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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。3 e2 ]) Q* F) m
netlogo自带的social science--traffic grid这一例子当中,
: b/ N* |( e# T0 l0 eglobals
5 `; k3 a3 Q4 |0 @2 a8 R) u) W$ b3 I[
  F" l) @# E8 o4 W' I- L  grid-x-inc               ;; the amount of patches in between two roads in the x direction
$ n+ g3 z( x9 @! Z% q6 }  grid-y-inc               ;; the amount of patches in between two roads in the y direction
" @7 n# h- m0 F8 _2 [. u# W  acceleration             ;; the constant that controls how much a car speeds up or slows down by if
; D  G) J5 q6 w; \                           ;; it is to accelerate or decelerate
' b( K8 E3 @5 W. t  phase                    ;; keeps track of the phase
3 ?/ X4 M: q& y/ t  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure
0 w9 m' d' _2 o$ ]. p  current-light            ;; the currently selected light7 s$ j" _" b3 x4 y9 S1 s: s
& M5 d1 x, o, x* E; w4 ^/ z8 C. U
  ;; patch agentsets
: u& C8 V! N- \! e5 Q+ W  intersections ;; agentset containing the patches that are intersections3 y  S" ?/ q( ~1 V* Y/ {
  roads         ;; agentset containing the patches that are roads
( u) }( ^' l9 J0 D8 d]
7 \* ?0 R& P" M+ |, s
3 D! [2 X  x/ a4 S5 o+ Z- bturtles-own
: R" M8 \/ s* Q  a; y% U6 n! U[
  [; S3 q) T3 v  h$ U/ U( i2 r  speed     ;; the speed of the turtle
" i* h& z: M$ X- y  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
& B! `) Z$ T) d! K+ ^7 G  wait-time ;; the amount of time since the last time a turtle has moved
* F7 z0 v$ K  H4 C1 b]
3 O5 s1 W4 f' m+ L/ b; s  S/ |  I8 X
patches-own
8 O* h/ P8 u# [9 J[
4 t+ c( E2 c2 c5 z5 Q  intersection?   ;; true if the patch is at the intersection of two roads
- f5 m; ~% {# c- n" @9 ^1 }9 ]  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.( ~: }2 M9 Z0 I( F2 Y6 n
                  ;; false for a non-intersection patches.9 K5 v4 l: s0 B9 f0 y, i
  my-row          ;; the row of the intersection counting from the upper left corner of the( N' |( C9 k1 q0 u0 A. {
                  ;; world.  -1 for non-intersection patches.. ^9 ~" R3 w1 |! e1 x5 O
  my-column       ;; the column of the intersection counting from the upper left corner of the5 o. ^- a7 D3 ]) Z9 g9 L
                  ;; world.  -1 for non-intersection patches.
# k  f) P4 W" {! z1 \  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.
; }: W- Z) R' k, G  auto?           ;; whether or not this intersection will switch automatically.) |8 b$ N( Z* p& D0 F" Q2 U
                  ;; false for non-intersection patches.' V0 Q5 P. a- {, [. X# _' c
], z3 B! T& s9 c: ]/ _8 ~

: o7 s7 w3 V1 \8 I0 _$ l7 m- g0 \' W- ~, o
;;;;;;;;;;;;;;;;;;;;;;
- B5 m5 f" i$ \& };; Setup Procedures ;;) K1 P0 u0 J/ F, }& e7 x8 o0 f. X
;;;;;;;;;;;;;;;;;;;;;;* v  A  e8 d4 {- j0 w, a

- ^+ c  K5 ^, j( o  ^# S8 H7 P;; Initialize the display by giving the global and patch variables initial values.
: @/ A/ T) ^( ^6 d% t( K;; Create num-cars of turtles if there are enough road patches for one turtle to) O3 j$ E; Q5 U- c
;; be created per road patch. Set up the plots.$ ]; a& \4 T& c2 j$ r
to setup
0 w" ]$ m# ?! {9 m  ca
" _4 Q) x5 l/ i/ B& z( k  setup-globals
- m# E8 W! J. p' L" o1 O+ j
' U( c! B- }& R  ;; First we ask the patches to draw themselves and set up a few variables
+ I+ l' i1 g4 A6 o; k  setup-patches
4 j( y* W% a( W- d  make-current one-of intersections
, k( m4 \0 [; e; x+ P0 t$ A  label-current
6 v+ R, V( m$ K$ L  B" A' T' G- p( p, t) O7 f
  set-default-shape turtles "car"
: z7 a- |: ~5 R, ^4 I1 |* @# F" l/ l- D3 d$ h( ^
  if (num-cars > count roads)6 [' n4 l3 a# [
  [
. M" P" X. O7 c# l9 P9 G8 b    user-message (word "There are too many cars for the amount of "
0 r5 j4 g3 a" [3 M7 t2 b" f9 w# i                       "road.  Either increase the amount of roads "
! n8 k4 ?4 b1 ~8 Y8 m                       "by increasing the GRID-SIZE-X or "
. A. `5 e7 Q4 S$ ?4 @1 A                       "GRID-SIZE-Y sliders, or decrease the "
- Q% C% l. j  E& k8 o4 y' ]8 z                       "number of cars by lowering the NUMBER slider.\n"& S$ g1 G+ P4 A0 E/ c: H) n
                       "The setup has stopped.")5 g7 e5 j) I! k7 e' y& g+ |
    stop* Y% K) D4 W1 `5 }: ^6 z' C
  ]! T4 |& d# `0 Z# \6 ]1 b: t

