设为首页收藏本站

最大的系统仿真与系统优化公益交流社区

 找回密码
 注册

QQ登录

只需一步,快速开始

查看: 9991|回复: 0

[求助] 在看例子时有几个问题看不懂

[复制链接]
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。
; n7 Z* v2 `3 f2 q. {netlogo自带的social science--traffic grid这一例子当中,, j( s: N0 ?/ h, v
globals: z& @/ e/ B- P% i" o4 b
[
4 `6 y/ g; \7 r! W9 q  y+ a  grid-x-inc               ;; the amount of patches in between two roads in the x direction  z. P7 e& n% Q8 m' F( N6 j5 U( K
  grid-y-inc               ;; the amount of patches in between two roads in the y direction
! e- X" ~0 |% T- D. K  acceleration             ;; the constant that controls how much a car speeds up or slows down by if* o" w# T5 H; a$ s& V
                           ;; it is to accelerate or decelerate
9 u, \! H" g  o$ r$ E  phase                    ;; keeps track of the phase0 P, z" L. l0 J
  num-cars-stopped         ;; the number of cars that are stopped during a single pass thru the go procedure4 m- e4 ~# u7 R  r* z2 w$ A0 F
  current-light            ;; the currently selected light
  S/ f% R7 ?" ^: ?8 C% S# I0 g# K9 [) @
  ;; patch agentsets
) F) g" |, _0 L5 z4 n5 Z  intersections ;; agentset containing the patches that are intersections
0 I  [: m7 W' ^/ W  roads         ;; agentset containing the patches that are roads
* W- }9 z8 L; D]
! A* Z; K  h& H6 W. y# n9 d+ a
; e  G" a! t, o$ K# b  T8 V- B+ mturtles-own
0 c# U7 S6 T4 ~( Q( O6 p[
5 B7 l! T7 t4 ]  speed     ;; the speed of the turtle! B5 Y% Z' z8 E+ A! c
  up-car?   ;; true if the turtle moves downwards and false if it moves to the right
1 c$ s) j* N. }! T  wait-time ;; the amount of time since the last time a turtle has moved
7 j# n& a4 t9 n3 j4 b! h1 j]
2 B. W: b; X6 F. o$ L9 C
% S. p* b# T% F+ e2 p1 z9 Apatches-own
1 k  ?& t$ ^, b  |[
( R) p1 j$ ~0 k5 S6 {  intersection?   ;; true if the patch is at the intersection of two roads; G& R% y4 D/ g9 S
  green-light-up? ;; true if the green light is above the intersection.  otherwise, false.
" |" b: C& C1 s                  ;; false for a non-intersection patches.
. Z8 f3 {6 v/ @% w+ p+ [  my-row          ;; the row of the intersection counting from the upper left corner of the
0 L9 y2 V( l, l! H8 U                  ;; world.  -1 for non-intersection patches.3 h9 b8 d% h4 d5 N. V9 K' {
  my-column       ;; the column of the intersection counting from the upper left corner of the
' T  h% o0 x* Y6 n& n                  ;; world.  -1 for non-intersection patches.
/ o3 E: E4 ~7 t1 ~! I  my-phase        ;; the phase for the intersection.  -1 for non-intersection patches.5 D9 |& R/ @) R' ?* R" B
  auto?           ;; whether or not this intersection will switch automatically.; I# |7 N- C3 ]# m  ~# Z) W
                  ;; false for non-intersection patches.
0 \( G# W$ Y$ o% T]
: N8 B: l! ]% D0 \3 M% Z- V+ o& B& T
8 ]# k$ \& r' Z6 n8 [" H' g
;;;;;;;;;;;;;;;;;;;;;;
8 {5 a7 J- y" E# o- k. t+ G0 {; H;; Setup Procedures ;;" I( W6 X0 N. [2 a- C: [; u
;;;;;;;;;;;;;;;;;;;;;;
6 W1 `3 B* P4 s/ P  y$ V3 Y1 E. y; D! }& |& `$ Y" s/ V
;; Initialize the display by giving the global and patch variables initial values.
6 b6 G  f5 g8 ~, G( ^;; Create num-cars of turtles if there are enough road patches for one turtle to
; H8 F! B. v$ P2 t3 k% F;; be created per road patch. Set up the plots.- Q% Y) P/ y! x0 x4 @' w7 @
to setup; K2 m! ~4 }/ F& g, l8 T$ s) p# {0 ~
  ca$ A: j$ ]' R' r. a8 R* Z9 u
  setup-globals
  V. r$ Q: R7 a+ G/ v5 t( H+ Y9 \1 w8 M* P' |  O/ ]2 @. d& P7 [) a9 Z
  ;; First we ask the patches to draw themselves and set up a few variables
+ w, a3 ~" O: q/ P- x1 b9 g  setup-patches* Z( p3 Z1 ?4 G8 v6 i
  make-current one-of intersections' G$ w: e6 o9 V
  label-current& N1 G; ?* D/ N6 H% T- T" d

