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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。$ b) f, y$ {0 k+ K" p4 x
netlogo自带的social science--traffic grid这一例子当中,0 T; x% y% c6 X2 d
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction% ]# T: }1 X' C; e& w
grid-y-inc ;; the amount of patches in between two roads in the y direction
: }, S* |# q& f acceleration ;; the constant that controls how much a car speeds up or slows down by if
( ?3 O* v7 I" R" Q# V$ G% u ;; it is to accelerate or decelerate0 l9 b4 j: p" {7 A( ~+ X) }2 [1 O6 p+ L
phase ;; keeps track of the phase. | J7 ~) X' Q; u+ q. U% B! p
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure% r: K5 H, F. _% x1 l. i# x
current-light ;; the currently selected light
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;; patch agentsets1 ?- i, M9 c0 h* t e2 K8 t9 G
intersections ;; agentset containing the patches that are intersections
: B( b. j, x& Y* |, t5 _* ^+ } roads ;; agentset containing the patches that are roads
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0 M3 r) E& A; J6 _turtles-own! D. D9 v5 W, M B' h. @ I
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speed ;; the speed of the turtle- g( V7 c' d) c
up-car? ;; true if the turtle moves downwards and false if it moves to the right
! g. B( W8 K* A8 s9 u3 Y$ s wait-time ;; the amount of time since the last time a turtle has moved x. Q! ? e6 t) t* ]8 J4 O
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patches-own, Y/ g- R# F- N' y8 m4 k
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intersection? ;; true if the patch is at the intersection of two roads
1 h t7 Q- _& X" x green-light-up? ;; true if the green light is above the intersection. otherwise, false.
: \) X; s3 S; l, [ ;; false for a non-intersection patches.
: u9 ?& G% `' D7 N' W8 p* Z my-row ;; the row of the intersection counting from the upper left corner of the( F: d0 ^- R! ?; c( x: y
;; world. -1 for non-intersection patches.. Q e0 P7 W+ S+ f# m
my-column ;; the column of the intersection counting from the upper left corner of the* ?3 k+ S \+ Z- O/ |; r6 R* ^
;; world. -1 for non-intersection patches.. c- \& R: @) X d! d6 I' Y
my-phase ;; the phase for the intersection. -1 for non-intersection patches.) k" ~3 f% S7 [
auto? ;; whether or not this intersection will switch automatically.* S# q9 b4 ^" U
;; false for non-intersection patches.+ K( s! d- ?# G, L
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8 l" |6 W( x. D& h$ S6 ~;;;;;;;;;;;;;;;;;;;;;;% D, }. z- s0 M3 U! I
;; Setup Procedures ;;
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;; Initialize the display by giving the global and patch variables initial values.
0 X! U: z3 B8 Y( m Q2 v. Q. g;; Create num-cars of turtles if there are enough road patches for one turtle to
+ z) m; y& E5 U/ h. h0 V. O;; be created per road patch. Set up the plots.7 k' F7 C5 f* s
to setup9 V2 C. r! Y3 t0 c+ }$ E& }' @
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables! m$ X2 o. j1 \( `# r" ]. J! E. e
setup-patches
* y% n5 B$ h! n. c* R make-current one-of intersections' ]3 s: w6 p2 O5 h0 V5 ?
label-current
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set-default-shape turtles "car"
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if (num-cars > count roads)0 z2 B* Q3 W5 F. Y8 x
[
8 s: ` `5 l( L% a6 s user-message (word "There are too many cars for the amount of "
* |! s0 U- ]7 y" e& z "road. Either increase the amount of roads "
) e! _$ Q9 D9 F "by increasing the GRID-SIZE-X or "
* |/ t; Y. [4 s$ ~# P; O "GRID-SIZE-Y sliders, or decrease the "
. m9 _/ n- i8 f "number of cars by lowering the NUMBER slider.\n"
! P8 l+ W) R' \ ]# }# U "The setup has stopped.")/ c/ b# ]& Y0 w- w l. L
stop
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! y) Y8 B# G4 o {9 W8 |* ` ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
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& K) O6 U' n% b5 u set-car-color9 D4 z$ D+ F0 ?* U1 a1 Z7 D% z) D
record-data
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;; give the turtles an initial speed
1 o7 m( w1 E3 y2 n8 L8 ]" I ask turtles [ set-car-speed ]. t5 P- E' T* R; r
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reset-ticks; ]4 {4 y1 ?1 B3 A. c7 m4 ]
end
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;; Initialize the global variables to appropriate values
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set current-light nobody ;; just for now, since there are no lights yet+ r: z9 @, f8 ~ @, x* R0 z0 q
set phase 0' K% _) b- [' `: U- }! f# r
set num-cars-stopped 07 d; p$ \. z1 @) v! P3 Y
set grid-x-inc world-width / grid-size-x+ h5 \* n+ `' s: d) a2 f
set grid-y-inc world-height / grid-size-y$ M; K1 l) }8 f- b! q" c8 [
H! X" i3 q; l& v ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
# h4 `5 B5 o6 f" U- q+ P8 ~4 o set acceleration 0.099
/ o4 l _1 U6 d, q1 q) hend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
1 z* @# s7 t5 x- y2 J- T. k;; and initialize the traffic lights to one setting9 v1 e8 E) o' V
to setup-patches; K3 O! [( k7 }' a E
;; initialize the patch-owned variables and color the patches to a base-color
! ~) }7 `+ u u5 q9 D* Y1 A ask patches+ J' N# x- r" J! x5 G
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set intersection? false
- u7 S* s, F# b set auto? false
+ B8 D( d4 O+ [: s( I; k set green-light-up? true
2 T7 X* G8 G* j, J0 K! k set my-row -1
5 Q3 v2 F$ N# z) Z set my-column -1
I+ E8 | P/ F0 n3 R set my-phase -1
% j2 [( d4 a3 r; L2 c( r set pcolor brown + 3( Y( n K' q8 V; j) c
]
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; @ Q' J& Z! y( I" c ;; initialize the global variables that hold patch agentsets; P7 s* Q$ U, H+ I9 e8 M2 W' @7 m
set roads patches with
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(floor((pycor + max-pycor) mod grid-y-inc) = 0)]6 c4 {* \$ j ~7 h E
set intersections roads with
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(floor((pycor + max-pycor) mod grid-y-inc) = 0)]. C; y* p M0 J; m! e4 B* P
5 c6 i5 b* x3 i ask roads [ set pcolor white ]
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end
6 b0 p) K- U9 K- Q; d其中定义道路的句子,如下所示,是什么意思啊?! Q2 u7 a. |) F( O, f/ t# H
set roads patches with$ I+ c5 R M+ s/ h0 b
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or: c- M! z2 z5 n% V, S
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]8 l' w }% a# D' U& A+ V& K1 J
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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