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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。
9 h# K9 A3 U% _. f$ q- nnetlogo自带的social science--traffic grid这一例子当中,7 ]: N+ {8 P/ x |# M8 Z, P! o
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction5 b1 r% u: o6 e. I$ R9 m, n! C8 [9 s
grid-y-inc ;; the amount of patches in between two roads in the y direction' T/ u9 ]0 y0 Z! z% H Q: y& J: ]
acceleration ;; the constant that controls how much a car speeds up or slows down by if
4 z4 }! I! Z5 i8 I* q7 {4 {+ H ;; it is to accelerate or decelerate8 t- r5 P/ x# Z6 w$ M6 Y
phase ;; keeps track of the phase
: p2 V8 F! _$ T7 |9 t& r2 k num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure2 W. J- V8 }6 ~4 H1 I' g
current-light ;; the currently selected light( l6 \7 M" _7 r
- v4 v# J( d) t ;; patch agentsets" W+ n4 r3 y! j
intersections ;; agentset containing the patches that are intersections
+ N; p, y0 v( U8 R# ^ roads ;; agentset containing the patches that are roads
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turtles-own
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speed ;; the speed of the turtle
% e, L1 b+ Q. h) f up-car? ;; true if the turtle moves downwards and false if it moves to the right
4 a$ b, r9 K8 E0 Z wait-time ;; the amount of time since the last time a turtle has moved" z. ~ c) T! b8 C! o n, e. K
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; P6 S4 v x$ S& dpatches-own" |) u0 i0 { F9 C! T
[
" Y# c7 q3 @8 {# s( X; e. @9 Q intersection? ;; true if the patch is at the intersection of two roads
+ _7 @' c8 p# }; R1 W) E green-light-up? ;; true if the green light is above the intersection. otherwise, false.
+ a7 x6 V" _' M$ H ;; false for a non-intersection patches.
# l* q3 X# |) r7 O my-row ;; the row of the intersection counting from the upper left corner of the1 k' W, }6 S; p7 }
;; world. -1 for non-intersection patches.1 M( U" p$ q5 W) z1 n/ c2 c
my-column ;; the column of the intersection counting from the upper left corner of the, M6 Q6 b1 ^' A
;; world. -1 for non-intersection patches.
& K/ \+ z; p) o$ [ my-phase ;; the phase for the intersection. -1 for non-intersection patches.5 p1 T0 Z' U1 o# S$ D% W
auto? ;; whether or not this intersection will switch automatically.( ]8 e0 \) X& Q+ a4 y5 q) U
;; false for non-intersection patches.) p) y, o' [1 f
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;;;;;;;;;;;;;;;;;;;;;;
/ c" k' `) E- [- S4 w2 X& y' }1 E;; Setup Procedures ;;
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;; Initialize the display by giving the global and patch variables initial values.
2 t7 ]& G" `6 S9 V: V;; Create num-cars of turtles if there are enough road patches for one turtle to3 V: q7 x2 N( r
;; be created per road patch. Set up the plots.
4 J# S: g4 S" @0 u, Ito setup+ b+ h3 x: v& Z: x. W% d( G( d, D
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setup-globals
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; L' M8 D0 f# e+ o7 f5 g2 i3 U) L ;; First we ask the patches to draw themselves and set up a few variables5 l% v% C9 c6 V( a" m) M8 g1 S# C: `0 u
setup-patches# M0 [2 Z, T; D3 ?. I
make-current one-of intersections
! E8 ?0 d+ V" M# K' k label-current4 b3 S, J; Z, Z% ~8 \
* S2 C0 | M) s ]( m set-default-shape turtles "car"6 R4 ^& U; O$ N y$ S
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if (num-cars > count roads)
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) B; I/ ~( S+ u9 D) | user-message (word "There are too many cars for the amount of "7 w0 I5 s" S6 n7 F6 N
"road. Either increase the amount of roads "
( y1 E3 O% n% g# B "by increasing the GRID-SIZE-X or "( x( }( y, D( C2 l7 t) }
"GRID-SIZE-Y sliders, or decrease the "
+ n4 {4 ^$ E! Z) u8 |, s "number of cars by lowering the NUMBER slider.\n"
$ e. Q# a5 F; h! A6 e6 O# r/ D "The setup has stopped.")
4 e5 b) x, O- L' k2 i9 ? stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color9 ^& j# Q1 Z2 R
crt num-cars2 g9 l, o ?5 G, I% C( o
[
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set-car-color
3 v+ G/ X( F, L2 n' j# h7 g o! ] record-data
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( @) B9 I* u& O0 q ;; give the turtles an initial speed
% D" c5 G% _* R& B# k ask turtles [ set-car-speed ]8 S0 S. m7 ]4 k
9 n3 ^, C6 I; e G7 } reset-ticks ^, D7 L* Y3 X. M
end
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: ?9 u0 p o5 ]+ a+ d;; Initialize the global variables to appropriate values
* T8 l: H: V- E. F' Z4 Dto setup-globals
* y5 O! X3 W4 p( a5 I( W5 M set current-light nobody ;; just for now, since there are no lights yet
4 k1 R- V& t" c' f& o1 N; W: ^ set phase 05 l8 E2 D4 L3 a) U+ E- f
set num-cars-stopped 0
1 K$ d* \ S; ~! M set grid-x-inc world-width / grid-size-x2 B& R0 C" Z! L9 w# d$ K
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* ]2 ?3 F( L% Q' W
set acceleration 0.099
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7 l7 b; f; U4 g" d1 R( Y+ g;; Make the patches have appropriate colors, set up the roads and intersections agentsets,( Z( L0 i/ O V: P8 S
;; and initialize the traffic lights to one setting! ?: M" S/ x: @* q' C$ `
to setup-patches
1 ? \2 k: c. o1 o# n3 a' v ;; initialize the patch-owned variables and color the patches to a base-color1 _6 V8 C9 f9 r0 A3 R ?
ask patches
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. D4 o7 w7 \# S t set intersection? false, J) Y0 L) u* s; o
set auto? false1 V" Z4 W# R/ y; X6 N, b1 T
set green-light-up? true- K: G [: }9 C; r
set my-row -1% x) E. h \/ k+ d
set my-column -1
7 z* t S B) T/ F: W5 m& P) R6 P( D set my-phase -1 }9 G/ K$ ^3 V9 ~4 J n
set pcolor brown + 3- l4 y8 c8 _3 ?7 c2 f6 n
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7 Z5 r+ p$ B% G, E ;; initialize the global variables that hold patch agentsets9 V6 W* `" c# z* }. a+ n; n
set roads patches with& s+ M y' s, r1 ^
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or" i6 M9 ~3 Y J5 `3 H
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]; A6 C. h9 v5 w- r5 f A( u' Z/ b
set intersections roads with9 C5 a6 [1 w: c. u, @
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
# L) z- H% J8 V" [+ ~9 _ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
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其中定义道路的句子,如下所示,是什么意思啊?
- Y6 ~% {3 |5 L6 }2 h/ ~ set roads patches with
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(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
* }: c; L, V X1 R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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