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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。8 p2 l/ h9 e- ~9 X- B3 E: A6 x2 j3 s4 l% Q
netlogo自带的social science--traffic grid这一例子当中,
" ]) l4 ]! i o: p8 aglobals. ~0 [' i4 @# d, F+ p: ~
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5 W3 l( c* D/ Q5 ?' D9 b7 @ grid-x-inc ;; the amount of patches in between two roads in the x direction
( }0 {, P" D5 {2 ] grid-y-inc ;; the amount of patches in between two roads in the y direction+ m3 O8 z; f; r. u# }! U
acceleration ;; the constant that controls how much a car speeds up or slows down by if% R9 W z# t5 Y" f
;; it is to accelerate or decelerate
) P- j+ s4 {1 [- B8 v phase ;; keeps track of the phase
4 e9 l4 V2 Q4 r3 h: o num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure- N$ c4 S: v& e9 g! w
current-light ;; the currently selected light# S+ K5 C+ d( T6 y
, m8 j" f Y$ x# ?- }8 y Y
;; patch agentsets
# Y! G$ S8 H* v6 B& r" I! z intersections ;; agentset containing the patches that are intersections5 c/ l6 y2 V9 T) _ J
roads ;; agentset containing the patches that are roads2 }3 ]. `4 ]' |" ?- w3 g
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turtles-own- O2 w( }, R) T5 Z& Q1 G
[
7 m0 S1 e6 U b$ e, ] speed ;; the speed of the turtle
6 i7 B: M& ?! v; r up-car? ;; true if the turtle moves downwards and false if it moves to the right% L$ D0 ^ W' y. a$ ~
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own L8 [, f5 G% z3 _/ `
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' U$ f8 y' G3 X! h- E) b, u intersection? ;; true if the patch is at the intersection of two roads& V9 H+ U9 T3 @" P, \9 X4 V* e
green-light-up? ;; true if the green light is above the intersection. otherwise, false.; N) V4 r; }) }, X7 O( i
;; false for a non-intersection patches.
) i1 J& J2 {2 P6 `9 m |4 p& c- V my-row ;; the row of the intersection counting from the upper left corner of the
( t8 E: q- C: ?1 }( _ ;; world. -1 for non-intersection patches.
4 Y; F0 I" o3 p/ T/ ]4 v2 O# ?4 x1 { my-column ;; the column of the intersection counting from the upper left corner of the- F; {3 S3 F, j6 j9 A* F3 S
;; world. -1 for non-intersection patches." s& ?7 w, f2 Y( T0 Q
my-phase ;; the phase for the intersection. -1 for non-intersection patches.; D/ E: \, m4 e- l: w
auto? ;; whether or not this intersection will switch automatically.
$ a% g; k: v, G ;; false for non-intersection patches./ t+ S+ \; h/ G/ s. |
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3 u* Q8 G& k4 H;;;;;;;;;;;;;;;;;;;;;;* Y W3 |! y% U- Z
;; Setup Procedures ;;
7 R( K* W! b" P7 I: r4 Z ^+ T" g( N;;;;;;;;;;;;;;;;;;;;;;' x$ b" M3 H, p5 R# Z) Z
q; }( a. J. ]8 _$ G6 n2 _* J, L;; Initialize the display by giving the global and patch variables initial values.
