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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。
* \: Q3 l p: [( s/ k+ wnetlogo自带的social science--traffic grid这一例子当中,* E& K$ p% E! ^) t4 f' n2 |+ ?
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/ U) ^" h; u4 A* `' ~& {) K4 U grid-x-inc ;; the amount of patches in between two roads in the x direction" Z9 A2 g2 e5 j/ x& Y
grid-y-inc ;; the amount of patches in between two roads in the y direction
0 S$ ]; B0 t$ r. O acceleration ;; the constant that controls how much a car speeds up or slows down by if
1 B& E- E, ^# L3 A; J6 X ;; it is to accelerate or decelerate
( k/ ~. L' m& S' W& ?, i; F& N phase ;; keeps track of the phase
3 Y% j; Z) V- _% T9 }1 X+ E+ I num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
7 q1 ? r v2 G$ U current-light ;; the currently selected light
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& _& K$ J4 X. r7 l+ K4 E0 |1 h& v, m2 F ;; patch agentsets; ^. g- w" D4 v' ?4 i
intersections ;; agentset containing the patches that are intersections
, g3 w" y9 B2 v roads ;; agentset containing the patches that are roads3 u# N4 z4 a$ | X6 M/ W4 E" ]
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" c A7 [5 X+ Z: s; ~! a" Sturtles-own
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& D* G, J8 @; a$ K' q+ [ speed ;; the speed of the turtle K9 R9 w# {* q9 a, s( I
up-car? ;; true if the turtle moves downwards and false if it moves to the right$ f. N: n* T* o8 K
wait-time ;; the amount of time since the last time a turtle has moved
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8 S }; H6 q* W) Upatches-own
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intersection? ;; true if the patch is at the intersection of two roads
5 X6 T4 \, s/ T- @# [2 J green-light-up? ;; true if the green light is above the intersection. otherwise, false.6 }; ^* b: x" {
;; false for a non-intersection patches.
9 b/ a q& ]( u/ T my-row ;; the row of the intersection counting from the upper left corner of the9 }+ ]3 E! h7 B( h
;; world. -1 for non-intersection patches.- f# d, Z2 v3 {2 i$ v
my-column ;; the column of the intersection counting from the upper left corner of the" _6 c9 k; V: Y& {
;; world. -1 for non-intersection patches.7 m' F T1 I7 H/ A$ |7 S! }, i) T
my-phase ;; the phase for the intersection. -1 for non-intersection patches. c2 N c' @* A
auto? ;; whether or not this intersection will switch automatically., z6 E+ I9 R u0 u" G! s. a, s
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
% m( i6 {9 d9 r% I% w, n& j6 U;; Setup Procedures ;;
9 }6 J% u1 K, O; b$ A/ }0 s;;;;;;;;;;;;;;;;;;;;;; t6 b" m% }% u
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;; Initialize the display by giving the global and patch variables initial values.1 w, W9 Y; C1 {$ y i* Q( ^" _/ ~! y
;; Create num-cars of turtles if there are enough road patches for one turtle to4 E; A9 e2 X/ t7 K* d# U
;; be created per road patch. Set up the plots.
- J5 r+ Z9 y! }, p3 pto setup
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setup-globals# q$ v4 a( G- Z9 ]
, w0 p( n; Z7 r$ I( e ;; First we ask the patches to draw themselves and set up a few variables
! o f/ s6 b- Y setup-patches e1 B+ o: C" O
make-current one-of intersections
( n" k. |9 z+ i4 ~( E/ T label-current
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set-default-shape turtles "car"+ }9 @# x1 E7 o4 _) Q" p1 @
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if (num-cars > count roads)4 D" ^2 a" j- m
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3 ?( C& A a3 h$ m7 I! ^. r user-message (word "There are too many cars for the amount of "( K3 s9 l# V! D; R( U
"road. Either increase the amount of roads "
5 n# I# p7 p# d "by increasing the GRID-SIZE-X or "* h8 \" [- i6 a/ ~7 _
"GRID-SIZE-Y sliders, or decrease the "
t1 C/ o' u, Y: s8 ? y3 @7 ]. c "number of cars by lowering the NUMBER slider.\n"( Z# W% L" j$ E o3 e
"The setup has stopped.")
