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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。* E# i1 ] M4 K# a5 M$ H6 d% B$ q
netlogo自带的social science--traffic grid这一例子当中,
$ b' T2 Y0 h& [! l0 Y9 _ B. kglobals% U+ L; I) L* F
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. k4 C s& K7 j5 P& q grid-x-inc ;; the amount of patches in between two roads in the x direction% |9 J6 }) P. Z0 a% N' M
grid-y-inc ;; the amount of patches in between two roads in the y direction. a: p1 H4 r& u, r
acceleration ;; the constant that controls how much a car speeds up or slows down by if2 R5 \3 D4 k, x5 w) n
;; it is to accelerate or decelerate
( V) ?; x7 B w) [ phase ;; keeps track of the phase& b' w- x6 u3 \; {7 L# \
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
. q5 r8 |) ^( w# b4 g. J5 S: i& ]" m$ E current-light ;; the currently selected light
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5 S' j0 n2 n3 |( s% H ;; patch agentsets6 A# z" P& H f5 `; D$ ]
intersections ;; agentset containing the patches that are intersections
0 a5 O! k: T) } W5 g roads ;; agentset containing the patches that are roads
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turtles-own
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speed ;; the speed of the turtle" O7 b# T# Z5 w/ l) L
up-car? ;; true if the turtle moves downwards and false if it moves to the right
* O$ R- E9 ~& G y wait-time ;; the amount of time since the last time a turtle has moved
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7 X z# i- h* ]( t4 Z8 _5 ]patches-own
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% a( ?! A) m7 J' S( G, @- ~ intersection? ;; true if the patch is at the intersection of two roads
+ K& u/ ]% F' R$ Y$ g$ J green-light-up? ;; true if the green light is above the intersection. otherwise, false.1 O' O/ i$ R3 L! J! ~3 J
;; false for a non-intersection patches.) P4 F2 A0 v5 |/ u- J& a/ p$ b
my-row ;; the row of the intersection counting from the upper left corner of the. j8 ?! G9 U, v! _# n) X
;; world. -1 for non-intersection patches.; D8 M& N p2 ~; J& @% ?
my-column ;; the column of the intersection counting from the upper left corner of the
|# a! ]+ `# B4 x* f% ], G$ B4 u6 Q ;; world. -1 for non-intersection patches.- \7 h( ^2 o! o3 e3 g( _. B
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
. t+ Y6 C; a/ A) A0 s2 ~ r auto? ;; whether or not this intersection will switch automatically.
' n" T- z* N h. r1 G9 } ;; false for non-intersection patches.* T4 t2 Z- A5 D
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;;;;;;;;;;;;;;;;;;;;;;
0 O6 _9 A8 Y2 U;; Setup Procedures ;;
& ~. \. j/ N+ G) |;;;;;;;;;;;;;;;;;;;;;;& i& W1 Q/ D- M3 s! {
5 e6 g& R% H# c* L( \;; Initialize the display by giving the global and patch variables initial values.
/ f5 x2 J( H% D9 o! w d;; Create num-cars of turtles if there are enough road patches for one turtle to
) t5 o3 G8 N/ C+ A+ Q. J;; be created per road patch. Set up the plots.
. R. p( t3 h, b* Z; @$ bto setup
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setup-globals
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: D4 _ Q$ T- _# J. l7 m ;; First we ask the patches to draw themselves and set up a few variables
2 ^* Z. v% X4 M setup-patches& B' i/ {8 S3 z" J! Q7 w
make-current one-of intersections* d5 b( Z, K! b) D
label-current, K: B5 u$ o! N: Y/ n0 G
9 |( g0 \2 K7 _ set-default-shape turtles "car"
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if (num-cars > count roads). V8 ~9 x0 j z
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8 @7 `2 E4 J4 b, I9 P- M user-message (word "There are too many cars for the amount of "
4 }6 R' ~) F* @$ p3 u; t "road. Either increase the amount of roads "
. i) Q8 q* M6 K( l6 b8 ]5 W "by increasing the GRID-SIZE-X or "
; E+ k/ k) q! P G6 {5 |6 T# K1 w "GRID-SIZE-Y sliders, or decrease the "
6 F' d( k; z' {. v "number of cars by lowering the NUMBER slider.\n"
. T$ k, f7 G' s' b2 L2 k; y5 U "The setup has stopped.")- |& ]% B1 k% \5 \. X
stop1 x/ i, z) p, {. h( m9 r' P
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color1 {( F I. w9 w5 V+ b3 N, j
crt num-cars: [, M" B6 d0 z! ~2 M x
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setup-cars3 G- K h! G3 V8 s' R! a. z/ p* h
set-car-color
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;; give the turtles an initial speed8 k, `1 \) O! M! d. h
ask turtles [ set-car-speed ]; ?1 G* S0 y' X9 G9 {4 |$ _, U
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reset-ticks2 w" x0 ]4 [7 L- x: W
end
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;; Initialize the global variables to appropriate values7 v3 D( l- q6 | H( C
to setup-globals9 U/ O' m% d+ E' g
set current-light nobody ;; just for now, since there are no lights yet& Z, G" m) E! U# q4 X3 ]0 f( E
set phase 0
+ }+ [/ W( p3 J# t# k set num-cars-stopped 0
, j- r* h" b) ~ B set grid-x-inc world-width / grid-size-x0 f7 `4 M) B; d8 |9 W
set grid-y-inc world-height / grid-size-y: F- {, ?( X: X3 S ^
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary+ T6 {8 ~: @7 l( b/ a
set acceleration 0.099( a9 R& ]5 S* b1 J& f: U" d
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,. p3 S4 [/ T$ F0 H7 X4 Y
;; and initialize the traffic lights to one setting! V% s! ^, ^: t% R4 h
to setup-patches" J( F! s2 g+ ^( Z1 Y/ l
;; initialize the patch-owned variables and color the patches to a base-color/ d! K% [* r- B9 L5 d R
ask patches
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set intersection? false: \. {8 A# U8 V1 W: k
set auto? false
1 X! u! A) `' y- Q: Q6 {' R set green-light-up? true$ N# P/ R* k! X) P: c& q* d
set my-row -1$ P& g3 z8 j/ ~; w4 ]2 [
set my-column -17 E! L) t8 _0 l9 S
set my-phase -1
0 g7 p9 E8 d v, D3 ~8 d m set pcolor brown + 3
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* b' y, B+ K/ F4 x ;; initialize the global variables that hold patch agentsets% a3 y4 o* u4 m$ ?+ D( G
set roads patches with2 v, u; d1 ~: g' B5 n( Z3 l+ _+ q
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or& O# i2 V8 h" {
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 y a1 ]4 d7 U8 }2 x: y
set intersections roads with3 F- g6 x4 I( S8 z/ a: ]* s
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
9 x7 X* p; M" X# v& Z (floor((pycor + max-pycor) mod grid-y-inc) = 0)]* r/ I/ d+ u/ Z/ u7 _! J: o( D
4 o1 m( m' }2 h+ W3 d ask roads [ set pcolor white ]. L/ [: U: t) R. A, y2 x+ F m
setup-intersections
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2 p: P/ x4 x; o0 E5 i$ K3 \! l7 b其中定义道路的句子,如下所示,是什么意思啊?
4 t5 W+ X/ H. b$ S' |) n set roads patches with4 P/ M9 a5 N7 i7 I9 i: `- x. N9 z
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
& f& y; r0 e: } (floor((pycor + max-pycor) mod grid-y-inc) = 0)]& w+ w: D! m3 U
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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