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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。- R8 T: x1 I( `- V
netlogo自带的social science--traffic grid这一例子当中,  z) p& M6 L: M4 j1 B  V0 P8 O' u
globals2 U: c' P4 H) `; r
[
& _% f' W* \  a" u  d. @  grid-x-inc               ;; the amount of patches in between two roads in the x direction6 A2 V$ O6 m/ }& e/ m7 Q4 Z
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
# M2 Q; I! R; G1 l  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
. f& y, l, k+ R1 c                           ;; it is to accelerate or decelerate( ~0 M& v' h$ r# d3 U
  phase                    ;; keeps track of the phase
5 p& j' t8 l2 H1 @$ r% ^2 X" \  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
1 Y1 q" D6 \- T. S  current-light            ;; the currently selected light, v& l# {/ @- o! M- u( O

& I, ~! L! [4 C$ U  ;; patch agentsets
" ~$ e* A: ~* h  intersections ;; agentset containing the patches that are intersections
! @# D. a' ]4 @4 M. E; R" {- ]# p- _  roads         ;; agentset containing the patches that are roads* u6 G; x+ ]# [  I! q4 o
]7 I, N  v( u4 o
3 ^# _: A& D/ _" q
turtles-own
% N6 M& G5 |: O$ A3 b" W[
; |# M" k1 q& U  G% s. w  speed     ;; the speed of the turtle& p! C# T3 v8 E/ i* o; ~' |9 n6 h
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right, q: |5 {+ w9 [/ L! N7 B6 S7 V" X
  wait-time ;; the amount of time since the last time a turtle has moved) k& `. z7 V7 l8 \
]6 P! K- O1 U7 r6 s7 t8 Z

, m* F' l" i( q! K; O0 Ypatches-own
" j: b. ?1 u3 f$ Y[! n* ]  B7 D( i$ \1 ]
  intersection?   ;; true if the patch is at the intersection of two roads6 D/ u% Q" a! e, ^
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.. i2 {1 I0 \( ?  o5 ?5 T* H# p
                  ;; false for a non-intersection patches.
: s6 `3 c4 ]$ a2 C  my-row          ;; the row of the intersection counting from the upper left corner of the% A2 G: P6 |, i2 p- d* Q& U
                  ;; world.  -1 for non-intersection patches.
+ t$ j. n' c- h) u5 |( @( p: b  my-column       ;; the column of the intersection counting from the upper left corner of the/ d; ?: _5 J3 U; r1 J7 ^; ~! a1 J
                  ;; world.  -1 for non-intersection patches.- A) e8 u3 V6 E: {5 E  a
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.% T) |' c9 S/ M
  auto?           ;; whether or not this intersection will switch automatically.1 U; a+ G/ F4 s; c# I
                  ;; false for non-intersection patches.- h5 Y4 L$ r! I! `
]# ]( J+ K/ G' f$ ^. Y
; c( E/ H- z# o
# U5 R2 v. J% v4 V* t
;;;;;;;;;;;;;;;;;;;;;;$ [- |3 x& l6 y1 K8 J
;; Setup Procedures ;;
6 w, `0 w- ?) R; E; ?;;;;;;;;;;;;;;;;;;;;;;7 j* a# M$ Q0 b. C. o: B) T

; a. ~* q- I' u( @8 G7 z: V& n;; Initialize the display by giving the global and patch variables initial values.. \) t* E, A0 t3 H
;; Create num-cars of turtles if there are enough road patches for one turtle to
/ W9 k" p# y" ?6 r;; be created per road patch. Set up the plots.
  L& @1 r4 U- R3 {; @: z: xto setup
8 f; X* J2 g0 L) Z( z$ U6 P0 _! e  ca3 m% s( N4 P) |* R+ i; a! k8 {
  setup-globals
) B" ^1 y3 I* N7 n+ S8 S, a  a( K& A* d
  ;; First we ask the patches to draw themselves and set up a few variables9 G) o1 g: A% C
  setup-patches1 Q. R4 G& i  u1 ]# T" k
  make-current one-of intersections
0 U* x& D' J1 i. K; |$ L  label-current4 j7 |7 y4 j  j8 y  B* e9 u

