|
|
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 x3 t. F! @& R# b4 V) R# E1 x
netlogo自带的social science--traffic grid这一例子当中,, W6 y' F. t0 [4 M7 [
globals
7 ^& S6 u( I: k$ [" S: q+ p: n[
/ G2 d; o. |% V3 l; u2 R grid-x-inc ;; the amount of patches in between two roads in the x direction
7 ^" b Q9 r3 R/ X- z& ] grid-y-inc ;; the amount of patches in between two roads in the y direction
' G' G A& A* q6 I acceleration ;; the constant that controls how much a car speeds up or slows down by if
. r8 b* n/ B, t5 Z7 [0 ]: Q ;; it is to accelerate or decelerate
, v4 z9 l) q# q; Z phase ;; keeps track of the phase5 o, y$ }0 x% |* B2 X9 U
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
; s5 m, B u+ `6 w! C current-light ;; the currently selected light
+ R4 I; n* c* o5 g0 f# ?$ O' t! @
* O/ O) A8 h+ l8 s. V( n% c ;; patch agentsets+ [! [- o% \; B! @& ?0 v
intersections ;; agentset containing the patches that are intersections+ t1 d2 C2 l$ I3 q% W
roads ;; agentset containing the patches that are roads
" q$ z! _6 W$ U! L% r" y/ p. F]" z' I$ V( a/ x" }* i
$ d( T" H/ g/ v. Iturtles-own/ t$ }- R8 t" N9 [) z
[
5 ^3 x3 |" n* j+ i" @ speed ;; the speed of the turtle8 z- V4 Y: R; q8 A! d$ N2 l) n% M
up-car? ;; true if the turtle moves downwards and false if it moves to the right4 w9 C. @, @# U& z3 j+ W2 _
wait-time ;; the amount of time since the last time a turtle has moved7 H" k6 t! I& G9 Q7 ~ O
]
8 N. v c" Z p, v; w4 @
# S, P' p( s7 e- y% X4 \$ @patches-own
- D1 y1 W$ n& N% j/ @[9 x: u! p7 u/ ]3 j0 o& C! }) `
intersection? ;; true if the patch is at the intersection of two roads
, N- m# G) @( G- v: C5 ` green-light-up? ;; true if the green light is above the intersection. otherwise, false.; ]& Y$ Z. i" d5 k, [" ]
;; false for a non-intersection patches.
Y1 ?* c. J- L `/ Y my-row ;; the row of the intersection counting from the upper left corner of the
# z( e) B% f8 G# ]! B+ W( L* o ;; world. -1 for non-intersection patches.
1 s& w! E( e8 J3 \3 `+ n my-column ;; the column of the intersection counting from the upper left corner of the+ K8 s% W, L- K* P7 t t3 b
;; world. -1 for non-intersection patches.6 ?1 O% z) g9 [7 p
my-phase ;; the phase for the intersection. -1 for non-intersection patches.& F# f9 {) O, m3 e* p1 @- L
auto? ;; whether or not this intersection will switch automatically.
) G6 _' I" e* w% H5 O* w6 L ;; false for non-intersection patches.) T) h& R0 w2 ~% \
] E5 Q- e0 G' d4 f' [$ f7 K
3 p+ [4 x8 K* m7 [0 j8 H
) r7 i) y+ x$ T; U' Z2 F
;;;;;;;;;;;;;;;;;;;;;; U1 A+ G, j& u( V3 D; u, G1 S
;; Setup Procedures ;;4 |! _. Q3 Z) @( a6 `$ {: Z0 a
;;;;;;;;;;;;;;;;;;;;;;: V3 C0 i; g! ~: f# S/ d" l7 D
- H: F( r/ a7 v. |* j' ~1 h0 G;; Initialize the display by giving the global and patch variables initial values.
8 O7 H9 @5 ?2 f, E% p5 v( @;; Create num-cars of turtles if there are enough road patches for one turtle to
2 u. X; w. f# q4 e0 ~8 u;; be created per road patch. Set up the plots.- w h( t2 b9 f! I. q+ D
to setup/ [8 w# n2 Z$ _0 z% n
ca7 k: ~9 I2 |5 a1 x
setup-globals
; C* [* v$ l! {+ c0 `6 o+ S: l
;; First we ask the patches to draw themselves and set up a few variables
) m) r) R9 Y' N6 C, r/ p! B% Y1 y setup-patches
% {" t$ D/ c- w6 d make-current one-of intersections# S" ]' t4 l5 Q+ d
label-current, ^" Q" [' C( o( \3 g1 C! w
7 c: d2 y9 K3 K ?, G) O2 j set-default-shape turtles "car"# r: F6 H- X2 C
3 Z$ N$ a# B9 u! i6 s if (num-cars > count roads)* Y* w% g1 i4 } r
[
# O( o3 H, g$ m- S user-message (word "There are too many cars for the amount of "
8 d" j1 Z; X- c& u "road. Either increase the amount of roads ", b/ ~2 N/ M' C+ {; G, ^
"by increasing the GRID-SIZE-X or "7 N: Y. p2 ^8 n2 X+ R
"GRID-SIZE-Y sliders, or decrease the "$ L: l& ]9 Q* g! k! S
"number of cars by lowering the NUMBER slider.\n"* c( D0 n7 c, y; j! P+ r9 A& k8 G
"The setup has stopped.")
