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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。
5 J4 H& d5 J9 D$ anetlogo自带的social science--traffic grid这一例子当中,# R2 f. U3 Q. J" Z+ d3 H
globals0 N, I" a3 U6 r! h/ s
[
( m6 L- M2 j# O9 E: o( b  grid-x-inc               ;; the amount of patches in between two roads in the x direction7 u; X- k0 m0 _& ~$ i
  grid-y-inc               ;; the amount of patches in between two roads in the y direction, k6 q# U9 B: [1 j+ ~
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if1 m4 o' H- `" J/ e6 v1 y& `
                           ;; it is to accelerate or decelerate
% r( ?$ Y* m" y* A% w6 Q+ @8 d  phase                    ;; keeps track of the phase% b! g. Z  f4 h0 |
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
( v+ U- x+ E- }0 `  current-light            ;; the currently selected light
+ H" w9 k, T8 W+ I; O
& r( n& T. q& P  ;; patch agentsets* R/ \, y7 e" r$ S
  intersections ;; agentset containing the patches that are intersections
9 Z6 Y# a( v& R6 D" \0 E' \  roads         ;; agentset containing the patches that are roads! E$ i; n: g+ r/ B% i9 v
]
5 s: ?; p: I, c4 g4 E) [) k
3 h1 s# g. Q0 tturtles-own; l8 X" X$ ^4 D6 \3 ?) T( ]
[( s1 K" Z, ~  a( P! w  B5 y
  speed     ;; the speed of the turtle$ s5 B: e4 z4 q
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
2 d/ m6 _; s6 k! c1 D+ A- `  wait-time ;; the amount of time since the last time a turtle has moved3 g, Z& f$ A# \3 r5 I
]- T; \/ y4 I/ n: a8 w' `

# v" |4 L9 ?# y8 ]patches-own' z4 G* i: R$ y& h
[1 x; H! O# Z& s$ u4 q
  intersection?   ;; true if the patch is at the intersection of two roads
1 n+ d* X2 J2 f- \  J( C) Y  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
9 |* y( s( {* Y3 o                  ;; false for a non-intersection patches.) h2 {+ U; Y% E* J) u4 ~
  my-row          ;; the row of the intersection counting from the upper left corner of the% F0 ?# \, r3 A) I7 u# b
                  ;; world.  -1 for non-intersection patches.
9 A5 {) z; D  Q, S  my-column       ;; the column of the intersection counting from the upper left corner of the
( \- f/ J" o5 X9 o                  ;; world.  -1 for non-intersection patches.
8 A7 s+ d( n! k% w, o  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
& t  l4 R% u4 [: E  auto?           ;; whether or not this intersection will switch automatically.! [8 x2 [, e. ], f4 H1 @
                  ;; false for non-intersection patches.
* ~$ L- ?& G+ y]
& f8 B  f7 S4 H" q$ U/ l: t
4 ?" P# p4 |! j1 u4 }
, S1 e# h1 ^: G- l9 s+ I;;;;;;;;;;;;;;;;;;;;;;
# g( x6 y& z2 r! v;; Setup Procedures ;;
, `! v/ y) I& p, C. d;;;;;;;;;;;;;;;;;;;;;;. M; J: J: Y$ K, S
$ z6 W& ]* {& s) \' [' ~
;; Initialize the display by giving the global and patch variables initial values.
$ b; q1 M8 s- U;; Create num-cars of turtles if there are enough road patches for one turtle to4 L' ~: e& z8 f2 ^" L7 d3 |: K
;; be created per road patch. Set up the plots.) u. \5 j( X! U/ ?