* g  Z! W; ?  `  set-default-shape turtles "car"
* y( u3 B5 L4 k4 W
2 B& Y* ?; e$ J" j' \6 M# T; R  if (num-cars > count roads)* |4 V: G! h. {1 n2 u
  [
* V; F( [+ c% }/ g    user-message (word "There are too many cars for the amount of "3 R5 D5 D2 E" f9 u9 Z+ V
                       "road.  Either increase the amount of roads "
" R$ B) N' y! A) x+ M                       "by increasing the GRID-SIZE-X or "
' |- m" }& `# L" L                       "GRID-SIZE-Y sliders, or decrease the "
+ j9 w1 ?. t8 a6 }/ A5 c& {1 M                       "number of cars by lowering the NUMBER slider.\n"
) ?7 q) Y8 `/ _- E                       "The setup has stopped.")
! l) I7 B0 V9 Y# F    stop* R# x' [, f+ Z" ^3 t5 E5 M* a
  ]& p6 [/ n! O' {: w5 ?8 t" R
4 [* m# X  H. `( q; O- Y
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
1 O( A$ {  T# g$ u5 `  crt num-cars. C6 p8 g( Q- |; U( E) z
  [  V1 h) |+ n% }" R9 ^
    setup-cars9 m! z! ?! O  F; v' @
    set-car-color
( s- Q6 Q; i3 q    record-data1 {9 \  @" b& w- G2 G
  ]9 X0 e9 l8 F! r3 ]

! `' o- s! G" i! p  ;; give the turtles an initial speed. Y3 Q$ x6 A/ E4 s1 ]
  ask turtles [ set-car-speed ]
" B$ P; Y$ @( I6 E* t7 g7 g2 z. b
  reset-ticks
: c- p. ~9 x0 o3 r8 Uend2 K4 ^) G& f: s3 \8 q5 s
+ r5 R8 W# f, s8 j( [
;; Initialize the global variables to appropriate values# Y  a/ F+ l9 e- l, W* Q' G- |
to setup-globals7 h0 m; O3 p/ e9 c" l; d' O
  set current-light nobody ;; just for now, since there are no lights yet
; r5 @# @2 ]4 E  set phase 0# G( Y0 M- f: _" K; j& u
  set num-cars-stopped 0
1 R) a+ A- T+ u; B& y4 ~  set grid-x-inc world-width / grid-size-x
( j# P! E$ p" I; I3 i+ q' }  set grid-y-inc world-height / grid-size-y  h  _7 S' @% ~/ V, S

3 B* r# Y+ R: H  W2 o! L  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
. D0 Q; g, o6 H  set acceleration 0.099. l( y( E- A- G( e1 W  |+ B
end
) Q9 g$ [+ W3 _5 V
3 T; K! S" K) s4 X' I: n;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
9 T% E) v+ i7 z) j9 q: F) B;; and initialize the traffic lights to one setting, B1 F1 N0 h9 Z7 t  m. c- A: d* f! Q
to setup-patches. s5 Z2 M9 _: j& I2 V% E
  ;; initialize the patch-owned variables and color the patches to a base-color
1 o, ?5 }7 a& i  ask patches% ?2 z  C/ L/ P* s: B
  [
% L+ m  ^' c* G6 Z* l    set intersection? false( ~4 i5 h. ?( I0 [! D
    set auto? false  T* Q& R+ P: N. `6 v
    set green-light-up? true4 E4 c) O8 o- u: e1 |; I
    set my-row -1" [# E7 L" V5 b3 I7 @
    set my-column -1# r) O- l3 L/ V, r" j2 _, Q9 x
    set my-phase -1
* c- i6 m3 m' l' r  K6 r    set pcolor brown + 3
  J) f% |" R* V9 w/ [  ]) y7 k+ c3 ]" p) V+ \5 {5 Q

. |; d/ t1 {9 d( M+ q( m: v9 S  ;; initialize the global variables that hold patch agentsets* Z2 j$ z  A5 w" _0 P
  set roads patches with
  ]/ T; I. \: J+ W' c7 N$ `    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
; Q% j. w5 f( `5 b( M0 I    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]* t' |3 e: e; R
  set intersections roads with( D" V7 R7 L+ l; P7 x( H0 I9 _5 S6 a
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
, J  @. T) f0 M3 e1 z    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]  }; @+ ~7 g& j/ K( R7 y
0 k5 M$ h& v  e. N9 _- Z4 L
  ask roads [ set pcolor white ]9 P7 n6 M, H* Y
    setup-intersections) A( y; K! q/ J
end
7 e) U; q4 C! S8 V其中定义道路的句子,如下所示,是什么意思啊?
8 |7 `. G: m. e9 t" J8 | set roads patches with
5 T- n# C3 {' Z0 q1 O) {4 }/ q( R+ G    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or0 j3 Y3 J1 @+ h( |. S
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]* w3 Y& W  W" \* Q6 O2 _
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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