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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 C6 W& i( y. b( P @; e; gnetlogo自带的social science--traffic grid这一例子当中,
% F1 |5 j7 [' B- @! tglobals# E7 q, O" q8 A- r
[
& Y) v. T) t1 Y: G) V3 _: O) p grid-x-inc ;; the amount of patches in between two roads in the x direction
H& N6 j8 J8 F" ^/ K- Y, u* Q grid-y-inc ;; the amount of patches in between two roads in the y direction _* E5 v* x6 g* u2 S9 I% ]; T
acceleration ;; the constant that controls how much a car speeds up or slows down by if
. G e# ~7 O( o8 d ;; it is to accelerate or decelerate3 t, |: K, `- r4 Q
phase ;; keeps track of the phase4 j, T! y! p8 i1 d; d
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
% N, y y9 Z/ K6 ]+ @6 f# l current-light ;; the currently selected light
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# B6 X. \7 w- G2 M4 ^ ;; patch agentsets+ x5 t& n% h- a2 Y4 I. x
intersections ;; agentset containing the patches that are intersections4 I: p7 ?8 X' q) ]) M' X& l# j
roads ;; agentset containing the patches that are roads
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5 b! l$ R- u6 H' R. i" E, ~turtles-own9 j1 O, ?3 {. Q- p) ?0 e3 g' _
[" ?+ w% ]9 o1 }' ]
speed ;; the speed of the turtle
/ ]2 o; T9 o8 z8 e, k: } up-car? ;; true if the turtle moves downwards and false if it moves to the right: b, @ R2 L; ]% E. y
wait-time ;; the amount of time since the last time a turtle has moved9 ^4 a& y9 }9 f# N8 {" r
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/ I8 A e: J) f4 M# apatches-own
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intersection? ;; true if the patch is at the intersection of two roads: _3 Y) U, V9 H8 R) L8 Q
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
* e, L' P3 t* U4 R ;; false for a non-intersection patches.
, H" r3 i2 U- }5 E5 h: K) h my-row ;; the row of the intersection counting from the upper left corner of the
) m+ C) H" T' [ ;; world. -1 for non-intersection patches./ b5 J$ O( c9 ~& O
my-column ;; the column of the intersection counting from the upper left corner of the
: e, \# H0 @) E ;; world. -1 for non-intersection patches.
( O, w( M% s8 T8 r4 m6 J my-phase ;; the phase for the intersection. -1 for non-intersection patches.
# w0 r& F Y& z auto? ;; whether or not this intersection will switch automatically.
" ]" ]! h; R9 y" B ;; false for non-intersection patches." t9 ?" U7 s% e2 p: P3 s9 p' [
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/ H' e' @1 P: d;;;;;;;;;;;;;;;;;;;;;; e6 C$ m6 x" ^1 `6 a. ^
;; Setup Procedures ;;9 _. Q: k0 d; Q7 j& J
;;;;;;;;;;;;;;;;;;;;;;6 m) X4 Z, B0 t. d" Y; O. t2 ~! l4 S
- |+ d' ^) r. |3 S;; Initialize the display by giving the global and patch variables initial values.
" g1 x5 K! w! T3 Z1 ];; Create num-cars of turtles if there are enough road patches for one turtle to, ^+ `3 g% S4 [7 j& B, b; S& G
;; be created per road patch. Set up the plots.4 `' T$ _& c! Q) w) v
to setup
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2 N! y) q! C- ] setup-globals
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;; First we ask the patches to draw themselves and set up a few variables/ Z' i4 ~& [- i# H) @2 J
setup-patches
$ A+ z7 B6 R6 v( P make-current one-of intersections
* r1 I, A. v& g/ B7 }. H label-current
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set-default-shape turtles "car"8 _1 q* f8 f, w! P2 T3 I5 y
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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 "- O( Z2 {" A5 H# b. d6 C
"road. Either increase the amount of roads "
$ b5 _# N* d# y) ` "by increasing the GRID-SIZE-X or "- R- y5 w! u, u: r2 R7 I
"GRID-SIZE-Y sliders, or decrease the "
7 {) J$ B# A' r9 D) [( q6 V "number of cars by lowering the NUMBER slider.\n"1 [! J" w% ^ p# ^9 N3 x
"The setup has stopped.")
\( S! y Z& G* \; K. e stop1 W' b: h. c. z8 i6 r
]
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
3 Q, [& r2 Z9 ?" s7 u l5 a crt num-cars
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setup-cars
8 @' E' `1 u8 _ set-car-color' t' @. v) t- A% n
record-data7 h9 K% r; v' }
]
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;; give the turtles an initial speed; S+ u+ E' I" I1 I8 ?3 i, F% H
ask turtles [ set-car-speed ]. a9 v: {* K, e( v* k
6 r# V/ ~7 Z; E0 w1 N. b reset-ticks/ g/ n B" r0 {" g) D6 a% M
end: H8 ?, a9 e& V
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;; Initialize the global variables to appropriate values. x9 Q0 I7 U9 | Q( q
to setup-globals
# i$ D* ~& T$ k9 l! l" d set current-light nobody ;; just for now, since there are no lights yet' x/ ?. a# W* i9 }7 v4 |: K
set phase 0
- m. a: T& _7 Y! p set num-cars-stopped 0
5 j! |* b' d( E! d2 X3 V, ]( d- t, ] set grid-x-inc world-width / grid-size-x* w& M# M( i" T
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 boundary0 D2 A; ^& w8 B7 n& U
set acceleration 0.0997 I, X/ n( L6 C7 p7 `
end
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9 w2 d4 ^* |" J) y3 };; Make the patches have appropriate colors, set up the roads and intersections agentsets,& p- ?3 ?: a& h- Q( u- ]
;; and initialize the traffic lights to one setting
7 w: ]/ A; ~9 t" q1 G, W' [to setup-patches9 w; l7 f) r. L" m) p
;; initialize the patch-owned variables and color the patches to a base-color% w' c; ^- ~1 h$ h; w: V
ask patches
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set intersection? false5 n; M& S! q" O
set auto? false6 Y* o; e; h. d
set green-light-up? true1 u- b* S ~+ I) Y4 k% \
set my-row -1$ J# V( Q o* N1 h
set my-column -15 `# O, g& W9 k" U9 y
set my-phase -1" A4 ^$ \$ }2 [; W& T
set pcolor brown + 3
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. q# F/ O5 A3 s2 X" q% h ;; initialize the global variables that hold patch agentsets4 S( T7 K4 H* o( |7 P) n: s* G
set roads patches with
6 ]+ g% B: r% ^- q& q; U( J [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or- B4 q8 I4 V" N' J/ r- q
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]$ V& f+ L4 @! S. E- b
set intersections roads with* ~3 c) @. l( j; e* h
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
' X8 t# }! q) Z( t' e, I (floor((pycor + max-pycor) mod grid-y-inc) = 0)]5 X4 K, c0 [ z0 ~; T \) |! @- c# z: ~
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ask roads [ set pcolor white ]1 j! I( t# Q) ]: }9 _# F
setup-intersections. t' \5 V1 k1 `3 k, _, a7 w( V
end
# b$ u2 [; g. X" K3 Z; F4 I& N其中定义道路的句子,如下所示,是什么意思啊?3 t4 e! H4 h8 J* q$ D, |% d; l
set roads patches with" J- V5 G4 R* ]: r7 |5 h- C, H
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
8 H% x/ j" _6 e% R; R (floor((pycor + max-pycor) mod grid-y-inc) = 0)]1 e5 R$ z* Y# Z# `( B: f8 R8 y
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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