to setup! V8 M5 T% P. O  h8 O2 M. g- U
  ca
; o8 G! j7 B: o0 {4 Y% X5 z  setup-globals8 u0 S1 S% K1 M
! W% |- T( T2 C, P3 M
  ;; First we ask the patches to draw themselves and set up a few variables
' G6 f/ l9 i  k, h  setup-patches& d) i+ L3 a5 x$ u8 S
  make-current one-of intersections( E1 I& p1 ~! v3 D. q9 u& o$ [8 q! Q
  label-current4 Z; A( o: R: b2 F8 i2 K  E+ v  W
; U' n6 `7 n: c& t4 {
  set-default-shape turtles "car"6 B5 F. O6 Y. [' x% g3 c
- W% @) }, H7 Q  v
  if (num-cars > count roads)
9 X4 C6 I' r( ]4 N, y  [( K$ e- Y. Q& Y
    user-message (word "There are too many cars for the amount of "; ?/ B) e6 k8 B# K
                       "road.  Either increase the amount of roads "
: |, K) S  s% T9 x/ B, v                       "by increasing the GRID-SIZE-X or "0 A; y' h# V- O
                       "GRID-SIZE-Y sliders, or decrease the "
, W: q# w- A+ ^0 f% N) L6 ?: s                       "number of cars by lowering the NUMBER slider.\n"
# m" h( l7 M3 k; l, ]                       "The setup has stopped.")3 S' s( g+ s0 J* M3 y& c
    stop" L* b% t; j$ a5 o+ X0 |
  ]% w/ [& p; J4 Y
) O/ \0 E' d+ k& H7 Y, Y* [+ E3 y
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color1 h" L$ |: l, a1 J2 Y/ Q2 D( k
  crt num-cars
% j+ |4 W/ L. X% E  [
; y% ~9 o( c. ~8 Q    setup-cars
6 L5 w( j5 I8 u) a  P' |) F4 R    set-car-color
- V2 |( |/ q4 h% r3 q: v. I5 Q    record-data) b+ r5 d' R; u( B, `+ K2 v
  ]- b3 Q; B& |6 x/ y( J+ E4 r: Y8 V
4 B3 {/ ]. d8 D4 ~2 E% ?% S: r
  ;; give the turtles an initial speed
$ u2 @7 _+ p/ S- m, [4 w1 Y0 @7 h3 w  ask turtles [ set-car-speed ]
( }) k" O, i: r/ n9 h
  d# T9 @5 p) X  reset-ticks
) W1 U, K  G+ `% h% Fend
6 j, z4 N+ V' E- x) G3 ~" `% W7 ^9 F) i1 J5 P- p1 B
;; Initialize the global variables to appropriate values* Q: s2 i' S4 n/ k1 n9 m
to setup-globals3 [' i' w9 U8 f7 [: H( @
  set current-light nobody ;; just for now, since there are no lights yet
( w0 O! z1 y. N/ A  set phase 0
' o# |" n7 G: n5 p4 a/ u( ]  set num-cars-stopped 0
$ L4 K3 _4 B( R5 ^( X  set grid-x-inc world-width / grid-size-x1 }; P' n# f) A7 b3 {
  set grid-y-inc world-height / grid-size-y
6 G* Z' L. D1 L/ U- J& s' H
: }$ j. F" P4 i6 J, J  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary# B" O8 V' i: }( w5 h# S
  set acceleration 0.099
, a/ X- l5 ?3 m0 O% v; {! gend
2 g5 G, [! n+ @+ i+ v% Y6 P7 U9 T& X; D. ?. U2 [! v; C4 P( D
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,& t3 c8 f+ D) ~2 s1 D2 B* K
;; and initialize the traffic lights to one setting" E; A# ]1 t; ~+ _, |! ^
to setup-patches
% u! X7 p- t2 @3 k( F  ;; initialize the patch-owned variables and color the patches to a base-color
6 c% R8 ~) C* L' Y  ask patches
! o/ r4 T8 J' }" q4 W$ b% Y2 l  [
' G# Z9 ~, |- u1 E    set intersection? false* L! r- X& ^; U% x' n! W
    set auto? false. q5 d, X7 }5 B, @  g$ Y6 B5 u
    set green-light-up? true
2 l' z& G4 K6 Q& h# H    set my-row -1  f, @. [' S8 r) w/ c2 ^/ M6 k
    set my-column -1# S/ H* g# \+ g- \( H/ m$ ^
    set my-phase -16 Z, A- D3 B0 q2 f5 E5 Y. o: f
    set pcolor brown + 33 F9 I/ y7 Y/ }3 Q* n2 k
  ]. z2 I2 \" N5 c9 g/ z' e' s0 F2 U
. S( A& {/ s) n1 q3 t
  ;; initialize the global variables that hold patch agentsets% F8 C' {0 U1 }$ {/ n- J
  set roads patches with4 b2 l& ]' X" E) M/ I; M' @" g3 D
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
3 r+ l" G7 C# C5 @" ?, d' V    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
' ~  H+ L5 L9 U8 c6 K9 M  set intersections roads with4 o- g" Y& Z! C7 Y
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and' s1 r) [  T5 l3 M5 M- D
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]6 c+ `9 b% L) U2 a& i0 A

; V" K- R. U* k9 K" b% g  ask roads [ set pcolor white ]
1 E* L0 \' h' M# M; X6 [$ B    setup-intersections
( B  C7 ]6 ~3 m8 ~1 \3 Q  X+ J4 Eend+ F) |# d: T* ?6 R: o+ p
其中定义道路的句子,如下所示,是什么意思啊?' W. E3 \0 u. ~3 [
set roads patches with
6 w5 C& r* V0 o. P    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
/ m$ X0 W- w) a% k" W0 {3 |    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]& K( ?1 `9 m  M! @; i3 _
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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