  F9 \9 `2 a0 P9 e2 E% y+ n" L+ h  set-default-shape turtles "car"
, y% G2 o$ H4 h
. j8 C2 p$ J' Y2 l  if (num-cars > count roads), Z6 y- N! p7 P, V
  [
4 s7 k+ }" i8 g/ i    user-message (word "There are too many cars for the amount of "
, S2 I* B3 w; V# c4 ]                       "road.  Either increase the amount of roads "
( p) I) L% s5 h1 |0 y, g                       "by increasing the GRID-SIZE-X or "# j; {- R: [! W8 o7 b
                       "GRID-SIZE-Y sliders, or decrease the "+ {' J, q5 g6 Q. f0 ?2 q/ D& x: B
                       "number of cars by lowering the NUMBER slider.\n"/ \1 N: V" @. o! S. C
                       "The setup has stopped.")5 S! R0 ~: L! f# ]" t0 I1 y) d0 w
    stop" X: z6 |! `, Y  W6 R( M8 w# F
  ]# a1 ?1 {6 n" e1 q; m
3 W; h+ @2 [+ `3 C
  ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color/ ~# y) N5 u7 q6 _  \9 |$ i
  crt num-cars9 B! P2 B  `4 z6 t
  [& }6 z/ w) Y0 H+ D* j* a$ m* y
    setup-cars. G" c" a4 o- b
    set-car-color
, G! G9 S3 F( O: t2 v/ C: {    record-data
; k5 j2 g$ B& L  E. S  ]
- y. s7 i! u9 \5 `' I0 C
' q" v/ m4 v2 |0 {7 T  ;; give the turtles an initial speed
/ N0 e5 M6 J0 D2 I) @/ \  ask turtles [ set-car-speed ]' Y% L7 U# o& n& C
3 q, Q- ~( ?, V% Y* I
  reset-ticks
. z' B1 H3 Y) o& Oend9 F" u( A; R8 [# p/ L4 o
" ~! u/ U0 ?# B& l2 ]# ^
;; Initialize the global variables to appropriate values
: w  J) m4 f5 }$ t! Pto setup-globals1 V: n, d) K2 s0 x# L) ~8 f5 x( A3 N
  set current-light nobody ;; just for now, since there are no lights yet
% _2 ~, A7 I1 x' z7 @& q  set phase 08 b" J2 ]/ c' {( ]
  set num-cars-stopped 0, l, g" T& {) W6 @4 L- C2 h5 E
  set grid-x-inc world-width / grid-size-x
8 S- d; M$ w# a8 P6 v  set grid-y-inc world-height / grid-size-y1 {- _6 d+ a+ S; p' u: A
) ~0 ?2 l3 Y* n2 v- U7 a: L; R
  ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
: M; c- Z( W5 d  set acceleration 0.099( i( }( n. V: z# l. z
end/ {6 C) O4 c- F  E: i
) b* M/ B+ q  f6 g0 E
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,: ^& E* a, z# [* p7 ?2 J" d
;; and initialize the traffic lights to one setting
5 ?- s9 Q3 @9 p9 x" e) S- T& I: s1 ?to setup-patches
" e) g+ U* J9 I  v  ;; initialize the patch-owned variables and color the patches to a base-color/ l- d( i. L4 D- [) ~- l: S
  ask patches
& I6 M2 E& N# X* T$ t* B  [. j7 n, a, G  A
    set intersection? false$ [1 a$ ?9 I; \7 ~! q& y
    set auto? false
, U" G2 a$ E' K6 h    set green-light-up? true( }) `# ?/ k- C( ^) c4 V$ H" ?+ _
    set my-row -1( B8 f2 l! |( I8 M7 F( b3 m  |0 H; O3 I
    set my-column -1
1 {2 Q( q2 Y: x/ \    set my-phase -18 z  J9 c4 z2 V6 a' i. h9 ^( C0 X
    set pcolor brown + 3
5 g* ?) J+ w- Q8 D9 A. _  ]
7 j, j8 g! t; r$ I4 @; k% C! n
% M3 n6 \5 |/ s8 E1 n  ;; initialize the global variables that hold patch agentsets! M; ~1 @8 D  J  [
  set roads patches with4 \- x* A" O6 T' G  }' A" Q
    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
! _2 g1 D% y# y  ]9 U7 }    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]! c' Q" p9 b0 G! O9 m" H& T
  set intersections roads with
, j2 C9 M- @5 J    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and1 Y+ g4 Q, q0 a" F. x+ N, E
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
& O) k7 D* d0 |6 \' l5 O
# z' U; ]( k! Y; }6 T+ l2 K. V  ask roads [ set pcolor white ]* F2 e2 q, b+ ^% h0 b6 V
    setup-intersections
  A3 e$ q5 U! s6 uend
) z' C: E' y/ a' Q+ {4 R其中定义道路的句子,如下所示,是什么意思啊?
* Y/ U, G. Z2 X$ D& n& e$ D set roads patches with
/ x; V& z4 B- X, z    [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or; M4 l! k9 t9 j
    (floor((pycor + max-pycor) mod grid-y-inc) = 0)]* r" J" s7 n' x
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?
您需要登录后才可以回帖 登录 | 注册

本版积分规则

QQ|Archiver|手机版|SimulWay 道于仿真   

GMT+8, 2026-5-10 10:03 , Processed in 0.019627 second(s), 14 queries .

Powered by Discuz! X3.4 Licensed

© 2001-2017 Comsenz Inc.

快速回复 返回顶部 返回列表