|
|
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。
1 e- [% g* G4 O) w% `netlogo自带的social science--traffic grid这一例子当中,& c& c5 B+ S8 f1 G1 s0 ?
globals4 x) h8 l2 F. p
[. N4 [/ N z+ Q2 |6 T
grid-x-inc ;; the amount of patches in between two roads in the x direction
, L) g8 s5 _) o& Y3 C( ^ grid-y-inc ;; the amount of patches in between two roads in the y direction
5 E! t: E* B" E" N; {8 l acceleration ;; the constant that controls how much a car speeds up or slows down by if
. h0 G8 t9 E- z) h6 K ;; it is to accelerate or decelerate
! ~0 R. {3 {. l phase ;; keeps track of the phase3 c% E% ]7 w/ D' _ E
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
2 G% t+ `4 D* v current-light ;; the currently selected light6 G [# d* ? Y' h
# e, F+ ~8 q, c* ^: b
;; patch agentsets/ ~! k7 {+ q; H* {( z
intersections ;; agentset containing the patches that are intersections
. b1 E: W+ \$ N3 y# i, o% ` roads ;; agentset containing the patches that are roads1 N; S* b0 l1 b( |1 u8 O
]
2 h, X( Q7 }1 T
4 H0 x {, R4 m5 X9 N2 N z2 Wturtles-own
; R9 }2 p0 n) E8 H8 \[/ u N* L5 a D6 i& Y
speed ;; the speed of the turtle8 I m5 d1 h$ T" S& \
up-car? ;; true if the turtle moves downwards and false if it moves to the right* X( Z- ]2 H& l+ h! O# F4 W
wait-time ;; the amount of time since the last time a turtle has moved5 }* X% O( N1 |" s# x
]
3 u4 _6 {% i' W& m' o7 b" O
+ @, {; ^& N# [+ u' i# Z% vpatches-own: e1 P. `/ s: p2 z' c3 g
[
4 x0 y& ^ ~2 _: W" |8 X intersection? ;; true if the patch is at the intersection of two roads+ u' N) u2 p. Y* B4 h8 |' t
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
6 h# c$ A) q& M I& G$ t7 t ;; false for a non-intersection patches.; E3 }& |. F8 ^
my-row ;; the row of the intersection counting from the upper left corner of the
2 U7 R' g7 K: N9 f1 q5 o ;; world. -1 for non-intersection patches.7 w6 `2 Y, b: r/ u/ ^
my-column ;; the column of the intersection counting from the upper left corner of the
8 u4 W# e) W8 ^ U0 X ;; world. -1 for non-intersection patches.
' j1 J s1 F) T0 n' j my-phase ;; the phase for the intersection. -1 for non-intersection patches.
. G# C. G. ^$ {- p auto? ;; whether or not this intersection will switch automatically.- z/ D, l* r3 Z
;; false for non-intersection patches.7 y( J9 m: L1 o
]
9 w9 ]9 D6 h2 ? L7 l- C
0 a' R& ?# r! ^2 s9 w9 e& y9 P% k3 Q. H; P$ ^* Z0 Y7 n9 g/ i
;;;;;;;;;;;;;;;;;;;;;;
+ w4 r8 r/ n) B* B;; Setup Procedures ;;
$ J% v, K$ w5 e; b7 F/ h* \4 z W;;;;;;;;;;;;;;;;;;;;;;" b6 l. D) H# s l* ]
8 Q+ O' q4 K# @/ p m( j2 }0 Y
;; Initialize the display by giving the global and patch variables initial values.
8 P0 f9 G' D# `;; Create num-cars of turtles if there are enough road patches for one turtle to
9 ^4 ]6 b' x9 ~# _$ @;; be created per road patch. Set up the plots.
# r& \4 F! S9 a, lto setup
# U! k3 C1 ^* g& d+ W! `% i% Q/ | ca
" O# Q: E1 | d j; Q6 b$ o' ` setup-globals
3 ^4 y! E% G& N7 d8 X7 C) ~0 p6 V8 J+ {# W, ]
;; First we ask the patches to draw themselves and set up a few variables* Y- q) A2 `" H, t% P$ }, t
setup-patches7 {, I' S) \7 R# h7 v* b4 B9 h# T
make-current one-of intersections# J) i7 t2 T+ V' W7 p
label-current
# E) [* h ?, C. K2 t: t1 T( Y7 h- U7 P+ x9 |7 m9 ~9 W, C% @( ^
set-default-shape turtles "car"
- O# j- e2 r/ `4 D% I! Z) T( e; I& s' r# E
if (num-cars > count roads)5 ]+ X$ o8 S; Q; ]! Q! S
[
. \. i& z$ Z' G; ? user-message (word "There are too many cars for the amount of "
3 S4 }" ~* N5 L: K/ W9 h "road. Either increase the amount of roads "1 H! z4 G0 b0 p$ S- K D
"by increasing the GRID-SIZE-X or "
8 e6 u# X' V$ u6 k "GRID-SIZE-Y sliders, or decrease the "9 d2 x4 E) g& B1 v* W
"number of cars by lowering the NUMBER slider.\n"2 R; X$ q4 N6 ?9 G/ ^2 ^
"The setup has stopped.")