, z5 F  q) W; c  z1 a7 u4 q8 a7 K  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
  E7 G" A& f3 h- s) J- T6 @  crt num-cars2 {8 O" |9 u+ y' e& n& W2 W
  [
( Q0 S6 j1 p& Z4 c- y/ s& h    setup-cars2 o" v5 G, ]5 {7 j3 _* K) D  L
    set-car-color
* Z! u1 M* |; K8 u$ s; i# ?2 W    record-data  e& S( W0 m6 W/ S1 {
  ]
  F- U3 k- ~1 Z6 `3 E. V
4 B9 p8 U1 N% M+ E) l  ;; give the turtles an initial speed" Y4 {5 X6 _2 H: s7 c
  ask turtles [ set-car-speed ]3 m1 l% B+ U% W, q
7 D8 b3 L8 ~  g; j# y
  reset-ticks
5 }+ y: [4 K* E7 k/ vend
- ^& c# [9 P/ @: W, S1 Z8 z) u) i0 q5 t  k; B
;; Initialize the global variables to appropriate values
3 c, n) A& r  u: I- o! F) ^to setup-globals
& @9 c: l8 F  f. }  set current-light nobody ;; just for now, since there are no lights yet
1 v' R' H0 B" i" ~% \+ B! d  set phase 0; O* ~; j+ v" v% Z( @7 O7 ^
  set num-cars-stopped 02 `0 r0 N3 R* z8 K  l( e
  set grid-x-inc world-width / grid-size-x: i: B; k! ^0 M
  set grid-y-inc world-height / grid-size-y
. W1 a: x/ c. y! c- a! V1 `2 h( D! n% R5 e
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
# C% i. ]& V% ]! v- _- R! j  set acceleration 0.099
* S( P7 c; b# D$ k6 @5 i$ Uend/ l9 C# \. r' U: ]5 r% I: |
1 z# E. g5 s3 Q, J5 x! @3 m
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
! v7 o$ w; t. z! R: H! y;; and initialize the traffic lights to one setting8 T( D! j  I7 g' w& A, l- U0 @
to setup-patches. B9 `/ y0 q0 M* o8 j2 x& u& n2 P
  ;; initialize the patch-owned variables and color the patches to a base-color' _  ~+ M8 }* w
  ask patches4 d6 ^/ {9 ?3 O' q, [
  [  P* z5 e/ F/ Y
    set intersection? false1 F, R/ e$ j* U
    set auto? false: N  B5 V2 N; X
    set green-light-up? true" _" r% y( s( O( U/ {+ l
    set my-row -1. }8 n/ m' n! {* [: a
    set my-column -1% Z: Z$ W, ?6 [8 M6 n
    set my-phase -10 [3 l( ?4 v0 ]2 x+ Y7 g
    set pcolor brown + 3
( X% p* D. ], q- I9 T5 i) U  ]
# W# k) M4 b9 ?9 r9 B3 s1 f
0 |( X$ a, ?6 M: M& T* u# r$ ?  ;; initialize the global variables that hold patch agentsets
. C0 S2 p# a- b. g+ D( _) A/ l7 W  set roads patches with
' ]* t" N' F* V/ M4 @  n    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or. e- T8 j* y; I7 W
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]2 f# f0 U, A  z7 l1 F% Z
  set intersections roads with+ P. j9 h# L1 W  G
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and" Z) w; b1 t! `# I: O
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
4 C+ ~' T1 P  Q$ i" e0 \1 T& P* T2 c9 L8 H# b$ v: {% Q2 U# D
  ask roads [ set pcolor white ]
. A7 [2 a5 E, \& R3 W) @5 E0 Z1 M    setup-intersections
5 E* ?/ {* |( M2 [5 v* @$ cend2 N- B$ u' i: k3 i; ~
其中定义道路的句子,如下所示,是什么意思啊?
) H$ f  a0 [2 o7 x- s4 J+ I) E set roads patches with
  B* Z  b2 p/ V/ s5 P- n4 F" B+ R    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
0 N! T$ Q, ^% k; w/ n8 c' g    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]( n) `# G9 v0 c! D/ y% N! ]0 S
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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