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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。7 Q8 G. [6 {" x: t% g$ k
netlogo自带的social science--traffic grid这一例子当中," I; J3 ?$ S) {
globals
7 b9 t1 s2 N# i6 L! U9 n9 c" k[9 f3 F9 F2 r2 R- B
  grid-x-inc               ;; the amount of patches in between two roads in the x direction7 o) }( D% O" y9 z" _, O8 _
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
' U: ^6 I% m3 a* N$ c  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
( Y$ K  m* o5 c) L6 S                           ;; it is to accelerate or decelerate
  p2 J# o* U4 L9 z1 h6 A( L+ r9 `  phase                    ;; keeps track of the phase
; X( H2 g1 e! `0 f5 }  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
, R* q4 R% e/ F9 k4 T  e* G  current-light            ;; the currently selected light
# b- `9 ]& {3 u4 N4 F
, K1 Y& L' H; D, {# S  L2 J2 |3 J  ;; patch agentsets
9 c) }8 A9 [) R4 P2 f  intersections ;; agentset containing the patches that are intersections0 r2 T+ b/ `( g- q" g. }2 Z
  roads         ;; agentset containing the patches that are roads+ j! R* r- f! w4 }8 d# ?
]. M# l9 E3 B  {+ H7 N/ f
9 Z2 A' n  m) I1 x
turtles-own/ [# I! M# |/ J  R! f, a, i
[/ L- b. }. z9 T( \# S4 k
  speed     ;; the speed of the turtle* s9 N! x6 h  A( h6 q
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
! c- J+ t* t$ p5 {, N, q  wait-time ;; the amount of time since the last time a turtle has moved8 d3 R# G$ K: {5 G: ?/ P+ g4 w4 W
]+ N" Z3 l* P$ \% \

7 h1 n9 c3 j' N3 `- G" dpatches-own5 a: P$ {! T9 H! q% E# m3 W
[8 Q6 K" Y( Y4 W, L6 x5 G1 ?
  intersection?   ;; true if the patch is at the intersection of two roads
5 h" S7 X. T! m2 i* Q. O  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.; n5 q+ |4 ]" P) P4 \/ G
                  ;; false for a non-intersection patches.1 ]* O. @8 y) m9 Y) `
  my-row          ;; the row of the intersection counting from the upper left corner of the
8 _1 U7 o9 ?' s1 J                  ;; world.  -1 for non-intersection patches.
0 [# l, H7 M, i% c2 \7 p. O6 A1 I  my-column       ;; the column of the intersection counting from the upper left corner of the
4 ?) P: @) M5 n! \                  ;; world.  -1 for non-intersection patches.6 d! F' \0 c# ?* ?
  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
; h% I* d2 B4 ?  auto?           ;; whether or not this intersection will switch automatically.
  U1 T- N% J! k3 Z                  ;; false for non-intersection patches.
9 d/ w" o- ?0 u: h9 i]7 T$ Y( \+ p4 a

+ e9 D0 J2 K( [4 n3 Z5 x
) B# \0 }5 Q1 m$ f1 Y& F3 ~;;;;;;;;;;;;;;;;;;;;;;
' D. `% t% y- E2 e3 Y) e# X& ?- S;; Setup Procedures ;;" G4 ^$ G( |- S3 O$ L/ P) X. O
;;;;;;;;;;;;;;;;;;;;;;$ ~2 x/ O# h1 C1 k* `
3 d$ l/ f: m- m
;; Initialize the display by giving the global and patch variables initial values.' A$ [3 Q: m) g8 Y, Z
;; Create num-cars of turtles if there are enough road patches for one turtle to1 }0 N5 @7 {  Q9 f# A
;; be created per road patch. Set up the plots.8 J3 \' R* E4 l/ P$ K, x
to setup# E; _6 b& A5 B. r& |# \" c
  ca
$ h& ]/ F" d( _/ O7 S* r# G* `" S' t  setup-globals
5 w' I; k8 b* r  p
) R5 E$ @7 |- W& K( F  ;; First we ask the patches to draw themselves and set up a few variables1 y- T* n+ |$ }0 F# U3 r: |
  setup-patches" d; e- H- u4 J' ^; f2 d
  make-current one-of intersections
! M% C2 W5 _  M& ~1 y8 e3 ]7 Y  label-current
: T% h  x" u- R% ^, i
1 W# q1 b. Q+ t9 L2 W- A5 w  set-default-shape turtles "car"0 v, [$ c1 e1 @  n1 k" ]* F
' Y4 I3 x6 O  ]/ `
  if (num-cars > count roads): _& d/ e$ `8 n8 ~
  [
6 R  b/ x3 y. g    user-message (word "There are too many cars for the amount of "  v: z' w  S. V7 @
                       "road.  Either increase the amount of roads "
8 r' \- g" M. y3 J9 l- B3 z; B                       "by increasing the GRID-SIZE-X or "
9 m5 v" b) q8 v" t. P                       "GRID-SIZE-Y sliders, or decrease the "" R# Z& m* U# y. y: b: U2 I! d
                       "number of cars by lowering the NUMBER slider.\n"
! x4 ?2 [0 ^6 l                       "The setup has stopped.")  w4 q! x4 a7 `' ]8 ]5 ?) w3 r6 c
    stop6 O! K1 i% x  v8 [2 g
  ]
2 r) }9 q" Q4 |6 Y& h. R( O+ V# Q+ s) u( j1 D. [$ m& ^1 N" |
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
/ g7 M+ b% p; a2 m8 w% a6 A  crt num-cars' n) t4 S5 ?+ T6 }0 l
  [
0 v# K6 K; d5 B( k    setup-cars8 H+ w) T2 ^; D4 l6 H
    set-car-color
$ Y; f( q! }7 x! U& C    record-data2 \" O/ {; J9 w* I
  ]/ g6 q( a) d8 x