- w- e/ e6 H6 [* ^* d/ l;; Create num-cars of turtles if there are enough road patches for one turtle to. M2 {) B' H& e1 u( {. j
;; be created per road patch. Set up the plots.- M' _" N) l, V7 W) C' Y# Q$ ~
to setup6 L9 Q% |8 i+ {8 C! M/ X! `
ca
, Z. O8 W# v6 H8 q C3 o0 O; r% m setup-globals
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;; First we ask the patches to draw themselves and set up a few variables
0 I# x1 k) o1 {( t9 A+ Z setup-patches T+ e1 | W# h8 j
make-current one-of intersections/ g' s' u" Q' O5 u Z O
label-current
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1 X# ~. T0 k- L. c! h# t set-default-shape turtles "car"
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2 {, n0 t( U, J+ b. i- a' m9 w if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
/ Y/ d- N. T# M: O "road. Either increase the amount of roads "
; H8 o0 q* Z) x& \ "by increasing the GRID-SIZE-X or "
2 E9 V" Z2 B+ p, E: v% [' P. }' |% | "GRID-SIZE-Y sliders, or decrease the "
* P! Y3 T& Y+ J6 q. z "number of cars by lowering the NUMBER slider.\n"
+ P1 c# e: T7 w/ w5 m "The setup has stopped.")7 R6 o$ R# c# D
stop- g! `0 }9 W- E4 I0 n N
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
5 \% `* D$ I F7 e: O crt num-cars" A% n* s# ^" k3 r5 X
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, l! b2 L0 E/ n6 `1 v5 ~- E setup-cars
) g: C# p7 P) y. O# w/ d% W set-car-color
5 j: R8 Y( `% O6 h1 K record-data7 D/ _9 {& p9 M
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+ N c5 Q3 y3 E2 ]* M' v2 n ;; give the turtles an initial speed. D- O ]3 t3 E
ask turtles [ set-car-speed ]
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reset-ticks
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" `) ^% L0 q7 o6 u;; Initialize the global variables to appropriate values* h. X8 b' y' t- n
to setup-globals3 o4 d' K- G% M+ {, x
set current-light nobody ;; just for now, since there are no lights yet
$ u! Z% [( Q2 w. {# [* W2 S set phase 0* B' o1 _. j t% D8 T. l9 |
set num-cars-stopped 02 X {; T' e- Z8 y7 f, z% e
set grid-x-inc world-width / grid-size-x7 C* {& O+ }$ y' Z8 S
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
. R: j' ~; Y0 v/ b( w/ \8 t set acceleration 0.099 s; O2 I0 _$ N
end- |7 H8 _. Y" d
9 o& F1 y2 G) j/ F" f: Q6 K;; Make the patches have appropriate colors, set up the roads and intersections agentsets,% m0 e0 S9 M& H" {6 d
;; and initialize the traffic lights to one setting
" p1 d; x9 G: A- b1 B0 E6 L4 W5 P- `to setup-patches
1 r/ ] J9 O( d ]/ C' e ;; initialize the patch-owned variables and color the patches to a base-color; F+ Z; Q1 Z: v ?
ask patches/ |: F( v5 n) ^0 E
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set intersection? false
: ~$ w7 ^& ~0 J0 f6 B6 S7 b2 `% w1 x% w set auto? false+ @0 ]6 A3 c8 A7 p
set green-light-up? true, w8 }% I3 l) j: b( r& Z0 [, |% |
set my-row -1
8 D9 A4 d" F5 x set my-column -1/ |% ~+ W0 l' W
set my-phase -16 ] _5 Q2 P4 a. ~! q- d
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets' }* s' o I; T4 [, g
set roads patches with
6 a% B { _+ t4 D [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
8 U5 z1 S% Z" v (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
8 L, K% B( }; t/ a" Z& [ set intersections roads with
5 I" H. P L6 }: B; x8 I f5 y [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
3 K! p/ I% s3 n; d# r" l- Y (floor((pycor + max-pycor) mod grid-y-inc) = 0)]' d! J U! H7 n8 K$ F8 k2 Z% M
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ask roads [ set pcolor white ]" \1 v0 I, _' R5 u
setup-intersections
5 ]0 A. I7 w! N* t, C6 W5 _end
1 E; H9 ?1 M! r; C. L1 L6 {4 ~! o其中定义道路的句子,如下所示,是什么意思啊?" B& z5 j, p/ J) A, r
set roads patches with9 Y. F5 P' y% F- _) `. ]7 l
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or8 J) [* ^, |0 p. S
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
! J% @7 s, I- X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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