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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。
6 r8 _" s g6 V/ i3 b& n) C4 [0 znetlogo自带的social science--traffic grid这一例子当中,/ A! F4 n$ X5 [) T& j5 ?- T, t
globals6 q$ L1 y; f( L1 Y2 a# x* F
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9 c$ l9 _5 w2 Q& k4 D, }- s grid-x-inc ;; the amount of patches in between two roads in the x direction
. @- J7 `& t8 x9 w* { grid-y-inc ;; the amount of patches in between two roads in the y direction
- d- G9 v0 A% c9 h. p6 ^2 g# S- Y acceleration ;; the constant that controls how much a car speeds up or slows down by if6 W& d( Y# |" F5 ^
;; it is to accelerate or decelerate& Q' B9 Q' s, {! w% r* [# E* V
phase ;; keeps track of the phase
! K$ @6 m7 I) S) r2 e4 ? num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure }2 E& D [# X2 c
current-light ;; the currently selected light
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) m2 ^1 G3 ^% f. |4 V ;; patch agentsets8 _5 `6 f; G' I* P! u' D( o
intersections ;; agentset containing the patches that are intersections4 {! D, H* V1 \0 j4 ~. j
roads ;; agentset containing the patches that are roads
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turtles-own
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speed ;; the speed of the turtle
5 n6 c( Z8 G: o! ? up-car? ;; true if the turtle moves downwards and false if it moves to the right
' x; h! C9 ?8 m wait-time ;; the amount of time since the last time a turtle has moved
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patches-own& B( q1 G# u! A3 K, l" [) |
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intersection? ;; true if the patch is at the intersection of two roads( p4 T" W8 g3 X4 m8 ~4 ~
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
}+ x/ z! a' t8 S9 M" w+ |1 P2 P ;; false for a non-intersection patches.6 y$ R( x7 U4 }- n9 b W) ]
my-row ;; the row of the intersection counting from the upper left corner of the
! }2 V; M1 N, ^9 r" | ;; world. -1 for non-intersection patches.
- t/ G! V+ n: C my-column ;; the column of the intersection counting from the upper left corner of the
! c. V# ^1 i2 Z1 X ;; world. -1 for non-intersection patches., t# i, e8 f6 I4 g5 ?
my-phase ;; the phase for the intersection. -1 for non-intersection patches., Y2 W' D+ n% {; r! I$ u% E
auto? ;; whether or not this intersection will switch automatically.
# m( s$ \2 w0 y ?) c* i. v3 Y! H ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
: T' P4 u& }8 s8 A* F$ v; w2 g;; Setup Procedures ;; O( G7 E% {% v$ R1 w' s, Z
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;; Initialize the display by giving the global and patch variables initial values.
6 a+ C' f1 u& n9 O( u2 u/ R" p;; Create num-cars of turtles if there are enough road patches for one turtle to
6 ~( G4 T% X5 O6 Y( ?;; be created per road patch. Set up the plots.
9 L; r/ |. Y3 y, K) D5 B* yto setup1 ]" L+ [; o3 M3 q1 s4 V# e
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setup-globals" H& _# M6 O; l$ l6 O) V
$ H) v& ^( d. V1 Y8 q4 _( [5 X! [ ;; First we ask the patches to draw themselves and set up a few variables$ u. u2 D5 v `$ j- r5 e+ W; @9 B
setup-patches
, `$ [4 B' _4 `8 n- e make-current one-of intersections
& n6 K0 A1 }# C' `, h label-current
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2 a' ~2 _- ~5 a set-default-shape turtles "car"
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if (num-cars > count roads)4 ?4 i2 x3 C, {
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0 I0 }0 K$ `# H1 R% ? user-message (word "There are too many cars for the amount of "4 T, ?* @; O- P8 F S5 U
"road. Either increase the amount of roads "
7 T) B6 s2 J$ l0 H9 H. Y, L "by increasing the GRID-SIZE-X or "
4 K* Z# w2 D2 _. Z" f "GRID-SIZE-Y sliders, or decrease the "
$ L* }( I0 ?' d" i" m: g "number of cars by lowering the NUMBER slider.\n"! P/ {6 d2 s: D# S* M: Z
"The setup has stopped.")
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color3 L$ R( _% B* ]; H: I& Y% X
crt num-cars. I' O; d) F" O; j9 |! p; B
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setup-cars, J4 a% D3 |/ W, Q! w# O& ?& ~) L
set-car-color
4 y# [" m) h" x record-data
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;; give the turtles an initial speed; \& L. L0 y, j* H/ c, X+ q3 ?. [
ask turtles [ set-car-speed ]# g2 b9 R, y: n0 U
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reset-ticks
+ \3 K' @# @" P3 d' Iend
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; l1 U b6 N( K* y' h) c4 Q- [- ^" Z;; Initialize the global variables to appropriate values
+ ~6 H" h- }/ E0 |- z6 ]* kto setup-globals( w! c' ~4 ]3 e% ?. V5 u9 b
set current-light nobody ;; just for now, since there are no lights yet, i- z$ M2 B ~* x0 e* [
set phase 0
+ }2 u- p6 ~$ q1 w" Y) q2 U0 S set num-cars-stopped 0* W! X: @1 `, M' ^3 j+ M: A
set grid-x-inc world-width / grid-size-x. N5 a9 `% n2 N$ J: H3 r& S7 A8 d% x& Y
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* O4 z6 q0 k( q( c1 Z
set acceleration 0.099
- r9 b7 @1 }) u8 ^end
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, `+ _6 R; a6 X( ^4 s9 r;; Make the patches have appropriate colors, set up the roads and intersections agentsets,/ [: W. d" ^8 H F" c5 l
;; and initialize the traffic lights to one setting
% f: D! l; D6 p5 w4 u: R/ @to setup-patches6 ^) w9 {8 D' N
;; initialize the patch-owned variables and color the patches to a base-color+ a7 J) U Z$ S& @6 |
ask patches" v( |$ d/ p, G2 M* a
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# e8 @- h% l' u5 T4 a- U) C set intersection? false
( T, g9 B* k# r8 P/ U set auto? false6 z- I, T2 d4 S0 D: g9 D) o" r* ?
set green-light-up? true
& p& {! A( \6 i5 p3 L* W set my-row -1
2 R+ p1 `3 E. B; | set my-column -1
" d1 n9 k, V+ k ~: N8 ` set my-phase -1
2 s( Z, K, p5 W' H5 G5 C/ p0 N set pcolor brown + 3. |, R: @. [. S) J
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! _5 G$ d$ x' j# E3 g3 u) I ;; initialize the global variables that hold patch agentsets' N% E4 `2 N0 N6 D# {+ m, y
set roads patches with+ P9 U$ H) m$ n
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or2 V: N1 b$ d& t+ p
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]- z7 h- x% h' Q+ Q o
set intersections roads with
) k7 x9 @: f8 G! n9 j N [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
0 r: G. z8 |% R4 b8 y$ z (floor((pycor + max-pycor) mod grid-y-inc) = 0)]5 n& d$ c" m: P1 s3 a' g& F/ v
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ask roads [ set pcolor white ], T5 @- P( F: \$ b
setup-intersections
4 a1 p2 Q2 B; O& K2 fend
: {* t. N( {! S+ S/ Z8 V1 Y" H其中定义道路的句子,如下所示,是什么意思啊?
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! w/ i9 \. u- [; N$ U! S. Y' v# d [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or: [6 G5 @/ I9 Y5 ]/ f" N
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 P4 @4 z. z7 q; U2 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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