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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 X3 v- p. a( S# Q4 t) xnetlogo自带的social science--traffic grid这一例子当中,
( i; X; r$ s2 p; h- kglobals, Y4 y% o6 ] d7 Y1 ?
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4 c5 r R `5 h" l grid-x-inc ;; the amount of patches in between two roads in the x direction& v' O1 N4 M9 {' t! {9 `
grid-y-inc ;; the amount of patches in between two roads in the y direction
1 r% t- P2 q& Z7 ]" F5 H, a% p acceleration ;; the constant that controls how much a car speeds up or slows down by if
. D* ~5 z5 B, Y& O; B5 z ;; it is to accelerate or decelerate
' Q3 d4 g1 K8 |3 a) [) ] phase ;; keeps track of the phase3 Y/ v0 D5 v1 c0 ]2 R
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
6 T: K+ k# q# h' d current-light ;; the currently selected light
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5 u3 t' d; K+ [& u$ C ;; patch agentsets" A5 L4 w( s2 ^5 u3 d1 V- ~
intersections ;; agentset containing the patches that are intersections: t+ f8 W$ q! Q
roads ;; agentset containing the patches that are roads# n: J$ w0 {& j& u: Y; f
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* L$ ~1 [8 s) m% h7 hturtles-own
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1 Q9 n" n7 L, ^! l( a& @ speed ;; the speed of the turtle9 m8 p" f# b5 k. T
up-car? ;; true if the turtle moves downwards and false if it moves to the right- i8 V9 N# a7 N; D4 S9 V
wait-time ;; the amount of time since the last time a turtle has moved
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7 r# L2 t4 k. rpatches-own3 C0 r/ ?+ l. g$ E, u# w
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intersection? ;; true if the patch is at the intersection of two roads
' ~: i% W6 O; ~$ M [ green-light-up? ;; true if the green light is above the intersection. otherwise, false. F; ^9 Q P% `9 X6 e$ o I
;; false for a non-intersection patches.3 P. m+ C) F! o' K4 @# M5 s
my-row ;; the row of the intersection counting from the upper left corner of the
% E1 v! H' |9 y' S* K1 b0 b ;; world. -1 for non-intersection patches.
d3 v/ _0 i# D' D- ?' P& A- ~ my-column ;; the column of the intersection counting from the upper left corner of the* d1 Z" g" D% U8 j }
;; world. -1 for non-intersection patches.* m( L, f3 N: n5 `; G. ?
my-phase ;; the phase for the intersection. -1 for non-intersection patches.( m$ p- ^3 Z6 X ~% j
auto? ;; whether or not this intersection will switch automatically.
- m1 M" ~. \% |: [0 i ;; false for non-intersection patches.
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: O+ d- L. N8 ~& B;;;;;;;;;;;;;;;;;;;;;;! Z# _/ Z( h1 k% H. a1 o% k1 ?
