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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。: v8 e, a% x& Z& ~
netlogo自带的social science--traffic grid这一例子当中,* }, X, i( l; x: U# z7 k$ {
globals' c. J' V% s9 j4 _( X
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8 D8 p( B' n8 C; P/ [7 n grid-x-inc ;; the amount of patches in between two roads in the x direction
1 |0 N2 C- m k" i1 u grid-y-inc ;; the amount of patches in between two roads in the y direction/ B9 E* t! r$ B6 `
acceleration ;; the constant that controls how much a car speeds up or slows down by if
% q. J9 [/ l* I) i6 ] ;; it is to accelerate or decelerate8 ^: J0 z: j, }; Z. U' Z
phase ;; keeps track of the phase
4 \% K: i* C% R# p1 J( a/ d num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
) t& G+ @& g9 {' n: x+ t# b0 F, \ current-light ;; the currently selected light
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' g; r6 i. Q' f1 G) n ;; patch agentsets
4 a3 X Z- ?( B+ ^, |5 x* a; J intersections ;; agentset containing the patches that are intersections
' o4 a2 Q( }+ `$ d6 i% R9 ? roads ;; agentset containing the patches that are roads5 } W( B1 `1 C) [/ o! e
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turtles-own$ R! C3 C% m# y3 N, r) u* a
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speed ;; the speed of the turtle. Y6 Y# n( [& ~, i+ k
up-car? ;; true if the turtle moves downwards and false if it moves to the right% q& \' J# [% h
wait-time ;; the amount of time since the last time a turtle has moved
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. y& v: a \) W3 D. ?patches-own
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intersection? ;; true if the patch is at the intersection of two roads, a, ?& b4 L) E$ ^8 g8 A' O! r
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
2 g" \" }' s! K ;; false for a non-intersection patches.! w* i' ^+ Z R7 k5 E7 V0 e0 g
my-row ;; the row of the intersection counting from the upper left corner of the
6 n& J! r( M3 i: W# Z& K- ^- b z ;; world. -1 for non-intersection patches.
$ R$ P. M9 b# e# v. m my-column ;; the column of the intersection counting from the upper left corner of the
Z) ~1 ]( |/ F4 U$ E. R" `* Q1 Y ;; world. -1 for non-intersection patches.% s7 q0 P, ?% i" n
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
& Z. L8 }7 g" d, ] auto? ;; whether or not this intersection will switch automatically.- ]# n) D3 v' }: {* A
;; false for non-intersection patches.: r' H9 M4 m. Z) n; L5 A# S
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;;;;;;;;;;;;;;;;;;;;;;/ ]% v' t L- ^" Q5 [+ S( u5 f- R
;; Setup Procedures ;;
- n' ~2 C) m5 t, f% ^* _0 Z) o;;;;;;;;;;;;;;;;;;;;;;( U( S- ~8 i2 F
8 s2 @& i/ z- U5 D;; Initialize the display by giving the global and patch variables initial values.9 k" k" K; c& H- @$ t
;; Create num-cars of turtles if there are enough road patches for one turtle to" |: Z" Z( {6 x1 |0 \) m
;; be created per road patch. Set up the plots.7 a1 F; n" x4 M- W2 b9 B+ Q
to setup8 |7 h* t& {. L2 a% k, ^6 y
ca2 B) L C5 x! ^2 }1 M; ~/ K
setup-globals4 w; Q6 G- J; I j9 ?( k$ A
# c6 ~% F. S4 A- u- | ;; First we ask the patches to draw themselves and set up a few variables
1 x. u& q/ x$ s setup-patches
+ q2 {2 L6 d5 U9 L9 U6 Z) D make-current one-of intersections
. K- L Y2 b7 O9 B7 k4 X label-current0 ?& j4 s9 U7 X, r# ]- V( ?
