|
|
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。
* m) E. i" x8 d# p1 r0 [netlogo自带的social science--traffic grid这一例子当中,
8 Q* T5 D2 j( x/ {: J) Q, Gglobals9 N4 u0 t' O! A* z0 J
[
% W+ j7 ]+ J( }* r6 }/ Y grid-x-inc ;; the amount of patches in between two roads in the x direction
# f, c0 [5 u+ {1 F' g: x# y" ^" ?6 S, I/ \ grid-y-inc ;; the amount of patches in between two roads in the y direction6 B3 w P7 D9 _, Z* P
acceleration ;; the constant that controls how much a car speeds up or slows down by if
7 T8 r3 n1 F- T$ D/ N8 F( f ;; it is to accelerate or decelerate
+ F8 V1 T' h2 S( {7 E phase ;; keeps track of the phase7 }9 k: s+ u$ L$ }- h+ A+ `) W
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure9 s* E; }! O) u5 I
current-light ;; the currently selected light7 O R' r* J* w5 e2 e% B4 y
2 n2 @/ i! C! h3 W( D8 { ;; patch agentsets1 p$ P& b, }/ {- [
intersections ;; agentset containing the patches that are intersections& ^/ W( i* |. O9 C+ [/ R7 U
roads ;; agentset containing the patches that are roads
3 U8 d7 B4 H; X0 k, G]1 W7 d6 K( Y% ?' b
& u7 h3 k( L- Y i9 F
turtles-own
! U& i: D9 t; k[( x3 u( t! @- O. M
speed ;; the speed of the turtle
$ _( A" l6 ]+ M" u3 G" p up-car? ;; true if the turtle moves downwards and false if it moves to the right
/ D3 X" E* g4 d [# z# G) p wait-time ;; the amount of time since the last time a turtle has moved# w l n& l! y
]) i6 ~) y/ S* i& w
/ K4 t& a. G3 s' F$ _3 |8 l4 {
patches-own S9 e8 ^+ U# d. g* l- ~* ?
[+ \. a! I& j, ]2 s# D) A ]
intersection? ;; true if the patch is at the intersection of two roads
* t4 F' k2 J3 p- i green-light-up? ;; true if the green light is above the intersection. otherwise, false.
- D+ J5 `% d. i' t: a ;; false for a non-intersection patches.
2 W& j/ X+ q, N1 A my-row ;; the row of the intersection counting from the upper left corner of the
* M! T) \4 ^$ {* {! R9 I4 p ;; world. -1 for non-intersection patches.
$ f6 p. _: J# v) {; y my-column ;; the column of the intersection counting from the upper left corner of the( @( z, N6 [ t% m% l
;; world. -1 for non-intersection patches.
, h) e4 i6 D, P7 t, e my-phase ;; the phase for the intersection. -1 for non-intersection patches.- i" T9 j" u+ r1 u9 T; ?4 y
auto? ;; whether or not this intersection will switch automatically.
) ~7 J6 F" u2 T- T% e7 c# F ;; false for non-intersection patches.
* c$ \) `8 N( l+ [7 v" A* R& |. o! v$ X]
) F! R# |/ \. S& _2 @
4 B! Q1 P+ ]0 s( n z# p+ M; G. a4 Y) p
;;;;;;;;;;;;;;;;;;;;;;- }# g% ^- s: B) R# f8 n
;; Setup Procedures ;;
' E' F1 c9 }% G;;;;;;;;;;;;;;;;;;;;;;
( ^" x* ^4 D1 V Q p; V C, i. x3 d% o
- F* n* h4 k1 @;; Initialize the display by giving the global and patch variables initial values.
, d- R. H( p3 x+ I5 {7 W;; Create num-cars of turtles if there are enough road patches for one turtle to
7 ~! F) W' v5 G/ o0 \0 D5 g;; be created per road patch. Set up the plots.1 l) R1 n/ X/ L `7 ?. W" B
to setup
& ]( _ ]: |* w/ Y9 @* V ca
5 X j) G f4 a" ` T0 j, ]6 m setup-globals! T* b/ j% i* Y W
& r7 x7 x0 l; P
;; First we ask the patches to draw themselves and set up a few variables
& M4 K1 ~8 w, i setup-patches1 u8 n: N0 [" W: x. F7 s2 c$ x
make-current one-of intersections
" I$ z0 H6 N% Q2 ?$ F" L! X label-current) ?; F; @% b# {$ I4 Q* |
9 M4 y1 V: }* L, N+ s
set-default-shape turtles "car"
( a! Z! M7 j% _. S! Y* Y8 z. i' }4 n& ~8 z
if (num-cars > count roads)$ ^, g& t, @ q
[
7 H5 z; t- D7 l8 w$ H# O user-message (word "There are too many cars for the amount of "
) c) T$ |) a ~' O$ w2 q "road. Either increase the amount of roads "
% A7 x, L; ]) D8 X9 I {% b/ | "by increasing the GRID-SIZE-X or "9 Q( J U" `& J" O. ?1 Z+ t
"GRID-SIZE-Y sliders, or decrease the "
0 K L6 d. M- z2 H9 F5 a1 l6 C; v "number of cars by lowering the NUMBER slider.\n"; o# ~0 H: O4 M
"The setup has stopped.")
