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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。
9 T6 R! F1 p7 jnetlogo自带的social science--traffic grid这一例子当中,3 `+ ~( H# y  R; a8 D# E6 T" x4 ^
globals2 F' U. c6 U: ~0 j
[/ U9 [, y* M3 k4 u2 L/ J! T
  grid-x-inc               ;; the amount of patches in between two roads in the x direction
; d- w* R2 x0 n& ]1 n+ x  grid-y-inc               ;; the amount of patches in between two roads in the y direction  c! ~. V6 R4 n3 u/ V. W- P# {, H
  acceleration             ;; the constant that controls how much a car speeds up or slows down by if6 H) U5 L- Z" p
                           ;; it is to accelerate or decelerate
! J! D$ U/ [& B+ _% }# l7 a6 Z  phase                    ;; keeps track of the phase7 q- }; s1 x+ ~& k. r4 A  L) a
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure! w4 F6 [# |2 c) L/ |
  current-light            ;; the currently selected light! v" g. i- i* f5 E- h6 W! L8 V

% }" R) Z0 [) t% j, [0 \  ;; patch agentsets
6 j4 P; |% O: B  intersections ;; agentset containing the patches that are intersections" p6 }! r0 O; Q6 m" ^# p
  roads         ;; agentset containing the patches that are roads" n2 G8 i- {" d) k$ s8 Y
]
9 [1 e; V" Q+ [
! R. H- R5 Q" R, B$ Bturtles-own2 D4 [( q# s% d" U& L
[
! W( B5 X8 @/ {+ S- C# K  speed     ;; the speed of the turtle# X5 P: Y8 L0 g0 X+ O+ d- e% Q. b4 G
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
  ~8 @3 g% \8 l. Q  wait-time ;; the amount of time since the last time a turtle has moved
, ]% L6 s" C! b) A* I]7 e+ }. _9 q1 R, ]7 L% k

" l1 S. e# C. Z7 h5 O" kpatches-own
+ m. Q$ V" f! W" f7 n9 n[
: P$ Z1 S( V  p+ W. `8 c  Q  intersection?   ;; true if the patch is at the intersection of two roads
0 j' |  ?' ~9 }; G  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
4 H% A% T$ Y$ [2 [0 K: j  h                  ;; false for a non-intersection patches.& x1 F, I" J3 T1 X9 t
  my-row          ;; the row of the intersection counting from the upper left corner of the: h) c4 z! T: Z& ], d$ K
                  ;; world.  -1 for non-intersection patches.
* {! M- k* U8 F, t; Q. i3 G  my-column       ;; the column of the intersection counting from the upper left corner of the
9 X# a, u7 X# |; H# h7 Z% |1 C                  ;; world.  -1 for non-intersection patches.4 R3 ?0 C# f0 N0 i2 }, s% q# G
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
2 e4 i* x5 K% L  ]  v  auto?           ;; whether or not this intersection will switch automatically.1 h  T% D) y7 l8 }7 V, m  P
                  ;; false for non-intersection patches.( n9 ]4 z+ r9 o  ^/ z8 Z
]
; f4 _; X9 f' }8 n3 \
. e$ E, ?, V" Q+ l0 j
1 U0 p$ m) {! H. u" Q, _- j/ ^;;;;;;;;;;;;;;;;;;;;;;
; L! R3 q* D5 V$ g4 i5 y& N8 x! c- \;; Setup Procedures ;;
! M9 R6 u$ F, L' _;;;;;;;;;;;;;;;;;;;;;;) d; {: [8 w- P
: h& F7 K# s/ X0 Y# _8 d
;; Initialize the display by giving the global and patch variables initial values.
  h# [+ I; e) b) j7 I9 I+ R;; Create num-cars of turtles if there are enough road patches for one turtle to/ {; L7 f! [+ J. M
;; be created per road patch. Set up the plots.
& k; L3 o* o' `# t7 S* yto setup
% ?/ h. d- L$ x8 C7 @  ca3 B' h' S# Q- n
  setup-globals4 x2 S5 d8 W; l
) i) Q" [: V+ m2 e; D
  ;; First we ask the patches to draw themselves and set up a few variables
: H# G: u  S/ y2 K- [/ ?, o  setup-patches0 h/ _, H+ k0 y; t: A& M" e1 E
  make-current one-of intersections
! m: ]# D+ O' W8 H% l  label-current- S* J& i  i5 U$ \

