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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 \4 f6 P0 e% |netlogo自带的social science--traffic grid这一例子当中,# `" l7 |4 m- U% N8 O, p; S
globals
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9 |& e4 \; |/ t/ b! z grid-x-inc ;; the amount of patches in between two roads in the x direction' C6 h9 v# S D; |5 S* A
grid-y-inc ;; the amount of patches in between two roads in the y direction
) f5 ~$ X3 c/ Y) w3 n/ ]" [ acceleration ;; the constant that controls how much a car speeds up or slows down by if9 H' F8 f3 r# W3 V/ G5 P6 e
;; it is to accelerate or decelerate4 k5 Q* Y3 _( i! l4 H. s' B' `) E& U
phase ;; keeps track of the phase; j- W/ T: {. B: T8 J
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure9 g- T& y2 k9 c2 C* c
current-light ;; the currently selected light$ B. s. l2 \: v/ q2 V* g: f
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;; patch agentsets5 R. o& @ `) Z
intersections ;; agentset containing the patches that are intersections, y* I4 r/ D$ h' m, k5 c' d( i
roads ;; agentset containing the patches that are roads5 B4 ]7 o* b3 O& N# R5 J+ b" o$ \
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" {2 n P4 d h- j6 Jturtles-own
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speed ;; the speed of the turtle
6 ?+ I2 {4 M5 u0 r& j, L( J up-car? ;; true if the turtle moves downwards and false if it moves to the right
( d! s( e) T% ?1 w, ?4 [ wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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1 Q3 _3 d: d6 {0 u. B5 e9 e intersection? ;; true if the patch is at the intersection of two roads4 V0 Z" k5 z/ o# y' k* f9 C- i
green-light-up? ;; true if the green light is above the intersection. otherwise, false." [9 n) p/ D. J% {3 N
;; false for a non-intersection patches.
- N8 q* b6 K8 W+ |/ ?. G5 g/ p my-row ;; the row of the intersection counting from the upper left corner of the
5 K& v1 R/ A0 M ;; world. -1 for non-intersection patches.: K" ?& A/ C+ Y* |
my-column ;; the column of the intersection counting from the upper left corner of the# g2 N% }( z. T& |& N
;; world. -1 for non-intersection patches.
0 ~8 b+ y0 h" o0 d* D my-phase ;; the phase for the intersection. -1 for non-intersection patches.
6 {# U# d) R0 g7 w( H4 C1 Q auto? ;; whether or not this intersection will switch automatically.7 k$ f2 O& @: E" D$ X
;; false for non-intersection patches.
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6 b Z& n s. b;;;;;;;;;;;;;;;;;;;;;;; _# y$ o, w" E+ x; t
;; Setup Procedures ;;
# X! j/ C7 ?, S* O$ s& |6 r;;;;;;;;;;;;;;;;;;;;;;
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( p3 G8 V, q# N k3 w0 q;; Initialize the display by giving the global and patch variables initial values.. k5 x5 E, U0 J( J8 Y
;; Create num-cars of turtles if there are enough road patches for one turtle to ~7 C! r9 N. J9 R, }
;; be created per road patch. Set up the plots.$ @4 w7 ~- z2 {* T( y9 S
to setup& g5 [8 ^6 m6 Y) v9 Z% B: o
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setup-globals
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% F0 E' e: |1 R! V+ p1 ?8 b; _( d ;; First we ask the patches to draw themselves and set up a few variables
- E, }/ M+ D9 b6 W& M; e2 u! K setup-patches0 L3 D7 N7 s4 _7 \
make-current one-of intersections5 G# b- D2 V: p5 e, R: C6 U
label-current- g4 N8 B$ a+ C6 [, E, p; b
. _3 ~) g) [. d( \. k- I5 @3 J/ E set-default-shape turtles "car"# B; J4 ] Z9 O! v. ?2 E/ \6 ]
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if (num-cars > count roads)4 k; j2 E0 P) w% d2 H# C
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user-message (word "There are too many cars for the amount of "
; _) M1 O/ d& K) O/ r "road. Either increase the amount of roads "; C- }( W+ p2 B
"by increasing the GRID-SIZE-X or "
4 Z9 [ }4 ?9 x& q" V* n! ] "GRID-SIZE-Y sliders, or decrease the "
0 R W4 \! }9 ~% ?" U "number of cars by lowering the NUMBER slider.\n"6 g, n0 Y& p6 u# L" G8 s9 X) S, p( P
"The setup has stopped.")
M, Y5 g, [3 E4 i: F. i; } stop
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" |8 \, k# o# r ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color; |3 E) }# [- k4 q. G( p! E
crt num-cars, I3 j2 g' ` `! `( T
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set-car-color* ~' ?. {7 J0 s. e$ W1 ^
record-data
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" M, M- L* m6 K- ~# ^6 ]# K: k- `' [% t ;; give the turtles an initial speed% e6 h- ^5 ^: J
ask turtles [ set-car-speed ]" V9 A$ j0 T3 ?/ u! M# V" E
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reset-ticks! a C7 G8 d$ m& c' i2 E% q8 {
end
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;; Initialize the global variables to appropriate values# V4 F# {4 V; C% `
to setup-globals3 |$ ~5 d# h7 J0 ?4 t. C, ~9 G
set current-light nobody ;; just for now, since there are no lights yet/ H+ a4 a! F! E2 F
set phase 0' V% l, |4 C! @( c, g, x
set num-cars-stopped 0
/ }9 V! S$ U5 t. q5 e set grid-x-inc world-width / grid-size-x" Z$ d3 H8 Y$ E) c. g# F/ L! V
set grid-y-inc world-height / grid-size-y3 P& f& }# B. 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* u6 v8 o' y& R3 I
set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,8 _0 A8 M8 S: t/ s
;; and initialize the traffic lights to one setting
' a) q3 Y/ O5 Gto setup-patches; k. O$ P8 }1 Z! P
;; initialize the patch-owned variables and color the patches to a base-color& P% x0 g5 i9 `. n: z
ask patches
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set intersection? false
$ P m' i$ P: t2 A set auto? false
! f* `5 i$ H* ?4 | set green-light-up? true
' R& K" c% }# d# `& \8 N8 z set my-row -1) A+ D9 c* t2 m' ~) h& E& ^+ H6 Q& R
set my-column -1
7 I2 L$ [8 S1 X0 F+ ^8 I set my-phase -1
2 `; d2 M6 d9 {" _# h; F% `6 O% d set pcolor brown + 39 e: l! \% W1 C8 d+ P4 u# W
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' R& F ` z4 P" l+ E! h ;; initialize the global variables that hold patch agentsets% h: d' { O4 B
set roads patches with0 w+ R' |# L5 N) m, U! ^9 K4 l+ Y
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
% i) `2 x2 |" Y1 L5 z (floor((pycor + max-pycor) mod grid-y-inc) = 0)]& a3 p9 ]: E5 J8 K9 D5 i
set intersections roads with: M9 r. I1 ^0 c: N5 S
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
% I/ Z" K! F5 D! d5 \ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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& a( p- N+ T1 I% E Z+ F ask roads [ set pcolor white ]
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& P8 q$ D3 L# d( O/ Q其中定义道路的句子,如下所示,是什么意思啊?
, h3 q% d1 i$ F/ N) ~9 y set roads patches with; {, d' _5 G2 B, b7 c3 i
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or, y, @! ?: ?8 k2 c, w( f& j
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]+ x$ P0 e' M6 {( n6 s1 J# `
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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