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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。/ k7 N- p. e& A# ~, B: Q+ B* ?
netlogo自带的social science--traffic grid这一例子当中,4 Z6 p' W' g' J2 x4 W; O/ T
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
% V- r6 i5 G/ n! ~' S( s: U grid-y-inc ;; the amount of patches in between two roads in the y direction! X' G* i) U, l% `; o; h
acceleration ;; the constant that controls how much a car speeds up or slows down by if6 s: U. I1 u& x @1 X* r
;; it is to accelerate or decelerate7 d& F* M% \; u* H/ w8 A
phase ;; keeps track of the phase
* } A# Y; a1 f8 \ num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure6 o& n+ g0 s4 W5 i! n
current-light ;; the currently selected light
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, A) \8 M8 z6 Q; s, m ;; patch agentsets
( k( e& W) G; ]1 f* x7 B' P intersections ;; agentset containing the patches that are intersections
1 R6 m- ^6 w% i8 p* K! D roads ;; agentset containing the patches that are roads0 }* _# B, O. _1 e/ R) a& q; ^
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turtles-own" b. U, S& R, S( N7 ~: @) K. f, c
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speed ;; the speed of the turtle+ b; x+ i, w- Z0 K x
up-car? ;; true if the turtle moves downwards and false if it moves to the right
; z6 k/ A( Y" N; o wait-time ;; the amount of time since the last time a turtle has moved
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patches-own. l \" W+ C4 K
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intersection? ;; true if the patch is at the intersection of two roads" I( @! n( @9 a
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
@2 R7 N: |5 ~2 t$ I# x+ A ;; false for a non-intersection patches.
# _* |- R, T( Q my-row ;; the row of the intersection counting from the upper left corner of the
2 L6 d. ^: H8 O9 R; t ;; world. -1 for non-intersection patches.! o" m2 C2 [# _
my-column ;; the column of the intersection counting from the upper left corner of the
- \. H% B/ R$ i$ a2 X5 q ;; world. -1 for non-intersection patches.
9 R4 W0 q3 q0 I0 N/ p my-phase ;; the phase for the intersection. -1 for non-intersection patches.
, j) h6 n2 ?3 o& x/ \1 A! b, V auto? ;; whether or not this intersection will switch automatically.
|2 E: ]- d' { ;; false for non-intersection patches.- ~" T, W7 K( O: f2 Y, P. C2 G
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# }% H8 J5 k1 g8 {;;;;;;;;;;;;;;;;;;;;;;
$ a9 ]& ^4 v4 z4 d5 K4 y# a" D1 m;; Setup Procedures ;;# y5 X6 g: C& `- L! `2 z. o
;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.- S* p* K" N, x" \) N
;; Create num-cars of turtles if there are enough road patches for one turtle to
9 d X7 A5 q) h' J;; be created per road patch. Set up the plots.9 _5 S2 M" ? c' k5 l
to setup
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) J9 X/ z' s% K! X- l setup-globals, }% ^% o* j/ ]4 q3 f, t% V5 C
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;; First we ask the patches to draw themselves and set up a few variables
5 L- _! D, d5 B! _: L% z% T setup-patches
r8 j6 b6 i f0 m( |9 u2 _ make-current one-of intersections
* ^$ ?& j. |. K7 x$ @8 w label-current4 q; z9 V8 S/ H$ b0 S
! K0 n. P( E+ l, i2 | set-default-shape turtles "car"6 b( S3 U& d7 n, P- |# l$ V4 e* I
/ m0 D- g) C' R% y% ? if (num-cars > count roads)3 a8 @- u' Y" ^' ?3 o5 Y& ^
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user-message (word "There are too many cars for the amount of ", D" a8 W/ j4 _1 D8 E; _. h$ ? X; T* c: I" L
"road. Either increase the amount of roads "
, x1 V: a" ]+ J3 T! x "by increasing the GRID-SIZE-X or "+ ~$ ]5 z: h+ }* b% j7 y
"GRID-SIZE-Y sliders, or decrease the "
9 g4 E/ k3 f9 d% R0 }; x "number of cars by lowering the NUMBER slider.\n"! u4 I5 L# s# Y
"The setup has stopped.")6 K% l, ~7 r: |9 d, v* `
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color+ z: L2 R2 a( u! d' R, C
crt num-cars
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. Q8 Q/ o# r' n+ T4 M9 w setup-cars
/ k1 S6 T% O. ]! Q set-car-color
* V& O& H3 B- N0 j! m record-data: q* c9 z! e& ^5 F. |9 Q
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;; give the turtles an initial speed, h: V5 M x9 s3 G
ask turtles [ set-car-speed ]0 n4 C! }9 n9 r- { i/ j' `
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reset-ticks+ ^, S+ L* A7 _, A. J
end
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;; Initialize the global variables to appropriate values8 E+ g; C7 X9 j3 D; F& R) B4 K8 b- R
to setup-globals
0 n D4 z z/ x" k# \; o set current-light nobody ;; just for now, since there are no lights yet
9 G$ A, y( m6 ~' E* M set phase 09 J4 c6 A( p: F( ?# Z- W
set num-cars-stopped 0
4 x) C+ d: K4 V- m* D/ R5 F set grid-x-inc world-width / grid-size-x* N+ m q- j6 F( b
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' f; T$ Y: _1 ~5 |
set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,. L; n! l% D8 j5 h& G
;; and initialize the traffic lights to one setting. m) ]9 e$ x( B6 U9 E
to setup-patches
; Y& s% ^8 T I3 M* ?0 n. Z ;; initialize the patch-owned variables and color the patches to a base-color2 j- y5 [+ C; i- W
ask patches" A( g3 c+ G( C* f1 W
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set intersection? false5 T2 e/ a" p- R- w) U. k. g
set auto? false5 S0 b. G5 Z' x& l6 r& S# v
set green-light-up? true$ V; q6 g. Q! v5 P
set my-row -1' D& ]9 k0 B8 |, z( F1 D0 v7 A
set my-column -1
# N/ c; H6 | O! \6 W set my-phase -1
7 A0 k. {* `" l" ~* ` set pcolor brown + 35 t% C: x& ]2 O+ k! ^
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;; initialize the global variables that hold patch agentsets6 f! w6 S; c* e5 g7 T* ?3 @
set roads patches with- R9 {( P4 R l. w$ G2 w1 m# i
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or! }& m6 L5 D! T) I0 i
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]/ L; o, i8 b4 P) U( n
set intersections roads with
, D/ w% b+ S5 ]' ?* Y8 _# z, ~7 P. x [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and; a" S4 q! Q: U5 @, N
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]) z, k0 N* n# A5 o9 B
setup-intersections; A' y' Q- N2 A3 L
end
& ^6 G% B" f6 D5 f& b其中定义道路的句子,如下所示,是什么意思啊?; s# M, j0 v5 X
set roads patches with8 N* I+ A- m3 n. ?/ r5 E
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or$ J0 O4 h9 ^/ t: Q2 |4 H
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]! ] n/ o* c7 [# Y% 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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