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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。
% c& S- w8 A2 k7 d- ?0 U4 e5 \* u+ Rnetlogo自带的social science--traffic grid这一例子当中,
% F+ Q6 }1 G' c2 t! ]6 Vglobals# B! l2 ~1 ?4 C9 i
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grid-x-inc ;; the amount of patches in between two roads in the x direction4 _! ~6 ]% r/ _$ |1 E" d
grid-y-inc ;; the amount of patches in between two roads in the y direction2 `; f2 R9 j% H" @9 m% t
acceleration ;; the constant that controls how much a car speeds up or slows down by if8 U/ D8 m. z4 U% X! {/ _' {
;; it is to accelerate or decelerate; J+ C1 Z/ O. ^/ @. N7 ~( ]
phase ;; keeps track of the phase
* k9 g& C# @ D num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure4 {' L, f- p$ z6 P' k5 q
current-light ;; the currently selected light
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& ~/ a! E2 s7 q; s# i ;; patch agentsets
9 X% M& p5 _& r" _; u1 X' }) e intersections ;; agentset containing the patches that are intersections: n5 Z: B+ W% `
roads ;; agentset containing the patches that are roads, {1 | F/ Y% L5 K# e% ]
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( P* b0 F$ a) I2 |5 F* ]' n+ nturtles-own9 e3 A x/ C% Z* A1 k0 b6 W
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speed ;; the speed of the turtle
7 ~( D( K- P: v up-car? ;; true if the turtle moves downwards and false if it moves to the right$ j3 q6 h! U E& F, b# _6 e7 Z
wait-time ;; the amount of time since the last time a turtle has moved" [& G5 |) I" v3 {! s- M$ v
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patches-own3 s$ i3 Q7 I2 L# }1 v" l) Q7 v
[- O1 \4 ]4 p; n6 \+ z7 \# p9 ]6 T
intersection? ;; true if the patch is at the intersection of two roads
; M. [8 S- c6 u: e2 H green-light-up? ;; true if the green light is above the intersection. otherwise, false.- R3 S) \! |5 a. D$ Z3 ~& T
;; false for a non-intersection patches.
5 x5 E5 w4 g# J: F. R my-row ;; the row of the intersection counting from the upper left corner of the) F ^* l3 J- k2 W
;; world. -1 for non-intersection patches.
/ p6 ?' O6 z p1 }, Z! T, {! T my-column ;; the column of the intersection counting from the upper left corner of the+ D/ w, O7 L2 q+ K% e1 c3 z
;; world. -1 for non-intersection patches.
4 U6 g R7 D7 l" N1 Q8 ` my-phase ;; the phase for the intersection. -1 for non-intersection patches.
, _5 A# F) n, e( G$ t. X& O/ O auto? ;; whether or not this intersection will switch automatically.
3 L( i6 f! E5 y( t0 \7 n4 s4 Y ;; false for non-intersection patches.- {6 d# [ L/ V2 [" l C
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;;;;;;;;;;;;;;;;;;;;;;8 B; n' F- t/ X. T; ]
;; Setup Procedures ;;
3 D2 U2 J( ~5 ]8 t- k3 C5 b/ ?;;;;;;;;;;;;;;;;;;;;;;
2 U {0 t8 Y* b0 y
3 H) o! y, ^! F8 [" `% B9 c;; Initialize the display by giving the global and patch variables initial values.
$ a: F" R) z7 S- X( |7 D;; Create num-cars of turtles if there are enough road patches for one turtle to
