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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。
- E" ?5 k' F7 U5 A; R' Y. |2 enetlogo自带的social science--traffic grid这一例子当中,
7 Y6 J+ F0 J+ J" Iglobals
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- ]0 k& h: t! g7 {9 ^6 ` grid-x-inc ;; the amount of patches in between two roads in the x direction7 t7 L# g4 [) R' f8 `3 s' P9 D
grid-y-inc ;; the amount of patches in between two roads in the y direction v% f8 O& A3 k+ D3 @- U; v: n
acceleration ;; the constant that controls how much a car speeds up or slows down by if: Z% P4 n. ^* x% h% b t y
;; it is to accelerate or decelerate/ |# _- k1 f' w7 a' ` N5 M
phase ;; keeps track of the phase! e! D( m5 A8 ^% H# U$ O3 a% A
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
" w- q+ G! v4 H" w" U current-light ;; the currently selected light4 M/ C9 q/ \3 `! w2 p, X
X+ _: t; X. c! { ;; patch agentsets
]$ t7 ]9 I, R9 ?/ X+ }% H7 J' x intersections ;; agentset containing the patches that are intersections
: ]# I3 v" k; o: v% ]- V roads ;; agentset containing the patches that are roads$ d/ A5 e5 B6 ^* P9 ?5 I. ^
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7 f. T: v; u4 ?turtles-own0 s* p: q4 M. g j( {& B
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speed ;; the speed of the turtle- \) E4 i# p# v; k( l4 Y$ ]
up-car? ;; true if the turtle moves downwards and false if it moves to the right1 v5 L/ K, ]! {2 b7 [$ W
wait-time ;; the amount of time since the last time a turtle has moved: ~ a& c8 r8 m( N% n5 Q& O) z& P) ]1 A+ W
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patches-own; W3 z: d3 d" A( n7 g) C2 y
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% _0 s- ~* b3 Z0 [1 K intersection? ;; true if the patch is at the intersection of two roads, b0 [; o, W6 N' G7 | `( F
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
1 r# e p" q% P( B ;; false for a non-intersection patches.
3 g1 E' G6 S7 d+ o my-row ;; the row of the intersection counting from the upper left corner of the
2 z0 c# u% U+ M# ] ;; world. -1 for non-intersection patches." [! S# X9 p5 k7 t4 k1 G! c
my-column ;; the column of the intersection counting from the upper left corner of the
( a5 N* W; B+ Y% Y: e) R4 ? ;; world. -1 for non-intersection patches.( P; L5 [4 }+ f
my-phase ;; the phase for the intersection. -1 for non-intersection patches.3 f8 z4 O" i! |
auto? ;; whether or not this intersection will switch automatically.6 V. B6 ]. a8 J5 c( J& C6 @ N, S
;; false for non-intersection patches.) n4 {7 D$ n5 r& Q) E8 s& @' D: k
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;;;;;;;;;;;;;;;;;;;;;;4 ^% T7 l/ V8 V$ D
;; Setup Procedures ;;; x8 m5 Y. A. \; r1 ]6 j* o
;;;;;;;;;;;;;;;;;;;;;;
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3 j& x `! n3 B0 H* x; x+ w;; Initialize the display by giving the global and patch variables initial values.; e( X. F& f2 S$ `; q
