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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。
3 k6 Z* }0 r" M" ` D- u* m3 B% t- Wnetlogo自带的social science--traffic grid这一例子当中, U u; W1 F# ~* I7 T2 x) s' z
globals9 n6 `$ l- u* E3 S; R7 O/ P2 N
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grid-x-inc ;; the amount of patches in between two roads in the x direction8 w+ Z6 j# q) ~% K, R8 ^, e: l1 D5 L
grid-y-inc ;; the amount of patches in between two roads in the y direction
/ J$ Q$ X+ ]! M1 z F) x acceleration ;; the constant that controls how much a car speeds up or slows down by if7 F7 R3 F, t. z
;; it is to accelerate or decelerate
: z% n5 `& G; P0 L+ s phase ;; keeps track of the phase1 t/ g8 n' J7 z/ _4 [
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure* D6 n# {/ o9 F% N' d
current-light ;; the currently selected light
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;; patch agentsets
! Z1 G; @. _4 n" t6 n3 V5 i E* v9 S intersections ;; agentset containing the patches that are intersections
4 I9 Q8 ~: A: U' ` roads ;; agentset containing the patches that are roads
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turtles-own- m, d- h4 L, C+ s9 I* r
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speed ;; the speed of the turtle8 r+ [" E6 r) z, v3 E/ v; W
up-car? ;; true if the turtle moves downwards and false if it moves to the right
( C' j$ I B S& k9 U wait-time ;; the amount of time since the last time a turtle has moved3 R, T3 w. Q: G3 i0 V
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1 F2 j% Y* T" q+ @patches-own; {0 n$ A1 v) Z8 e/ f% h
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intersection? ;; true if the patch is at the intersection of two roads- e: J$ Q$ m; R5 a. S- P% J: k3 Z
green-light-up? ;; true if the green light is above the intersection. otherwise, false., G' U0 H# {2 h) }/ H4 I1 i6 `. V
;; false for a non-intersection patches.
, F6 d: ]6 k7 y: X* \ r5 S my-row ;; the row of the intersection counting from the upper left corner of the3 x1 F( r% w- x+ N- Y& X/ h2 f
;; world. -1 for non-intersection patches.1 h% m) @7 q7 n! j
my-column ;; the column of the intersection counting from the upper left corner of the
9 _) m5 R2 u; ]- B. [ ;; world. -1 for non-intersection patches.: L0 Q$ I- @' k/ t- e- j7 b) d
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
. E& p+ f0 o! ?8 J auto? ;; whether or not this intersection will switch automatically.) k6 D7 V1 j3 A( i' ^
;; false for non-intersection patches.+ ^/ U3 |( S5 @: d
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) }! H% V7 ?4 T% V; T;;;;;;;;;;;;;;;;;;;;;;2 W6 V& p0 x+ k4 N# T1 d7 i; T) a
;; Setup Procedures ;;3 {: p# |# G- u/ ^) x6 X, t M! n8 ?; u
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;; Initialize the display by giving the global and patch variables initial values.8 E/ ~; P2 Q7 w- k( }8 a/ z4 {% I
;; Create num-cars of turtles if there are enough road patches for one turtle to- j1 p b/ {* y1 @- |
;; be created per road patch. Set up the plots.
