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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 u- B* }2 R* [, H) {netlogo自带的social science--traffic grid这一例子当中,
, n! d! e: o9 I' k$ s ]8 q9 rglobals
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grid-x-inc ;; the amount of patches in between two roads in the x direction# U2 _ r% X8 z# Q/ n3 R, ]
grid-y-inc ;; the amount of patches in between two roads in the y direction+ R% Z9 |0 Q2 f. K1 n) V: M. a
acceleration ;; the constant that controls how much a car speeds up or slows down by if
( I: u8 F! N( p9 a1 l3 ~ ;; it is to accelerate or decelerate
. V" t: ?4 E$ ^* \ phase ;; keeps track of the phase
9 p+ |1 x- G' G) r* e- @, V num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
+ G3 D. s( x, m7 s( F( e: p0 c# ] current-light ;; the currently selected light/ F- B$ ^5 G/ I: ~0 Z+ r8 a" o
8 L# l' F# c. o. K( `3 d ;; patch agentsets5 T( @2 C8 o r( d2 k: C( G9 G
intersections ;; agentset containing the patches that are intersections0 v4 l+ G$ [- j s9 b) O K1 N
roads ;; agentset containing the patches that are roads; o7 X7 D' L; T4 H1 D& A6 u @3 F- L
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- R' F: N) _& n' Y9 x. i8 Z" Lturtles-own/ I: c1 ]; J4 ?- t- S
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" i( ~2 M$ i$ S9 n speed ;; the speed of the turtle/ g. J) L4 M' e1 e5 O3 d
up-car? ;; true if the turtle moves downwards and false if it moves to the right& |- c7 T* F) L; L u: L0 s
wait-time ;; the amount of time since the last time a turtle has moved
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' b2 l1 R1 F7 V2 O' k: Bpatches-own5 `0 q0 ]( y7 s# L7 S
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3 E4 t+ E8 w$ W: Q1 r8 v6 s intersection? ;; true if the patch is at the intersection of two roads( |% L' |5 |& `1 G; t1 T5 W
green-light-up? ;; true if the green light is above the intersection. otherwise, false./ ~% j+ C- x$ L/ s
;; false for a non-intersection patches.
5 a$ X$ r, V8 O8 U my-row ;; the row of the intersection counting from the upper left corner of the7 H3 @1 Z/ f5 a/ m F- G k7 X o
;; world. -1 for non-intersection patches.
5 _# y( ~5 R2 m my-column ;; the column of the intersection counting from the upper left corner of the
% a8 |3 r5 v) G3 v ;; world. -1 for non-intersection patches.+ G0 N" @* k% t$ a& v
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
W: u l- F3 T: P( O. F; Q5 c auto? ;; whether or not this intersection will switch automatically.
/ Z% [. v, I) Y& u2 ~; x ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
0 F! j; S( w. g# P( E% |, V- y;; Setup Procedures ;;
4 `# E) y$ ?$ C; a2 _0 c# M7 j;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.
* n9 I1 b4 ~4 F R0 `+ I" R8 Q' g;; Create num-cars of turtles if there are enough road patches for one turtle to6 I- D/ H" O6 _! t# j
;; be created per road patch. Set up the plots.
8 O4 S' e: R9 F& Y8 l& zto setup' U7 J, b& T2 g) b) _
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setup-globals, [' o" e" |1 E; {
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;; First we ask the patches to draw themselves and set up a few variables' j! }; P4 j- s& E# `
setup-patches
5 m1 V9 |% B9 q! _/ |& Q3 ]9 X make-current one-of intersections" K% p( N Z# l: k; h9 [1 c
label-current6 ?8 K3 p3 W% Q, P
9 O$ {% C. E5 o7 `# p6 \ set-default-shape turtles "car") c: x$ w6 b5 D3 k: k3 I" c
* a; ]9 |& v* m, t if (num-cars > count roads)
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+ e: c( z: D' q$ s user-message (word "There are too many cars for the amount of ", x7 g" b F, {3 \9 T @! b
"road. Either increase the amount of roads "
( \( K* u4 r) P! l D* Y$ c8 [ "by increasing the GRID-SIZE-X or "
, A8 t6 x0 G- j( F, t0 _ "GRID-SIZE-Y sliders, or decrease the "4 E/ d) y' } C" J# F* v: _2 R3 g& }
"number of cars by lowering the NUMBER slider.\n"8 b: A" S8 z/ P$ Y- O
"The setup has stopped.")
