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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 K( a, _3 G3 Y" N
netlogo自带的social science--traffic grid这一例子当中,. V! R3 H9 `2 R) `
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction$ h' ~! h6 k5 d% E. v
grid-y-inc ;; the amount of patches in between two roads in the y direction _) E7 U' D0 C' F" q
acceleration ;; the constant that controls how much a car speeds up or slows down by if* X' O- h. ^( n" Z& q+ _# |7 z
;; it is to accelerate or decelerate# E3 o$ i) q) q$ { m
phase ;; keeps track of the phase4 @& o4 J% ~& M9 [
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
8 ]% l4 }6 t- x" K" ^% ` current-light ;; the currently selected light
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' a; R6 Y% g4 I! ^7 J3 k: p ;; patch agentsets
% H( N/ l$ _' H& t! h intersections ;; agentset containing the patches that are intersections; w q6 s* F% E3 M% o' B
roads ;; agentset containing the patches that are roads6 c' ^0 s( X) f% u
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6 n+ V& i( [) Wturtles-own
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`8 J* f) M% U4 o speed ;; the speed of the turtle
( {( R9 ~- {- j% M* h- H up-car? ;; true if the turtle moves downwards and false if it moves to the right
3 {# _( |- x/ D* c- X6 L5 t4 ` wait-time ;; the amount of time since the last time a turtle has moved3 X' C9 a& Q- {+ s& ]( L3 \
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. U5 w9 t. | I1 s4 b2 A9 _0 x" spatches-own
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intersection? ;; true if the patch is at the intersection of two roads
; I- A6 L( |) c( a" P green-light-up? ;; true if the green light is above the intersection. otherwise, false.
: d& T, T' x. D& w' G! T) Z7 d ;; false for a non-intersection patches.
1 o6 @! x8 U# _( E8 x my-row ;; the row of the intersection counting from the upper left corner of the
! F5 q% x. z* S' ? ;; world. -1 for non-intersection patches.
, O5 G$ V/ g/ d# O8 c6 j my-column ;; the column of the intersection counting from the upper left corner of the
9 d; U1 h" z. G. F: J ;; world. -1 for non-intersection patches.0 X M/ @+ v R( o1 C4 n
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
7 b' _* f* ^, S- P+ ^1 s7 O7 z# G auto? ;; whether or not this intersection will switch automatically.
- {2 d* y9 d3 p d# V ;; false for non-intersection patches.7 m# k( e( D1 [4 w% p
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;;;;;;;;;;;;;;;;;;;;;;
: W" V2 O' W' _) a' m- |9 I;; Setup Procedures ;;6 R3 A2 {/ m9 A* ]5 i
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;; Initialize the display by giving the global and patch variables initial values.
9 n. S& s( @3 N;; Create num-cars of turtles if there are enough road patches for one turtle to
: u, ]5 m3 ` J;; be created per road patch. Set up the plots.
& c2 t, W/ D% o7 |2 ^; Cto setup
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2 Z' e5 |: U) k3 I+ w7 N, j3 c' o+ w setup-globals
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;; First we ask the patches to draw themselves and set up a few variables- l3 L% n( ?/ z* k5 ]5 C
setup-patches, a' x; f# o' K# r0 t3 W
make-current one-of intersections
" R* }6 o" s: A6 V& V; u8 A label-current9 t4 |, d0 Y7 F: p1 `: d
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set-default-shape turtles "car"& _( B- t; }1 j& h$ ~
' x9 i* L' Z1 x5 [4 z if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of " N6 y) g& N0 d9 a. g! \5 S
"road. Either increase the amount of roads "
; _+ {0 \- w/ j5 b "by increasing the GRID-SIZE-X or "
; V; x7 a/ {% k/ R$ Q8 \ "GRID-SIZE-Y sliders, or decrease the " d& x- I8 t! O9 H/ {8 ]
"number of cars by lowering the NUMBER slider.\n"# u' l" B3 R6 w9 N. K
"The setup has stopped.")
" v9 f0 |6 y1 O1 t$ I stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
0 b1 s2 T, R1 I7 n* j0 _# e# z crt num-cars
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setup-cars
5 Y2 d, e. E( B) ^( O set-car-color9 ~$ n- c) P( l+ {& n" P$ {6 u! u
record-data% w$ X& v3 D4 k
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;; give the turtles an initial speed
& W- v& D& l: Q1 |' C2 X ask turtles [ set-car-speed ]
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reset-ticks
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;; Initialize the global variables to appropriate values* k/ j* _9 D/ J, f9 }: f( \
to setup-globals4 |7 z, p% A4 `
set current-light nobody ;; just for now, since there are no lights yet
% u: o, U' y( r9 m6 k! N: C9 ]+ i, j set phase 0
7 R$ u9 e: q" l) H2 Q set num-cars-stopped 0
' b+ k1 _$ F& `; n2 Z8 i) H) g set grid-x-inc world-width / grid-size-x
. y4 ? g; i/ X; N set grid-y-inc world-height / grid-size-y4 S/ x* c" j, Q& ~4 R; k# T
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
2 ]/ t3 b, z( ` X/ L set acceleration 0.0993 ?' a) B# D. \1 c |# r: O5 ^
end% H5 P; C3 w1 k' I
& d _# p+ O& k;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
' \8 m( v& X" a5 K" W2 H;; and initialize the traffic lights to one setting5 J: A1 i( y: h; g6 \& }
to setup-patches
- j2 @$ W+ ]/ K0 P ;; initialize the patch-owned variables and color the patches to a base-color+ R S- z# ]7 K
ask patches1 |0 U: Q* u% C% p1 a
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set intersection? false# ~/ T$ T% ]$ g7 U2 o: k
set auto? false
f Z5 X6 L9 Y1 \ set green-light-up? true
# P, S. W1 o0 M7 t/ y, h set my-row -1( R; Y! w: q; h+ m) W: q. p, B: B
set my-column -17 [" L8 T9 t0 L: |* k
set my-phase -1 D, `5 K) t+ l6 Z7 w6 O
set pcolor brown + 38 ]: \# r- R9 x9 h; g
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" @, q: G1 M2 e ;; initialize the global variables that hold patch agentsets
+ x% `% g7 m& y: X8 [ x6 {. D set roads patches with" }3 V% d& s8 ?# z
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or, }, X6 N" l- y
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
. z. Q+ j( O# v# p6 m1 N; ^- M2 q; [ set intersections roads with
* } @9 b4 b4 x7 E; r; X [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
0 K& U4 o) \ l; @% e (floor((pycor + max-pycor) mod grid-y-inc) = 0)]" w8 s2 b* A6 A( g5 V& K- N6 a
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ask roads [ set pcolor white ]
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end
0 U% s- M0 U. p其中定义道路的句子,如下所示,是什么意思啊?) \: H7 V" u5 Z. N
set roads patches with6 O7 `+ Z: B6 t6 J; v
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or3 w) E/ G+ z6 s7 c% F3 M. b
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 r; a- M* e2 p1 v9 j" W; T: [9 u0 E
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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