|
|
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。
% f0 d* j5 y0 c0 H1 F2 bnetlogo自带的social science--traffic grid这一例子当中,
3 s' o! m* k1 V$ _/ I+ Q$ r6 @globals6 _1 h2 k3 z$ w' i7 F5 |2 J
[* s3 N9 x- V* K% O
grid-x-inc ;; the amount of patches in between two roads in the x direction9 r) Q) L- {7 s5 P9 O3 e
grid-y-inc ;; the amount of patches in between two roads in the y direction
# h" D; A4 \( f: F: Z9 c: @ acceleration ;; the constant that controls how much a car speeds up or slows down by if* X; h- S. c$ Q' c2 h p3 {% w3 r/ i
;; it is to accelerate or decelerate. b- w9 Z) o# O( j, _' W9 f
phase ;; keeps track of the phase0 V, g* E; `9 \0 |
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
! l6 f9 q% D. w current-light ;; the currently selected light
& M& G2 Q+ Z \+ E7 Y/ p7 G2 h; B2 C1 _( s* K" B) x% u2 [
;; patch agentsets
9 m: @$ T7 U6 A) u& Z, M intersections ;; agentset containing the patches that are intersections# k& h4 c% J/ l |' [0 _
roads ;; agentset containing the patches that are roads
9 E i! w W# b/ c0 I* F: k]
. X2 v! {+ Z* g! @+ m0 C
( A4 ^: E( j$ O! B* fturtles-own& R6 |" B4 E5 h$ M. [
[* X0 U/ ]% ^, S% x& o9 [) g' _
speed ;; the speed of the turtle6 A! s1 S d0 Y- {
up-car? ;; true if the turtle moves downwards and false if it moves to the right) `- f A9 p' ~+ B, Q7 L0 n
wait-time ;; the amount of time since the last time a turtle has moved' l5 d m8 ]8 t4 v1 d/ D
], ?6 E9 ]$ T/ V+ }) O# I5 Z" U
& @7 s$ e6 L. N; z" }) P& w# j' |1 opatches-own
$ v; w1 J6 J7 b7 q' Y! V2 _[8 ?/ y+ z: g: V" N4 t2 F
intersection? ;; true if the patch is at the intersection of two roads- R; }5 |- L& c0 A% ^4 ]8 a
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
# k, ` ~: X9 N& N5 t: [$ P; b8 ^ ;; false for a non-intersection patches.' n4 Q9 u; t. P9 D4 d
my-row ;; the row of the intersection counting from the upper left corner of the/ @' o6 N$ W5 [$ v- o2 j
;; world. -1 for non-intersection patches.' l" d' o) D" C% @( K! I) a; @
my-column ;; the column of the intersection counting from the upper left corner of the
+ o* u$ N3 y$ z# q$ q, o/ e ;; world. -1 for non-intersection patches.
+ d+ }1 w/ v, X# k) c8 p y my-phase ;; the phase for the intersection. -1 for non-intersection patches.: \" v% O) O2 k& U
auto? ;; whether or not this intersection will switch automatically.
" Z/ `+ Z6 m- l6 y% j" s ;; false for non-intersection patches.
4 R2 a( M! [, r( B1 _]
/ |4 ^$ M, m0 y& z% E2 k# n q1 ~7 n8 f( a9 E; B7 K. V
* S( `1 |* {0 J, A" ~;;;;;;;;;;;;;;;;;;;;;;' o5 x, a. x q* W1 A4 F3 G
;; Setup Procedures ;;' p- M% {. W( I# d8 d
;;;;;;;;;;;;;;;;;;;;;;
. H3 D2 r) e1 k4 J- ~; v4 M2 o: D
' G! b7 n, W! m8 d;; Initialize the display by giving the global and patch variables initial values.
7 C9 i' w8 ]0 U* q! a' m; j;; Create num-cars of turtles if there are enough road patches for one turtle to
0 ?; ^4 H9 G# D% i1 Q* v- f;; be created per road patch. Set up the plots.
