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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。
1 e1 b9 h7 }$ qnetlogo自带的social science--traffic grid这一例子当中,; Z& F( Y9 h8 g, ^# s+ e0 ~
globals+ N# v' \; ?, u: N
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grid-x-inc ;; the amount of patches in between two roads in the x direction3 I7 O& z9 }0 ~' v
grid-y-inc ;; the amount of patches in between two roads in the y direction2 K3 y! p3 m+ p( v5 O% X6 }! Z" l/ v
acceleration ;; the constant that controls how much a car speeds up or slows down by if
6 M, i _ M: M ;; it is to accelerate or decelerate
, \9 p( {# a* v) y: T phase ;; keeps track of the phase
+ V! R- i( J( C- i9 j2 Q num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure4 U# O) J8 k1 r: w( d6 f6 T
current-light ;; the currently selected light+ I: Z. g" Y3 u, V0 u# B
5 r4 e3 ^/ l* Z: ]6 s4 H( p$ \ ;; patch agentsets7 H! j3 T v0 C! W" K/ c; n g# ]
intersections ;; agentset containing the patches that are intersections
% R) K: { \; g5 a- I. n- \$ J roads ;; agentset containing the patches that are roads1 O, }; a+ P# }" K& I
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* V# \; `4 Q; C0 c) e' Dturtles-own3 I0 k3 K& i0 F- @" \
[
, |+ }2 N6 I. ~8 D7 _3 `& B speed ;; the speed of the turtle
9 Z) U H; Q9 ?, I! l0 D up-car? ;; true if the turtle moves downwards and false if it moves to the right
4 x, m0 Y% \3 ?- Q wait-time ;; the amount of time since the last time a turtle has moved
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, A8 X; u" g6 ~2 x* t Vpatches-own
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intersection? ;; true if the patch is at the intersection of two roads$ L) B8 U3 T" b, |
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
. a1 N0 j# s, T) E! Q ;; false for a non-intersection patches.
2 E4 y1 A. x1 x3 F) n my-row ;; the row of the intersection counting from the upper left corner of the5 D3 L8 ^2 { s# o' U/ @
;; world. -1 for non-intersection patches.
$ U( i* f1 T& P7 v3 k1 Z7 M% { my-column ;; the column of the intersection counting from the upper left corner of the% K! u) w3 L p8 f
;; world. -1 for non-intersection patches.
5 o) C) b4 Z: v( n4 D7 h, b+ U my-phase ;; the phase for the intersection. -1 for non-intersection patches.
$ F, t' s1 k0 |- [/ p auto? ;; whether or not this intersection will switch automatically.! r/ J8 k3 w5 w; c6 {2 o8 _
;; false for non-intersection patches.* L+ o- B, Y: u& e! N
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;;;;;;;;;;;;;;;;;;;;;;3 ] i% R) D; t l5 K
;; Setup Procedures ;;
. `4 ^" E: r( I: H;;;;;;;;;;;;;;;;;;;;;;) y, k0 z& f) w/ p8 S
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;; Initialize the display by giving the global and patch variables initial values.( J+ K: T" Z2 c! P
;; Create num-cars of turtles if there are enough road patches for one turtle to
1 g) `9 W" N4 Z* F) v% I;; be created per road patch. Set up the plots.# s( A) D' P9 ^( m3 s4 i$ y
to setup
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setup-globals1 I- h% p* r% t( S( h
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;; First we ask the patches to draw themselves and set up a few variables3 X5 O( ?6 z. \1 I! r
setup-patches
- q# v9 Y" b1 x/ f: Y. e make-current one-of intersections& N: A9 W$ A" S$ Y1 I
label-current5 I4 Q2 ]' @, J- U# J, W. s
# C* Y+ p/ t5 q3 o set-default-shape turtles "car"
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if (num-cars > count roads)8 ]8 j: n6 U: Q$ N" N8 B
