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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 ~; @) O3 j& u) Z% K' z+ ]
netlogo自带的social science--traffic grid这一例子当中,2 B- @. L/ Z/ r! I, t) h* f2 P% R
globals* }; G/ J+ g( G, M' g
[
. T8 [. @# N i' B( Z0 j grid-x-inc ;; the amount of patches in between two roads in the x direction8 H- f" j+ |. w4 N9 b
grid-y-inc ;; the amount of patches in between two roads in the y direction
$ z% D# ]" x! ^ acceleration ;; the constant that controls how much a car speeds up or slows down by if. ?1 \% M3 }2 g: O5 W! {4 S' Z
;; it is to accelerate or decelerate# K; k4 W. Z, N/ I( g2 H
phase ;; keeps track of the phase5 m( D. H$ F& g9 K
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure4 r* R6 D# t9 e0 `0 J
current-light ;; the currently selected light
0 [8 ?5 J* F! @6 b7 L- ?( y
, D6 v9 V. i( f( i3 }7 `- b ;; patch agentsets
- _/ G) c; L E2 V5 E intersections ;; agentset containing the patches that are intersections
$ d( Z/ ~' o+ ] roads ;; agentset containing the patches that are roads9 U5 ~. `- }5 a! V J) K
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+ S2 b, K3 ]7 j8 a5 x$ rturtles-own' q- U: m; C& V2 b+ _1 g
[
6 z% A$ f5 f. b: U6 l2 u speed ;; the speed of the turtle9 g' ^- w9 T, Z0 N2 [; n
up-car? ;; true if the turtle moves downwards and false if it moves to the right
+ w3 L# `; H) Q: _ wait-time ;; the amount of time since the last time a turtle has moved
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; {' e: H# J. c" j4 K0 spatches-own; A0 k9 H$ l6 _; k$ Y. O( J: U6 V
[0 G; h/ {; c1 Z. r; _
intersection? ;; true if the patch is at the intersection of two roads
+ L. K/ ?4 s$ ~6 J8 D5 C- q green-light-up? ;; true if the green light is above the intersection. otherwise, false.
$ R. o, z: c$ W1 a* Q8 I( u) h+ ]7 x ;; false for a non-intersection patches.
" n; s' ~+ h8 q a my-row ;; the row of the intersection counting from the upper left corner of the
0 x6 c4 O( u$ w3 c% a ;; world. -1 for non-intersection patches.0 W9 V) t: Y( T; Y. r) [+ r, R; K
my-column ;; the column of the intersection counting from the upper left corner of the
9 V/ N! K) o* u1 j$ ]7 A% W( o ;; world. -1 for non-intersection patches.
& w$ H9 `# `$ _- {5 @ my-phase ;; the phase for the intersection. -1 for non-intersection patches.
1 `9 D4 c3 `" C( A9 Z auto? ;; whether or not this intersection will switch automatically." a ]2 E1 p$ k
;; false for non-intersection patches.
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3 `" \1 Y' O8 q5 _! |;;;;;;;;;;;;;;;;;;;;;;
0 U' \7 N. t8 [7 ~' };; Setup Procedures ;;* F% X# H2 Z4 s' r" D
;;;;;;;;;;;;;;;;;;;;;;8 H' B! a! K X2 Y1 v( U2 S
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;; Initialize the display by giving the global and patch variables initial values.
