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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。
7 j# l* s+ t4 A8 H7 t2 nnetlogo自带的social science--traffic grid这一例子当中,
* [( o/ U C% {- R9 d& mglobals5 ~0 C/ Y2 P0 _- p1 t; k3 D) [
[
: i4 |. H4 J8 I' F8 x( q grid-x-inc ;; the amount of patches in between two roads in the x direction
) B6 Y+ o0 r2 u4 r* Q! N grid-y-inc ;; the amount of patches in between two roads in the y direction% B$ r6 q5 f+ z' K3 Y" |$ ?
acceleration ;; the constant that controls how much a car speeds up or slows down by if! F' K! @' d: L+ Z7 P3 [( \
;; it is to accelerate or decelerate3 c4 r) Q7 _" G# ]' t' D, X6 }! \1 X- z
phase ;; keeps track of the phase! P$ l# p2 k0 q* o- W5 _
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure$ L) ~' V0 A2 X' W/ ]5 }
current-light ;; the currently selected light
0 g3 q# v- I, o6 l5 g7 c, S3 `( j* C' F* G( x
;; patch agentsets
# P& H! [3 y: c intersections ;; agentset containing the patches that are intersections: b& V, ?* y& Y5 e! D1 w5 K) D
roads ;; agentset containing the patches that are roads- I6 y- n; o( B7 i; ?
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$ I* O+ Y. x' S5 D) Xturtles-own9 N5 o2 l( ?; g! W0 ?
[
6 W3 k$ e! S$ D speed ;; the speed of the turtle; b, A, ?" `+ t4 r t4 C
up-car? ;; true if the turtle moves downwards and false if it moves to the right' S; a+ r3 i# U4 G' M( k3 F
wait-time ;; the amount of time since the last time a turtle has moved6 \7 ^" O' a: X! L" X) ]0 x& l! G
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$ n7 z; f* ` F% upatches-own$ {9 Q: u' F, ]5 _$ m; |( k* z
[
9 } Z, h% Y& M" Q/ T2 e4 r. U, R intersection? ;; true if the patch is at the intersection of two roads9 a' @# X6 N: Y9 Y$ c! D: B
green-light-up? ;; true if the green light is above the intersection. otherwise, false.4 z$ P& `2 ? h. x: y* N( |0 t; [
;; false for a non-intersection patches.- A" Q2 ]) l# Y3 Q
my-row ;; the row of the intersection counting from the upper left corner of the
( R! R/ e/ @" |1 ^- U ;; world. -1 for non-intersection patches.: n' i4 U4 W; r" \8 ^" W# J
my-column ;; the column of the intersection counting from the upper left corner of the6 h3 i6 `9 N3 X" E0 Y$ |5 M! K
;; world. -1 for non-intersection patches./ K4 [7 p! m# k3 {( ^: P
my-phase ;; the phase for the intersection. -1 for non-intersection patches.7 E/ [$ J5 p8 P) s7 X" z6 ]! w) [
auto? ;; whether or not this intersection will switch automatically.
' \$ `5 m% e& W- f! X$ C8 v* a ;; false for non-intersection patches.! G3 r9 t4 o0 w! O9 u( p' j: Q% G
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1 W, N( X8 `7 |3 A1 z- x;;;;;;;;;;;;;;;;;;;;;;' U' v. o0 B) e9 L1 A* H
;; Setup Procedures ;;
