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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。
4 m: V7 C! A( R! g- qnetlogo自带的social science--traffic grid这一例子当中,
$ Z$ Z1 ?4 E! v4 lglobals) u) f& H; b$ W6 r8 a% ~
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grid-x-inc ;; the amount of patches in between two roads in the x direction" w9 h+ b3 N z1 X
grid-y-inc ;; the amount of patches in between two roads in the y direction
# M6 j8 G. J4 T% c F% Z1 t% R/ K1 F& I acceleration ;; the constant that controls how much a car speeds up or slows down by if9 w P" M) _" ]& q' Y
;; it is to accelerate or decelerate
G$ n5 z/ k. e' E5 G" j+ S/ ? phase ;; keeps track of the phase
# S4 ]$ Z; \7 A0 w* Y8 [ num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
3 \3 B2 o; Z6 {. G current-light ;; the currently selected light- p9 _1 a3 |, ~# z7 n$ N( H c
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;; patch agentsets. L8 I. A3 q/ O5 x6 \: s Q9 l- @' a# h
intersections ;; agentset containing the patches that are intersections
5 P) l) S$ M* ^- @- W roads ;; agentset containing the patches that are roads
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* e5 @5 T0 M6 f) Z3 Rturtles-own/ \2 g: N0 ^- S1 J1 v% t9 g
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0 Y4 G- Q. p; I0 a speed ;; the speed of the turtle
- p/ _* M) }) S% P+ p up-car? ;; true if the turtle moves downwards and false if it moves to the right0 I# r5 g# u v0 V j
wait-time ;; the amount of time since the last time a turtle has moved2 k' s' N5 @8 P/ b0 m2 z
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2 e! f1 c2 P. C5 dpatches-own+ C) @/ v* Q8 W, Q3 M
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. B3 p2 S. b# n F) [: ~ intersection? ;; true if the patch is at the intersection of two roads
7 a3 }' [1 y7 O green-light-up? ;; true if the green light is above the intersection. otherwise, false.
% U C( Y$ m' C ;; false for a non-intersection patches.7 E8 }. f9 m6 B: P2 b
my-row ;; the row of the intersection counting from the upper left corner of the
* e" j3 F; Z5 P1 I: a$ T$ K ;; world. -1 for non-intersection patches.4 t5 s$ q# H2 ~/ }. y" E
my-column ;; the column of the intersection counting from the upper left corner of the
. L( p+ k% i4 W9 d3 h: } ;; world. -1 for non-intersection patches.% [, z7 F- Z; V
my-phase ;; the phase for the intersection. -1 for non-intersection patches.! A3 f. ~ X/ v1 ^4 D0 q
auto? ;; whether or not this intersection will switch automatically.
% T& h9 L" J' p: m7 h ;; false for non-intersection patches.1 f! V+ A9 l, K+ U
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- _: @. }& V% _4 ]* };;;;;;;;;;;;;;;;;;;;;; D& L9 U7 X: ?$ G, j$ \
;; Setup Procedures ;;
3 y4 W' _5 c, X;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.% o; `9 S2 `2 e2 E
;; Create num-cars of turtles if there are enough road patches for one turtle to
9 m1 ~5 P! H w. D' ~& c0 q% N;; be created per road patch. Set up the plots.
4 ~5 d7 V: q% w& @; |2 Tto setup
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" ]0 J$ z9 |1 |' F* b setup-globals6 ^0 g/ `5 x: E" \( x# V! V( \3 ^
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;; First we ask the patches to draw themselves and set up a few variables
4 M: o# \1 N- R/ H' h setup-patches
' T, n# Q: N( d" G. ~ make-current one-of intersections) A6 Q7 V0 O8 j
label-current
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/ g) D! o. ?' c7 B set-default-shape turtles "car"# S& i) ], }+ Y- R7 k- z4 F- c
& @0 F& K: ?" g2 x3 ~6 N if (num-cars > count roads)
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. s/ G' w. J* N user-message (word "There are too many cars for the amount of "3 N/ F$ R5 R1 O+ l3 |# l! Z
"road. Either increase the amount of roads "
/ J8 i, q/ N5 `% J- v3 W4 N0 {" o1 d "by increasing the GRID-SIZE-X or "
' T* Z/ I, d% m: x) H; a "GRID-SIZE-Y sliders, or decrease the "
1 i* C T' B' L$ r+ U "number of cars by lowering the NUMBER slider.\n"0 t8 O+ }! f( q
"The setup has stopped.")