/ m% E" r% ?6 W% n7 K, ]to setup5 Q& T8 i P% N- ^+ u2 p) Z+ B
ca
6 V, t4 q8 G" G. m7 y/ z* H; `/ q. p3 N setup-globals
7 o+ a7 h! i# h! W
) v. J- W* y! _, L ;; First we ask the patches to draw themselves and set up a few variables2 E! R0 o+ p) i- {0 l8 ?1 h
setup-patches& t: M7 j. c; x" u# K2 ?$ K( Q4 [
make-current one-of intersections4 e6 Q, F& b1 y3 n- {/ a! n
label-current! [! L( v& X6 o" y# w
" r8 i5 T' p% q. ~) K
set-default-shape turtles "car"
% u. a: ~. }& b5 g0 e1 }/ D8 n4 |6 z( _2 N7 e) ]# a' }
if (num-cars > count roads)" F" ~2 v, }! H, ?) n* c7 q
[ n. ]" n& [4 g) I) ]8 F
user-message (word "There are too many cars for the amount of "- A5 @* _" L) y4 o
"road. Either increase the amount of roads "
9 N& N l$ Y4 X2 g; G "by increasing the GRID-SIZE-X or "! t5 e4 @/ [* f: K( O
"GRID-SIZE-Y sliders, or decrease the "
$ N; \! s* L& v$ Y "number of cars by lowering the NUMBER slider.\n"
- \; q" ` U3 v7 M: I. B "The setup has stopped.")6 P+ u/ w8 k w4 d) }, E
stop8 x* ]1 \& z0 T
]7 ]: [ G4 ?" _
6 \1 K- U6 w; C( Q ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
. |. h/ ^( B% I crt num-cars
: P$ n: P$ O* Z1 ~2 T3 O4 G- B. O [
$ E) Z. r; a. G, Y! E, Y d setup-cars
. g, B2 G: h; y6 r# M! w% b2 l set-car-color- l: D. |" g2 f4 D0 w# D1 X
record-data( K& S- u! E& x7 a, E* X
]
' G# @9 r$ G" D
, m+ I5 y9 i q* K8 d ;; give the turtles an initial speed/ |1 F, L* z" L5 A' T: w) x3 Y; n
ask turtles [ set-car-speed ]- L' ^; d7 C. E, S Y
) q! R. J% D! E reset-ticks
. v& O$ C+ s) }' Z3 z( yend5 q- |4 p0 }: c' |, @4 y2 d/ }
* E+ g1 H' r% J
;; Initialize the global variables to appropriate values! w' E4 Y% F0 ]
to setup-globals c( n1 H: c5 r& |2 y
set current-light nobody ;; just for now, since there are no lights yet, n3 x4 Y( Z; [/ B D# y1 L/ ~
set phase 0
/ ]5 y5 q8 z1 c! M3 k: ~ set num-cars-stopped 0
9 z& j* L( M/ G' i6 w4 b0 W" c8 }1 f set grid-x-inc world-width / grid-size-x
: [1 s5 M! w' L0 C9 r" J9 G set grid-y-inc world-height / grid-size-y+ n; N8 P6 S; Q+ ^2 E+ Y4 O3 K
2 t8 d) P3 ^3 T
;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary1 M N; q0 h- Z- j4 \
set acceleration 0.099
6 `9 a- E$ D: ~7 ~end" e, r$ f4 T" y3 B% h
- N5 _+ e+ s1 u) }4 f6 b
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,: J5 L+ K5 l3 @! B
;; and initialize the traffic lights to one setting
+ \3 |* q7 g& D3 Qto setup-patches9 I5 }6 Y: _7 f' U/ q3 H
;; initialize the patch-owned variables and color the patches to a base-color! z. m4 E! C$ Q9 W
ask patches$ X. x" l/ L# v) _
[
4 B- M/ M, m, k2 Z# P set intersection? false
]" p& j' m' M p! E; t! t set auto? false B: b5 E5 D3 G# D g0 @
set green-light-up? true+ Q; v. S3 z, o; @2 \ N
set my-row -16 n1 D8 j. i7 r
set my-column -1. u, x; p ~# f2 C) o7 A$ x( A& D4 L
set my-phase -1$ \4 T: ^. b Y$ p
set pcolor brown + 3
, E4 y+ m2 C+ A ]
" G4 a+ b' `- g" e9 @: c/ \# U7 ^+ J; a
;; initialize the global variables that hold patch agentsets M+ m! n* g9 |# Z6 d3 R4 q
set roads patches with5 n7 ~% l' B( x9 h2 s( t, t
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
. i4 H" _* R& \ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]% Z4 T; i: h/ u8 t4 K
set intersections roads with
$ `$ D9 _% S1 J. t/ H [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
/ s+ B2 @! ]# I V1 L# F _0 {7 \- o (floor((pycor + max-pycor) mod grid-y-inc) = 0)]6 V1 p$ o: m) F( R g" |' V2 s& U
5 A/ _$ f: a8 ]
ask roads [ set pcolor white ]# d: R/ v4 K3 n+ \
setup-intersections. }+ m+ w% x! f" G0 X/ y
end9 O7 `5 W4 ~+ K3 p/ b( I- F
其中定义道路的句子,如下所示,是什么意思啊?/ {/ |( @1 M& t( i1 W( k
set roads patches with
+ ]( N+ g3 D5 T! t1 a# q2 M [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or8 ]3 ~+ \2 K+ t
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
/ v8 n6 r2 a( P0 [7 b2 ^9 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? |
|