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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。
% [4 `! Y+ \5 I3 unetlogo自带的social science--traffic grid这一例子当中,7 }) k x& V) W/ X, W
globals/ B6 x2 q( _2 @. J0 C8 A1 y
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grid-x-inc ;; the amount of patches in between two roads in the x direction0 d$ Y, Z& q) j) {9 \( `( C8 a
grid-y-inc ;; the amount of patches in between two roads in the y direction
4 [ ]6 @4 w( b! q. j+ J# E acceleration ;; the constant that controls how much a car speeds up or slows down by if
: a7 E4 T1 q: g& u% l' F( ` ;; it is to accelerate or decelerate
( |, m3 `6 ^' N. M- u3 X; [1 m7 ^# h phase ;; keeps track of the phase8 T: d% J+ q5 T
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure& [+ _/ y# C! M$ d& H. s
current-light ;; the currently selected light* p& G: G6 Q3 X+ Q
) I# g {5 f: p9 C* r: e. r0 Y2 { ;; patch agentsets D0 r6 }, \: E
intersections ;; agentset containing the patches that are intersections
/ F0 N8 N5 ~0 z) W roads ;; agentset containing the patches that are roads
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turtles-own
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% Y' c* S' z d" j9 c: |9 e/ X speed ;; the speed of the turtle
! [0 r7 J0 R/ t/ ?0 K& O X up-car? ;; true if the turtle moves downwards and false if it moves to the right2 V* b0 M. u$ A1 e
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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" ]6 m; ^2 E, g$ e, W2 D9 K+ e intersection? ;; true if the patch is at the intersection of two roads: k* m' V- d0 U8 t
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
% m" W, y* d; a2 v* `4 O7 `. b ;; false for a non-intersection patches.
1 Z7 x' C0 S8 }8 Y' \2 F8 }: b' M my-row ;; the row of the intersection counting from the upper left corner of the. _* b8 i$ F" l, {+ t
;; world. -1 for non-intersection patches.9 \# q1 J; v" u
my-column ;; the column of the intersection counting from the upper left corner of the
. f% U5 z' ~" i# ?% W ` ;; world. -1 for non-intersection patches.
- v7 k, L P; j7 J1 G: K5 P my-phase ;; the phase for the intersection. -1 for non-intersection patches.
) U+ G$ k+ V7 ^! G7 T6 y$ s auto? ;; whether or not this intersection will switch automatically.5 R2 T3 O) f9 b
;; false for non-intersection patches.! R) m$ q; e ?; t! N( Y
]
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6 s. w; I0 o b9 ~6 m;;;;;;;;;;;;;;;;;;;;;;7 d/ ~8 n& q2 q8 `
;; Setup Procedures ;;
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; L/ C; Q9 k) N) r# D;; Initialize the display by giving the global and patch variables initial values.$ q9 Q j, v+ v" ^
;; Create num-cars of turtles if there are enough road patches for one turtle to! `( c: Y3 V" U3 K4 n
;; be created per road patch. Set up the plots." Q9 `, X& V2 N3 s: U. s7 H* m
to setup$ [" ~5 R2 W* b( X" D( h; A
ca
" E+ Z) T$ N; ^9 k setup-globals% _0 n7 o: H/ Y0 G+ l5 V5 A: L: ^- b
- @" W$ |6 v9 Z* M7 w' A: U ;; First we ask the patches to draw themselves and set up a few variables2 d) R' d1 G5 D1 a9 A3 W' {5 B- d
setup-patches
' o. U( b# G/ o. c% L( G. ?( {$ X make-current one-of intersections) l) E/ `' A1 ?/ y
label-current2 H% C* H# ]6 D; x* T. @3 ?4 W
- z; H' s4 h* U9 _6 x/ e7 x set-default-shape turtles "car"% ^+ K2 Q4 B( n9 ~' C! Y
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if (num-cars > count roads). c# |8 x7 X7 `8 t