9 t, F* T% ?5 F8 g  set-default-shape turtles "car"
8 J, u+ f* \3 [8 ~" ?  F9 d- e, l6 d) c7 Z7 K0 V6 D* b  S1 w
  if (num-cars > count roads)
1 k8 {# O1 M* b! a  [5 ^& N, |* W1 l6 b; j: B
    user-message (word "There are too many cars for the amount of "8 m2 d5 h6 U: [  z% U) p( j
                       "road.  Either increase the amount of roads "
. O( S/ S$ m) l, g$ r9 w7 u, j                       "by increasing the GRID-SIZE-X or "/ m% v; Q+ i4 {& g" V) b
                       "GRID-SIZE-Y sliders, or decrease the ") M' D' C; E: X9 J; C# z- M
                       "number of cars by lowering the NUMBER slider.\n"
/ y' m8 ?$ }/ [; y                       "The setup has stopped.")
6 D( t, W  t* Y. Z/ P0 k, F+ }    stop7 M- r" g8 ]8 O# Z& ~2 A
  ]) q1 V/ q; r0 M7 o* u

! E0 B; G, A# t! g% `0 r& R  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
1 h4 k. i8 h9 K$ ?! O  crt num-cars8 V8 R- f( l' [" I0 Z
  [0 a6 `7 f& |5 m! K- I
    setup-cars( S+ j. f* g$ E, j* W
    set-car-color3 Z" g, O! U0 u- [8 `
    record-data
) L& G5 @, e9 A. x  z/ k  ]) l' T3 p8 D3 t/ ^" a1 Z
3 H2 |+ V% ~6 d3 D* c/ I0 ]" P
  ;; give the turtles an initial speed' W- s0 ?" G) a! A$ t1 g% Y
  ask turtles [ set-car-speed ]
% E6 e: P, @5 r2 R: p3 h; _  q# O8 ^
  reset-ticks. c, K( T6 F5 P: ]/ M
end9 I% m4 |0 \, O1 w1 M

( E. c7 [8 u1 |( N1 q! J;; Initialize the global variables to appropriate values
" {3 l2 m) R: L, G1 Uto setup-globals3 v, ~3 S3 ^; J  h: r
  set current-light nobody ;; just for now, since there are no lights yet# g- l3 c* s6 g# x* m/ d& k% Q
  set phase 0
4 y9 H- p2 S! k, r  set num-cars-stopped 0/ M" j: C5 M2 ]5 T, Z# U
  set grid-x-inc world-width / grid-size-x
$ @/ t: @1 e: L) f1 d  set grid-y-inc world-height / grid-size-y2 B! n# Y; ?. n  K* n6 H/ M
6 W; a& A2 }1 O& U3 B6 q* Z
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary1 B1 h2 f: ~! p& D) J6 s
  set acceleration 0.099* r1 Z7 R) I% I6 b) [4 Y
end
+ v# V& v' J/ w3 z+ }: b$ |5 Z
$ G$ Z; w( R* j0 A# M  Z& G;; Make the patches have appropriate colors, set up the roads and intersections agentsets,8 q' W: _, m2 n" O7 R: t
;; and initialize the traffic lights to one setting8 x2 _1 L: \7 O( W1 C
to setup-patches
# S- C: f, m9 w) o  ;; initialize the patch-owned variables and color the patches to a base-color' f0 F+ }9 U) h; m& S
  ask patches/ {5 U) I1 H( d8 ?% L
  [
4 G# x( Y% a$ v( |+ F2 u2 z    set intersection? false
0 h3 v: y, [, E* z1 r    set auto? false
* I( |# Q/ E. H5 y8 Q    set green-light-up? true
6 ^7 m5 G4 x4 Z% {. b9 e    set my-row -1
! s$ T4 p% \) F7 l2 ~2 p- _, [    set my-column -1
- t& y; Y0 `4 J6 Z4 e    set my-phase -1
+ g6 g9 {: K8 T4 `( l    set pcolor brown + 3
- A( K# ^! t+ Q; c# Y  Z  ]' P& E- \( u3 C! o& W0 k8 z( V
# F3 |! }9 W9 b8 E6 c
  ;; initialize the global variables that hold patch agentsets! S; ^4 [5 I9 O7 a! j  S6 r. ^* F
  set roads patches with
$ P5 f  W5 z0 y6 F    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or. d8 D, m  v' r0 y; v
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
1 ]8 g8 s+ s+ J1 f/ D3 A; A  set intersections roads with
2 Y: @/ ]; h' s/ s8 V& O# a4 V    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and- v* b9 r7 d9 \3 {' V
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]! n# Y& o3 c2 t& F) t4 `
! f" _$ B% b% v
  ask roads [ set pcolor white ]8 \* \0 S& H: ?3 A+ X, ~% \
    setup-intersections/ x4 M- Y7 y7 N, E- @1 H
end: Y& V0 `3 }& o3 W7 x& e% Z
其中定义道路的句子,如下所示,是什么意思啊?5 l8 Z& v) j  d' w
set roads patches with0 J% ^9 J; W6 K, _, {4 d
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
* W$ X) V9 y9 i    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
2 E8 A# Q3 q3 O* A4 X7 H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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