;; Create num-cars of turtles if there are enough road patches for one turtle to
# M/ [3 m5 B U/ ~ v, e;; be created per road patch. Set up the plots.
/ w- `: X8 V- uto setup2 ~5 [# Q% Y6 M) E5 c8 i( C
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables
8 K9 |# L4 ^9 [1 b setup-patches9 H0 k# j# t; W# m: U
make-current one-of intersections3 O7 J4 P4 @* P% U& b! ]/ [' j
label-current+ n5 `* E7 }1 t: [" j
6 X+ |( ]: K! L7 a6 P set-default-shape turtles "car") [" M1 A7 F0 x6 `$ H) ?3 }$ ~
$ k# q- Y* n! s, m* K! Q. H! c, {& v if (num-cars > count roads)
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" F1 E7 W4 m7 _& W user-message (word "There are too many cars for the amount of "5 E6 h5 {2 ?- H4 J8 K1 q8 Y
"road. Either increase the amount of roads "
# c$ D5 V& f. n5 q7 J "by increasing the GRID-SIZE-X or "" D# ]7 Q) G$ L. y
"GRID-SIZE-Y sliders, or decrease the "
9 l# e' {# t- L5 k: o "number of cars by lowering the NUMBER slider.\n"
, V8 _& V9 M/ v) x+ v1 r "The setup has stopped.")
. l, p! b! v# y7 F7 s) t stop
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* Z3 g! m0 q, b- Q6 L, @& { ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color% }* J I$ @( c3 U& `1 f7 X
crt num-cars; v8 |! Q2 K# k8 [
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( h& V5 }) u3 K% L/ \9 t% ~ setup-cars
% ^: M2 F& C6 v set-car-color8 o6 W8 Z" ]% h& ^8 _
record-data
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?, m8 `: P! X% a ;; give the turtles an initial speed/ U& Z( K$ u0 V, i* L8 D
ask turtles [ set-car-speed ]
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reset-ticks
3 n' ?9 P8 }+ A4 Eend
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# |) I: I! ~2 i& p) E) D;; Initialize the global variables to appropriate values( _0 B" ^7 g5 K" m9 u$ ?
to setup-globals
# P' W4 z/ Z% t4 \5 _ set current-light nobody ;; just for now, since there are no lights yet9 |5 `7 D- w& L! Z' V2 @2 r
set phase 0% q# E, j! l; d$ c Q- X
set num-cars-stopped 0
5 E+ E8 O* Z- b: \3 Y5 }$ X set grid-x-inc world-width / grid-size-x
: g; l! [/ ]0 `* |1 Q1 U; E set grid-y-inc world-height / grid-size-y/ I+ ~3 y( t2 ?
0 x2 g. x4 g4 o0 U w ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary% z( F) k0 O" ^
set acceleration 0.099
3 Q! ~2 {) s$ B7 Z" R- Aend
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& F1 \5 l) | W, I4 R$ \;; Make the patches have appropriate colors, set up the roads and intersections agentsets,2 ^+ }/ X7 T* G0 a9 L* |+ `9 k
;; and initialize the traffic lights to one setting
* N- x1 a8 S! |1 w# J. Z* O; f, |to setup-patches
1 M I- g" }2 L# |2 t ;; initialize the patch-owned variables and color the patches to a base-color
* L3 z; I1 y- E1 _: F ask patches$ ?# n$ N: j. w- |2 |$ R% s
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- ]; b6 n& S) ]+ m7 I set intersection? false
6 }8 w+ U7 W/ S$ S set auto? false
* ^/ u& t G! C$ [& ? set green-light-up? true
2 P' g" S8 Z: B7 z* |3 F8 ]+ q set my-row -1, e& t- q+ `! L4 S0 ^! w' Z
set my-column -17 A! i) \1 g/ ]
set my-phase -1
4 J+ Y- O8 g: } set pcolor brown + 3
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- b& |( R* H) g. q& ^ ;; initialize the global variables that hold patch agentsets
, ^. _! g# h7 X6 J& b set roads patches with/ g8 D+ J( g/ j
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or' c4 n) V- R. y2 ?/ ~
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
, ?% p- ]: R: m& y8 y- [- ~+ { (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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$ E) A; C: a# ~1 j6 H9 A ask roads [ set pcolor white ]
F' K/ r- q! g: ? setup-intersections
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$ y/ O- t# G3 A- e4 i其中定义道路的句子,如下所示,是什么意思啊?& c9 W+ O. z6 u
set roads patches with
; }) I8 Q' V3 e [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
. N. l: v2 s% } (floor((pycor + max-pycor) mod grid-y-inc) = 0)]" c9 x7 \% A3 h1 [9 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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