|
|
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。
# T# k2 ]7 x3 t5 i C* v N- ?netlogo自带的social science--traffic grid这一例子当中,' }3 Q6 D' B; s4 U
globals* b& X, K, `5 d/ H: z! D, F% C3 D
[; |" w# F8 f+ P5 ?6 Z
grid-x-inc ;; the amount of patches in between two roads in the x direction
7 }/ [( m. p; ?2 E, A grid-y-inc ;; the amount of patches in between two roads in the y direction$ h# z" A4 r" z6 i s! U( [( E/ a
acceleration ;; the constant that controls how much a car speeds up or slows down by if1 O3 ^& y( Q6 I1 E7 d( L
;; it is to accelerate or decelerate) k8 p4 ^( e$ \" ]7 T& S' I5 N
phase ;; keeps track of the phase
! W' c% t* A# P* X: z num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
# g) Q. j1 s& [. v; U$ q9 F current-light ;; the currently selected light
. c( R9 }6 Q! n/ k
3 x( k$ F/ P! R, \3 e1 k ;; patch agentsets
v4 O6 r( z& h+ \' \# a intersections ;; agentset containing the patches that are intersections; N9 O8 u j9 p ^ ]: G
roads ;; agentset containing the patches that are roads
2 `: N6 f8 |3 Y$ y+ j]
4 w* x5 C v7 g6 m6 |6 v y Q
# P n" ]6 H( J( g; Dturtles-own
* C. E2 r9 @4 i- i% g* I" h! a8 [[
7 s# W" S' g6 b speed ;; the speed of the turtle
7 F z1 x$ M2 j( F0 ^: D& X up-car? ;; true if the turtle moves downwards and false if it moves to the right/ X$ l1 D, l8 h3 g- C* n. F
wait-time ;; the amount of time since the last time a turtle has moved
, g0 H, G; o& b1 z& y: t: p9 x4 H7 Q]. D" s" W* Q& j6 m) g. I0 x
7 {- ^ N' W- h0 h
patches-own* A% u4 a3 v) k) v7 R) L
[2 J, z4 G; W5 j8 d/ {
intersection? ;; true if the patch is at the intersection of two roads
8 X' m# o5 s# a1 b1 F9 A green-light-up? ;; true if the green light is above the intersection. otherwise, false.
) _$ E% C5 B& j ~/ x. _* x ~1 T ;; false for a non-intersection patches.
$ c4 _1 f' ]$ D, h$ G: \1 @ my-row ;; the row of the intersection counting from the upper left corner of the
; a3 a- ~: Y5 H ;; world. -1 for non-intersection patches.
5 X+ o6 O d1 b I- F my-column ;; the column of the intersection counting from the upper left corner of the. J1 v+ P( [) D+ J
;; world. -1 for non-intersection patches.1 V% p3 H3 L8 X: S" J6 E
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
% c8 I7 J+ ?% B5 _0 c9 {- B- W5 q auto? ;; whether or not this intersection will switch automatically., U/ P5 Y7 T4 J* m5 a, U
;; false for non-intersection patches.
) g" y H4 Z( C, @; U# U5 \]
1 y1 W) x3 L6 S
9 y$ \7 g) M& P5 H, d! P* J b8 m3 B& r' D* n- y5 c M
;;;;;;;;;;;;;;;;;;;;;;
' a0 V$ L3 E9 J; D6 z9 ?;; Setup Procedures ;;
+ g9 y: h2 ?7 R# X P;;;;;;;;;;;;;;;;;;;;;;- T( a5 v7 U9 m3 z9 G f
; p0 y& P3 K: E) _1 n+ R
;; Initialize the display by giving the global and patch variables initial values.
. n K& t1 E U;; Create num-cars of turtles if there are enough road patches for one turtle to; a: v% g8 P7 y! B
;; be created per road patch. Set up the plots.* K/ f+ X# T4 r: Z2 {* t9 B/ ~
to setup
8 {/ C8 D7 f7 ^6 p" a1 B! }% t ca' ^( j% `( o8 w V$ @. G+ j
setup-globals3 n5 o4 y6 o( `" Y
: G# k& B- n# D1 c/ F, x5 i
;; First we ask the patches to draw themselves and set up a few variables" K1 I, O8 |( ?$ b1 M
setup-patches
# v: H8 H7 W8 g9 _ make-current one-of intersections
' S; f# G( P5 h" u# B1 E label-current p1 M% t0 M, P# ?0 t
# e# ` K7 R& n2 u! [$ G/ t
set-default-shape turtles "car"
: ?9 V! |1 d, l3 }' ]# T+ T7 b! E+ c' r/ F, x+ T1 V, B! k
if (num-cars > count roads)
% i ?4 d/ X3 } [
& @: e+ n; J$ O' C) ], ] user-message (word "There are too many cars for the amount of "
7 g* c [. O9 O+ Y$ j "road. Either increase the amount of roads "+ f+ _! W$ q+ `2 N
"by increasing the GRID-SIZE-X or "& \. h: u) }' }4 W5 {2 |2 v4 [
"GRID-SIZE-Y sliders, or decrease the "
+ I5 a9 ]0 s% P, L "number of cars by lowering the NUMBER slider.\n"
& v% S" ]/ q9 m/ o& K0 x4 } "The setup has stopped.")