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user-message (word "There are too many cars for the amount of "5 A+ w2 y* P0 H, D+ `( t
"road. Either increase the amount of roads "
# K# Q, b" z; v* @; b: ] "by increasing the GRID-SIZE-X or "& n5 M. ]. z# q0 s
"GRID-SIZE-Y sliders, or decrease the "$ j1 T4 c2 G( }' h. U: a
"number of cars by lowering the NUMBER slider.\n"1 w! j: S7 U+ r* D
"The setup has stopped.")3 [- k' w, Y5 V7 t- ^5 E
stop) J4 ^) q1 G7 b
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/ J/ N) u( E s ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
) M, U4 o9 k Z crt num-cars9 p* d+ R. [0 M" X; h3 r
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setup-cars
5 l: Z9 \) {# f3 O set-car-color
) F. q; j2 h7 L" {& ~ record-data3 k# B7 N" D! B6 ~1 I) z8 `- w
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7 W% [& v3 t7 ?2 \ ;; give the turtles an initial speed
4 k! s) |, ?' [8 P } ask turtles [ set-car-speed ]3 L4 s# @; Z9 l' q# H1 l
( K. E! i3 S2 D$ C4 W9 o( C6 Y reset-ticks
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. u/ o) p# B0 O/ N8 m5 n( ?: m* g;; Initialize the global variables to appropriate values# O$ w8 @- T0 Z. v( C/ L3 M
to setup-globals
' Q/ ]7 |, \( N5 q& u- w: S& S set current-light nobody ;; just for now, since there are no lights yet5 D3 p3 d3 B+ A3 D
set phase 0
5 \! i* J: _% F set num-cars-stopped 0" Q7 ?! l3 t, n! C: c; M" ?
set grid-x-inc world-width / grid-size-x
4 K5 m [" w4 B! y, G1 n set grid-y-inc world-height / grid-size-y2 Q) ^! \0 f8 n+ i( v$ q
( b; f, c" v, I" c. ~ ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
8 v) R: a& `. [2 q2 W r set acceleration 0.099
, f. G6 _% u: W! i/ h/ Eend3 B, L" D3 p* n
( z% {4 |+ D% [- z2 ];; Make the patches have appropriate colors, set up the roads and intersections agentsets,
2 `& p( b7 {9 k;; and initialize the traffic lights to one setting
, O c3 e% D' \: Y# k* qto setup-patches
. ~, h' J- S) r, | ;; initialize the patch-owned variables and color the patches to a base-color
! H& O! S0 w; `- B# m W ask patches3 J. |) g4 C3 M
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set intersection? false; ]# t2 O4 J6 G$ E: {
set auto? false1 V% C, a3 R6 r9 l- {4 X
set green-light-up? true
: B$ h( B& V9 H set my-row -1
@ Z4 q& u9 E) H5 Z/ C: p0 o) k set my-column -1
9 s3 v5 \+ ]6 U/ i+ k1 D: _5 Q& ? set my-phase -1
) b/ v/ ~6 `* _! l, e8 W1 o set pcolor brown + 35 o3 B; k+ N$ w" Y
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;; initialize the global variables that hold patch agentsets" N2 S h' A) a* V/ l9 z4 R
set roads patches with
+ [7 c: k0 { ?# ^- O [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
, b( t1 ^+ S' O& ^" w" \ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 X! p& y" G: c3 T/ r+ `2 n0 A
set intersections roads with- N! q- s8 ? ? ?8 P7 C0 k% P/ u
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
, P8 [: r% U7 j6 I (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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) a& {* t0 F4 k( I6 V# ^! W ask roads [ set pcolor white ]) d# Q5 b/ x! W7 @1 ]7 T7 R
setup-intersections, V. Z! X! z$ _" D, _& b" a
end1 y9 s! T/ R, R# m* u8 h* e a- u7 G
其中定义道路的句子,如下所示,是什么意思啊?
4 k+ p2 [6 g9 P0 f set roads patches with
8 A5 A# u" f4 [$ G( ~) ?# N* @& E [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
@3 g* D) g; E (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
q* _% E& q* i( o1 b) D0 z9 _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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