: B( D7 u2 {2 Q" P& x( N  ;; give the turtles an initial speed2 ?- d9 S/ P/ n: Q
  ask turtles [ set-car-speed ]
, j" l6 N8 n; k4 x. N& S4 j6 p6 T& F3 |
  reset-ticks8 y2 M! q0 J1 |& n9 G2 E
end  g, Z# ]+ p0 y+ v/ B
; T2 R: I1 ]% G& Q2 ]. V
;; Initialize the global variables to appropriate values( I. A1 {( V1 Q: Z& d
to setup-globals# a2 u& \/ W% |6 b' y$ o
  set current-light nobody ;; just for now, since there are no lights yet) x; W2 U6 Q7 b! C& `1 I, t: B! r( h
  set phase 0
$ W4 H- \5 x& b% i& j* P/ f  set num-cars-stopped 0
7 E  [7 q) ?+ M: ~  {  set grid-x-inc world-width / grid-size-x
) w4 R/ A% ~+ g% j' L  c0 U% ^  set grid-y-inc world-height / grid-size-y  {' [# V! ]5 z1 g4 n3 \
2 W% @" w' n. ]7 @
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
' w# c3 T+ w" z8 L: X  set acceleration 0.0990 Z4 O; l* j% e* P5 d1 J9 J& H* U
end! z4 l+ z/ \& W9 x1 O
7 M7 \) |4 X' n0 r9 H9 h$ Q, w
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,& Z: ?" v- g1 @5 P2 Y* k
;; and initialize the traffic lights to one setting3 o7 \; U* }: P9 [5 w
to setup-patches
/ c. g0 w5 g! A9 `1 G4 L  ;; initialize the patch-owned variables and color the patches to a base-color
* i9 I- J' L6 v  ask patches4 {1 Q3 N+ C1 d6 b4 \
  [
/ z; D7 }9 u  K  t  P    set intersection? false. H$ n  p4 L; P" l) V" N6 B
    set auto? false0 |  ]0 L! ~: h# D; L: s
    set green-light-up? true
2 L: j0 c7 d9 [; P3 |! j; q$ v    set my-row -13 ~* D+ I( q7 D0 x, C) K
    set my-column -1
" v# f1 y) L) L9 z3 n1 q+ M    set my-phase -1" O4 b, f8 ]' E, E
    set pcolor brown + 3) W6 T' Y7 u4 U( R) c
  ]
: {6 D) ~: E: m8 l' P( B, T+ ?( d* S, y7 A" f
  ;; initialize the global variables that hold patch agentsets
5 ]' _0 N( M0 \) w  set roads patches with+ q! [4 H9 @+ Q& U. i
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
0 D" o, W7 `% i/ f5 k7 F) ]5 P    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]. a9 J3 S# T, L# P  W3 O
  set intersections roads with
5 S0 b! S0 R7 o    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
) P- K6 \* i' _2 e& Z5 S# S    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
6 i9 }& I2 ~" f% D* z- t6 q2 W: ^) \; n) y+ Z* U+ j. |
  ask roads [ set pcolor white ]2 a' l- U, g3 }8 F
    setup-intersections
. J% l& A. m  ?; W) t! wend# y9 ^8 K0 k3 M( ~2 T& [8 _8 a
其中定义道路的句子,如下所示,是什么意思啊?
' s! u  z( J! D7 H0 g1 X" q7 k set roads patches with
( ^1 u, W8 S& A5 n4 x; ^4 _    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or! `5 r: w) g% O
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]( Y8 h2 e5 i, ^7 K+ J4 ?+ `& P" H9 B
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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