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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。
0 M- U0 p( {" B8 `netlogo自带的social science--traffic grid这一例子当中,
& u" P& w7 I: U6 X- V! Jglobals
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% K# m& r$ [/ G! z grid-x-inc ;; the amount of patches in between two roads in the x direction
. A) A, }4 F! |9 X! M5 z; P& C2 d grid-y-inc ;; the amount of patches in between two roads in the y direction) `6 _' v P2 B7 ?
acceleration ;; the constant that controls how much a car speeds up or slows down by if1 S& E: Y6 @# E0 X
;; it is to accelerate or decelerate9 H) f8 s9 e- s. L
phase ;; keeps track of the phase% ^# N+ A5 E, G1 `, c7 P
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure8 K0 ^) R# h& Q6 l! j. @
current-light ;; the currently selected light$ @8 W4 g( `; e; O) ` x. n) i
$ L6 _* R% C, ~0 P# a7 m ;; patch agentsets
, `1 A) Q5 H1 V4 I E intersections ;; agentset containing the patches that are intersections
; x) w' F5 o H0 B roads ;; agentset containing the patches that are roads
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turtles-own5 M( v, |/ K3 t
[
: R; X, u9 Z4 c- J: n4 m speed ;; the speed of the turtle6 X! _, h1 E. g; p1 g
up-car? ;; true if the turtle moves downwards and false if it moves to the right
0 B) I6 V r. t+ O$ j, m, T. Z wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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intersection? ;; true if the patch is at the intersection of two roads# m" v8 N" F) X U Q% b
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
8 G' c+ x; G6 ` j3 P5 L( u& i ;; false for a non-intersection patches.0 U+ [; ? j, A% m4 l4 L+ E! N
my-row ;; the row of the intersection counting from the upper left corner of the5 q3 H& a' C4 n% E( Y
;; world. -1 for non-intersection patches.) k- A( z' }$ ~
my-column ;; the column of the intersection counting from the upper left corner of the1 U3 f9 S0 F- w% p" v4 J. C
;; world. -1 for non-intersection patches.( H7 g" c+ o9 [/ i6 U( R2 @/ Z ^
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
: `, w; O, Z3 P. d auto? ;; whether or not this intersection will switch automatically.5 }! _8 L& k. T" f% l: f: N
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;* V9 t3 P9 F8 W- q0 P3 A" m8 m
;; Setup Procedures ;;7 K; m) [7 Z& l! Z
;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.1 g u8 g9 R) J6 O
;; Create num-cars of turtles if there are enough road patches for one turtle to3 Q2 v' M1 O( L0 ?$ k
;; be created per road patch. Set up the plots.
B6 r" d! k, B4 R2 B/ T. Rto setup% R( j) h* K4 E
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables; E9 C8 `4 Z; W8 r0 H
setup-patches
9 i! G/ e9 P7 T# [9 P+ e make-current one-of intersections
6 C( e$ ?% _# ^' \+ j label-current
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set-default-shape turtles "car"
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if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
$ z. ^6 L: R) m# k: n5 \ "road. Either increase the amount of roads "
6 Z9 f/ h y" H6 [2 n0 c "by increasing the GRID-SIZE-X or "
. y3 Z3 h& w8 ~* \( n" B! c "GRID-SIZE-Y sliders, or decrease the "
" ?! h# v2 G7 ^% M# i "number of cars by lowering the NUMBER slider.\n"1 J! M$ c. o1 B4 F2 Y
"The setup has stopped.")
2 o8 ^7 V; ^. [7 C3 }- P2 [ stop
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( K: i; y* A a ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color! o+ `6 x5 P/ ?( \, V) E" T
crt num-cars
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7 o# V/ x" ~0 Z3 R2 U& `. Z# h setup-cars
; j# |7 ]" {& k# ~. s2 n5 a set-car-color# X; p7 A, U+ a
record-data9 w- K6 E- \# s
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;; give the turtles an initial speed0 d( i/ y6 o$ A1 u) W; C
ask turtles [ set-car-speed ]" D+ ]4 D5 d6 {. ~. ?7 ]1 o
" B3 v) U5 L. y reset-ticks. N0 Q! u! ~" u" w
end
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;; Initialize the global variables to appropriate values
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set current-light nobody ;; just for now, since there are no lights yet
7 m& N9 b+ h4 O# | i set phase 03 V7 O* C. `* a( _+ `
set num-cars-stopped 0
2 H# p( J3 S9 Y; @+ r! x set grid-x-inc world-width / grid-size-x) n0 A: I a$ Y) ^8 U1 b6 [9 x
set grid-y-inc world-height / grid-size-y
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g. E) L. T8 x ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
4 P: q8 m! N8 \, n- P6 q set acceleration 0.099
; T' z& X5 J. ^6 ^6 B6 Rend- `+ i. e* s! Q. z2 r
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
( L- K1 h9 C7 t% t;; and initialize the traffic lights to one setting7 l) e# j# _# O* A( k. _
to setup-patches3 t4 ^& Z D4 ~% w6 c0 P
;; initialize the patch-owned variables and color the patches to a base-color0 L# v& H( }5 [ _
ask patches
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set intersection? false
+ q3 q& e" q6 x+ i z set auto? false' q* t' F3 T5 U7 ^6 W4 j
set green-light-up? true5 M& _) [1 c0 T6 u+ T3 q p% Y- Z
set my-row -1* ^9 S2 A1 W# f: \ T$ _
set my-column -1
; {/ r2 P/ q0 v0 a3 N set my-phase -1
7 I$ g3 n* X% X1 \9 ~ set pcolor brown + 3
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6 q; C; @ Z" r$ l3 i$ ~. x' ^ ;; initialize the global variables that hold patch agentsets
1 Y, i' W3 f) N/ k6 N set roads patches with# A$ s: Y6 l' t9 w( K: O% e' f
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
$ R/ \9 p& D4 R2 w0 f* l: g$ j (floor((pycor + max-pycor) mod grid-y-inc) = 0)] E0 Z p" ]2 v5 O+ _
set intersections roads with
% G1 h' U Q/ p4 `' b# B$ A" r [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
* f! c+ p4 q/ b: k (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
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其中定义道路的句子,如下所示,是什么意思啊?; V0 {& e# n6 b) m, t
set roads patches with/ @# C# V- n" d+ R" h' k
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
+ J- y9 G( b: C# M) @ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
+ O- |" A9 y3 h7 \% M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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