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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。, d) k" b+ n. R1 K
netlogo自带的social science--traffic grid这一例子当中,
1 N. z/ J3 V9 ~. ?. L# |globals
1 E5 I1 p, [  m7 G9 C' _[4 r$ F  H; j; D3 ~) v
  grid-x-inc               ;; the amount of patches in between two roads in the x direction# K" n2 L5 U% L" z
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
, h$ _& d* N/ v; K3 b  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
: ^3 P8 z& [% G3 o# R: ~                           ;; it is to accelerate or decelerate
4 ?( h! P, S1 e" z( p8 G7 N+ x  phase                    ;; keeps track of the phase& t; Y9 o4 A0 w: U# ^
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
& T6 U: M3 a: x  current-light            ;; the currently selected light
, |  f6 e! y* q0 C8 J, q- a3 X1 k, d# M8 N5 v& ^
  ;; patch agentsets& ~$ D. t/ G0 i4 a! c
  intersections ;; agentset containing the patches that are intersections1 ?  d& a2 D. X/ R
  roads         ;; agentset containing the patches that are roads
( j) d5 y! X" u0 {( Y# B# I]
5 g3 {: n) y6 R' _1 x: T  n% s# ^$ t& D  Q* w* D$ |
turtles-own
. J: T2 l" [' j% w8 k[
- J& P+ z# @7 ~  v- f  speed     ;; the speed of the turtle( a" ^& v; v- V# J! j& j
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
3 T. p  y" t# r) y( c, o) q  wait-time ;; the amount of time since the last time a turtle has moved0 ]/ q0 O( c$ }, M' W$ k4 O4 A% D  T' P
]
8 A/ c7 q7 g5 M% Z* b/ u& h% q" a7 z
patches-own
/ G% M& G  T  K4 E[
9 r8 Z! Y. P1 P/ q  intersection?   ;; true if the patch is at the intersection of two roads
$ ~' u7 x& T5 T- z2 e7 Z$ C0 F  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
: c) t, N0 m& v+ L9 ?7 X9 f                  ;; false for a non-intersection patches.8 F0 d. n1 G/ _9 @
  my-row          ;; the row of the intersection counting from the upper left corner of the6 \' R5 S8 @& v0 O, x. A
                  ;; world.  -1 for non-intersection patches.
3 u/ g/ S. x  l% L' z, `  my-column       ;; the column of the intersection counting from the upper left corner of the
8 m- j0 M6 k$ H. k8 J4 Y                  ;; world.  -1 for non-intersection patches.7 i4 {% V0 t, H; W* D1 O6 i' S
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.( }  B: Z. D2 p4 v  L
  auto?           ;; whether or not this intersection will switch automatically.% O1 c: M1 i7 \& g; q0 x
                  ;; false for non-intersection patches.
: O: [# N2 L1 B]4 [4 f3 f1 @/ o& `6 s: m7 L

1 R8 ^% f' d) U  ?1 i8 y4 z$ l
3 _2 V6 Y. p2 S( |$ V;;;;;;;;;;;;;;;;;;;;;;& {, t5 Z9 h: M, u
;; Setup Procedures ;;
# z1 a2 M$ g. q9 l, q8 `) Z7 I;;;;;;;;;;;;;;;;;;;;;;4 ^: y7 T# j; A2 ]+ r
  ?* M) B9 V6 M3 a- }
;; Initialize the display by giving the global and patch variables initial values.! f8 w) ^6 p8 m0 m' U
;; Create num-cars of turtles if there are enough road patches for one turtle to* U3 n3 w# O1 V" f) T
;; be created per road patch. Set up the plots.
. c$ f3 r: c! W5 I& z; i- |  Bto setup, x, h- Y1 o' y# Y' Z$ x
  ca) f  F9 @, }$ `1 e' }" y: P, m2 Y
  setup-globals/ G! R+ [; C+ O
) J- A: }. _4 }& l' n" `2 S& o
  ;; First we ask the patches to draw themselves and set up a few variables  P2 M- j: w; S0 B7 U
  setup-patches% J; d; G' x' Y, Y9 D
  make-current one-of intersections2 b0 @4 P. B0 W, d* f. v% S
  label-current' c6 T% c$ Y1 L: k