% T4 N- R0 B- i stop& Z8 z+ C2 |! M" z" C+ X* T
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- Q9 Y8 U1 a. M ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
/ ]" F8 g3 G: q% R( B% d6 | crt num-cars; ^7 w8 ?' F5 o8 w" ?& e
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# F6 M, F# ~8 q( M setup-cars* ?! u4 r+ l% N1 H& T
set-car-color% \" }. p0 e& o+ `& H$ r( a- x
record-data& {5 \$ M8 _% b( s1 P
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;; give the turtles an initial speed
) G V# n5 g: A/ t$ M4 w7 X ask turtles [ set-car-speed ]
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reset-ticks
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: D; S# E$ {( `: B5 P2 L: s( M. X;; Initialize the global variables to appropriate values& z* G- K; ?' m5 c8 J
to setup-globals
6 b$ H# Q' h2 v' Y( [ set current-light nobody ;; just for now, since there are no lights yet
0 h' V% u. h+ q+ N" @ r2 O: u set phase 0( c& U" x0 n: @+ I
set num-cars-stopped 0" s# G7 s1 l3 z, o; M
set grid-x-inc world-width / grid-size-x. P6 o. s# s( \
set grid-y-inc world-height / grid-size-y
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o$ X( T( g+ E ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary5 Z' g+ { x7 o, K7 v
set acceleration 0.099
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2 D e4 R& Q# u' `* c$ \' U;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
6 v# C1 A8 Z1 o;; and initialize the traffic lights to one setting4 M% ~% P# F2 r1 |+ r& [
to setup-patches
2 N0 L, B) k, Y$ l ;; initialize the patch-owned variables and color the patches to a base-color7 a; k3 V8 g/ l; i. n" v
ask patches2 F- t3 q( t: ]4 x N e) i y
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' {- ]' Z# K6 i7 C1 H! u set intersection? false
& T3 D- {7 O, n8 f) L set auto? false/ f+ Z& ^$ t& Z2 m1 G9 J; q! k% Z
set green-light-up? true. n3 | c) R* [ p) m) }) ?% @
set my-row -1
; B0 _! q& A! g, k0 Z, p set my-column -13 e0 @( Q, |' n0 j, I! Q
set my-phase -1
" l+ K; O n, \2 J" E; D* d set pcolor brown + 32 \, l& e! n4 ?
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2 s+ N: y: B2 ~- V+ \- f ;; initialize the global variables that hold patch agentsets
5 O! {% I, C* z0 y set roads patches with
! ~; y% g4 y: I, T. ^( Y [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or& l c& F+ x' W% r$ O2 z
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 a3 s3 a1 C3 Q7 V: o; J set intersections roads with1 ]4 e5 ]1 f. `4 E( g0 G0 v
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and, D7 D4 G' d$ [. s' s; ~3 F) j
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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# Y4 a4 Z! I( N ask roads [ set pcolor white ]
9 _. Q* m5 X" Y; K$ z5 x setup-intersections
0 `3 i& [/ ^# y% T2 j Eend
4 c0 E! y, `- \) {0 G; B1 E: U其中定义道路的句子,如下所示,是什么意思啊?, r7 d @' z9 [
set roads patches with/ L* U- G* t, `/ Q. y# w4 b2 F
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
/ Q9 m- k2 j+ V# t, ? (floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 b7 x* X8 X3 z: P# S
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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