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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。; y( h9 h: K+ [
netlogo自带的social science--traffic grid这一例子当中,
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grid-x-inc ;; the amount of patches in between two roads in the x direction
3 L2 R7 z5 U5 Y$ I* @$ [- l grid-y-inc ;; the amount of patches in between two roads in the y direction
* j/ j& }9 {, U! D acceleration ;; the constant that controls how much a car speeds up or slows down by if: C, {$ O* E5 q- Y
;; it is to accelerate or decelerate
) b& m1 e( l7 u* `; c. ?8 R phase ;; keeps track of the phase4 v: _: f2 H, [1 j4 w
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
" ?! Y, L5 ^ w* O! n; b current-light ;; the currently selected light) L3 @4 @9 f. V9 [$ J
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;; patch agentsets! Z) O) b, h3 Y! {
intersections ;; agentset containing the patches that are intersections
) n7 P+ S5 Q# f' d( z' U7 L" X# h roads ;; agentset containing the patches that are roads N" b& X, M* _/ s, c
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) j: B; T- F3 }3 Z, w+ b' Vturtles-own; b) ]1 B2 {. H. A, _) R! C- [: w) d# z
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9 A: O; }; t# o3 h% b speed ;; the speed of the turtle& m& a! s% [. Z! ?$ ^
up-car? ;; true if the turtle moves downwards and false if it moves to the right
6 E! \, G5 ]) Z; K* e0 D) w* J wait-time ;; the amount of time since the last time a turtle has moved
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* H5 C; o t) ?patches-own" y t$ Q1 {4 e4 v" q* G
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. h" S0 W* Z( s7 j `% V intersection? ;; true if the patch is at the intersection of two roads6 H: G+ L. O0 a5 u/ k6 U
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
) T. Z& e6 S& J5 D ;; false for a non-intersection patches.4 A# R% E7 M& g0 D* D* \0 K
my-row ;; the row of the intersection counting from the upper left corner of the) C$ W/ K; C0 X5 o9 P
;; world. -1 for non-intersection patches.6 _0 P* f. d0 N* S. {; R9 o/ t
my-column ;; the column of the intersection counting from the upper left corner of the1 q" Q/ C0 }3 {* ?+ ^& T+ o2 U
;; world. -1 for non-intersection patches.
- r! b7 o( D7 K: _4 T$ { my-phase ;; the phase for the intersection. -1 for non-intersection patches.' B/ U6 G/ `6 ?# B! h* P
auto? ;; whether or not this intersection will switch automatically.
?/ w$ Y3 R; `" H: Z; _ ;; false for non-intersection patches.) n+ Z7 ~8 d7 r* r& T! C
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;;;;;;;;;;;;;;;;;;;;;;. }$ ]0 Y9 h, `7 p
;; Setup Procedures ;;; S2 j ?$ B/ L# X6 Q+ {& _9 p7 [; l
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;; Initialize the display by giving the global and patch variables initial values.3 ], [& H! p/ I: |
;; Create num-cars of turtles if there are enough road patches for one turtle to
& j9 \/ S' l- g) h0 U1 ~;; be created per road patch. Set up the plots.% o* Y( m( [$ k) F% a) P# P# d
to setup
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1 E$ A" S" b) J+ O: g3 [1 N, s setup-globals# z" w6 ^9 k4 w7 z; t
8 c' }8 I" T- d4 e0 S* U ;; First we ask the patches to draw themselves and set up a few variables
" }! j7 v" v' e0 P% ]" X" @4 q setup-patches
8 {# D, [4 W+ n) o4 w. u make-current one-of intersections
2 j9 I2 z4 N& l+ v* {! a label-current
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/ H) ?: W$ j, `& m# [. Z& X z set-default-shape turtles "car"4 G( H1 ^1 x& A9 ^
( d: w1 r, M) r0 { }5 ~ if (num-cars > count roads)
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* w+ Z8 ~2 B z5 ` user-message (word "There are too many cars for the amount of ") @$ e' v* \( h1 D
"road. Either increase the amount of roads "
, e5 N" O) N" A8 w "by increasing the GRID-SIZE-X or "
! k. A" K Q5 N3 ] "GRID-SIZE-Y sliders, or decrease the "5 }0 i8 K' C; v8 s8 H3 f% R- _
"number of cars by lowering the NUMBER slider.\n"1 M8 b0 G6 H; F% M) j2 r
"The setup has stopped.")2 }- ~. t- J" ~; B4 ?, d
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
6 Q# X) d0 s8 P% I crt num-cars
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0 i) o, O% x R% s setup-cars6 ^' |! O, \8 G6 Q/ s
set-car-color
5 `) m+ T3 @6 g# {2 x record-data
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7 o' Z$ t' H* j* q ;; give the turtles an initial speed" q: X* B2 u; v. h% V7 y
ask turtles [ set-car-speed ]; C* y" Y8 q5 ], U# L
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reset-ticks
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;; Initialize the global variables to appropriate values
v3 Q) U0 S) r. ~ x# Z8 s( nto setup-globals
7 O- y# N; A* P8 I# O3 N% B; p set current-light nobody ;; just for now, since there are no lights yet4 n: O1 Z/ N/ b" M' o4 o9 P
set phase 0
0 W7 V2 S" V/ @* R {3 f set num-cars-stopped 0: P2 [' F4 O3 T( N9 Q5 s
set grid-x-inc world-width / grid-size-x8 e' _: C/ ?' S4 ^3 q2 v( ` F
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 Q- M/ p$ \ j
set acceleration 0.099
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5 J9 N; f; p. n;; Make the patches have appropriate colors, set up the roads and intersections agentsets,8 }4 s) ~( w# d, ?( M1 ^
;; and initialize the traffic lights to one setting
( y9 a z$ \4 jto setup-patches
. g2 ^& z$ g( f) F ;; initialize the patch-owned variables and color the patches to a base-color
, i/ w, w' b; u5 M x+ O ask patches! N# P- A# [6 B$ j8 ~6 \
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set intersection? false, T5 j- C! H& S3 W6 l' x
set auto? false
0 s2 @5 T6 e; {( Z" n$ d, d0 _ set green-light-up? true
0 a/ h* R9 m9 j7 m2 Y set my-row -1
5 b" o, M9 |; e& y, U' K7 W set my-column -1
5 o/ Q. Z, E3 O/ C' e6 O( _ set my-phase -1, j; W4 M0 Q' b8 t' C! }' v" a* [
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
- Y& g' M1 ^" A6 i set roads patches with1 y# `) y* u' r+ Z; ]7 c; M
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or" }) l7 h5 w' E- b3 M5 X0 P5 f
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
+ h; ^3 l/ J1 i7 `2 {3 ~" D2 N- J set intersections roads with
9 _( x, a2 d+ `, G. i1 {3 H) j [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and* u. E; D+ Y$ d' t
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]$ l% f$ z! {& g/ [3 V' F6 Q9 P% z
3 l! T/ Z# e# M9 B' H ask roads [ set pcolor white ]: H9 `$ E* q. F1 c
setup-intersections' @" P- C: h" M1 t- R% T
end
* z5 I0 z# |! s6 y" w其中定义道路的句子,如下所示,是什么意思啊?
" }. i- @6 [* B set roads patches with3 J: S( ~4 w z( W2 B' X
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or, z' D8 c. s7 i( U2 P( Q
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]+ V) A3 D0 P+ E4 V9 @9 `# p
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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