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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 E- k: S& E+ e
netlogo自带的social science--traffic grid这一例子当中,
3 D0 H3 d' U7 Pglobals
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' J" B' B" c% r2 m* t/ I2 h1 d& O grid-x-inc ;; the amount of patches in between two roads in the x direction+ }, }7 v& u/ B! p s* g; T
grid-y-inc ;; the amount of patches in between two roads in the y direction7 s( T) m( S7 f7 ?1 V
acceleration ;; the constant that controls how much a car speeds up or slows down by if
, g6 h$ b7 @' Z' o. u ;; it is to accelerate or decelerate
- |( S# l( ]3 z! L# A phase ;; keeps track of the phase! P+ r3 p4 @* |: q! ^" m0 E
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure; b6 G' w& v* |* \/ ^
current-light ;; the currently selected light& `) e* h+ v" ]1 W0 b; P# Q
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;; patch agentsets
$ I/ a' f8 ?# @( v intersections ;; agentset containing the patches that are intersections
$ J9 `& X& U7 z& j! U roads ;; agentset containing the patches that are roads
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turtles-own- E% @3 x3 ~. a6 _
[
! N' F. o; u" K L- b speed ;; the speed of the turtle
9 y: L7 W; O0 w; z5 n1 a up-car? ;; true if the turtle moves downwards and false if it moves to the right& Q9 J* ^& s/ T9 J* e ~
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own, L+ {+ Y( X3 _$ Z
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intersection? ;; true if the patch is at the intersection of two roads
$ ~* Q* `8 d$ d$ n green-light-up? ;; true if the green light is above the intersection. otherwise, false." [& e8 f3 ]* ?# o6 _
;; false for a non-intersection patches.
) Y) h" d+ D7 N- n- z my-row ;; the row of the intersection counting from the upper left corner of the+ F; U2 h5 p0 V* F% d
;; world. -1 for non-intersection patches.1 t% D2 q( Z# y$ c n
my-column ;; the column of the intersection counting from the upper left corner of the
7 E8 i- M" ~) k/ h ;; world. -1 for non-intersection patches.
( B6 a2 d/ ]. g my-phase ;; the phase for the intersection. -1 for non-intersection patches.8 n" `: f6 }1 b- Y
auto? ;; whether or not this intersection will switch automatically.
+ E0 m L* V. U5 @) h3 i H A, D ;; false for non-intersection patches.- E0 L3 \9 t' ~4 @
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- q& O4 C$ @" i' y! G( m;;;;;;;;;;;;;;;;;;;;;;
' }+ q/ u+ A9 u; b6 u;; Setup Procedures ;;( Q: Y2 ]) @$ {: l
;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.9 ^9 g( _% ~% O" N# g4 T$ m
;; Create num-cars of turtles if there are enough road patches for one turtle to
7 M u8 N# b7 n f- ];; be created per road patch. Set up the plots.
0 ~- F/ ]" B; `3 i cto setup
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3 w: g/ t4 i/ E setup-globals
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;; First we ask the patches to draw themselves and set up a few variables% ~! u% X; ]1 [( n+ Q
setup-patches* A& j7 l ~: Q O* L1 K4 ~
make-current one-of intersections
, Z1 T3 U( ]$ J! b label-current/ ^7 Q7 `7 y& N7 a% V$ b3 P
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set-default-shape turtles "car"
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' ]( k# W& Z* l9 \! T) l$ w if (num-cars > count roads)9 `& K9 S- _3 r7 f+ ^
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user-message (word "There are too many cars for the amount of "
, p2 v! \6 K8 S' { "road. Either increase the amount of roads "* r% U% x0 {; `$ u0 v2 y* ~
"by increasing the GRID-SIZE-X or "
0 Y! ^ W9 ~/ E: L "GRID-SIZE-Y sliders, or decrease the "- R$ ^. Y, A5 j
"number of cars by lowering the NUMBER slider.\n"' x% |0 r7 f0 r0 f- E
"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
# H: n! V }2 _ crt num-cars1 Q/ L6 E* A) N. x
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setup-cars
0 n% I. c4 i E set-car-color7 f: m+ i; q @6 c# f
record-data
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3 v4 V+ f, F% ? ;; give the turtles an initial speed
7 ^3 {: p! {: }8 c0 Z# V X ask turtles [ set-car-speed ]
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5 V0 ~9 `9 S0 t' v" F0 d! f+ S reset-ticks
" m8 E2 H: i- ]0 \* v- G1 bend
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;; Initialize the global variables to appropriate values
; ]4 N- C/ j2 L" Ito setup-globals; i, k0 w+ ?. t; E9 z" _; M
set current-light nobody ;; just for now, since there are no lights yet8 {9 I7 \* p4 ]7 k
set phase 0
! h" _' r" q0 Z1 V: ^! h9 I: h set num-cars-stopped 0% n: Y* W1 o h; h% z% u7 r
set grid-x-inc world-width / grid-size-x
/ C/ V, Y3 [/ s9 c6 \$ R/ a set grid-y-inc world-height / grid-size-y, z! A0 M3 [/ o P! w1 l
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
q* o. H O6 l set acceleration 0.0999 k2 g3 K6 W! Q" \+ k* z
end2 I r& F# g( e1 z/ h
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets, v f" m9 d/ ]- h* `) k4 J- L& S
;; and initialize the traffic lights to one setting
* }2 N4 Q% d% Xto setup-patches
# I* s+ i8 o1 j ;; initialize the patch-owned variables and color the patches to a base-color5 s! |4 W, R; [ s, Z. M- \
ask patches2 O- [, \1 ]8 Z$ ~" q
[
' M4 Q6 q' I7 R! o1 q set intersection? false$ N# i6 A$ U4 x% e b6 O
set auto? false
! v s# r R* `" o set green-light-up? true
( V$ V' F; ~( n* ?; ? set my-row -1
+ R% K- ]0 x2 L3 z* y ]3 q set my-column -1
3 B; \. u6 z7 n% _4 Q3 O2 P set my-phase -1
, j `# s R1 f- E4 l' x& E set pcolor brown + 30 w- t/ E" e2 d
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;; initialize the global variables that hold patch agentsets
7 p9 D% ^" j" v! K set roads patches with
7 `: _! w2 Z( W) m- s [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or/ A/ _8 Y) L% c% R
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]' G. h& F+ ]1 L! m, v
set intersections roads with
/ H5 \6 m0 C. m n! i3 Q [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
4 m# M6 {- [0 E (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
[9 G2 F t. c setup-intersections5 f+ P6 h; U5 c
end
5 c% L Y0 O$ Q" W其中定义道路的句子,如下所示,是什么意思啊?" e% j- ?8 {( d9 [# F- |# E' q
set roads patches with
1 t! X* P- d* ^) Z [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
+ i* G# t/ _) g! A0 T (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
; w# [6 W0 p& X& X# k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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