+ E7 d7 {% H3 }& e( ~/ M/ {; H stop( O. K: J* E0 _% D
]' q) P8 r. b/ [/ _$ z% K
2 c) w" k+ f( I$ d2 Y, R8 D E ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color7 O% M0 |% S1 t5 M
crt num-cars3 s8 M2 c! \6 S& G2 v" z
[
3 o( J+ S0 p6 F7 V: W7 E setup-cars& X5 i5 m. W7 i/ x4 u
set-car-color
# _. `' n- j9 r6 ? record-data2 c; A- \8 o! m, V) r
]
# B C8 Z; Y7 i0 B9 |8 g z7 K p$ D
. ]; g2 M2 I2 j6 H% a ;; give the turtles an initial speed0 m, Q9 A5 ~) o5 f1 h& I
ask turtles [ set-car-speed ]
4 S4 G, W7 m& L2 r8 @# C2 Z0 w
K; ~' ~2 B+ {, p! r- | reset-ticks! T9 s) y/ q" t& X( M: }
end3 m. Z( @8 p+ x% p
: U* p0 b7 O( \" N% r$ ~
;; Initialize the global variables to appropriate values
3 ?* N1 H. Y/ `5 [2 i) Dto setup-globals
( |! {, c- q1 L6 q set current-light nobody ;; just for now, since there are no lights yet. s# i8 J a" ~( H2 p7 c, t
set phase 07 o7 L- m+ d2 e
set num-cars-stopped 0' o# E' j% r2 O7 f9 r
set grid-x-inc world-width / grid-size-x
# ]/ o2 l+ K( o2 }+ L% r set grid-y-inc world-height / grid-size-y) a& ]7 `6 G4 i
" D, v" O& g8 g" B/ C
;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary: ], e; j- E) T
set acceleration 0.099
2 }) ~, S' N: |$ P, }# iend5 t6 c3 _7 n$ k* J9 M; ^( J
# k9 a3 M( Q0 i' U' R;; Make the patches have appropriate colors, set up the roads and intersections agentsets,' J) W5 k+ S8 d" t
;; and initialize the traffic lights to one setting
\4 u; Q& ]+ K+ fto setup-patches
, n9 y9 G# v* v+ C1 H6 o2 O ;; initialize the patch-owned variables and color the patches to a base-color
P& c: g: A7 V. C ask patches
3 i7 v* M- C5 E0 w2 ? [
$ c6 M0 F, `) A( { set intersection? false: X/ S$ p- C0 d% c9 T
set auto? false& Y3 l7 `- P4 Q) y. ~4 t" }
set green-light-up? true( ?; A. o, j, e5 V2 |/ J, u
set my-row -1
8 s# J( S- O" L set my-column -1
. D* s" _3 m9 |) v2 p( M3 Y set my-phase -1
/ J) Y1 U3 y* J8 l0 Y0 U set pcolor brown + 3# J h `/ @0 E/ j: p$ {5 U# Z
]+ V; N8 f1 d4 | i
+ x4 T6 Q- r) y8 k- o% b3 h. L ;; initialize the global variables that hold patch agentsets
# z# ?8 S6 T& v; {3 x5 G set roads patches with" ^6 \9 |, |0 {
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or) H7 C- Y5 f" W! r0 i; O
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]6 V) t( Y6 A @! K
set intersections roads with
) K$ z; i+ j4 ?$ P" d8 | [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and- |- q* n1 p5 G/ {2 C' u* F
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
; r! x; S- S$ H+ B1 n* I) Y7 i k$ J" H, v8 n9 X
ask roads [ set pcolor white ]2 p8 X3 G2 p: \" D6 m7 i
setup-intersections
# K6 @! g7 Q- q8 G! \) `4 Tend d* }5 q0 [! {0 m
其中定义道路的句子,如下所示,是什么意思啊?0 H# m8 Y6 A/ m: u
set roads patches with: F0 U# Y+ G% M& y+ u4 D# I
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or- F1 Z# I) P `* X" q4 f
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]; V1 V# _" M5 `- U+ N% V
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? |
|