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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。
! a& u- ?4 G1 O: v2 K0 i' Qnetlogo自带的social science--traffic grid这一例子当中,, V/ p h4 i7 ]8 e5 u6 P
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
# b9 o4 x* W1 X% u) t1 m* c grid-y-inc ;; the amount of patches in between two roads in the y direction
' e5 X: D3 y6 E acceleration ;; the constant that controls how much a car speeds up or slows down by if+ ]9 N0 l/ J! H$ k" U
;; it is to accelerate or decelerate
% D3 s: o; Z" b phase ;; keeps track of the phase
5 f4 {* J& D1 W- N3 E, g: y$ U num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
2 o9 M" K! M w4 c current-light ;; the currently selected light
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6 d2 t/ [" m2 n1 ]. A ;; patch agentsets) Y1 V4 h$ v' [* ~( C6 R0 A
intersections ;; agentset containing the patches that are intersections, K& n. X# n" Y1 P) w
roads ;; agentset containing the patches that are roads9 F3 O @! m; w) C V) U7 S/ {
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turtles-own
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speed ;; the speed of the turtle" w) z- b; I3 m
up-car? ;; true if the turtle moves downwards and false if it moves to the right
/ p$ V1 _- i1 @6 f `& ]: P wait-time ;; the amount of time since the last time a turtle has moved& f; n1 N+ D X% m% R( J
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patches-own
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; U) D+ D9 Q( @7 g5 }# L intersection? ;; true if the patch is at the intersection of two roads5 X U5 ^4 Y7 z
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
* E. p( f) z3 m, x; t; z ;; false for a non-intersection patches. H9 \' J' _2 o: _3 p
my-row ;; the row of the intersection counting from the upper left corner of the& J- q. f v i' @/ o2 X
;; world. -1 for non-intersection patches.* m G: [& c7 [& G5 N4 C K
my-column ;; the column of the intersection counting from the upper left corner of the
4 V* ? {* j) ?( S+ U w# E ;; world. -1 for non-intersection patches.
) H0 L0 Y0 k' t. V7 J9 {5 g! p my-phase ;; the phase for the intersection. -1 for non-intersection patches.
0 R" y) g: p$ i d& Q/ { auto? ;; whether or not this intersection will switch automatically.
( p7 v% R. P9 O* K ;; false for non-intersection patches., m: ~! m' O* P$ B. U; \: D1 {
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;;;;;;;;;;;;;;;;;;;;;;! E% Y. p. p( C
;; Setup Procedures ;;
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4 K# u) V& r/ A6 R0 d;; Initialize the display by giving the global and patch variables initial values.: E& \# ?- j1 f0 V# c7 @: |
;; Create num-cars of turtles if there are enough road patches for one turtle to
% G: s' z$ q* S3 U- j5 ^9 f;; be created per road patch. Set up the plots.
' a: Q! z" S1 u) N7 T6 jto setup$ ~8 ]+ i: a! j: A$ {8 b
ca
' |6 w" c1 c: @& N& E' D setup-globals
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) _7 J* p& c( f8 j4 U: E5 R: f g ;; First we ask the patches to draw themselves and set up a few variables- u* |. u4 e* X6 l+ U
setup-patches7 |+ x- Q, J8 C
make-current one-of intersections/ Y2 B1 s3 R& B2 B9 U2 T
label-current
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set-default-shape turtles "car"
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if (num-cars > count roads), s! V& [3 Q6 i2 U
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user-message (word "There are too many cars for the amount of "9 |* H8 u0 X4 Z5 j# b7 b
"road. Either increase the amount of roads "
4 `2 c0 W/ G" A' z Y "by increasing the GRID-SIZE-X or "
1 F7 n1 s" u' x; U% e% R) ]6 I4 b "GRID-SIZE-Y sliders, or decrease the "! `5 M% V6 {7 S. D. Z; e
"number of cars by lowering the NUMBER slider.\n"
: {( u7 v( J8 z3 Y. Q2 V "The setup has stopped.")
+ s2 _1 W8 ?: `, e stop# i, z* F5 h0 d6 c2 z
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
4 d( R; B! i W. {5 k crt num-cars
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setup-cars
" @0 o, m4 `1 R& w. z set-car-color
4 E' c, v- R) ~6 W+ O/ [! p record-data
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; V, O; b) I4 L) H7 w, T" u ;; give the turtles an initial speed q9 {$ }) t# f
ask turtles [ set-car-speed ]& z! d* @$ a, B7 d* b% X
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reset-ticks' d; u3 Q# Z3 ~ o7 Z. a3 v6 v- I
end' Z1 `7 J; p3 H& f' _) Z
8 d6 i6 t/ \! E& D9 T2 J, E;; Initialize the global variables to appropriate values
( n0 g' V/ L% f. @; n# G+ Fto setup-globals
* s- ?( M- ~" X( Q0 A set current-light nobody ;; just for now, since there are no lights yet
) D5 G D7 w0 J: q set phase 06 u. F: v2 k' a% ?0 M, }
set num-cars-stopped 0. [$ \4 h) i# i+ h# N8 m
set grid-x-inc world-width / grid-size-x
( Q: t) u* G& U# Z/ c9 G set grid-y-inc world-height / grid-size-y: x5 U) |6 M( k- M) q5 f- S* p
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary. E2 k/ p' B+ k+ p3 ~, P/ V3 v
set acceleration 0.099& t: S" ~/ c" B7 K
end- D4 U b; I8 n- @/ p
4 N+ t/ [7 g- c1 @4 N3 |+ q;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
" @; W8 Y/ `* p, ?;; and initialize the traffic lights to one setting: e5 k" A1 q: P a( T8 {/ _
to setup-patches Z' o; x: X) U+ J {
;; initialize the patch-owned variables and color the patches to a base-color
- T9 K9 W/ E- P4 | ask patches
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, T( v. e: s8 U9 {% E' F5 h9 E: y set intersection? false/ W' Z# ]! H' v6 ~' v' d9 o
set auto? false: L( g1 q9 W1 i/ P. ~2 O
set green-light-up? true
1 @) u! q( L& p) z) e* U9 g; } set my-row -1! ?* l- P: N s2 |( l% N/ b+ F$ V# g
set my-column -1+ a6 ]+ R; U4 a2 x& s {
set my-phase -1
4 [, g8 F/ i3 d& V1 N set pcolor brown + 3
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* ]2 f. i+ P. t+ x- I ;; initialize the global variables that hold patch agentsets
9 B" C" U% V" |% V" z% j8 m9 j set roads patches with
$ ^9 y- h8 _$ B1 ` [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
' u, g P% R, R9 o6 u- H' l) } (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
7 q) W6 w3 p+ u- V* E: o set intersections roads with
I, |: Z3 v: L# H% Z7 B [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
) i# k5 _. r( s0 w- X (floor((pycor + max-pycor) mod grid-y-inc) = 0)]! c+ C% G4 u& H! ~1 L* J$ g
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ask roads [ set pcolor white ]
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end
\, i9 u: x [; b) n5 Y/ O( o- }其中定义道路的句子,如下所示,是什么意思啊?. K/ m2 [3 [& O
set roads patches with4 r% l* J- n. ?3 b- F
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
9 \5 ?4 ]/ O. ] (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
6 O* \* G- ^8 Q: M0 t$ U3 m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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