5 U& |$ n( g" Z& b- s( f& B;; be created per road patch. Set up the plots.
8 ]. c, n4 {, S0 s4 c; ito setup
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1 A. W% Y0 i/ O9 m& h+ F setup-globals
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;; First we ask the patches to draw themselves and set up a few variables
2 \) X: L/ M- ~- ~# e. e setup-patches# ~( p6 v Z. R
make-current one-of intersections2 d1 o2 U6 w+ b8 M' [1 J
label-current' z" ^$ U* |& {$ a
+ Y8 T% i0 R8 |* q, | set-default-shape turtles "car"
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4 F' _$ @7 ^% s! |9 s5 p if (num-cars > count roads)/ p' `& j1 O) w. d' p. ~; l
[
( t) J* w8 F1 i+ y, p user-message (word "There are too many cars for the amount of "4 k& O! n& U( {$ X1 @' Y. f
"road. Either increase the amount of roads "8 K# U. u& z2 R) r8 @( n
"by increasing the GRID-SIZE-X or "
7 j! U$ g! c: `/ L$ m& ?! I "GRID-SIZE-Y sliders, or decrease the "' F q$ V- \' h8 @8 d; | {2 {- C; B5 }
"number of cars by lowering the NUMBER slider.\n"1 O5 t: u( i y& M! e+ L+ e
"The setup has stopped.")
# A3 @8 o/ j2 ]& A* j stop
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; ~8 p: |# A \9 y
e# P6 e% ^9 b% O ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color/ _3 x* j+ K2 U' v) J |; t7 P
crt num-cars
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setup-cars! o1 ~- X) }( N& b! B! k$ q/ ~
set-car-color2 [3 }0 U$ I4 ?6 y" r
record-data9 U4 J, A0 k4 g
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0 B% D9 z/ y6 Y4 q3 x ;; give the turtles an initial speed( q0 p$ t9 M E* h$ o
ask turtles [ set-car-speed ]
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2 H3 t+ P7 G# v8 E5 ]/ Q! n4 ^ reset-ticks
( s5 Z# L: d' Z5 V# }( zend
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6 E( `9 {' ?) ?* i2 O;; Initialize the global variables to appropriate values
. u, W2 A+ [2 X$ G# \to setup-globals$ u7 m( @# h- h+ G
set current-light nobody ;; just for now, since there are no lights yet
' J+ O- G3 C0 P' }3 F0 z- A6 A set phase 0! \. e2 s+ d$ D5 U9 H
set num-cars-stopped 0* ~9 T6 G( [; X5 v2 K( f$ v$ G
set grid-x-inc world-width / grid-size-x
Q- H$ X) e ~ set grid-y-inc world-height / grid-size-y% {" p# }0 h0 v4 T) K4 `7 y% E, b! O
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
" m' d) u+ M2 h$ @7 y5 ` set acceleration 0.0998 n+ M4 D9 Z w
end8 G: ]/ \8 u8 [% Z5 w. E' J N" O
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,- c. ~3 x9 R- w
;; and initialize the traffic lights to one setting" i% g/ u. R+ A; k2 ?' N) {
to setup-patches0 X ~+ e& L+ H5 l& Q" D/ V
;; initialize the patch-owned variables and color the patches to a base-color
& M& j6 m# M1 C# S2 c5 B4 j; H ask patches' E6 [0 a; X1 H6 w
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set intersection? false) Q# J2 [# x+ R+ l4 \
set auto? false
0 u4 m, D* m5 n set green-light-up? true
: H4 e$ g, O" ^4 m set my-row -1% O ? a6 y# {) ]7 ?
set my-column -1
; w4 ^, k) A! O* `3 _0 W4 k& h set my-phase -13 {9 q ^8 m K6 c. ?" D
set pcolor brown + 3
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: K5 {! U* d) [ r) v, ` r ;; initialize the global variables that hold patch agentsets4 g) w% W, J# f. e
set roads patches with9 X7 X1 n9 A2 j; R( P5 c& d2 y& V
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
% ^ Y& b5 p6 w' S! Q4 O- T (floor((pycor + max-pycor) mod grid-y-inc) = 0)]: } Q" Z0 I/ L8 B5 M. y2 s/ E# r6 I
set intersections roads with3 }; F' k) I# H. n! s
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and$ G. a! R# F0 c* z9 r; S
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
6 E! \/ D3 \7 \ setup-intersections' ?) F9 b( }3 J' ]
end
! j8 J8 p# M9 `3 [其中定义道路的句子,如下所示,是什么意思啊?
8 l; d, s2 v& x' l7 R! [" Z set roads patches with. Y1 {( g c l8 \" |5 U) D
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or- A* R! w9 z9 A0 A5 T- B1 f
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
+ V. o: B2 \% p1 Q5 [+ S$ c+ n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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