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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# ?7 S' z- a- _+ i s( X7 J5 t. hnetlogo自带的social science--traffic grid这一例子当中," ]3 \( @: l! i2 Q
globals
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( J e* N! c- y$ A# b2 X4 U: C* d7 T grid-x-inc ;; the amount of patches in between two roads in the x direction
- n8 m) T f0 c8 R4 k4 ` grid-y-inc ;; the amount of patches in between two roads in the y direction I' h3 j# G: c
acceleration ;; the constant that controls how much a car speeds up or slows down by if
! y7 Q3 t# u+ b+ z9 k ;; it is to accelerate or decelerate1 ~! C! C5 t! \1 ^0 d; ]; B
phase ;; keeps track of the phase' z/ E' Y4 h7 k/ A2 r3 |
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure0 I: Y8 W& ], [( [9 D& E4 g+ q
current-light ;; the currently selected light
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+ l: u& A m$ o$ H8 x. x2 } ;; patch agentsets
3 F+ t" A6 m- [6 ` intersections ;; agentset containing the patches that are intersections
" u, m; ]% V5 K roads ;; agentset containing the patches that are roads
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) R: {2 S- O' y0 }turtles-own& N; ^' Y6 U7 ]( w% i5 X* v
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" H) {/ S" _2 c$ S+ K- ]% ^ speed ;; the speed of the turtle/ e9 J# c6 t" k& U0 X
up-car? ;; true if the turtle moves downwards and false if it moves to the right
7 b1 C* g; j/ Q/ u wait-time ;; the amount of time since the last time a turtle has moved* L2 g! k. X( ~; ~, [$ Y- k
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- C% S, y3 ]* I( A" T- M* h7 gpatches-own, c$ ]: l" F: E+ }* E3 {
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intersection? ;; true if the patch is at the intersection of two roads
4 c: B2 v& f" q" T+ I green-light-up? ;; true if the green light is above the intersection. otherwise, false.( p7 ~0 S+ T* k5 @' B+ u0 X0 p
;; false for a non-intersection patches., u/ D0 E/ t! N% ]1 c
my-row ;; the row of the intersection counting from the upper left corner of the
3 _+ T( t; q; M& g3 G ;; world. -1 for non-intersection patches.( p- r h" j w c, Q/ d |; q; [
my-column ;; the column of the intersection counting from the upper left corner of the& {0 u# }" E) B6 t# h. S
;; world. -1 for non-intersection patches.
5 O4 ]) z2 b. \' A my-phase ;; the phase for the intersection. -1 for non-intersection patches.) q( N" C* o; f; M+ ~
auto? ;; whether or not this intersection will switch automatically.
9 F4 O0 j; t, J# x% ?4 D( } g S ;; false for non-intersection patches.0 ?& n: g7 z8 s9 L6 r
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1 I6 s' {' R" E: v8 N;;;;;;;;;;;;;;;;;;;;;;
2 |4 D' U; B4 b;; Setup Procedures ;;
: {# X: L* W, Z* m;;;;;;;;;;;;;;;;;;;;;;
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$ c& _4 Q7 C' d;; Initialize the display by giving the global and patch variables initial values.
$ I" A! h0 @* \, U;; Create num-cars of turtles if there are enough road patches for one turtle to E, B6 b) I& z9 |
;; be created per road patch. Set up the plots.
; s" y5 c( P/ E( Q9 L! ]4 lto setup" ^& [, n( L+ I5 ~! y# R
ca
/ O, E. @4 i* H2 T4 T0 }' { setup-globals
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" e2 l+ }3 O5 e: j; D! ? ;; First we ask the patches to draw themselves and set up a few variables
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make-current one-of intersections; T9 p) [5 b+ v; c' z
label-current
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* k O2 Q3 U4 _' O6 a set-default-shape turtles "car"
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" ~# W1 G* d1 U" B& U6 I if (num-cars > count roads)
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2 u% X2 t; a( n* y3 U) |6 w user-message (word "There are too many cars for the amount of "
! o! f, y& V5 G- c, q' ~ "road. Either increase the amount of roads ". N" m5 K+ P/ v3 [2 h3 W1 k
"by increasing the GRID-SIZE-X or "
8 J7 J' i2 P3 _9 U" V( y "GRID-SIZE-Y sliders, or decrease the "0 p! Y0 i! c. g4 t; f" u7 Z9 v
"number of cars by lowering the NUMBER slider.\n"$ I; G/ H$ p5 M3 ~
"The setup has stopped.")