# J: z+ q) P9 s; t5 V; O;;;;;;;;;;;;;;;;;;;;;;) f* _' _) s/ l* {2 Q5 ^
6 V7 f1 Q5 @! a# H+ S2 N;; Initialize the display by giving the global and patch variables initial values.
4 G. @9 z4 }; F;; Create num-cars of turtles if there are enough road patches for one turtle to
. @$ t& H4 @( c+ Q;; be created per road patch. Set up the plots.0 h2 r! ]9 g7 Z: K/ w( v4 }2 E
to setup. q. X; c9 l; v4 b v% G
ca
2 I X2 M1 y! G, J$ g) J* x setup-globals9 {8 p: r; k( W6 s
- |% ?: M9 ]4 J9 c2 J' s ;; First we ask the patches to draw themselves and set up a few variables9 d/ t+ l, x8 u. |
setup-patches1 B7 Z" W' m3 T
make-current one-of intersections% J; y& }6 s$ O/ K. P4 K, n
label-current& H) b/ o2 ?. n3 X
) R7 W+ ^ ~7 a) p) u% C) `" J set-default-shape turtles "car"
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if (num-cars > count roads)2 \$ y, d3 W) \6 c( c1 m
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7 C! x; I6 a" \) W user-message (word "There are too many cars for the amount of "
: W: Y) x$ x8 h- c. |+ L( b "road. Either increase the amount of roads "# C3 O/ z) y1 J+ A- ^( ^( F
"by increasing the GRID-SIZE-X or "" G' h6 a. s9 G
"GRID-SIZE-Y sliders, or decrease the "
" Z, l4 f# o( D/ C/ S+ c& s "number of cars by lowering the NUMBER slider.\n"
^. D" ]5 |: E6 v8 p "The setup has stopped.")
/ U+ B2 W' b) }% b" M% X: M% G stop& Q) r6 u o; `$ l) F* d7 S
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8 R( {7 C" N V- J# h1 H ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color) Z8 w/ V* p3 @" p% I
crt num-cars# I. m* ~! ^* P1 N4 y
[
! F3 ^: Z" D/ ~9 \& h setup-cars5 n& v; ]' R; w( L. ? e
set-car-color
" g2 L. A% S* W/ ` record-data
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2 s" v- K/ l( _- [; W) ]+ s6 \) \/ i ;; give the turtles an initial speed0 A4 g* n1 s. @$ z t
ask turtles [ set-car-speed ]% b# b: H* D( Q- K$ O, C+ H
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reset-ticks3 Y0 T9 V+ _' z* o
end
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;; Initialize the global variables to appropriate values- F3 A# _# E- M1 `. t! g; ~
to setup-globals
{ t3 b( j7 n& u# J) L set current-light nobody ;; just for now, since there are no lights yet
" S2 {% h% Q+ t9 z set phase 0
) X+ }/ ]* X6 B7 U set num-cars-stopped 0
# }2 _" c; G: y: L. T: q" R set grid-x-inc world-width / grid-size-x5 H1 P. ~7 x$ Q" @4 y
set grid-y-inc world-height / grid-size-y
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/ @! ~7 p( C( t6 v- C) ~8 r0 D( B3 P ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
' ]1 I6 M- Q, w4 E, U set acceleration 0.0998 e8 X- r$ a( J7 g
end, h, I. Z1 o; w H4 M3 i% i2 ~) T
% T' _" r$ q6 U- @; E2 w;; Make the patches have appropriate colors, set up the roads and intersections agentsets,* K3 \2 C; r- J6 N: Q
;; and initialize the traffic lights to one setting- g3 ^( V; [5 n0 R& b
to setup-patches: L8 a" t* q5 y5 [1 s3 z" u8 d& a
;; initialize the patch-owned variables and color the patches to a base-color
* o1 |' ^; y, H# y! S* L' K ask patches
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/ h2 D |5 _3 `) n$ u set intersection? false9 C5 I3 S* l* ?0 s4 O
set auto? false- t# a+ [0 O, |$ I1 V+ c# T3 F
set green-light-up? true6 T5 j2 e' n F+ P4 H& n
set my-row -1: `" [# e) _, }
set my-column -1
, A6 q' b& f1 h+ {2 D: @4 p set my-phase -1/ H& p c, N8 a' l1 _
set pcolor brown + 3
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5 F. D9 |! ^6 p" B6 a ;; initialize the global variables that hold patch agentsets
* p7 P5 Y5 u0 \6 i6 D set roads patches with, {/ m# }' D, N* y% s# B
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
+ ` R( P3 d: T' q, A (floor((pycor + max-pycor) mod grid-y-inc) = 0)]# q E$ s- y* n
set intersections roads with; _. |- } i5 k) n7 W( o) W
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
0 W8 N; Z2 |6 i! n (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]: v2 C9 Y) y$ o) y! y; e
setup-intersections
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其中定义道路的句子,如下所示,是什么意思啊?/ J- G. M* g/ U0 I G5 _* d
set roads patches with
" [& q ]3 c' _7 o/ z/ C [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or& i! ]; f; s+ ]
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]1 Z% @2 T$ v) v$ [4 z! [2 V
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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