4 T- g p7 u+ `0 @5 H) q! H stop$ N% C* l. ]4 q$ S) m, g
]
9 R) u* g; f( r
7 H: {* E% O8 Q4 f ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color8 s) m6 v) D; h
crt num-cars6 l( s, r, ?' n4 Y* T4 d
[
3 ^9 ?8 n4 O2 P& w setup-cars
( \) J& K: W* ]4 O7 R ` set-car-color$ j0 a/ E5 ~; Q, Q1 F. } Z1 W
record-data
2 Y+ k& h, o& n ]! n1 g- i/ i5 O; G- x7 R4 B4 n
: }) F* ~6 P# d) X6 M ;; give the turtles an initial speed
5 |: }7 J; X% ^; x" J ask turtles [ set-car-speed ]1 i! N: S1 V3 z* D u! Y. ]
3 {( _+ X! I; g reset-ticks
, k5 J& X. E3 O) K% @0 C8 ?0 uend
' D& d5 v% G; G' J
* R) u% c. e, `;; Initialize the global variables to appropriate values
0 |- i/ ]! [5 `+ }/ k- b& Y! l6 `to setup-globals7 c. A6 F8 _/ V# F* @5 v
set current-light nobody ;; just for now, since there are no lights yet. Y+ j5 K$ H: I6 v4 ~9 n6 W
set phase 06 Z2 g$ b% {8 T, _- f+ ~7 {- ?
set num-cars-stopped 0% U3 i$ v2 B. r1 L7 o Z W
set grid-x-inc world-width / grid-size-x0 A' J2 [5 ~' o" r8 F
set grid-y-inc world-height / grid-size-y- T/ r! d$ e3 i$ [! u
6 e) E& L$ s2 t% x1 k ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
7 A9 V: ~9 u& W3 M5 } set acceleration 0.099" G" @1 g( W+ Q2 D T2 m3 ?
end
' B4 \. U4 H2 m) s; p/ z i% S0 p
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
' C1 G3 w9 f- V) z! h6 ^;; and initialize the traffic lights to one setting
% s& I. t# u/ J9 g2 R8 v9 ato setup-patches
8 V( X' \0 E$ L g/ L ;; initialize the patch-owned variables and color the patches to a base-color
3 y0 Z4 m4 n/ ^2 s" T2 ? ask patches
; y$ T# [8 W; V" ]- i! m [' A: e/ z( Y7 Y* C( T
set intersection? false& K2 N3 w. s8 C9 L
set auto? false! H# i1 ~. b4 C; g5 v
set green-light-up? true7 a! @4 J0 `0 t
set my-row -1
& @; T' |; @ n4 a5 Z set my-column -1
/ D; g% B8 o) ?* e } |. Z set my-phase -16 ]% a8 n! g" {
set pcolor brown + 3
4 t4 }' |, I* c) \ q ]
. d d3 j Q/ l- `! b/ p# [+ Z6 Z: E' r& Q$ j( S. J" T3 v
;; initialize the global variables that hold patch agentsets7 M, }; ^, I3 X: n- _
set roads patches with
( C, l, Z* l: i! G+ }& u [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
: U7 e& g M4 d( s* U* N& C (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
/ y& g+ ~6 K7 e2 p3 N set intersections roads with. Q4 s8 t% K! L, z- Y
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and1 U) c$ ~( v0 P; a
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]$ W" l% H+ y# n B7 I0 }! h
& u& H8 y/ \" w$ \/ _1 B0 b ask roads [ set pcolor white ]
* {& ^' H( J1 d. R$ g a setup-intersections9 T, h1 P- _: o- ?6 x ]
end
6 V. m9 a G( ?% ^: x; T: p' Z1 B其中定义道路的句子,如下所示,是什么意思啊?6 p0 R& X2 R3 |! e' _2 I+ {" N# ^
set roads patches with
! \9 J& q! m6 _6 p [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
1 @7 P r0 s2 S; I8 k8 } (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
$ _/ o( r6 a+ \ B7 R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? |
|