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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。
( T& z6 m' y' M; d4 Jnetlogo自带的social science--traffic grid这一例子当中,
+ W1 S; i% m m/ a6 A( u1 X% H, Cglobals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
% d* ?1 n' M$ D; I1 ~% j; r grid-y-inc ;; the amount of patches in between two roads in the y direction
/ R$ R- g! _% p! F4 K$ F) q4 g acceleration ;; the constant that controls how much a car speeds up or slows down by if- u" K4 E! ~4 f0 ]) ~
;; it is to accelerate or decelerate/ z, z, n z$ D* z0 ^, O8 e
phase ;; keeps track of the phase$ g6 X( E/ b" [- ~2 M5 R
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
' n9 m- y9 T, y5 @) O3 } current-light ;; the currently selected light' f1 u; m" s+ c6 i c
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;; patch agentsets# F& Y$ n* @8 u& H! n9 o
intersections ;; agentset containing the patches that are intersections
3 D! I( a5 t! q4 N' F5 U% M roads ;; agentset containing the patches that are roads Y! |; O1 c) b/ p1 S, R, }* v
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turtles-own
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speed ;; the speed of the turtle
- G3 L" `, x9 G$ J$ k& d up-car? ;; true if the turtle moves downwards and false if it moves to the right
5 M9 t' ^! D$ }9 a wait-time ;; the amount of time since the last time a turtle has moved
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: m8 d& m' P' apatches-own
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intersection? ;; true if the patch is at the intersection of two roads
( i, Q2 ^ V3 N. e+ _7 X green-light-up? ;; true if the green light is above the intersection. otherwise, false.
& n( Q$ L$ t/ p& A! w; G% r% ] ;; false for a non-intersection patches.
3 h5 H! v! u9 E$ Z7 _+ H: g0 o my-row ;; the row of the intersection counting from the upper left corner of the
1 Z. f9 F) \8 n u2 R, m ;; world. -1 for non-intersection patches.0 m, V% r1 Y( o" k- X6 D% f
my-column ;; the column of the intersection counting from the upper left corner of the
K1 \0 Q3 z! a' t9 H ;; world. -1 for non-intersection patches.8 c# ^; O" ]* {/ @$ s6 o$ g n
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
n+ x0 H: b+ M- ?! q3 `# O+ M auto? ;; whether or not this intersection will switch automatically.: W3 `. n8 M L! V8 f: N
;; false for non-intersection patches.5 i/ o5 \/ B: o7 N3 s U
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7 j5 J) u5 _. N F1 |( ]$ [* }& m;;;;;;;;;;;;;;;;;;;;;;/ |8 v5 D7 T( h9 ]1 u: M, z
;; Setup Procedures ;;* M3 }+ i) `7 l5 I9 C/ B, Z' v
;;;;;;;;;;;;;;;;;;;;;;% k3 d# F9 U3 K/ B6 i0 [4 R
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;; Initialize the display by giving the global and patch variables initial values.+ I V4 _# {* t; o# Y; s2 A6 @ N
;; Create num-cars of turtles if there are enough road patches for one turtle to
; V4 |7 ^$ y6 M# B/ f;; be created per road patch. Set up the plots. H, n0 a9 H9 W8 n& m V# L: E
to setup
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5 n7 l% U, O) O$ o/ t setup-globals
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;; First we ask the patches to draw themselves and set up a few variables q% {3 t# v J/ p) R. s
setup-patches
9 [: N. ~- t1 }' }8 D make-current one-of intersections
. k S3 B. D3 j3 y5 ^ label-current
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$ |1 K8 k/ x% @# g! C. x: g! } set-default-shape turtles "car"
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: C, Q* M: k, \( x if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
9 S _/ {* R: w/ W6 w1 ~1 L s- Q m "road. Either increase the amount of roads "6 j7 i5 {& Q% m$ Z
"by increasing the GRID-SIZE-X or "
9 r; S- z, V. _: D. B) Q9 Z "GRID-SIZE-Y sliders, or decrease the "" F. x% ~7 D7 q* I2 N
"number of cars by lowering the NUMBER slider.\n"
8 T9 u/ j' L9 t$ S' W "The setup has stopped.")
3 L5 }, Q$ y( a9 ` stop
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* d/ V$ N( a1 m/ x9 K5 p+ S+ c# r ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
) t; J4 R4 [% E, p; X' k crt num-cars9 `5 E7 s9 r- Q8 e8 F9 n
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setup-cars$ t8 B9 o0 ?2 U0 o& Q: k
set-car-color. Z0 I2 s( }# x) f) _
record-data# h$ m% u1 C& [2 g9 }. L* S+ t
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8 w# m6 j4 M& \1 I( O2 o, p- g+ Z ;; give the turtles an initial speed+ C0 z! f+ d: ~; x" L3 ~" C) h! c9 L: o; |
ask turtles [ set-car-speed ]
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reset-ticks4 O" v8 B+ F8 }9 u$ h+ f
end
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;; Initialize the global variables to appropriate values- d1 h& O e K: F7 T* F+ X
to setup-globals
+ p2 o4 O/ Q+ Y( } set current-light nobody ;; just for now, since there are no lights yet
/ y4 e6 M2 ?2 e+ Y: q6 t7 L set phase 0
8 ^" c6 Q0 x" L# U4 w# Z" u set num-cars-stopped 0. I! p" ]8 J6 c& k9 t
set grid-x-inc world-width / grid-size-x/ `& U1 ?- X7 x5 T8 i" v/ \2 q
set grid-y-inc world-height / grid-size-y
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' d* H# \, P2 t ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
' y& a$ t' K: p1 E set acceleration 0.099
1 _ z( L8 }6 D/ O l9 Gend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,& d" d1 w1 ?1 ^! ?5 m! H
;; and initialize the traffic lights to one setting
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;; initialize the patch-owned variables and color the patches to a base-color
6 O+ \; ^" X8 Q) g# b' m ask patches
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, e- `; R N, O7 m# U3 E, h set intersection? false$ P6 M4 i8 o0 B$ e" E* n! x: c
set auto? false
( M8 {* I& ^/ u2 i& Z2 g set green-light-up? true
1 k3 ~7 |, u' C) Z0 }' P, ` set my-row -17 x/ |' T( v& W# i
set my-column -19 S2 |9 f& e7 R& W! n
set my-phase -1
, o# P% Q5 U3 f1 D set pcolor brown + 3. r! G% ~6 A2 I% h
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;; initialize the global variables that hold patch agentsets
8 h: ~2 u! a% j* x1 | set roads patches with
) k2 {" t5 o4 j* b9 b) W+ o [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or1 U4 w) `3 E6 {: Y8 y" N4 ?( v
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
, F1 H0 a6 C; ? J& a+ y5 M( H4 x set intersections roads with
9 Y2 v% G- G- j& a" Q; P [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
+ c6 h: T+ S" ?5 t (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
4 V9 h7 p( H6 V 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?+ a* n+ c" S% _6 o9 G' f$ r+ `
set roads patches with' N4 V2 v/ J1 x# P5 Y7 {5 k- d( @
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
5 m/ ?, C) Q. E; H. Y' x: o (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
5 {! |8 n! v4 o: J8 C0 J& p1 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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