
' \4 p4 `. x& M- @. g9 ?    set green-light-up? true! [2 P& `% x4 y9 {0 [  y
    set my-row -1! D; A* T* Z( I! y- {/ V4 }1 S
    set my-column -1
! ?" ^2 Y2 p: G5 Z    set my-phase -1
' {7 e; z/ L7 w& b: u    set pcolor brown + 3
* j. `- \! F( B  ]1 r3 e# R! b- s/ u8 i+ W+ V( s

3 a7 E: r: h5 a) I0 Z5 J  ;; initialize the global variables that hold patch agentsets
" I" U1 o7 D1 `, r( i7 @. }  set roads patches with
3 O& D* N! ]* q0 |! }    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
. D4 A2 l" e' z2 v    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 n$ J! p& b' G; _
  set intersections roads with- l+ V' D2 x& \$ S- _
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
2 Q7 a# j' B2 V- Q+ E. d    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]; j7 u8 P# t9 b1 m4 E
- B+ l4 l2 Q7 a9 m3 d
  ask roads [ set pcolor white ]
# O2 q4 U2 c$ {7 v* x0 a8 W7 c5 S    setup-intersections# L5 p) }4 I+ P
end
+ z4 }$ Y( O- S: K! ^8 k4 P其中定义道路的句子,如下所示,是什么意思啊?4 L/ b$ F% A0 S7 v7 Y& N
set roads patches with, a- Z, Q! x) o
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or. y; T' m# f3 R
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
) v/ g. A) H6 ?. Z) u! ~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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