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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。
: B/ [ u5 I5 enetlogo自带的social science--traffic grid这一例子当中,7 N8 F4 C; B j, i- _: W% @
globals8 ^4 r) Y9 G1 z. {& G3 w' Z
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* K' v. A& n1 H- H: e9 h grid-x-inc ;; the amount of patches in between two roads in the x direction
$ V: t. ?0 m6 U* H7 o0 A, C y; Z grid-y-inc ;; the amount of patches in between two roads in the y direction
* A+ } h$ P! h1 E: P* b# L acceleration ;; the constant that controls how much a car speeds up or slows down by if
4 m; u" y' i! c _9 G ;; it is to accelerate or decelerate; `) H3 m' e' ~+ R
phase ;; keeps track of the phase. I# g# Y& w% j5 A
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
N o% m6 Z2 m |; N current-light ;; the currently selected light
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+ U9 h+ s; S0 F n6 U4 S7 ~ ;; patch agentsets
4 V/ o, C/ R+ V6 O, y4 K7 S intersections ;; agentset containing the patches that are intersections: x$ x% \+ b7 w
roads ;; agentset containing the patches that are roads- w* l* r% I4 r" [7 X+ ]
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turtles-own
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speed ;; the speed of the turtle7 j9 w, y( R( B4 m: C' D
up-car? ;; true if the turtle moves downwards and false if it moves to the right9 W q" T, H+ M0 X; f7 T
wait-time ;; the amount of time since the last time a turtle has moved3 t' h& p0 q; j1 h9 G* e3 U Z8 ]
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( Z7 D$ p5 N' L% L* S/ l2 K- kpatches-own
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intersection? ;; true if the patch is at the intersection of two roads: q& F/ E) ~/ M2 N& D
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
& Z3 L) J% ~4 T% R* Q# U8 ? ;; false for a non-intersection patches.
! [0 `% ?$ D& M+ V, [/ { my-row ;; the row of the intersection counting from the upper left corner of the/ z& Y) o& O/ ~; |+ e. M
;; world. -1 for non-intersection patches.
. I3 t: c9 _& r4 w7 }- K my-column ;; the column of the intersection counting from the upper left corner of the0 l: ]" Y/ g. B# j. j
;; world. -1 for non-intersection patches.
. V& b5 G1 O% J! o1 ^4 c% s my-phase ;; the phase for the intersection. -1 for non-intersection patches.
" |, S. N- D. O# G; Q- \ auto? ;; whether or not this intersection will switch automatically.
& i# E. p1 n6 o+ t$ o4 l) W ;; false for non-intersection patches.+ e1 ^; t: e/ N( ~( R1 k2 P- v' v
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;;;;;;;;;;;;;;;;;;;;;;
' ]1 t1 }' m, b4 e/ q, O; C* W. ?;; Setup Procedures ;;, |" Q3 ?$ Y. |7 c3 g( z
;;;;;;;;;;;;;;;;;;;;;;
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. g: p* x! @8 i* N;; Initialize the display by giving the global and patch variables initial values.
m/ |3 C* w, ^- c+ u;; Create num-cars of turtles if there are enough road patches for one turtle to4 D$ w- g {1 j6 }; r3 h) s
;; be created per road patch. Set up the plots.
