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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 L. L( ~8 }- v" i- d4 s3 {netlogo自带的social science--traffic grid这一例子当中,
/ j, `* ~+ ^( [+ j7 m/ r% ]globals) ?8 R2 h: ]+ M- ?
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4 h9 k6 Z5 N1 b grid-x-inc ;; the amount of patches in between two roads in the x direction
7 e' F( g. E7 J: s. M I* s* Y2 z) C grid-y-inc ;; the amount of patches in between two roads in the y direction' Z2 _! G c5 _5 G3 R
acceleration ;; the constant that controls how much a car speeds up or slows down by if
( x5 H6 B- e) G- q( D9 N8 s j& w" O( | ;; it is to accelerate or decelerate' x8 t; B- f7 C! ?
phase ;; keeps track of the phase
6 Q, c0 r) `) O4 Z7 [ num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
& C2 g6 k" K+ d+ O3 Z current-light ;; the currently selected light+ ^% G3 R3 y2 g# H
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;; patch agentsets
: p- c3 J/ V6 H8 y9 C intersections ;; agentset containing the patches that are intersections
6 I# N0 m$ x7 a! [ roads ;; agentset containing the patches that are roads$ y& p6 _& H8 @2 C
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turtles-own
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speed ;; the speed of the turtle2 w: t p# Q5 ]; |
up-car? ;; true if the turtle moves downwards and false if it moves to the right7 V& E/ t: ]4 B6 T
wait-time ;; the amount of time since the last time a turtle has moved$ }) V/ |1 L( y9 r3 r# o
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$ f w3 }" \/ r t: g* hpatches-own
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intersection? ;; true if the patch is at the intersection of two roads6 v2 n) f2 {$ k2 f8 v
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
: N+ Q i$ J$ S ;; false for a non-intersection patches.
5 f7 c+ a' ~) V( }6 v my-row ;; the row of the intersection counting from the upper left corner of the/ ?- I# t* U6 o& ^
;; world. -1 for non-intersection patches.+ A. N- \. K& X/ \7 W
my-column ;; the column of the intersection counting from the upper left corner of the
% L; p! f0 @2 ] ;; world. -1 for non-intersection patches.
9 Z- G5 f w3 q0 q$ }3 u. N my-phase ;; the phase for the intersection. -1 for non-intersection patches.
+ E* h; G/ n& I5 p6 s4 D auto? ;; whether or not this intersection will switch automatically.! C1 y( [: ], Z) ]
;; false for non-intersection patches.4 \" H/ x( v. R$ V0 G9 x
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;;;;;;;;;;;;;;;;;;;;;;6 s: z; d8 R9 b7 _0 Q
;; Setup Procedures ;;/ S, o8 L6 S1 ]6 a
;;;;;;;;;;;;;;;;;;;;;;5 o1 r9 R# c, F6 k
5 z3 H) r/ j* U5 g5 q;; Initialize the display by giving the global and patch variables initial values.$ f; }% S5 z6 J5 N1 j" F
;; Create num-cars of turtles if there are enough road patches for one turtle to2 j: s9 @8 e; z
;; be created per road patch. Set up the plots.5 y3 F4 ~$ @' B" O9 U
to setup9 E8 j7 p$ |! e* p/ v% Q, f" x
ca
5 a; f! @# p4 g% O% w( R: U, ^ setup-globals
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9 p8 S" S$ j6 z8 k# j ;; First we ask the patches to draw themselves and set up a few variables
: U- o/ r7 T7 r( F1 D1 W1 y2 a* B; ` setup-patches
+ E3 C" l: B E; V. L5 c! { make-current one-of intersections1 C" l- f) u1 {
label-current" Y: S7 {! U- j+ M& ?5 ` }5 A0 U9 P+ u3 o
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set-default-shape turtles "car"
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if (num-cars > count roads)- s+ F* p+ g! F2 d2 f: ^
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user-message (word "There are too many cars for the amount of "
1 b) A" y- j% _# ~" D/ F "road. Either increase the amount of roads "
6 n+ l6 g% @, }8 @4 G; S "by increasing the GRID-SIZE-X or "" I" e" l- z) ~$ o
"GRID-SIZE-Y sliders, or decrease the "( s7 m5 a, l9 n5 Z4 r; f
"number of cars by lowering the NUMBER slider.\n"# A, G1 K- {/ @! ?