9 e5 c# J6 K: j stop' V2 N; x4 {5 K n6 N- H1 R
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! Z8 r$ [# g7 l3 b. H7 G. O/ | ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color/ p/ K. _- u j& l+ L. z# h
crt num-cars
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! J4 s( W% S5 ]/ b setup-cars
4 U3 x5 I& V; D8 t0 m+ G set-car-color
$ b6 k; _! R* ^. v& M) R* T record-data/ Z/ u7 H0 |% j# L5 T, D( X
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' I5 n7 u- F; U/ g" u" m* I ;; give the turtles an initial speed% T. }1 Y k( L: v2 }* x! n* Z
ask turtles [ set-car-speed ]7 \5 P) W5 h' Q: o. u6 P. e
, C& a& G: ?' L3 L! }2 C- o reset-ticks* m J( u# E! {( z% |3 R6 ]9 d
end( s3 |" y* K) F8 P( ]
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;; Initialize the global variables to appropriate values
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set current-light nobody ;; just for now, since there are no lights yet
( D) w' N5 P; S* d2 Z& G$ [3 Z set phase 0
* G% f. c7 M3 B. d set num-cars-stopped 0
* D8 E% o* S/ `% P4 n& z set grid-x-inc world-width / grid-size-x
/ p( [6 F/ ~% t$ |* q0 s set grid-y-inc world-height / grid-size-y2 ?7 ^% y. Q; D" v+ ~' T
& ?7 b3 }" j" e ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary( |2 E. x" o3 N' x" N
set acceleration 0.099
" X" ]8 U! m+ p7 q# M, d# \) gend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
9 v' H+ G! ?) k) z+ P& x;; and initialize the traffic lights to one setting% c8 e$ s8 \) X6 v* m
to setup-patches
2 v/ D* y- R) B& n8 P' p, J5 { ;; initialize the patch-owned variables and color the patches to a base-color
# y H$ A% H/ b2 K ask patches: \( f6 B3 C& m5 X o% Q/ u b
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set intersection? false
' Y6 p7 J: s, N) S2 y& ~; P6 G set auto? false
5 z. H2 `& H# M P. j set green-light-up? true/ R( Z( r$ u- Y
set my-row -1
5 r; U2 ~# H7 g& P" { set my-column -15 a9 G) ]; t' _. x( W$ b, `, p
set my-phase -13 }( T, L, P' D! V, L+ D h' D! c
set pcolor brown + 34 x% c; w- {" g! s z0 R9 n; W
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1 @5 P; w! e, E" p# S& i3 d ;; initialize the global variables that hold patch agentsets
' F) ^7 q. p$ r, B$ j( b set roads patches with
$ e+ s% w1 b. G$ L [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
~$ z% B) |) U2 N5 Q (floor((pycor + max-pycor) mod grid-y-inc) = 0)]; O+ \+ Y" b: y/ S" h4 I
set intersections roads with( T6 {) V7 S* t1 j4 s* L1 \
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and% C% Y: s" c. V/ k( z
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]: g% {$ Y9 A4 z
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ask roads [ set pcolor white ]
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/ G$ c7 w- C$ r1 Z" z* j2 U; v0 Lend
4 B9 G+ v5 d9 S5 C& g8 e其中定义道路的句子,如下所示,是什么意思啊?
" ^6 T/ p1 B* U, S5 T6 q0 J# c8 ?8 z set roads patches with
7 b& L, B1 a ~& f0 T& ]; d [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
}6 W- N1 V9 O+ M. \ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]4 c. l0 k7 d, f& u, T$ M: C
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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