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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。/ y& m: \8 I% p% p# U y1 g' @
netlogo自带的social science--traffic grid这一例子当中,' Z* g7 m' v7 D: b5 J
globals. w' x* Q2 B( n7 c
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grid-x-inc ;; the amount of patches in between two roads in the x direction# S& O' T0 v# o2 d# B' o& Z
grid-y-inc ;; the amount of patches in between two roads in the y direction# Q$ g8 U# P) ^: D' i7 `9 t
acceleration ;; the constant that controls how much a car speeds up or slows down by if6 s4 e- X. B' p9 C& f7 ?
;; it is to accelerate or decelerate3 P7 y; Z( f0 @& a
phase ;; keeps track of the phase. y- n" b% \; C2 j4 f5 ^
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
$ ~5 t6 @; g! |! t current-light ;; the currently selected light
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;; patch agentsets
* V# a8 H5 ^5 | intersections ;; agentset containing the patches that are intersections
4 [2 [# s( A( E: ^ roads ;; agentset containing the patches that are roads% ?- }, c7 {7 f5 D
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2 `, \9 n" y" _' f' Q2 gturtles-own
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speed ;; the speed of the turtle2 Y9 ^6 c! A6 D8 p0 A
up-car? ;; true if the turtle moves downwards and false if it moves to the right
( `# ^+ ]6 k, _ wait-time ;; the amount of time since the last time a turtle has moved
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- V0 q& T V" \! _patches-own
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* Z9 G3 r2 Q2 s* u6 w2 L* R intersection? ;; true if the patch is at the intersection of two roads- G3 ^$ s! }2 p6 e' W4 v
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
& ]; y! g, d, w. t: n# \& u. p ;; false for a non-intersection patches.; ~ z# p6 A3 X6 B1 X
my-row ;; the row of the intersection counting from the upper left corner of the' P( [* F9 F$ v- N. W
;; world. -1 for non-intersection patches.
- b. Q: r. g- b' P d* G @ my-column ;; the column of the intersection counting from the upper left corner of the2 @1 O5 m# }; E, l
;; world. -1 for non-intersection patches.
8 @9 J. Q: `0 i% z0 K my-phase ;; the phase for the intersection. -1 for non-intersection patches.
4 D9 }; n+ e% N( p6 |" O9 d auto? ;; whether or not this intersection will switch automatically.
, s* S" W3 U" Y8 L# F ;; false for non-intersection patches.
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- h2 C; g' ?' o;;;;;;;;;;;;;;;;;;;;;;
% ^( w5 g8 G r3 R. l;; Setup Procedures ;;
5 |6 ]( V& l0 f9 K;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values." V& S3 v, B4 O1 K1 z3 t
;; Create num-cars of turtles if there are enough road patches for one turtle to$ p# r6 `. w8 [2 T4 O! ]: _% S: O
;; be created per road patch. Set up the plots.
5 ]% U0 n: y6 hto setup
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setup-globals) O; F/ z Y$ C5 _- s V
$ e' ^! v: Y, U; Q E0 {# ` ;; First we ask the patches to draw themselves and set up a few variables
5 g6 k$ u, J1 }) r4 F" N setup-patches
( R9 `3 y7 {0 H& Z+ A' T4 I' m make-current one-of intersections
" L3 C6 `) z2 N, N7 ~. l label-current: x3 |/ _4 ^5 C
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set-default-shape turtles "car"
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if (num-cars > count roads)7 b3 Y# _2 Y& ]$ \1 `' c
[
/ N9 [4 k/ ]5 B user-message (word "There are too many cars for the amount of "
* H! j$ T8 I1 ^* {" p3 C- K "road. Either increase the amount of roads "+ s$ |" H( G" {& G2 p! k: A
"by increasing the GRID-SIZE-X or "
+ R1 G7 B( S i5 w7 T- T" V "GRID-SIZE-Y sliders, or decrease the "( X/ N) m' ~4 m% S1 K
"number of cars by lowering the NUMBER slider.\n"
/ G0 B5 I4 C' e# J4 q "The setup has stopped.")
: B$ a5 t( d7 ~& G; G stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color) E, ~* B4 U7 J3 q
crt num-cars
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& G K/ d, }4 U0 O5 v setup-cars
8 E( f3 X7 e& ~: i- N set-car-color' S% W( }5 j3 ]- g
record-data- z, Y" W2 D0 ^, D/ A5 e
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;; give the turtles an initial speed" i; u4 h$ T! R% Z! ?6 l( N4 c! c
ask turtles [ set-car-speed ]
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. f4 r+ n* s- F) `1 B5 X& o reset-ticks, z, E& ~" x8 n- G7 U
end
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X; q& P2 X6 ]0 ]0 T( P" X, ~;; Initialize the global variables to appropriate values: n( H) v8 m! s( Y9 U: S9 T
to setup-globals
" c; E& A, V. O8 k0 P) J% z set current-light nobody ;; just for now, since there are no lights yet
6 ?6 Q+ r/ a) V, N1 ~ set phase 0
* ^+ A. T0 |# q! B. p3 ? set num-cars-stopped 0
: [8 ^9 W, T& Q& n$ T2 _. n set grid-x-inc world-width / grid-size-x
+ J% m7 v9 {2 e w; j9 p set grid-y-inc world-height / grid-size-y' ]8 x4 D/ @% Z" ^, {9 _& J
' O+ y. z! a. h ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
0 K( W$ l. s/ r3 ?; a set acceleration 0.099
' h; w" Y3 m5 J9 G9 bend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,$ q0 O; C% p9 W$ V, u
;; and initialize the traffic lights to one setting( _$ |. t/ V3 L# b& r: c2 j
to setup-patches& x( s) l& U. z9 c+ J; p3 C3 T
;; initialize the patch-owned variables and color the patches to a base-color
7 C4 e) O5 c7 Y2 P6 G ask patches5 ~6 I( g& |# {/ O1 e# T
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1 ^# V* e5 v; ~! Y set intersection? false1 a1 y7 H' `5 q9 P
set auto? false
$ \) B+ m5 i5 `3 |7 E/ | set green-light-up? true
`" S) r y8 P set my-row -1+ d" u3 n9 S& u) ]; d0 f9 h
set my-column -1
& d% d' n! D, ^# }( g6 a0 d set my-phase -1
( W! {: K- [4 Y5 s5 {; Z3 I2 I0 S2 r set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
( n" Y6 z8 {- T4 N! E" H7 w, v set roads patches with
' u! \# D% [# ^. _, A4 \ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
( W6 c$ @" K- O0 m( A4 s" Z6 x/ } (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 I) O5 V: f: K0 Z set intersections roads with1 S# \1 y) K( u X+ {5 h3 _
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and0 C: |+ v5 a7 m' n( ?$ U% ]+ p+ D
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]) O' z% Z% P+ _: R3 o8 l: P0 X1 p
# G" [% `: v0 f, x2 | ask roads [ set pcolor white ]6 t3 s( t# s* ]* t* W: x: U8 t
setup-intersections
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其中定义道路的句子,如下所示,是什么意思啊?
9 L' t1 D+ T* X4 ` set roads patches with/ z4 v m! {1 D# y9 }- b1 P; ~
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
" P0 k0 A8 B% V (floor((pycor + max-pycor) mod grid-y-inc) = 0)]/ A" q3 R' m) d/ K2 `( M. s% Y
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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