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color# f% b$ F2 w) G3 N
crt num-cars: O* L, `2 \6 K
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, t. l% M8 ^" k. ^( O9 D setup-cars
# x* B9 h) [$ T2 S ^9 W set-car-color
# @% s5 ?% v! u+ \9 H record-data
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;; give the turtles an initial speed: l$ E+ e3 R% r( x3 Q0 E0 A
ask turtles [ set-car-speed ]
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% L# ]5 x' ?# j" w( |% G- ` reset-ticks8 e4 c; @" y* N$ Z3 w
end$ Y4 T" Z ?* R2 ]' {
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;; Initialize the global variables to appropriate values9 f! z( Y; ^ k
to setup-globals" [9 `" G) K. c3 _/ M" v& q
set current-light nobody ;; just for now, since there are no lights yet k: k: c y4 n+ x
set phase 0 t9 a2 X2 P+ Z
set num-cars-stopped 0: p7 \$ ^& ?. x
set grid-x-inc world-width / grid-size-x1 N6 F7 w u& W9 C9 L
set grid-y-inc world-height / grid-size-y
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3 W7 z% A) @- W% O' r2 c: X/ N ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
0 V4 P- W: r" D% o3 a; ?+ B) I& Y set acceleration 0.099; Q# Y; E; y+ ]0 t' Z" r, B
end
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7 {0 o* K' j' ?0 K* r' |;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
+ M. n$ j, }8 {9 K4 w: }2 }( W0 Y;; and initialize the traffic lights to one setting
) u" }+ r* f* k* Tto setup-patches
& A1 @0 E4 E# `; _8 F9 A ;; initialize the patch-owned variables and color the patches to a base-color
0 s- z: `( D4 }, J4 l ask patches4 _% g6 Z; m* R; _. r9 h
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P+ C. c7 \, W/ L4 B0 T9 U6 q& Q set intersection? false, N+ G5 b3 d# U/ H! w& S* U9 z
set auto? false
7 l5 A" z1 S% o: n" m2 S% K set green-light-up? true
" V2 r1 B4 c$ c( w+ _ set my-row -1
( b; x# R, z4 e! j, R* D set my-column -1" J5 ?* p+ R; P3 j1 z0 i/ \
set my-phase -1; n& Z7 ?" k# U8 B9 W+ g) t
set pcolor brown + 3( P2 d% V3 k* {5 G3 |0 A* Q4 i
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;; initialize the global variables that hold patch agentsets
9 A5 }* ]$ w. g& L set roads patches with
1 S6 Q1 ^2 n" P. b8 l9 l [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
; o8 Z4 j* C2 i (floor((pycor + max-pycor) mod grid-y-inc) = 0)]6 b1 f9 r: B% X8 D+ C2 t0 I/ b
set intersections roads with4 C0 z9 y. l/ A$ j
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and! W7 w1 h$ ~& i
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]/ z# x' ` I" w% Y/ K7 A! `
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ask roads [ set pcolor white ]. W/ e% Y( o6 N
setup-intersections
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7 S) t/ Z* D; n' r c! L其中定义道路的句子,如下所示,是什么意思啊?, V' j3 e C1 S5 S- j
set roads patches with
9 T; h, b* b+ x7 q, L C8 j [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or3 {8 h- k( v2 `
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]5 Q0 q0 V9 h) ~' z. i! P3 ~5 R# b
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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