[
) _# i. D0 Y# y% q$ E6 } user-message (word "There are too many cars for the amount of "
8 E. s$ e0 |8 z) n* k9 t "road. Either increase the amount of roads "% b1 \' x. i0 B, \2 q/ k6 K
"by increasing the GRID-SIZE-X or "
7 W$ g9 b5 J/ D4 a3 C. N "GRID-SIZE-Y sliders, or decrease the "
' h& i4 {+ F/ |* w+ A "number of cars by lowering the NUMBER slider.\n"
* G8 a2 f. D- j, w! z* u7 Q! S: O "The setup has stopped.")6 b" N6 f* R" `- [0 L1 y2 T) v
stop3 H! d" f* _ w* b1 e6 x3 R, m
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
* g, J' L, w1 g3 I( F' t; G$ w7 p crt num-cars
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; P7 B3 T: ~5 N9 f3 Z/ T: g setup-cars
! R0 ]. t7 B7 F+ ~1 A( N# D set-car-color6 k) z* q9 S" U' @/ a+ \( C
record-data
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;; give the turtles an initial speed. r; l v$ X5 T7 `9 U, y2 H2 T
ask turtles [ set-car-speed ]& M0 L' j* s; ~/ x+ @ d/ r
0 A) M1 S$ f9 d, Y/ W7 ^ reset-ticks4 |* E/ f9 J1 ^; i u+ `
end
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/ ^6 Z: ~7 S( `: R2 Q$ l( U4 Y;; Initialize the global variables to appropriate values% v' E$ t5 c6 N' H" i
to setup-globals- _+ {' ^7 T7 b% X) v
set current-light nobody ;; just for now, since there are no lights yet/ w/ K2 U! M8 w9 `; k8 t
set phase 0( v5 W+ e; c* v0 u* c! A3 q
set num-cars-stopped 0
c" b7 f$ |( Q4 J set grid-x-inc world-width / grid-size-x, K& w. F9 p% r' M
set grid-y-inc world-height / grid-size-y5 D& A7 m8 K, C& h: B$ ?6 M0 b
* i3 y$ _: P/ o s, f ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
+ D0 F! t. L. `) Y* i2 n( ` set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
( T8 v% n7 T+ y r5 r3 Q;; and initialize the traffic lights to one setting
) b! X6 h7 L: N+ X6 R7 o, k( zto setup-patches
! v% x. r- f4 j N: j ;; initialize the patch-owned variables and color the patches to a base-color
, o% j/ D5 k) j E0 S. o$ l' i% y ask patches
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) |# z6 R$ y$ a, q' ?: z, _" c set intersection? false
- _/ f1 j0 \5 P0 J set auto? false
+ z0 f0 K8 Y/ g1 v9 [$ \/ N) U, ] set green-light-up? true; m1 F& W6 a6 J8 K: w
set my-row -16 G& _( y! W0 F; _' X" X }; n
set my-column -1
R, U/ f- O }- P" P, V( j set my-phase -1: [: q q1 L7 ]$ }" y
set pcolor brown + 3
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- D9 q/ V- q4 Y' v1 Y" u ;; initialize the global variables that hold patch agentsets# h3 z+ A8 k6 f5 p4 {) s: Z
set roads patches with+ c5 ~; Z8 {3 k1 y9 m7 H9 W
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or/ c/ a! `" c" ~, f$ Z5 |
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
% A: {' A' J9 r' |! g# I6 J5 c set intersections roads with
, y* Z, z' |/ ^9 {5 Q [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
3 H E: ?8 Z3 T# w( |! ] (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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; R$ s# x0 j1 ^1 c& b( w O ask roads [ set pcolor white ]
7 K' A! z1 Q0 n. K setup-intersections
! y1 |8 ^ f3 Pend
) F7 Q4 P( {' T u. \% e& W& ?/ n其中定义道路的句子,如下所示,是什么意思啊?
1 l& w2 M3 L( z8 d' m1 r" n set roads patches with
( S1 H+ S+ w, Q [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or! D& C1 N C' ^! J
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]& }8 w2 n" Z# H1 z
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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