"The setup has stopped.")
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color' U) M0 W; }& Z) t2 W
crt num-cars6 W% \4 ~% E* K% t+ O: p. `
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3 l, Z$ j; @+ C2 b. ?/ R, c. ~ setup-cars
$ _0 q" D Z- T9 z6 A4 c set-car-color e8 L+ ?4 w; G5 k, q
record-data7 [% F: R' S# q3 L# K2 ^
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;; give the turtles an initial speed
8 O! f* K0 a: M ask turtles [ set-car-speed ]
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reset-ticks
# t% E1 G- p+ F/ \3 B0 I% g. m$ ?end \, L' ]$ H9 O. i0 k: o
. n6 G& y8 X4 u9 N; M* P;; Initialize the global variables to appropriate values% ~+ }% I. a; ~$ d9 }% i
to setup-globals
9 s; O$ q: G7 p, [4 g8 G$ t set current-light nobody ;; just for now, since there are no lights yet& U8 f5 `. @% W! `3 d
set phase 0# O1 u6 H/ Q; K. N* Q# F
set num-cars-stopped 0
% F0 t% f& K( F' {; f- {- P6 `: ~ set grid-x-inc world-width / grid-size-x6 P8 c/ v; B# `1 W! G5 h4 O
set grid-y-inc world-height / grid-size-y
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) P7 c+ G* X1 |1 K. a% J, _+ | I' Z ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
5 O* n% b8 l9 P/ R0 L! `$ n% ?6 C set acceleration 0.099
4 i7 s6 b: i0 o" mend: ?1 U" B: H0 @. e) U
$ U% `$ y3 r0 ^9 W: r4 O: r$ {;; Make the patches have appropriate colors, set up the roads and intersections agentsets,) H* y1 k! m; U- K1 r3 o
;; and initialize the traffic lights to one setting3 }8 _9 d, b; l% D; h) Z
to setup-patches. h) x, L1 h( h, r1 i. B- X
;; initialize the patch-owned variables and color the patches to a base-color
2 i% g, V$ L! e; m6 N8 I ask patches! [: V3 C$ B. _. |8 r E z, m
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( P/ C9 K0 F0 q% C+ G6 b& ]* ` set intersection? false; D8 g0 ]9 }9 v Z
set auto? false
, u/ W7 ~3 j0 b0 ~1 M6 u" g6 a8 |: z2 A set green-light-up? true7 t8 U; h2 M( E0 I% Y# \6 y
set my-row -1
& [. }0 Q+ P" d; F. ^ H8 r set my-column -1- L7 R ^ ~, X. _7 J% ]7 Q2 C
set my-phase -17 V" A' L# s) x' i' G
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
' y, ~. ?" U2 b set roads patches with2 Y4 h1 I; h/ W" g9 n
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
) E K9 X& b8 d% ~8 e (floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 i8 D* j! {; h5 F
set intersections roads with! k, x5 Y# p/ p8 ^! C: s
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and" h) K5 }$ b, T' q' L1 i( W3 A
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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! L0 |$ i, D4 R0 K% n# k. B& \ ask roads [ set pcolor white ]' m. c2 Y3 T% W% n) G$ v4 {) h
setup-intersections
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5 ?; c, T6 f/ Z- Y2 X3 X其中定义道路的句子,如下所示,是什么意思啊?
3 K* T" G( d, |+ [" W% i% p: O set roads patches with6 ]3 @9 O8 a+ S: ]
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or0 m" L8 x' s1 ]. t2 g8 h$ V0 V- c
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]" ~0 m1 z. x1 L% D" T7 f
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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