+ k- x' m7 F5 _! E: D stop* n1 E* U: h$ p+ y) ]( v# `- y' z
]! q- e3 O# o% n: Z2 Y9 t: B3 J, u
: T+ j1 K9 R( r; t O' ` t
;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color( q I$ X/ M& V! _/ j
crt num-cars/ @" O! f* C: q) C! m) W( H! D
[
/ D0 N( b9 s, i9 Q& u setup-cars0 Y7 o l% A4 r g3 [# I
set-car-color
% d$ F! k7 [/ c# ? record-data
: u3 ]4 ~ ?* G2 d; @7 b/ k" Y ]
8 e# G: ~* [' H, p C1 b
B" z0 n" n+ y ;; give the turtles an initial speed
6 X" V' H- c) c0 G ask turtles [ set-car-speed ]$ h8 H6 A0 |( k8 K6 a {
% ^/ q* \1 [& A( @
reset-ticks. l. V2 U$ f( D% l7 |3 @( T) w
end
/ @, a( e( F% V4 h3 g
2 w3 F# c/ R9 t;; Initialize the global variables to appropriate values
; O3 n( E1 _' j: `2 ^to setup-globals0 p2 D% U S6 N& a
set current-light nobody ;; just for now, since there are no lights yet: a3 a) A- Q6 T5 Y
set phase 0
* e3 g; @5 I- Q9 y7 B$ i set num-cars-stopped 0$ p7 R3 N+ J+ B5 t) w5 Q
set grid-x-inc world-width / grid-size-x
& Z6 U. c: E" i( G3 c- _ set grid-y-inc world-height / grid-size-y( L, B! l. d' R1 S0 y3 L
- ^+ H0 ]1 A2 K2 f: @9 L: B
;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
6 R; H! z& p: }6 j/ l set acceleration 0.099, g" c7 I. U! q, u
end
$ Q( J5 q- ~$ a7 {; {! i5 A ^" a) x9 @/ E" z: O
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
/ S4 f' s: @2 [+ v+ M) {;; and initialize the traffic lights to one setting1 k6 L# s. t. ^$ a4 |6 I4 J
to setup-patches! N# m9 b# q0 n* F
;; initialize the patch-owned variables and color the patches to a base-color3 [/ s0 K" ` X) h7 N; h u
ask patches
) F6 w" k8 B9 F6 C8 {: S# R [
4 k( h M! N1 @ \! f+ n- ^7 H set intersection? false
0 \* S# e/ R# {2 b# J& t4 P# g0 X set auto? false' v8 h& H9 C2 F. R
set green-light-up? true
" m1 E G) `1 i5 n set my-row -19 U" Q1 q9 j) b7 l/ |4 U
set my-column -1( v3 `! |4 V0 O% ?
set my-phase -1" H+ i8 Y9 [; N4 g6 q" A
set pcolor brown + 3) E8 G8 X8 k+ W) D8 c: W; Z
]
I! H: i' Z# U1 N2 O3 J) p
" q$ t/ r! b4 o* V, Q1 z ;; initialize the global variables that hold patch agentsets, ?* Y( W3 c7 n: Z: @( ~0 ]- r
set roads patches with' b4 k8 ^1 e# Q! H
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or ~$ q6 P1 v: r7 v3 c
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
: g+ z9 Y7 ^4 f5 \ set intersections roads with
4 G9 e# i# N" `$ c1 v( }7 V [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and; u3 f7 }3 }! G7 {9 W
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
* v6 Z' r+ `8 P6 V9 R( G' P7 m2 c! l4 s( r
ask roads [ set pcolor white ]
$ X* i' j) R8 E setup-intersections4 ?4 f( ^% P; J* T
end
% e/ b4 b& J8 W其中定义道路的句子,如下所示,是什么意思啊?: {, X, @ M! t# I5 A5 t; J; u0 h
set roads patches with
* D& b% b' F* H6 T3 t& u( u* m [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or$ e3 u4 \7 R1 D1 _8 N2 I/ I
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]# d" i; V! c7 U. ~: c6 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? |
|