8 g' `6 R- ?& ] R set-default-shape turtles "car"- ^# I* [: R9 ?8 e* R0 G
* r2 Q: C7 B6 B if (num-cars > count roads)$ j3 X2 b5 F8 x8 o6 q( W
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user-message (word "There are too many cars for the amount of "
) a' @4 g! N+ Y# Y6 T: O \ "road. Either increase the amount of roads ", _% F# j3 z/ L
"by increasing the GRID-SIZE-X or "% ?: p# V! {8 ]8 h. K. Z2 P8 k3 R) S
"GRID-SIZE-Y sliders, or decrease the "
# W$ g3 g+ h/ ~! p3 U9 H+ V; k "number of cars by lowering the NUMBER slider.\n"0 }, X) m7 ]! L0 c {
"The setup has stopped.")0 F$ y$ E# i! S4 l/ X- P$ F
stop
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" N A5 J' I* x# C ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color' {2 `# k/ N; N. b: ?# [% y
crt num-cars
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) s% ?: t5 W6 }- j setup-cars
! l5 ^6 D: E3 n. r$ e set-car-color
7 M, O# L2 D% h" X$ r record-data9 k/ b7 o0 R1 Z/ h- k/ E
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( n/ |# q& h* B& V ;; give the turtles an initial speed- z- A) W" Z* v
ask turtles [ set-car-speed ]( H9 p- [+ n5 L( h0 r9 [7 d. d
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reset-ticks# N8 O3 r2 e k% e! e" o, e7 @& A
end8 R! i2 @/ \1 i. T) o0 f
1 p8 t4 K& o$ z, ~, t;; Initialize the global variables to appropriate values: M9 Y9 Q, Q0 j4 ?0 {2 K8 Y; O
to setup-globals' y+ s0 d6 }8 e R! t
set current-light nobody ;; just for now, since there are no lights yet7 p7 ]& D% O. K3 c* Q
set phase 0
3 G8 Z1 c% C* x9 L' @ set num-cars-stopped 0
9 a N- y, e3 O z- | set grid-x-inc world-width / grid-size-x& T% a' {$ k/ A1 u
set grid-y-inc world-height / grid-size-y
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
5 v4 I9 s# O6 H7 V n5 c' h. v set acceleration 0.099$ o8 t* W1 V- U/ E* N
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
: O# U* j2 u% }0 n' J;; and initialize the traffic lights to one setting
# z6 Q" W; S! ^4 e: {to setup-patches, Q9 q% @( \4 o% E- z
;; initialize the patch-owned variables and color the patches to a base-color
4 u2 x% S- ` s+ I/ l, H ask patches
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7 R1 Z6 u" b/ Y& s, s8 W0 s/ d set intersection? false
7 b3 V: i. H: z$ e' r9 c1 E5 ~ set auto? false
$ q, B6 ?8 u3 _, P6 M. `- x, p0 m set green-light-up? true
& ]- ^' b9 S- y$ r set my-row -1
) d/ @1 N/ U9 E4 M6 q: E set my-column -1
2 N3 V4 l% {4 V1 e- T7 Q set my-phase -1; V! |4 J, G! W( {, L" C$ `6 o, t/ V
set pcolor brown + 37 ^8 `1 t" v# q( X- w7 u2 ~) T
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;; initialize the global variables that hold patch agentsets: O* W. k! q9 M& L; d
set roads patches with
: s- q( O/ v6 v$ Q, h. t1 d [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or1 j- m% g; \! B
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]) E- K) @1 Y ^! u
set intersections roads with
& l0 {+ {1 @ Z+ L; f [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
* o9 e5 Q2 w. F5 f (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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5 _0 W7 t: l/ t9 T; w6 x2 r ask roads [ set pcolor white ] b' ~) i, P" G2 c& n% p5 K
setup-intersections# a, G) [0 Z8 F E
end+ r0 t$ ]2 B% ~9 [) F1 x
其中定义道路的句子,如下所示,是什么意思啊?' T* U E5 S6 ?
set roads patches with
/ T. y6 K+ N S$ g& [4 g4 ] [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
, S' f1 b8 M' O+ _$ e% c (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
0 S) C0 X7 z0 D. P% B0 U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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