;; Setup Procedures ;;" h- K' M# |$ g2 M+ o
;;;;;;;;;;;;;;;;;;;;;;9 \3 g8 E4 o. @. B! e
+ w t, I# I" {0 h( M) \;; Initialize the display by giving the global and patch variables initial values., B6 A; L$ Y1 q- L( d; G7 v
;; Create num-cars of turtles if there are enough road patches for one turtle to8 @; A% X# s# V; F( V: s
;; be created per road patch. Set up the plots.2 Y% b+ i- x- d/ l0 l2 Y2 d9 ]
to setup5 ]" N& ~! x/ I$ x' O* M
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setup-globals, j+ d, C9 p# j
) }6 h) w, g, M7 V" @ ;; First we ask the patches to draw themselves and set up a few variables4 H3 S; b+ ^2 U) ]8 A% K
setup-patches
% j; e6 F* I& J( `* c/ p8 t make-current one-of intersections
/ o) z4 ~ C+ S label-current
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9 q/ [$ j# D; O/ a1 i6 P/ } set-default-shape turtles "car"
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, G4 H3 r" F6 Z( ]0 ] if (num-cars > count roads)9 j. E- C- G, V& l+ Q
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user-message (word "There are too many cars for the amount of "
! E; R% P3 F6 _. u. m; m8 ?: l "road. Either increase the amount of roads "
5 W5 m# z" K+ M" u8 a8 Q "by increasing the GRID-SIZE-X or "* B5 @, ?: i3 i
"GRID-SIZE-Y sliders, or decrease the "
! z' s0 @% l. [* g% d7 S "number of cars by lowering the NUMBER slider.\n": A* S* h) f* h. D2 W( Q
"The setup has stopped.")) ]: E& s: H2 p% g
stop! ~' t0 M3 d& c- k5 U: q
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color& m; `' W3 `3 A+ n5 y! Q
crt num-cars- H {! a0 F( i, Z0 N
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8 ?' t5 @/ G' _" \ setup-cars4 }5 Z! f: @3 c. v
set-car-color9 J& z" O! y% z6 E
record-data
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: L1 ]. o. F$ }( U5 n% p+ k- h ;; give the turtles an initial speed% J7 w' Q) _3 s M8 O ~* ~
ask turtles [ set-car-speed ]
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, j. j) M- O# F2 b0 ^8 f reset-ticks
/ }4 U; T |# ~end
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, v: D1 D0 t$ \& M;; Initialize the global variables to appropriate values' F( v- B9 a7 M( L6 W
to setup-globals
. L8 c0 d% I3 Q9 A, J( _! u0 v set current-light nobody ;; just for now, since there are no lights yet$ d/ D3 {: `: r
set phase 0
: D9 G' N# D8 V& W+ R% D" R3 k set num-cars-stopped 0
* @6 _. C& n* S0 b, y4 j& w set grid-x-inc world-width / grid-size-x
- X3 N \/ H% A7 R3 y0 ^ set grid-y-inc world-height / grid-size-y
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5 h0 _3 g+ A X" u: ]" O ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary7 B( ?: b' G8 S) h/ Y' `
set acceleration 0.099
" i h6 p) s6 i$ S. L7 L5 R7 mend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
- q' ~/ Q4 W( l& B( R7 B- h;; and initialize the traffic lights to one setting
: s/ G3 Y; U$ M! k! a2 ]$ L: ato setup-patches, z$ F+ e4 t7 Q* g9 T9 ?% z% z0 a, \
;; initialize the patch-owned variables and color the patches to a base-color
( t% X3 F j6 a: Q4 F0 `- Z! T0 B- F ask patches
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/ }6 ~ a: N# ] set intersection? false
" X }$ z C& H) B' A set auto? false" D) z- q, W, C3 \$ H }
set green-light-up? true$ X0 S# n' C( j7 u
set my-row -11 u7 ]: K2 [5 f4 W
set my-column -1, G; }$ c/ H: g4 K# w9 g) K7 T
set my-phase -1) Z. v; `' m" }( ^
set pcolor brown + 33 ^+ L. d# `& ^6 r# [
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;; initialize the global variables that hold patch agentsets+ N C! P2 X' S7 Z( V. E D" `
set roads patches with
# }0 p5 F1 O& Y* U& F1 f! H [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
6 p0 ^, l: }3 A6 k# ^3 Z (floor((pycor + max-pycor) mod grid-y-inc) = 0)]8 t! A) Z) C% [3 {) v/ {. [: y
set intersections roads with2 ] `- f' v+ M$ ?9 w
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
l2 A6 ]8 v9 q (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]: I5 P6 E/ P3 n$ [
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?$ u+ ?, S& [+ ^$ f, v5 ^% H
set roads patches with5 n3 Q- F) V% A( N/ ^& |" i2 x
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or0 t/ p4 ]8 ], i6 V
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]# P2 H& ~$ U/ ~8 F2 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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