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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。9 e, e& ]6 v' B4 j' o3 N
netlogo自带的social science--traffic grid这一例子当中,. I5 k* h8 @: ]/ z6 z; L" P7 C
globals! S$ O/ Y" B \7 a/ S
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grid-x-inc ;; the amount of patches in between two roads in the x direction
& J) F% `9 M% {+ E9 { grid-y-inc ;; the amount of patches in between two roads in the y direction% B" m6 P9 k4 n3 d8 u B3 b0 {* p1 q
acceleration ;; the constant that controls how much a car speeds up or slows down by if7 O9 a& p5 a* J, Q* s+ m
;; it is to accelerate or decelerate
. r% |' q9 P. d! D phase ;; keeps track of the phase" Z9 O, f" O! r
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
) T5 a8 N/ A' x, V# g current-light ;; the currently selected light4 `% E8 G8 i) N2 M
9 h0 v" ?; P* J9 N+ o ;; patch agentsets
+ E( Y( j! z2 z& z! \" M: Z: N0 ^ intersections ;; agentset containing the patches that are intersections
& @! Q( H$ F4 ?1 m" _( ~" c4 Q roads ;; agentset containing the patches that are roads( W+ Q+ r/ R! ~8 g+ Z5 U' W
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turtles-own) `( h4 f1 \) x8 n) o
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speed ;; the speed of the turtle2 I6 i, R h% k$ P* Z
up-car? ;; true if the turtle moves downwards and false if it moves to the right
/ o0 x" w1 t: t8 ?$ q/ B/ D: ] wait-time ;; the amount of time since the last time a turtle has moved% L/ u2 g! h% N4 c
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patches-own" G& f6 G/ V/ ?) w1 A
[
* _7 |4 s0 I7 s" Y F( K0 V* B intersection? ;; true if the patch is at the intersection of two roads& W, R+ d( ]& ]) M& ]
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
0 ~) ~0 }7 Q* e# r$ L" t ;; false for a non-intersection patches.4 f) f& C! o( b7 X# S% t
my-row ;; the row of the intersection counting from the upper left corner of the
: K. R8 n& `% k T( W ;; world. -1 for non-intersection patches.
% ] U; b# H+ K my-column ;; the column of the intersection counting from the upper left corner of the
8 W1 @$ ]" S" t% L" p( G$ a e ;; world. -1 for non-intersection patches.
- h- D$ f* x: [( G& b3 J/ M my-phase ;; the phase for the intersection. -1 for non-intersection patches.
: O1 t+ m; S; B5 s auto? ;; whether or not this intersection will switch automatically.
+ y1 J# q, ?8 e0 o ;; false for non-intersection patches.1 \8 g+ b& ^2 u3 e( _: @
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1 N* h" a+ R/ }, L. A3 k7 }8 a;;;;;;;;;;;;;;;;;;;;;;; o7 O9 H3 X7 F) {. v
;; Setup Procedures ;;6 T8 c4 Y; ^0 N# d* V( O" L, O( D
;;;;;;;;;;;;;;;;;;;;;;
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0 c7 h0 g( g2 R, J;; Initialize the display by giving the global and patch variables initial values.% c% Y( |6 ?; y8 {+ m* n( n- M) F
;; Create num-cars of turtles if there are enough road patches for one turtle to
0 i5 m. _ A% A$ v, E;; be created per road patch. Set up the plots.- q4 j. X, `2 ]0 z
to setup
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setup-globals9 j4 n$ B+ ~0 Z4 i, l- t' z
; k/ r1 y- d, y8 s ;; First we ask the patches to draw themselves and set up a few variables, h" F* z ^7 H( T1 J
setup-patches
3 [* D) z. v5 n7 b' h make-current one-of intersections4 g, {' h/ j# B' P
label-current
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' z) g0 T4 z0 _, g: r set-default-shape turtles "car"
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if (num-cars > count roads)
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, X |* b2 L8 P$ D# e5 d0 m6 O user-message (word "There are too many cars for the amount of "
+ Z. A9 q* b" a: u7 l h: P& u" n "road. Either increase the amount of roads "
1 T0 a$ X( B# T. w8 U7 ]; p! c "by increasing the GRID-SIZE-X or "
* i" {4 B' F3 ~' l, ?* M# I- m "GRID-SIZE-Y sliders, or decrease the "
& I5 P- U0 q* O5 ^7 F1 R* W, |: O "number of cars by lowering the NUMBER slider.\n"
9 U n7 K) a* P6 p "The setup has stopped.")4 k) }( |% v7 C+ ?; J% ^* M' Y
stop0 V( _- k8 x& v* a# K
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* q7 }6 r, x! Q4 m ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color9 D" z( x4 Q0 e( b5 Y/ s
crt num-cars1 F2 c3 s! {7 @& Z
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setup-cars4 |6 V# a7 {! D( e" z' v2 T
set-car-color# X+ m7 C- e2 s9 k+ m9 ~
record-data7 X& e1 i4 m! D& f* J1 S# l
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;; give the turtles an initial speed
: i$ b& h( T. ] ask turtles [ set-car-speed ]0 v5 q R3 d( Y
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reset-ticks/ ^ \% D0 L2 L% A
end
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! _5 e- }1 G+ ]% m9 H" W8 Q;; Initialize the global variables to appropriate values& b3 O" q( Z2 o# r: d6 g, r
to setup-globals
7 S; `5 p% G; D. v+ S. X: e set current-light nobody ;; just for now, since there are no lights yet
! A1 c' y0 \5 r! ^& j set phase 0
) q1 y( M9 D# q! u9 A set num-cars-stopped 07 ~3 y; E/ e5 l) k
set grid-x-inc world-width / grid-size-x. k( F# F3 D, o- B; ^) _
set grid-y-inc world-height / grid-size-y
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
" H; H+ m; ?1 O4 B0 Z7 q set acceleration 0.099& R# x; w8 Q R: v; j
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,- C& q6 ]& F, I1 ]0 C4 D4 {& Q
;; and initialize the traffic lights to one setting/ }: t6 S' G1 q/ R9 R; s
to setup-patches
% _8 [* z. H/ z2 n ;; initialize the patch-owned variables and color the patches to a base-color, K, }' T# Q- s2 j+ ]
ask patches) D4 O1 j5 l# I+ ~! N- z
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set intersection? false0 G, O0 R$ V# Q \/ Z' q# i
set auto? false
. w: A% ~' t# ^ set green-light-up? true# v- X' c. b3 g( e9 a
set my-row -1! |( m" a1 {% i. \* f7 o
set my-column -1) _! p) n. s1 l& b
set my-phase -1
' G6 J; y) v0 M set pcolor brown + 3' Z5 U: u1 o4 T8 ?0 c7 s2 X
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2 x: T+ @/ B* k/ e- q* B ;; initialize the global variables that hold patch agentsets
+ _- O4 b9 ]7 w8 r set roads patches with
! i( ]; k. z/ m1 h0 F8 u7 s [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or8 M% |3 V5 E1 B! a& v A
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]; t0 N2 X4 `2 r
set intersections roads with
2 M! `+ \) ]6 C [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
/ d( f" m, b6 [ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]1 q' ~1 N+ B0 B
setup-intersections
7 H% ~5 K8 C; |end
& w( O' Q6 o: b8 r2 ?& Z9 P9 x2 v; {其中定义道路的句子,如下所示,是什么意思啊?
5 ~# E8 J# p- l set roads patches with$ W/ J' e3 X! u2 ~3 d$ d) y" x
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or \4 p. d- f' X4 G/ t
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]: x, w8 \9 J K) @# Q- A* T( 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? |
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