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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 T: t2 u8 Q6 p3 @netlogo自带的social science--traffic grid这一例子当中,( J% q/ L, h$ _1 r$ I
globals8 _9 p/ h8 K6 J( t& v: L
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8 E8 i- [1 N& Q1 F) E* \. W grid-x-inc ;; the amount of patches in between two roads in the x direction6 ^" u( E7 u& T4 |6 p) O' o
grid-y-inc ;; the amount of patches in between two roads in the y direction3 Z8 u; G% V0 ]/ ~+ |4 J7 m
acceleration ;; the constant that controls how much a car speeds up or slows down by if
2 e- [, B+ N2 y+ M& }9 h H2 j/ U ;; it is to accelerate or decelerate( u7 w% ?6 P/ P y
phase ;; keeps track of the phase
! j$ w. O: J3 q num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure; c/ H" A$ R' x9 @2 b. [# K
current-light ;; the currently selected light
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;; patch agentsets- _+ s$ X& i3 O0 j$ S
intersections ;; agentset containing the patches that are intersections$ k& e1 y6 l; E
roads ;; agentset containing the patches that are roads2 `' d( f, \/ G+ k8 W3 w9 d4 @5 l
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turtles-own& h8 T+ b; g( f- j6 I! n5 p4 W
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$ {. _7 X8 G: i# w8 U$ U' H0 I) e speed ;; the speed of the turtle
) a$ n; |" s0 ?! L) ~% z up-car? ;; true if the turtle moves downwards and false if it moves to the right! _' C/ a% A% E
wait-time ;; the amount of time since the last time a turtle has moved$ H; [- `$ V- ]+ L
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patches-own8 T( } U7 O6 D$ Y3 {' N
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- ~! b: g6 G# D* m5 K( Q intersection? ;; true if the patch is at the intersection of two roads+ k. R% d2 N! C( r: C2 ~* E
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
* O. D `* w4 Q% A! A ;; false for a non-intersection patches.) r# y: \0 U& s
my-row ;; the row of the intersection counting from the upper left corner of the+ E" K5 |# A5 c) |; l7 ]
;; world. -1 for non-intersection patches.( `% }" T3 s- V0 P7 d
my-column ;; the column of the intersection counting from the upper left corner of the
! a8 r9 \ S) [. t% |% D7 g/ z ;; world. -1 for non-intersection patches.4 g& J" P9 y3 S3 \( R
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
+ j% l: ~9 y7 h auto? ;; whether or not this intersection will switch automatically.) _; W0 L0 H" {$ x0 o% p/ G4 B
;; false for non-intersection patches.# H9 Z6 p8 u% r
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;;;;;;;;;;;;;;;;;;;;;;6 u& s' f, t' {4 C J
;; Setup Procedures ;;: t( ?7 O3 }( ?
;;;;;;;;;;;;;;;;;;;;;;
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h; I& [6 P, t& n" {;; Initialize the display by giving the global and patch variables initial values.) E: M$ z- P& T$ s( l7 U. `4 {
;; Create num-cars of turtles if there are enough road patches for one turtle to% R2 o: _( V( r( d4 l( P
;; be created per road patch. Set up the plots.4 }4 G$ n$ D$ M% {* x
to setup6 m# I7 Q$ W& d5 X
ca
6 V. A: W+ @9 J/ S) V! B- d setup-globals9 }2 J7 @! W9 o/ h. K0 M
& a8 ~& c5 v! l* ?2 S" `" G ;; First we ask the patches to draw themselves and set up a few variables" y4 U6 \/ R9 F
setup-patches
9 N" z5 ]: @, J. o$ {1 A( G7 O) h make-current one-of intersections" A7 ^; b6 A$ p+ s. K3 [; r
label-current' X& R/ Q) j% o" k% K7 U1 {7 i8 Z' j
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set-default-shape turtles "car"
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1 G5 y& m: ?. O& O/ B4 ~, g if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
C/ y8 n! e- N$ [" A! J A4 Y& p4 n "road. Either increase the amount of roads "/ d! Y! e1 _6 }) I7 U- t, i4 w
"by increasing the GRID-SIZE-X or "5 S4 p' a6 C9 B7 G) ]
"GRID-SIZE-Y sliders, or decrease the "
! Y5 H! b5 E1 N% q" ]6 B "number of cars by lowering the NUMBER slider.\n"
6 t9 |9 m, A9 B1 i4 l9 r) E "The setup has stopped.")% Z- }8 W& {# j. h# u
stop/ u8 [9 ?0 F o+ c- ?
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color5 h, ?+ E, }5 S9 J9 i
crt num-cars
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setup-cars8 u1 v d9 p% a# z; G5 L6 L
set-car-color
; n$ x6 |* d' Y% C+ } record-data2 K* H9 Z: c$ h% z/ `9 y+ m
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( y% W9 C# w4 b7 O7 ^. o) U- Z ;; give the turtles an initial speed, a* {2 r0 L! P
ask turtles [ set-car-speed ]
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' H3 }6 t. R& W/ k/ J( Q9 h reset-ticks
7 M5 ~8 b2 x" H u- t$ P Vend
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;; Initialize the global variables to appropriate values
C% y/ G! r1 e) e" j* {- rto setup-globals% D$ E9 r2 g4 F& F H0 @
set current-light nobody ;; just for now, since there are no lights yet
# B: T; U: e% U- J8 p set phase 07 o+ ~: n$ O O. X! Q# ]/ p `
set num-cars-stopped 00 Z3 |# _- x, o/ O+ Q, O @: a* a
set grid-x-inc world-width / grid-size-x! H* v' j1 Y, P2 r
set grid-y-inc world-height / grid-size-y' O" N* K5 t: {2 n) ?
* \. j o- j. d- X# \ ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary, R( d2 }+ C4 P; R, F3 h5 T
set acceleration 0.099* _9 A4 u! v I4 `. @/ [
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,1 B1 Y! `- n4 h1 ^ l& W( B
;; and initialize the traffic lights to one setting) Z3 Z1 D8 X, u$ ?7 j; g
to setup-patches7 Z1 B4 o# L% C* v% f
;; initialize the patch-owned variables and color the patches to a base-color
# ~8 R+ h) j6 S& Q0 v9 L& N ask patches1 c6 L4 ~1 w& H! J! x: [& O0 `( f5 x
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& f% J, F7 X9 J8 b: H set intersection? false
! t- ~: R+ g0 M) q" R/ \: Y set auto? false' p$ Y3 Q, R: O; P- f0 R' C
set green-light-up? true7 `6 N) G4 N8 C. K
set my-row -1+ l& R) q" D/ \4 s& V2 F: n; E
set my-column -12 j+ o! F$ r3 N- t4 T9 d* M
set my-phase -1
* B4 p: P! u% q0 ?% T% y set pcolor brown + 3+ Y) K6 Q1 u- I& [3 g) W& E
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;; initialize the global variables that hold patch agentsets
! {8 J1 I, E1 H3 s/ Q& S- N set roads patches with
; C d5 t; C& ]( h8 u5 o$ I [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or: q" u+ w6 b. ~$ Y% r$ c2 |- O
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
% n5 F d" f1 f/ | set intersections roads with4 C% o, V% f8 ?% ] _* Z$ J g% k
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and9 S3 k d3 H! a5 U
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]+ Q$ N/ D' \- M( Z& V! v$ g- K
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?
8 D) I( {8 }+ q! t) h& I- O set roads patches with8 c4 Z8 G% w6 l( ~5 l T4 A% z% C
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or' j% P' F* m8 [ |( d- F0 l6 M$ l
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
5 F6 K3 k( P' n( c$ ^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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