& y& C3 w1 o* Y5 R/ L stop$ L( Y* ] V* a8 y1 a, Q
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3 ?6 S- \' F# i w9 v ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color- I/ Y: _1 I; E7 P' g
crt num-cars( n/ r5 ]- _1 X
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+ [* O" K& k* F+ v: Z* @2 ^ setup-cars- D1 Q; z3 `6 o0 e9 R- |4 h1 X8 w
set-car-color
" |1 E2 c# A% e* n1 ~" U; V# E record-data' w! T5 @& p- n" @( a. f0 Y g8 S
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- i2 X% J6 q7 H2 f ;; give the turtles an initial speed5 R- l0 y( p5 p7 b _1 {) n
ask turtles [ set-car-speed ]" N9 \0 Z0 o( y3 w( p4 k; ]
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reset-ticks
- d5 ?6 M; U' ?% h' |9 [end
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+ N7 Q4 i, N$ W& H;; Initialize the global variables to appropriate values
# X/ |3 W; k0 X' w- a& oto setup-globals
6 q/ F* P1 P& b! `/ p+ {- s set current-light nobody ;; just for now, since there are no lights yet
8 x' n2 B/ ?5 s1 A- q set phase 0
$ i0 f9 Y& T) N( H. o) P1 C8 C set num-cars-stopped 09 n- X# B! `7 g' i- u
set grid-x-inc world-width / grid-size-x
* ~5 `# ]& D* s+ y3 J set grid-y-inc world-height / grid-size-y$ ^1 c6 p% H# m. S6 W
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary3 G; N/ I+ f. {% Z
set acceleration 0.0998 \7 W2 V `% n. _4 G9 c
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* ^8 p8 q) U0 ^5 R;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
; y! |' g& K0 H* z" U2 c) \3 b( V;; and initialize the traffic lights to one setting
G3 T j( S, B- ^" E$ L* Nto setup-patches
+ O! ]! p; L; X: T9 [3 S# } ;; initialize the patch-owned variables and color the patches to a base-color
# ?; e/ h$ O) r! g9 W. ] ask patches3 H$ ?! _, u7 K Q# g+ m
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set intersection? false8 V3 d1 N8 x# y! r2 F$ D
set auto? false8 k2 j" J5 H5 b# F
set green-light-up? true
* ^. L, k% x2 }7 g) f set my-row -1# P1 G& [2 H1 W7 s. V
set my-column -1
$ O* v; W) ?3 I" H8 m/ H- B! v9 w4 ~8 g set my-phase -12 u6 c8 H6 c8 Y9 C
set pcolor brown + 3
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, M, M( X! a6 e: a: m ;; initialize the global variables that hold patch agentsets! `2 @" s) ]9 [- T* p* C
set roads patches with/ T" |% D8 r, V e Z
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
) z6 L, K1 o4 ?- O" O (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
/ k- u0 R" p3 K1 V6 G" ~ set intersections roads with; r$ s$ V7 ^, C" j. W. m' U! h
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and7 M( H2 V+ g8 t! f' S! ~" ^
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]3 @4 _3 R0 V4 U/ j- E8 }( J
$ e0 q# b+ X# G% Z" K ask roads [ set pcolor white ]
6 V# r+ W2 b$ a O9 V P, A setup-intersections; z! U/ v( B% j& |
end
& Y! q% {& P9 b3 ?& p其中定义道路的句子,如下所示,是什么意思啊?0 Z/ K' v* j; w3 s
set roads patches with, M( e2 n9 \: H+ [) x4 L: h" n
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or1 v2 D9 l- S, S2 r# p
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
" q2 r7 ?, M* G( `9 ]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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