|
|
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。
& n/ Q& o3 }! [2 r' s9 E1 snetlogo自带的social science--traffic grid这一例子当中,* h3 F$ Q( U x0 G, s
globals4 t; t; `5 B r4 g' ?5 u; s
[
+ l5 x2 z4 _6 [5 n! Y; O+ Z grid-x-inc ;; the amount of patches in between two roads in the x direction* {8 c& t a: y
grid-y-inc ;; the amount of patches in between two roads in the y direction- C0 Y% w: r5 B
acceleration ;; the constant that controls how much a car speeds up or slows down by if( p5 V- P6 V+ U& }; M
;; it is to accelerate or decelerate
# R$ A) V5 V7 [- s phase ;; keeps track of the phase Z3 b1 |% w/ S: |+ z7 @
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure' E G% a/ x, X0 W5 M! c) E' C
current-light ;; the currently selected light& K8 }# A0 ^$ X6 C8 R/ K
: q$ }) L8 r; Q9 j# S ;; patch agentsets
! A [; I9 U/ I- A4 D* a intersections ;; agentset containing the patches that are intersections
1 ?6 `# s4 j5 a0 h- K8 N roads ;; agentset containing the patches that are roads
2 p9 D: u# I8 }4 j]) g/ ^1 h6 a: h( ^
5 K+ \. _: v) y' m: _turtles-own
% H$ a9 X- X) r" |4 j# Y+ q[
; l6 _4 k' R) w6 j+ r# f4 z; O9 V speed ;; the speed of the turtle
2 ~/ B+ ?6 n- _6 ~) Z1 Y0 t: Q up-car? ;; true if the turtle moves downwards and false if it moves to the right8 h& ?& Y' j0 j0 P% S! k2 i0 ]
wait-time ;; the amount of time since the last time a turtle has moved
3 b8 o H% D2 h]1 ]4 u6 L! E) [& k
( ^/ Y, A- G! d( Y/ b
patches-own1 q; Q: v9 k8 O* f' y6 R7 Y
[
. g( F) U0 k' `, w" \5 M1 x' P intersection? ;; true if the patch is at the intersection of two roads
) E2 W6 g( [3 p- N/ f2 J green-light-up? ;; true if the green light is above the intersection. otherwise, false.
1 U* Y( `9 w4 H& c2 o; y+ Q ;; false for a non-intersection patches.! D8 c, B1 ]3 W) q( s* t
my-row ;; the row of the intersection counting from the upper left corner of the
3 {8 y4 B4 N% l8 \3 [ ;; world. -1 for non-intersection patches.( W9 n! c' R$ b5 L4 R2 W k
my-column ;; the column of the intersection counting from the upper left corner of the
/ K* |6 B3 o! d! Y5 C ;; world. -1 for non-intersection patches.: ]) K, }+ y! T' ~
my-phase ;; the phase for the intersection. -1 for non-intersection patches.; Q6 R. `. B7 C1 x) o
auto? ;; whether or not this intersection will switch automatically.$ }; k$ u5 y: X# n+ `
;; false for non-intersection patches.7 m, K* K& b; I
]
5 Y, ?6 k1 l: U! k @
2 }( s$ q' g( E5 c$ J2 }- |' ?
;;;;;;;;;;;;;;;;;;;;;;
! Q0 c! o2 |# s F8 p+ A" R;; Setup Procedures ;;# ]7 n3 } I2 g. d8 J* H
;;;;;;;;;;;;;;;;;;;;;;
4 T3 ^. g6 s2 J0 C
9 j' Z, `3 X6 X5 t, ^;; Initialize the display by giving the global and patch variables initial values.: P- e/ @& D7 b# q
;; Create num-cars of turtles if there are enough road patches for one turtle to
* ]3 e: w' e) Z5 _- m;; be created per road patch. Set up the plots.5 ]6 e+ X3 _8 T/ D Q/ X9 s
to setup
, w3 }* G! x. z9 f/ _7 @ ca$ P4 c' A" g) Y8 Q0 C
setup-globals
8 N: C. s& t; O+ P8 O% ^
2 P+ Z8 r8 B" P# F ;; First we ask the patches to draw themselves and set up a few variables; v0 R1 S, T$ \2 r
setup-patches
4 r: t) X2 j8 Y L8 c make-current one-of intersections
- y" z, w' T* \& J8 T label-current7 d r" j) K# k [' I! T C9 E5 T
6 H8 z4 Z& O! c1 D. A |9 q set-default-shape turtles "car"
3 Q' [$ q( ?, _0 p. }* F
3 d6 e5 { f; W) J9 t2 m- a if (num-cars > count roads); q, C8 \3 ]/ I" W+ G7 e: |4 Y
[0 k, e! `" b: T0 @! a/ J* Y
user-message (word "There are too many cars for the amount of "; n" N9 w2 a$ n* [7 V
"road. Either increase the amount of roads "
* e0 _+ O& A3 z5 r "by increasing the GRID-SIZE-X or "
- c" W5 H8 p, m& D5 p9 j "GRID-SIZE-Y sliders, or decrease the "" W5 ?. u& P1 D2 X; i
"number of cars by lowering the NUMBER slider.\n"* w! |6 a h; F- L
"The setup has stopped.")