' Y# r6 v* Q0 q5 ^;; Create num-cars of turtles if there are enough road patches for one turtle to
& n# I; i% l, k1 A;; be created per road patch. Set up the plots.$ n% z4 ^4 K# ^2 \
to setup$ M6 w( D: {2 C& r; `4 [
ca i" G- u$ i) O8 c) i2 A8 y
setup-globals% y! W) s# k1 [/ D6 F
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;; First we ask the patches to draw themselves and set up a few variables
* n! U$ P% f J setup-patches
# T* q' J+ \2 Q* s- E make-current one-of intersections+ x% [+ f: j6 J) |9 [
label-current
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set-default-shape turtles "car"
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if (num-cars > count roads), O, T/ v J- h5 Z) G- C
[4 F& r, V, B' G0 p* C0 e! F0 l2 O9 k7 `' v
user-message (word "There are too many cars for the amount of "
( c$ s9 ^) p4 r) K4 w1 a "road. Either increase the amount of roads "& Q) K9 F. Q- w6 K! y& |' e
"by increasing the GRID-SIZE-X or "
2 i7 `( |6 N8 F; [ "GRID-SIZE-Y sliders, or decrease the "
0 Q& ^+ ?3 i: e9 Z "number of cars by lowering the NUMBER slider.\n": L; I+ u+ V+ ?8 {, _1 E
"The setup has stopped.")6 W4 x: v7 S* V1 f) y
stop9 @( W4 U/ e; H% h
]
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color) A. d* r+ e# _9 F, p# t5 d4 X
crt num-cars
$ K B( Y" {% o; R/ L4 { [5 ] i; Z# G& j1 T+ b% b& o
setup-cars1 U" ^- Q& o1 [4 V4 j' y
set-car-color& M" S( D6 i; c; H4 K+ C
record-data' C @% d+ d! ^, D) |
]
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;; give the turtles an initial speed' |5 H# n, [% l; I0 Z
ask turtles [ set-car-speed ]
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P" L# j, ]' m$ t5 F2 K( r# P" w reset-ticks( C7 }1 B* n, d
end
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;; Initialize the global variables to appropriate values, v/ P, B. U1 a! P( Q
to setup-globals
8 `# Q- ]) i7 p3 ^ set current-light nobody ;; just for now, since there are no lights yet, g& {. @( m5 k# K( ]3 a
set phase 0
" d9 r, ]5 A% w set num-cars-stopped 0. \+ {" {+ a! u3 b
set grid-x-inc world-width / grid-size-x
- ^( W" H" d: u: M# _/ h 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. P' o% U! A v- `7 A set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
J F) G0 V5 _9 d;; and initialize the traffic lights to one setting
6 o$ M' k# b* kto setup-patches! C. Z2 v! n, K* R' ?% u
;; initialize the patch-owned variables and color the patches to a base-color+ J5 G. U# A6 a& P
ask patches. O4 M6 [% j& l9 H! M' u+ \
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set intersection? false
5 n5 s2 B6 N! E; [8 L( o6 g set auto? false
7 g4 M7 u$ F0 _1 g9 p set green-light-up? true
, g3 G4 D4 j7 l/ E- J- j set my-row -1
, K, i7 `% A/ V set my-column -10 e- Y9 ]' u0 y, s
set my-phase -12 S7 V( B0 q) s% ?. r& y
set pcolor brown + 38 N- P: \" @/ W6 C: t) }) B9 v8 `0 i
]
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;; initialize the global variables that hold patch agentsets
' ^* n% j1 D/ b' r set roads patches with
: j- F+ h, M! {# m( _ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
2 V1 ?& N( O. A: I* @! W* Z1 G (floor((pycor + max-pycor) mod grid-y-inc) = 0)]$ K9 w C- Q3 \# G# k
set intersections roads with( v/ {) D0 ^% O8 y; X! C* d
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and) [2 z/ n+ m2 c7 Y/ }. X2 e Y
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]# m8 v& R {; _7 m) Q, [7 l$ L9 N
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ask roads [ set pcolor white ]' J" Q* p: {6 j4 J: p2 V2 _+ c
setup-intersections) v( m8 o; Y; @" r* f9 P( J2 ^
end1 O: Q: R/ S. { }6 L% q$ b
其中定义道路的句子,如下所示,是什么意思啊?
8 |8 I- D2 E" S set roads patches with
9 s- K5 _( [( |' O/ u' d: e5 J [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or7 n9 I- d J, J/ i+ H2 j5 J
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
" m/ V$ X4 E7 E0 M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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