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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。+ r. m3 ]' ]# J+ b. u( C; t
netlogo自带的social science--traffic grid这一例子当中,
# l- b4 {' \7 W* o( |4 i- {globals8 ^5 E; ?/ S) \
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grid-x-inc ;; the amount of patches in between two roads in the x direction
/ ^$ n; o9 X! C+ K grid-y-inc ;; the amount of patches in between two roads in the y direction( B1 R7 \3 d: S; h% I( W
acceleration ;; the constant that controls how much a car speeds up or slows down by if2 T* k6 s( r4 _5 l* V
;; it is to accelerate or decelerate5 w9 ?& B/ i& A/ ~! |
phase ;; keeps track of the phase; }; ^# Z% _ f+ Z
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure" x" l5 j/ L( R0 z% D) E
current-light ;; the currently selected light0 u( J8 B! s b$ K8 l6 j" `: z" i
5 `% ?6 w x' b: e4 m/ y: D I ;; patch agentsets: B( ]* y W. p; `2 K6 K& M
intersections ;; agentset containing the patches that are intersections
# O+ Q5 C- c c5 Y0 s roads ;; agentset containing the patches that are roads
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6 a# t# I9 Z& @4 s; Y& l. Hturtles-own( ]! {4 ~% l! ?: q
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speed ;; the speed of the turtle
% e7 q: c9 e( _+ f6 ?0 ` up-car? ;; true if the turtle moves downwards and false if it moves to the right
# f7 v, n5 L% H" O- p! r wait-time ;; the amount of time since the last time a turtle has moved
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& b9 _ ^7 X0 z; e* |7 y4 {2 lpatches-own/ w2 V0 a0 x5 J i
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intersection? ;; true if the patch is at the intersection of two roads2 ~' w# S, c% p- T: Y
green-light-up? ;; true if the green light is above the intersection. otherwise, false. M9 i* d2 ~* Z% |9 c
;; false for a non-intersection patches.% m* t: q& h" T4 k- D6 i2 q. w
my-row ;; the row of the intersection counting from the upper left corner of the- M+ r& ?/ [. K2 [
;; world. -1 for non-intersection patches.
7 G' \, ]0 T8 G my-column ;; the column of the intersection counting from the upper left corner of the; v7 a' L. N3 H/ _
;; world. -1 for non-intersection patches.
) F5 M a5 _' X! u0 ]2 T; E/ A my-phase ;; the phase for the intersection. -1 for non-intersection patches.
; r6 K ~! O& I1 y auto? ;; whether or not this intersection will switch automatically.
( P, O% F; }6 k# N1 O2 E+ J ;; false for non-intersection patches.: _2 o9 Z' p1 d, @8 @9 N) C# Y
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9 E& V( Q: z& r( M. Y;;;;;;;;;;;;;;;;;;;;;;! e* T! d+ R8 N5 {( B8 x- |
;; Setup Procedures ;;
- s V$ E/ \8 b# X;;;;;;;;;;;;;;;;;;;;;;
9 S; E) u' d( @% T& ` C2 C G2 W: S
0 Z4 `9 p+ l* t l( K+ ?;; Initialize the display by giving the global and patch variables initial values.
. l7 J( Q4 Y: A8 q8 \* W# J2 g) s5 g;; Create num-cars of turtles if there are enough road patches for one turtle to
+ T' Z+ v2 l0 a* e) z+ Y;; be created per road patch. Set up the plots.$ h# a1 v& S9 m% C! V& s
to setup
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* [* n6 Z7 o2 ?5 h; _2 @ setup-globals
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;; First we ask the patches to draw themselves and set up a few variables; {: C! N* k: C+ a# ]
setup-patches
; \% s" X- Z. Z3 N make-current one-of intersections
! }6 L3 r% O1 X6 e2 g label-current. P4 f8 x3 S' ?4 q$ j: y* \6 h
% h) i! Y: f5 D set-default-shape turtles "car" Q6 A' x; S, c$ l# ]% R
8 }* M+ ~) s% f: g! E& o2 C3 c if (num-cars > count roads)9 R7 [& T' Z0 V }& E
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user-message (word "There are too many cars for the amount of "8 E8 a y$ l% i! X% c/ d6 s
"road. Either increase the amount of roads "* C$ z9 X6 t5 D$ z
"by increasing the GRID-SIZE-X or "
8 h: @) O! W1 n, R0 Y9 ?' x "GRID-SIZE-Y sliders, or decrease the "
6 ~6 }8 m, H( L5 U5 l1 R- H "number of cars by lowering the NUMBER slider.\n"
0 }# `' }9 l' c7 a6 D5 s "The setup has stopped.")