) ?0 h" C( H6 c. ]# P! k stop
% V4 a8 X; s% M$ ~- w ]
" H, C& T' j9 b
0 W" J1 C- ^' z8 E/ \7 r# X ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color" k$ r6 \: l' i: z; k% a; X
crt num-cars
* \5 C- k3 j8 ?0 U2 Q0 G [
& o, g+ v) c! [! i8 h1 H6 Y setup-cars
) p3 Z9 R. N. N3 l' L) b6 h set-car-color
( B/ v4 f8 u9 `6 B: F$ C record-data1 l6 n* J$ s, X
]
% O! o7 o4 {6 s; M) h0 X: w0 R v$ K& E" K2 a0 l
;; give the turtles an initial speed
3 i ]2 u! Z; O7 K ask turtles [ set-car-speed ]
/ ^6 O, E& \( w( f) b2 A* k0 L- W5 ^& N J) {
reset-ticks
* I* n" N! k& q) Bend. F4 ?' K: ]$ h. x0 O3 [
8 W! J4 U) r/ `* Y4 M& X- @
;; Initialize the global variables to appropriate values( I) E+ U: H' ]7 W) u3 ]' Z
to setup-globals
+ f6 X& B' C | L7 ?/ J" o set current-light nobody ;; just for now, since there are no lights yet
$ e0 Y" I. e' r' c2 j- c W& a set phase 0
4 G- i4 @3 l& G9 e set num-cars-stopped 0
$ C/ x0 ^7 o1 X9 \8 }8 s$ Y2 p# v set grid-x-inc world-width / grid-size-x
( E/ G# u2 j# n3 X$ Z) ?) C. L% F. L set grid-y-inc world-height / grid-size-y/ P4 v2 f D8 d
. H: m# Y9 Q9 f1 Z8 ]. t# S* P ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
! C9 @2 k" v+ D( e# R4 T set acceleration 0.099
6 r2 K* T. j5 m8 bend2 }/ M! g! F# `, s7 n5 M
0 g2 |6 i# F2 E. J;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
2 y+ _) u( v' g: Q7 I( d;; and initialize the traffic lights to one setting
) ^% o" I: @/ e* Q' Oto setup-patches0 S! g: n: x5 u' |, M3 x% e# Q
;; initialize the patch-owned variables and color the patches to a base-color
+ R5 e. }) `: K; N$ ]) X* H ask patches
# y }3 R l; {! t& _ [
+ u6 a4 E! \5 _% E# y set intersection? false5 G5 \6 d& o8 g1 d% x7 ]% x
set auto? false! v( n- O6 i8 i c3 W3 a( e2 d
set green-light-up? true
1 r! ]& Y7 F1 B3 w- O7 O- P* ~ set my-row -10 ]. S* M. F; l. R
set my-column -1
7 Z( P/ z5 x3 S4 R B- H4 b! A set my-phase -1" T1 ^, p( F. W3 v0 t x" m3 m7 ]
set pcolor brown + 3: Q1 L4 p6 n9 }$ w. u
]3 T/ [5 B6 Z( e
0 a' z& B3 t& B) y
;; initialize the global variables that hold patch agentsets
/ Y- I! N# J) ]0 A( L. @5 } set roads patches with1 h; e0 L$ D3 n s
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
$ h* x, S5 P9 O2 O (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
3 {; o4 s( \! G* F5 ?) ]$ K set intersections roads with8 q' l8 i$ `1 l# V( O; ~
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
" g/ U9 E! a6 @! c) y' \ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]- ?5 P4 g; x1 M+ {4 Y" e+ f
- ]1 H& t) g9 T3 V
ask roads [ set pcolor white ]
# Z9 }4 r m M5 T7 Y setup-intersections
9 N1 Y$ u+ ]/ C) V; p& S) M, `end! D$ a. f% }$ f+ G7 I! E- f i. L6 [
其中定义道路的句子,如下所示,是什么意思啊?2 I7 w( ^4 A, s3 U$ g
set roads patches with4 [/ B8 I+ O: d+ v. J6 V
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or3 A7 ^0 N* h$ J3 s) Q, I9 ?
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]! f1 ~& L' I- _' M5 M
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? |
|