: _5 J6 h$ ?; N0 Dto setup- f8 s3 Q1 @ g" s0 E5 k9 Z- T
ca
6 ]4 r+ X, ~% d) W7 P setup-globals# t# N* y7 B, c0 v( F7 M6 ] M2 v% d
7 C# `2 _( ?9 O( l9 c+ S ;; First we ask the patches to draw themselves and set up a few variables
$ i [4 j) z& ]5 O$ W setup-patches8 `! O" P f# A7 n/ p" E
make-current one-of intersections$ r8 a: y: L% d/ X0 }
label-current5 _7 p4 J# k0 I6 h
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set-default-shape turtles "car"1 y1 n/ e j1 p3 Y/ t' b
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if (num-cars > count roads); D( F2 Q8 B$ c; L4 k
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user-message (word "There are too many cars for the amount of ", X- r- E; S) a; G
"road. Either increase the amount of roads "( A9 e5 X2 m+ d' N
"by increasing the GRID-SIZE-X or "% u& {1 [% g, D
"GRID-SIZE-Y sliders, or decrease the "& p; ?8 l; u* {" h" ~
"number of cars by lowering the NUMBER slider.\n"
5 G" q6 N7 q. U" y "The setup has stopped."): y! Q* H. {' ]* J1 o, H$ {
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color! X& I; [2 F4 W' e: _7 \9 q4 W/ ]
crt num-cars
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setup-cars& G+ r. `+ m$ K- s1 V
set-car-color
& R4 Z4 f& ]# r4 O1 K4 s record-data
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;; give the turtles an initial speed( ^5 m- n4 H2 k' w$ f) o# E
ask turtles [ set-car-speed ]$ A' u4 f. z, y4 E3 O0 k1 v
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reset-ticks0 O& Q- H0 f6 l! j
end$ I) i: U. F, E0 Z: Y+ G3 u
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;; Initialize the global variables to appropriate values
_6 Y+ D/ c( W! Q, tto setup-globals
+ C6 d( d `2 f8 i/ }8 J set current-light nobody ;; just for now, since there are no lights yet6 S- U/ |3 Q) l m: @$ ?
set phase 0
- p2 u7 A8 l( J" L set num-cars-stopped 00 O8 E w! v2 T6 y5 F6 v6 y& Q: W
set grid-x-inc world-width / grid-size-x
5 O, N( L9 j* {( n. @ set grid-y-inc world-height / grid-size-y
0 z" V; T7 b0 G, D( S
7 G: S' ?1 G; v ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
: J o. u$ N+ {* U( y set acceleration 0.099
C- E# a7 E+ n( Wend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
1 r; x; X. o% s# y9 \! p! U, k0 g;; and initialize the traffic lights to one setting# ?+ k! Q0 x& ~& a# k& }
to setup-patches7 R3 u5 m3 v7 [+ {2 D
;; initialize the patch-owned variables and color the patches to a base-color
# _# R w% N5 x4 g; b ask patches
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0 J; C) y+ W+ `! l set intersection? false
! Y( X7 g& ?7 T) Z4 w2 x set auto? false% Z5 q6 d2 ?9 b8 }
set green-light-up? true
Z+ d0 i K$ c' o1 r set my-row -1; P0 Z/ _6 Q7 P/ v8 M
set my-column -1
0 M( J( Z% ~0 h4 N" W0 X set my-phase -1
( h) F; c2 D5 \' f! _- F$ ` set pcolor brown + 3) w, y X( X. b J5 t
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;; initialize the global variables that hold patch agentsets
8 s* K6 y# L6 g" l1 P7 P& ]* L set roads patches with8 h% c; ?) K) B7 ]
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or- }9 D- K" |! U4 a0 Y
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
" X2 b* p- i5 F7 Z set intersections roads with
" [! E* x g# B9 V4 n# T, f [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
* [, U& N6 ] m4 g (floor((pycor + max-pycor) mod grid-y-inc) = 0)]4 J# K) L. S9 s
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ask roads [ set pcolor white ]9 f/ ] N3 }3 o6 r S5 t7 O
setup-intersections5 ~5 ?( F1 v! I0 I2 C( x: d7 N8 h
end
1 m, N. e# x; K, Z9 b/ s$ T% h其中定义道路的句子,如下所示,是什么意思啊?4 s3 n1 J1 R/ c" m3 L+ A
set roads patches with4 R/ M$ W/ L, e8 e0 ^% X
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
7 F* A: n; o6 h& H3 w4 |) o- A2 b (floor((pycor + max-pycor) mod grid-y-inc) = 0)] O% A. M( A" X4 T; _
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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