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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。2 a a& v7 \- R( U7 N
netlogo自带的social science--traffic grid这一例子当中,
8 Z1 `- A( u! `+ |; m5 H1 fglobals8 [- |2 g& [7 H# [( p
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: e3 `7 }. O6 E$ Z! ^0 c grid-x-inc ;; the amount of patches in between two roads in the x direction
9 v# \) x' Q, E3 p+ `# k grid-y-inc ;; the amount of patches in between two roads in the y direction) J: [# c' E: b- B1 f
acceleration ;; the constant that controls how much a car speeds up or slows down by if
_ ~% j6 b ^3 Y ;; it is to accelerate or decelerate( i+ H( O4 Z; p( G4 _
phase ;; keeps track of the phase
) ~, Y7 u& k. h num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
4 L- [% Z( c1 W( F8 i. X$ {, W current-light ;; the currently selected light
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;; patch agentsets
+ G( L4 m S' i intersections ;; agentset containing the patches that are intersections
$ C: n( J9 y' X& f. S4 s+ ^ roads ;; agentset containing the patches that are roads
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8 O. S9 }7 o. W: mturtles-own: z9 @2 y9 g; U# Z
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7 }# \/ {9 a" z9 e) K1 x8 M speed ;; the speed of the turtle
2 W+ C8 f0 Z5 i- J$ _ J up-car? ;; true if the turtle moves downwards and false if it moves to the right
/ |# ]( a$ c2 m% [9 U4 h) D, N wait-time ;; the amount of time since the last time a turtle has moved0 J2 k2 }+ E5 ]' D; e, u
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( K }! t$ d5 [3 ]patches-own4 y3 `5 ^% m# D% ~6 N
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intersection? ;; true if the patch is at the intersection of two roads
+ Z) S& x F0 U2 i) w- S6 Z' K) R green-light-up? ;; true if the green light is above the intersection. otherwise, false.; ?1 X& Z5 @( {$ O: p9 |5 Z3 y) L
;; false for a non-intersection patches.
6 z, U. S( H. y { my-row ;; the row of the intersection counting from the upper left corner of the
8 P9 k1 q; [" j' H ;; world. -1 for non-intersection patches.! u" Q; ^0 a1 v2 ^% ?
my-column ;; the column of the intersection counting from the upper left corner of the
! x7 g* O3 k8 y9 t( m( z5 n2 Y ;; world. -1 for non-intersection patches." B+ F0 ?+ m6 l. m0 i/ B' a
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
3 f) d4 _0 q d8 W2 q- J$ @ auto? ;; whether or not this intersection will switch automatically.
6 Q+ X+ D* C! h. K2 ]+ j: f ;; false for non-intersection patches.7 q% E/ @& l+ X
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7 A, O# X7 P- u) A2 ^- y' h;;;;;;;;;;;;;;;;;;;;;;
6 K4 x( C' R9 |1 @) t;; Setup Procedures ;;9 b! {: r* Z0 \( L7 `2 I+ C
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;; Initialize the display by giving the global and patch variables initial values.
9 i6 F" c. p5 J7 }6 [;; Create num-cars of turtles if there are enough road patches for one turtle to4 n: V. D7 M' ^3 V. U8 _# R* d8 V& _
;; be created per road patch. Set up the plots.) M$ |. h9 j# l' X, m( r; h
to setup
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/ e! `5 g) S" F, }' I( ~! h& }/ ^ setup-globals
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) p: R/ J) I5 Z% ~$ j$ B ;; First we ask the patches to draw themselves and set up a few variables$ W* h+ s* O5 e
setup-patches
2 Y$ \( }8 d* U) D0 \ make-current one-of intersections: B$ r( T4 j- V; y
label-current
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set-default-shape turtles "car"% Z& ~& a/ g$ T5 U- ?: U
) l/ v6 w9 z+ j% w if (num-cars > count roads)6 p, y# c' x5 V+ M
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" o4 D: I$ N1 R3 L user-message (word "There are too many cars for the amount of "% m% t) a6 q' t# ~
"road. Either increase the amount of roads "" e& @: I& O, E/ f4 S
"by increasing the GRID-SIZE-X or "
& U/ \) Y$ Z* H; F9 T$ ?( X "GRID-SIZE-Y sliders, or decrease the "
. _$ j- a' S2 S& b. m" Q$ g "number of cars by lowering the NUMBER slider.\n"* ]% A I n" j' S, J
"The setup has stopped."): H5 k/ h0 m3 U
stop- w1 @& Y, f9 q0 N
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
! l5 M" D& b' E9 [( I crt num-cars
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# A" o* Z+ i- K: A8 N# X setup-cars3 V2 |5 ~& _& T# V
set-car-color
& e' z* d0 j! [ _( c8 R- q record-data
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6 P9 D9 c' a( i9 J" J3 C2 {& ] ;; give the turtles an initial speed
* X: q( w( F7 u' X: n- D% X. k ask turtles [ set-car-speed ] v) R, G1 \" P) }( s) ?
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reset-ticks8 v5 o& b7 m" Y9 V
end4 k3 N( i6 x5 V$ `, t: t
: B c: I8 e6 F5 i;; Initialize the global variables to appropriate values
: X& ?8 E, m+ a2 eto setup-globals
( c7 \' E5 V E( B: x% Y& ]' N# i5 x set current-light nobody ;; just for now, since there are no lights yet, b! d9 l+ d% o+ V. v
set phase 0
- S( J; o/ S" k. w( \9 z0 k2 d set num-cars-stopped 0
: Y, c2 C* W2 j8 B set grid-x-inc world-width / grid-size-x
$ G/ A [: g) r4 I! [/ Y set grid-y-inc world-height / grid-size-y
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7 l+ e7 P* ^% F: _4 G ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
" m- B& Y# a* `3 w7 N set acceleration 0.099
7 v/ ?" H: P* ?+ H- { Yend
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7 B" ]' i* e( r& T; Q% k;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
+ w, h( ~, f" C6 s;; and initialize the traffic lights to one setting
8 I' k1 q/ c; O& f7 l+ A. @to setup-patches
- o1 v. Y4 U# J% H2 n ;; initialize the patch-owned variables and color the patches to a base-color
5 z! a# ^! v) R2 B- ]0 W ask patches- \$ }# a# A. {1 C8 ?# T# ?
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set intersection? false, a0 s% H- d) T( C6 W. T
set auto? false! S; U$ {/ Q* N" k$ l
set green-light-up? true* \0 ^) @2 i5 h$ i5 A9 m
set my-row -13 @6 w* t; E5 J4 M4 A) y/ {
set my-column -18 K; O, m& [4 h0 n! i4 |9 ~, I
set my-phase -1; i( c/ B5 \ B* x) M" B/ ~8 j
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
, b8 I! R6 O$ }/ Z/ h set roads patches with
3 F& H% G T- p) h, O [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or) C; n4 n- b6 K" ?: N+ x5 b
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
0 O3 x8 n" `2 D set intersections roads with+ `7 m9 M& x; [( V/ t2 r8 C
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and: S% H6 K1 }5 @9 a: z
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
8 m3 T" \( `4 x6 P0 T. Z setup-intersections
3 c% J6 D! ~# \4 O: r% Q6 xend7 t. f' d% i4 n+ a! K$ J1 g3 n
其中定义道路的句子,如下所示,是什么意思啊?0 U) S) H$ p! D* w4 ?: R& W4 N
set roads patches with
0 W) w. m- B( J3 \" ?$ {) N [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or/ O: ~" X/ {4 b. x9 F% i, |
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
1 R( x& l. K, ] u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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