8 F4 Y% Y# ^9 |9 z8 K/ D, t stop, v+ h7 Q' W- Y4 R" p$ t# u+ l4 c
]. F- O+ [4 r b3 ^8 d B
$ H; v& ]# ]1 G" D" x
;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color3 [% [8 j d$ A' M& Q
crt num-cars
. l3 e8 a( Y2 K) K; M8 E* m [4 x7 Y$ }& I7 a1 U3 E% H7 b
setup-cars
$ K, s% ]3 S1 w B3 L# y set-car-color% `* Y, M/ c$ b" h% x
record-data+ n9 Z) D: F. }* X, a
]
9 m: `) t& X/ w0 |" u- L, p; m/ v+ O. N- v. v' @
;; give the turtles an initial speed, @ X5 V2 L$ ?. O$ z
ask turtles [ set-car-speed ]
- J* D4 H. }) g
6 b& s* p. j$ S, C, j' m( p9 S7 f reset-ticks9 E4 N! U2 W0 C* v) X; P
end/ n( ]/ H: b' R( Q/ }' r+ I$ B
- o( M" |' \ Q, Q, w;; Initialize the global variables to appropriate values
: A# }* T0 k+ f( S8 vto setup-globals
! `/ h5 b i9 S+ p \+ l set current-light nobody ;; just for now, since there are no lights yet
6 m1 l2 M5 N( x set phase 0
; T* N1 t2 w2 Z. `5 m/ Z! v set num-cars-stopped 0
$ ~% b2 A) s3 T9 m8 z% n set grid-x-inc world-width / grid-size-x2 T; `- N/ Q9 b
set grid-y-inc world-height / grid-size-y
; U9 u; l: H# ~/ e7 {( y0 }, i8 G/ R4 F- d. h% }6 w6 s
;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary) t- {! t5 u8 c |- n0 O! v& o
set acceleration 0.099
5 \! B0 g. I# H3 n" @end
& K! M0 l$ ]3 U
& i3 h* l6 s% W- M b! h' I;; Make the patches have appropriate colors, set up the roads and intersections agentsets,) u8 S3 ?) o/ n" `8 Z: U
;; and initialize the traffic lights to one setting
& V+ P$ A0 K& y( Vto setup-patches
( c- o' x& v% O2 @% c ;; initialize the patch-owned variables and color the patches to a base-color
' m4 q; K6 g6 ]; m$ } ask patches
6 O9 @; A" F. N* d \0 d- [* T [
& W* U9 [! h" a# {$ g1 D set intersection? false/ d4 j3 y/ z9 n6 ~9 k7 U
set auto? false
$ Z& U7 M& W& C# i* M0 ]$ |8 r set green-light-up? true2 L4 p: O, a/ [) v& Q: k. N
set my-row -1
% I- k; W1 q) p5 V: K: y+ h' p set my-column -18 u& @" r# S' ]* @6 g
set my-phase -1
1 F B' ~ j. A2 m# l8 ^* m$ I set pcolor brown + 31 V" i: j( W/ H: H; Z
]
1 M2 z0 k2 d2 _, p3 o# x8 }
1 v( w" ^% a( R* @* e ;; initialize the global variables that hold patch agentsets
2 T' S6 _3 l) ~ set roads patches with+ O3 x9 V! r- F7 @
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
+ k# s/ l5 s" r$ d5 R8 e (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
7 L4 R5 k7 V/ A! R& E' w5 e set intersections roads with
, v. J: G7 W5 B1 p" I- { [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
8 w1 V! G* P( o2 S8 k- b (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
5 x. ?# s! F% g. |8 @2 I+ C; ]3 A/ E5 }9 e9 e
ask roads [ set pcolor white ]
: E5 S/ q5 [% q. I$ o9 { setup-intersections
% ^+ j2 @4 P' ]end3 C! J# c% e# l( j/ p
其中定义道路的句子,如下所示,是什么意思啊?
! O9 |5 R9 b* h6 s4 P: ^% l set roads patches with
0 J3 U( U5 `7 C$ U. r( a [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
4 U# k6 Q& b6 M0 ] (floor((pycor + max-pycor) mod grid-y-inc) = 0)]) C$ U/ K- W( \! Y# U2 r" P5 W: Y
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? |
|