( S0 S5 c5 t! T2 J+ ?4 o stop
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" k: S- ]/ k# Z/ n6 S ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color9 q, |" U+ x: @& C- H
crt num-cars' F) O& U' e" T) F9 o5 B
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setup-cars! z" V0 J D, {) y; {
set-car-color
3 |' [' Q4 g0 V2 {0 |3 k: m- V record-data. I% m z7 p& J
]
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/ s0 H6 a- q$ u% A! A3 B. E' [5 |3 _. O ;; give the turtles an initial speed0 B" c# Y# |. K! D! `
ask turtles [ set-car-speed ]
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reset-ticks7 s/ P% y9 R9 X3 t
end' l: e$ F5 m; ~! U0 @ _
/ z$ N6 D( q% \5 l, m" y# h;; Initialize the global variables to appropriate values
. s3 Y! O! N3 nto setup-globals
Y# ?4 D9 D1 `, G3 H set current-light nobody ;; just for now, since there are no lights yet
$ ], `6 E8 _; {. g6 k1 D2 Z set phase 05 n4 K4 q! a; a1 T$ _% C
set num-cars-stopped 0" I2 Q/ g2 a/ y: G! r- {+ m
set grid-x-inc world-width / grid-size-x
( E3 ?& [% l! C0 ~# y# E0 T3 Q2 ^; N set grid-y-inc world-height / grid-size-y2 S, E" C, w9 y7 O
& v' R- u# M' ~$ ^
;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
8 s |5 [! A$ {8 @7 |$ | set acceleration 0.099
8 N3 E4 n" a5 M0 X9 \end' I) S$ ?3 D9 I5 d
8 f( a- j7 N2 r5 @' k;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
9 d0 F1 c2 w/ h5 n6 \9 e8 C# B4 r;; and initialize the traffic lights to one setting& }6 @. a, i8 Z7 H7 ]
to setup-patches
3 B: Q Q! ?. k; m ;; initialize the patch-owned variables and color the patches to a base-color, j# N4 i f6 G
ask patches
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set intersection? false
4 J/ M5 s$ z! d- E$ P set auto? false3 S$ E, N* k2 I/ |- v
set green-light-up? true9 J6 a4 Q- N2 @+ o0 O0 ]+ Q8 Y
set my-row -1
# u+ v7 W3 q6 I5 z& `" S set my-column -1
% \$ A7 K. E" J2 d( V2 S set my-phase -12 ?- `, \9 I0 _7 I/ s
set pcolor brown + 37 E9 A; E3 {8 O; Y
]
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;; initialize the global variables that hold patch agentsets+ ^4 ~: G/ o( O) l
set roads patches with
* {1 H; p5 O9 N$ {3 Z0 J [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
9 u5 k) Q3 b/ e5 I( F9 j (floor((pycor + max-pycor) mod grid-y-inc) = 0)]9 l0 _. R+ s9 j% u% ]; M
set intersections roads with
9 S/ }6 ]3 T& m8 y2 C [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
6 p( [" G% j: m, P (floor((pycor + max-pycor) mod grid-y-inc) = 0)]! s+ g2 s# F9 I; ^( t m5 _+ m8 F
4 b$ s p( o3 A4 B0 r7 O ask roads [ set pcolor white ]
9 ^* v; I+ h( E4 R/ y/ [ setup-intersections1 q3 O- e9 l) i( M" W1 v& ^ Q
end
; f+ s' [7 B: Z% B4 [8 x& C4 r其中定义道路的句子,如下所示,是什么意思啊?: z. b& U2 I7 v. C3 o! ?0 M3 M
set roads patches with
$ E. [7 ^0 k7 }4 p, _ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or% ~$ t" \" H0 z
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
2 R4 G+ g- Y w9 A8 T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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