$ q# R. x* c7 U# O1 N  set-default-shape turtles "car"
  W' t. p4 t* A8 Y3 L5 _5 `$ p
3 l/ ~5 {1 ^6 ]) W9 s) y- m  if (num-cars > count roads)0 q$ r1 [2 G5 |0 U+ O* z/ u
  [
7 S( i6 X" \; j$ O    user-message (word "There are too many cars for the amount of "
/ @/ X' H7 {) h# T/ G$ Y2 B                       "road.  Either increase the amount of roads "
8 i* e; p1 u5 J3 {2 d                       "by increasing the GRID-SIZE-X or "
! i/ M/ E6 T) n% P; x& d! m- U! v                       "GRID-SIZE-Y sliders, or decrease the ". j3 W  h8 d3 h9 z6 J" Y
                       "number of cars by lowering the NUMBER slider.\n"
- m. n! }, E" a7 T7 W% O! t" ]# r                       "The setup has stopped.")
1 m8 d+ t3 E' n- O% v' o    stop3 W9 _+ g# O" Y' o8 ~# @
  ]
+ ?) n6 ?. o! y  M+ N& l7 i; X( R5 O: M* l1 `1 u0 Y
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color5 @; C' ?. E/ O2 a9 F8 y: I
  crt num-cars
  M& S9 S, b3 q. _# R; S" X  [, x$ |7 c% O$ E; D( B
    setup-cars0 ]. [0 u8 h- |
    set-car-color/ V4 c/ ^8 v6 f7 X4 f
    record-data
6 X1 V' s6 k3 L2 d6 f  ]1 l; |1 A8 T- N' G; h; A$ b. |& i

4 u' V  y! |" K  ;; give the turtles an initial speed
* @! R3 B2 `, A8 ~4 J  h6 Y  ask turtles [ set-car-speed ]
+ F% D6 {  _& {7 [7 j7 [! x" D# T) C
  reset-ticks3 J5 }) R2 S" i5 [& ^) U( J5 v
end
5 c$ ^* G5 C4 O1 z9 D6 T% a# q7 F2 F; d  k# ?+ y# k3 a
;; Initialize the global variables to appropriate values! F& K+ z5 y4 e6 I8 z: B! x* `* E
to setup-globals6 J7 z/ H0 l8 M: L$ s2 V
  set current-light nobody ;; just for now, since there are no lights yet, l/ d+ F) r0 O# c3 n, H
  set phase 0
8 w- i5 \7 @" r+ {  set num-cars-stopped 0
# O5 ^, t9 p, p+ u  set grid-x-inc world-width / grid-size-x9 B  b, Y3 f6 \* i2 R
  set grid-y-inc world-height / grid-size-y
/ Z4 s  e+ [. r* i
7 K' h  N# u% h1 U, S* [  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary8 [- a. [3 z3 |7 E
  set acceleration 0.0995 Z/ ~( s+ \2 d- m
end
  M$ ?  z* {6 b, T
2 r# S- c6 x5 ]# ^& y# n1 x& U;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
. l+ [4 O. o+ ]5 g) Y+ F;; and initialize the traffic lights to one setting( F7 x8 {* R; e
to setup-patches
5 p$ {; Q1 Q+ q  ;; initialize the patch-owned variables and color the patches to a base-color/ B% F* t0 ?4 I- w2 {
  ask patches2 ^' K1 E+ A' S7 ]6 z, w
  [
: D$ e7 o8 w! D) ^7 X  ]3 [! a6 z    set intersection? false
$ g2 J3 n' h$ x- @4 ], a% ]6 r    set auto? false
- M1 Q1 e5 ^+ x    set green-light-up? true
4 N( w4 U: z3 R+ a' ]    set my-row -1( l/ E  o6 y3 O8 I
    set my-column -1' \2 z1 B. w9 C
    set my-phase -13 L6 I$ {9 A4 g4 v# y5 A
    set pcolor brown + 38 w& J: U6 w( W  ^
  ]
$ B1 A& F! |) Y+ L) y/ d* N- K, s9 Y. l- f  D
  ;; initialize the global variables that hold patch agentsets
: b' B, F% I: f3 @  set roads patches with) l6 @+ L/ v+ w, N) l' N
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or: }2 [) q5 s5 K6 E( B
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]  n' G% v* x: w2 k$ C
  set intersections roads with8 x& i! i: i1 d$ I+ O& q2 a( T
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
1 L7 W, i" \9 Q% {    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
5 `9 W+ t; d& o+ V8 d. g; W1 S2 g% e) N
  ask roads [ set pcolor white ]: r" L5 w% S' k; L3 f4 v
    setup-intersections
) }2 _2 E/ M8 g) {! X4 Cend
2 m+ b8 O+ y2 @  v其中定义道路的句子,如下所示,是什么意思啊?
- E$ D" ^0 C  v* @ set roads patches with. e! c6 s' K4 E5 [8 w5 v
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
0 T) L1 k- B1 O" {6 ]6 F    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
; d4 _2 q) z' O0 u% a" }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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