' t. H9 g9 j) r Mto setup W5 |, B# i. R
ca$ {: y' s% F5 ~8 v! k+ J( W2 \9 l: [
setup-globals
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+ X8 {: [* w1 U+ r0 V ;; First we ask the patches to draw themselves and set up a few variables! ~ H$ @" c) a+ s/ @
setup-patches: M2 |# ~: t* E* i& s3 j+ y
make-current one-of intersections5 q$ w: j' M( V2 Y7 U, g
label-current3 |' i5 @. E5 |, p: V* k% V
8 |2 w* y3 _7 j3 g5 y set-default-shape turtles "car"" i. h- C2 X- o# x8 n/ H5 B2 y
6 ?' e& \, D( f$ Q if (num-cars > count roads)4 |0 {( Z8 s( H8 K% v
[
. D3 o0 j4 F- B- S user-message (word "There are too many cars for the amount of "! s8 F$ ~# G, p
"road. Either increase the amount of roads "4 ]5 M5 F0 ~; K5 U3 y, [# x e
"by increasing the GRID-SIZE-X or "
- C* J3 W& f5 T$ s1 d+ ` "GRID-SIZE-Y sliders, or decrease the ") w' c, k$ X8 _1 O" k" H1 N+ S
"number of cars by lowering the NUMBER slider.\n"$ i8 T% V" P$ T/ J( B: {3 {& @ L
"The setup has stopped.")4 |* O# n1 o/ _! U9 z" L
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color7 p" x: L! s! [+ b& x; `
crt num-cars
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setup-cars
$ k; |8 Q0 J( e0 B. Y set-car-color* u6 _4 a9 N: X4 ~5 d
record-data+ p0 Z) v- R3 z
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3 S7 e5 ^3 ^1 F- H" p1 Z! ? ;; give the turtles an initial speed
8 B9 _7 ]6 ?4 Z8 F3 H U/ g ask turtles [ set-car-speed ]4 p2 M, x( h' ]9 y# w( q% x& `; V
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reset-ticks( x4 g9 i' K8 d/ S1 f/ r A
end
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;; Initialize the global variables to appropriate values
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$ x5 A; ?9 }3 ?3 u' c& V set current-light nobody ;; just for now, since there are no lights yet
5 z, u+ X8 N) E. K% o# l8 L set phase 0
/ M/ @- O% h4 z! O, C# ] set num-cars-stopped 0
9 d& P. s- o; ]. ? set grid-x-inc world-width / grid-size-x
" |7 M" C- _3 p2 Q5 D set grid-y-inc world-height / grid-size-y
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6 {- Y* ^# o0 e K) ~5 N ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
6 o% [: V% G; }9 p8 X* @ set acceleration 0.099 Z$ s" c9 B( P5 M9 m
end
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$ ?1 H; t2 F% B# z;; Make the patches have appropriate colors, set up the roads and intersections agentsets,0 w0 X5 m9 b( s* v* w7 L9 F5 Y
;; and initialize the traffic lights to one setting5 K" {) A# F7 Q8 ]. r: Z- N3 d
to setup-patches2 h0 ^# D- o2 M; @' _8 y6 U
;; initialize the patch-owned variables and color the patches to a base-color
" m3 O+ T- B/ }. z. D& M ask patches
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set intersection? false2 @& s/ ?8 t8 c) Z+ h4 b$ T
set auto? false
) C2 ?# }7 J% P2 X* @* K set green-light-up? true
$ y8 h# E" r) ?6 m. [% H; K1 Z set my-row -1' w0 u) M# V/ o& u6 T1 G
set my-column -1
: d1 |# ]2 t- o* B' N set my-phase -1
" W+ b$ {/ k& d# R set pcolor brown + 36 a' U! Y. o, n
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+ E* S& d `# d1 g# L; r5 P, \ ;; initialize the global variables that hold patch agentsets. T. o0 i7 ^, y' `* Z. E9 ~
set roads patches with
* Q6 r/ {$ K, u, n [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or# n' M$ g% A- @# D+ D- U
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
+ Z6 R3 o! P9 B6 y set intersections roads with0 C) @4 e4 z5 `: {) }- ~2 d1 N
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
$ H2 C, B" B) \' D; S (floor((pycor + max-pycor) mod grid-y-inc) = 0)]; y$ |# @( w- V* I8 Z2 e
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ask roads [ set pcolor white ]
& k7 P, ~2 \3 E) Z- X, e4 M setup-intersections$ R% R7 ?- z/ m- t7 z
end
2 L/ i2 e! Z7 g1 K% f" |其中定义道路的句子,如下所示,是什么意思啊?; ~( \! p4 o5 C& X; U- R
set roads patches with2 y" P: _0 D) h9 J: F2 Q& K/ d% C% M2 Q
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or- C* I9 N8 V% e0 d' R) F `
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]# A4 n7 r& S+ u7 G! M8 R2 T* D
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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