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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" ?! T' y9 q# [
netlogo自带的social science--traffic grid这一例子当中,6 w: k$ b' r+ L3 Z! I: S" w' z; S
globals* P( n3 { y# X5 }, }
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grid-x-inc ;; the amount of patches in between two roads in the x direction
& k+ @6 ~/ Z( O( P* Y Y) T grid-y-inc ;; the amount of patches in between two roads in the y direction
$ L1 t! G3 [/ M1 ?5 B3 P6 k! c acceleration ;; the constant that controls how much a car speeds up or slows down by if) ~6 ?' B) Q, k
;; it is to accelerate or decelerate
* F" q! b1 K4 ^! p9 k% n6 g; W phase ;; keeps track of the phase
! q+ M1 e6 _ e# W/ R7 c# S9 ^* t num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure3 x& a4 I' ]7 G* e" A& w
current-light ;; the currently selected light
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;; patch agentsets
3 k ?: T' o, e( {7 `. y intersections ;; agentset containing the patches that are intersections C" i2 S1 x( g% b- w4 J
roads ;; agentset containing the patches that are roads/ N8 v3 P8 q c1 o( O
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% d( ~( f) p0 `- K5 Tturtles-own: M4 u7 s" d& [7 ^& |; O/ e4 x" o+ K
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speed ;; the speed of the turtle
6 b9 ~8 E* e' q. B/ l% C! m up-car? ;; true if the turtle moves downwards and false if it moves to the right+ z# a2 Q, C) v6 E: B
wait-time ;; the amount of time since the last time a turtle has moved
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3 e) Z2 u2 W: U! p" R2 ppatches-own
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: y) m8 |4 \8 Q* k+ |5 h$ Q: B intersection? ;; true if the patch is at the intersection of two roads; Y4 N( n: o. W6 d, W: e
green-light-up? ;; true if the green light is above the intersection. otherwise, false.* I1 R" V; x/ [/ w2 a( r( g$ w
;; false for a non-intersection patches.* \4 H* I, f& @8 o" R% n
my-row ;; the row of the intersection counting from the upper left corner of the
' g' |* e8 a) X9 O, C) }9 ]1 l1 @' S ;; world. -1 for non-intersection patches.3 p" E: a; y; W' k9 f1 y
my-column ;; the column of the intersection counting from the upper left corner of the
/ ~" D" g& ^8 F6 c; q# \ ;; world. -1 for non-intersection patches.
' O8 v! ]4 R) G my-phase ;; the phase for the intersection. -1 for non-intersection patches.6 _$ [) ]7 D# @$ C: C6 ]
auto? ;; whether or not this intersection will switch automatically.: }8 \9 E3 r1 M* P; c9 Y, T- P
;; false for non-intersection patches.
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# T# ?8 g/ R6 p' l
1 u+ Y0 B9 m! O$ h;;;;;;;;;;;;;;;;;;;;;;9 u% V. g0 S/ z. Z V. o
;; Setup Procedures ;;
4 U$ y+ @# c- ?# r- M5 M- W3 U1 V;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.
( }: ~4 h- w7 }5 O& |, f;; Create num-cars of turtles if there are enough road patches for one turtle to
; B! v1 m) p' R: m& \: w: O6 b;; be created per road patch. Set up the plots.6 z5 Q: i- `) u4 M0 t! |
to setup5 H; V& @+ a0 n, P2 X$ M7 l$ d
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setup-globals
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! G. K" ]8 @% ] ;; First we ask the patches to draw themselves and set up a few variables
8 M0 t3 i; x( P7 V* V$ r6 }* j setup-patches2 _3 S! z+ t* d3 H3 R
make-current one-of intersections
1 s8 u! p/ X) \4 C; n label-current
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set-default-shape turtles "car"' j8 S, X% f* `
; r L1 K0 |" _3 L3 g if (num-cars > count roads)
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$ L( w6 g; x& ?/ B user-message (word "There are too many cars for the amount of ". w+ P( F8 z# M( g& k
"road. Either increase the amount of roads "
1 r3 K& h! t9 W5 w8 I. U& K "by increasing the GRID-SIZE-X or "
# _& x" }% Q1 l, \- A+ Q/ Q "GRID-SIZE-Y sliders, or decrease the "- P: Q; }$ U) I2 C& \
"number of cars by lowering the NUMBER slider.\n"
1 S7 ?- }+ P/ F) U. H O* t$ U/ n" g5 [- S "The setup has stopped.")
' V( V! L A: [# y/ S0 V stop1 A& Y# ?, _. |1 {
]
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( F, e8 o" L: c0 B% m ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color8 {, ]& y4 P7 r+ b" j% c ]
crt num-cars
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/ c7 y# R8 O8 M8 N setup-cars
+ M' e) s) _$ M. H7 i E6 ~ set-car-color
$ L! f9 o1 S2 L record-data* W( M0 | ]* G# y* o
]
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1 F( W0 i( y0 ~! p a; m! } ;; give the turtles an initial speed
2 }1 j8 i- H3 k M; i, f; Q ask turtles [ set-car-speed ]4 \% t/ c5 _0 w C1 O7 b7 U# m
v3 I/ ^6 x% L4 {% D* ~ reset-ticks$ l& C7 g2 R* N P
end
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;; Initialize the global variables to appropriate values8 Q, w& H5 p$ w6 m
to setup-globals* _! _, o) `7 L- r' u; }
set current-light nobody ;; just for now, since there are no lights yet
8 r& d8 M x' b p8 T' T set phase 0$ M6 F+ k+ {6 s) q3 `9 C. Q
set num-cars-stopped 02 y$ y& Z o& `
set grid-x-inc world-width / grid-size-x
( r( |' p7 V* u+ {- _% w" D 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
/ g y- ~. o) M- | set acceleration 0.099
4 i3 u# R) {, a- c, pend
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* \" J& t I; q1 g# H;; Make the patches have appropriate colors, set up the roads and intersections agentsets,# ?' E7 m0 @( e6 V
;; and initialize the traffic lights to one setting
/ b" j$ v" u+ M8 \9 Lto setup-patches6 G" v4 G/ v% ^; a" [) D
;; initialize the patch-owned variables and color the patches to a base-color0 v- ]/ C; k i$ B2 |
ask patches
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( q9 _/ M' L+ J+ V1 K" O- w set intersection? false" N+ |! N$ U5 S9 b* K- P
set auto? false* `9 G( M3 T! b$ n+ q: P
set green-light-up? true
. u) B, g/ U) b* c9 ? set my-row -10 b: f9 y" B, {1 N" K
set my-column -1
1 b6 w4 R" k3 i1 o5 V" f0 ^ set my-phase -15 o- h: a# O9 m6 f. Y B
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets; K$ e$ @& C, H# k. I
set roads patches with7 K0 X0 C5 g+ W
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or$ k; a% `9 V5 P8 x+ v
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
; l8 U" ~ A% v set intersections roads with. ^$ A/ i* o- b$ `
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
' l. y9 P5 j9 m$ m6 g (floor((pycor + max-pycor) mod grid-y-inc) = 0)] ] n1 o. G$ b: A c9 K7 A
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ask roads [ set pcolor white ]
' {. r0 H5 B4 p setup-intersections* Z7 z0 m% s2 M4 k& a0 a
end
, s& {4 n k" l/ ]6 m- `+ d其中定义道路的句子,如下所示,是什么意思啊? M' n* c5 S( K3 c ]
set roads patches with- W5 p# h) l* A! Q
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
+ x6 y/ D" l3 Q" R (floor((pycor + max-pycor) mod grid-y-inc) = 0)]' q5 ^0 q! l, }
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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