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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 R. d6 l. b) v0 L! k$ [5 vnetlogo自带的social science--traffic grid这一例子当中,* _1 i" }! u$ y7 w
globals8 K0 s+ _: a0 I6 D( h
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grid-x-inc ;; the amount of patches in between two roads in the x direction2 Z, G6 S4 h. \9 { D; ~& T
grid-y-inc ;; the amount of patches in between two roads in the y direction& w# L) q: [" m2 m2 O
acceleration ;; the constant that controls how much a car speeds up or slows down by if
! `" g$ m7 R% W4 F0 |8 E ;; it is to accelerate or decelerate4 r" P }6 d# k7 X. K
phase ;; keeps track of the phase
9 R, s( O% b8 n1 D3 L num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
! M3 L# n% W( i/ w3 T; Y1 d current-light ;; the currently selected light: d( |9 W+ e5 Z* V! v0 w6 v
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;; patch agentsets
4 k# }! T; d4 p m* d intersections ;; agentset containing the patches that are intersections* {% \5 c. e9 W) e6 [/ ?5 W
roads ;; agentset containing the patches that are roads7 M" a) u* C% Z z& y& }2 \6 A2 \
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turtles-own
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speed ;; the speed of the turtle
, g: y9 H; M% T: ? up-car? ;; true if the turtle moves downwards and false if it moves to the right
5 H" j* ~3 M! U8 ]6 ` wait-time ;; the amount of time since the last time a turtle has moved
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1 G" k( W, |: gpatches-own
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intersection? ;; true if the patch is at the intersection of two roads
* O) h# P* w# S: F: c% _3 ]% a green-light-up? ;; true if the green light is above the intersection. otherwise, false.6 R) t& X8 t! H8 P7 | ]6 [; I
;; false for a non-intersection patches.; _3 n7 o8 ? J4 _) i# R! u5 f
my-row ;; the row of the intersection counting from the upper left corner of the) {. y7 O1 c; {2 ~! n
;; world. -1 for non-intersection patches.
. B- L: Q: X1 ^% o+ K my-column ;; the column of the intersection counting from the upper left corner of the2 e8 @8 k# T! R9 H& k+ J. f
;; world. -1 for non-intersection patches.
- W- _& s) O" s: k. P my-phase ;; the phase for the intersection. -1 for non-intersection patches., x; R/ M# `# }' W2 B
auto? ;; whether or not this intersection will switch automatically.
9 u4 w5 ^& ^6 i: @3 p6 B ;; false for non-intersection patches.$ E: x2 x* m$ a2 p/ r
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;;;;;;;;;;;;;;;;;;;;;;
/ m% M1 T( G* U1 [) S;; Setup Procedures ;;
0 n; g/ G( N' P) Y;;;;;;;;;;;;;;;;;;;;;;
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0 u3 P4 H; s* p;; Initialize the display by giving the global and patch variables initial values.8 v: ^& r5 G+ `0 L
;; Create num-cars of turtles if there are enough road patches for one turtle to
, M$ e6 Y# w! a2 X; k, t2 y8 ^$ d. k2 I6 |;; be created per road patch. Set up the plots.
0 V) `4 \6 N3 m' Lto setup
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& p% U# X0 d ]: e1 c2 E: J9 J$ r setup-globals/ R6 l* P- q/ u: [( n
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;; First we ask the patches to draw themselves and set up a few variables
6 F/ }, S$ F, t$ r9 P9 @ setup-patches
7 G( z, Y4 D' i) Q0 w/ A make-current one-of intersections
. u0 h, f- I" o2 ~& }7 b0 j8 e: x6 A- [ label-current
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# I2 u7 t6 a/ M9 X- c: b set-default-shape turtles "car"
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if (num-cars > count roads); z! o1 _6 l* N( N
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user-message (word "There are too many cars for the amount of "
1 k3 E0 u, S* r) s "road. Either increase the amount of roads "% `) R2 O8 _0 e6 G, z2 Q4 s! x
"by increasing the GRID-SIZE-X or "
& b, f h9 j: x# @+ _& p' e "GRID-SIZE-Y sliders, or decrease the "
% s7 X$ g* e* W4 u. d5 a "number of cars by lowering the NUMBER slider.\n"
0 r5 k- ]3 U# P0 t1 Y "The setup has stopped.")
5 g# L( E$ F, k" ] [! W+ ~ stop
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7 X: _" H% E1 q ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
( L1 l% P4 u4 K* D( T' _ crt num-cars9 p3 | n( U/ h: k
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* ^! M" n1 B9 a5 K& y setup-cars' Z4 I6 j* J( r: C5 [; p& \
set-car-color
@/ Q l+ |% d, {: g record-data
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;; give the turtles an initial speed
+ [- z8 u3 y7 ^ ask turtles [ set-car-speed ]% u$ l9 G8 E$ M4 s, M; z
; F* r2 a1 _1 S% D0 _ reset-ticks, H/ J# O& ]5 o
end2 G3 D7 U) @( N
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;; Initialize the global variables to appropriate values2 F$ V) Y" u( M1 r
to setup-globals
( h: {7 A. m" n5 ?+ \1 [7 g set current-light nobody ;; just for now, since there are no lights yet2 i4 r9 m5 `7 F7 @. w! p1 V9 V6 z
set phase 0! v9 k# a# X* z+ o; o/ @ R
set num-cars-stopped 0
' \0 X5 i+ ] k* _/ z B set grid-x-inc world-width / grid-size-x E' ?% T& R4 k% ^3 t8 \) y9 a% j
set grid-y-inc world-height / grid-size-y- `* J w g6 ~# P
9 c% g3 [3 q# S; _* Y ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary/ ?! ^( i# w5 g/ }1 _4 W
set acceleration 0.099
2 k/ p& k; i1 w4 H, I7 o/ B: dend
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0 v- ^9 B0 H1 h# ~% p;; Make the patches have appropriate colors, set up the roads and intersections agentsets,$ q3 p% ?9 m. L( f* v
;; and initialize the traffic lights to one setting
3 H) u2 \# P$ e5 rto setup-patches+ n# ?0 _1 c5 q3 t
;; initialize the patch-owned variables and color the patches to a base-color
3 w& l6 Y! _ ?* Q% E ask patches0 C* b' A; E$ I7 @$ q- s
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8 F1 b t% w8 L) H6 K set intersection? false
( J4 @/ y" V' `. r. C3 l set auto? false
3 w C% l/ c/ C( @7 d( S" c J set green-light-up? true
, z) a5 U) g$ ?) V7 n& x3 v. t0 [ set my-row -1
; Y0 `2 Y2 _0 \% T- }4 [2 {' I set my-column -1
. G( @& q H4 u. x set my-phase -1
1 Z. X6 r+ \: T) y set pcolor brown + 38 w* A; E6 b5 ^8 R- h4 M5 F
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;; initialize the global variables that hold patch agentsets' K% m2 ~2 H% t' k9 ^& v' Z
set roads patches with
- i3 U' B$ {- y+ p) A [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or9 u; C' `- B0 q
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]- T7 Q& w. X% D& r( _
set intersections roads with6 w; i/ B* ~1 ?1 _ w i% {' m
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
+ S$ J8 A9 i7 w, ~7 @8 b- B (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
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end6 ^* m6 H1 M# m( u
其中定义道路的句子,如下所示,是什么意思啊?
* N, {5 f9 e( Q, J( H! g6 N set roads patches with
# A9 p/ y/ t- @: Y: Q2 d4 }$ G [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or( |! V/ E# e' a |( ^4 l
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
3 J1 r: s( C) _/ |) o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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