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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。
0 e3 _. [/ W6 o: Enetlogo自带的social science--traffic grid这一例子当中,
0 ]' k+ V' v1 E0 \" ?globals
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6 f5 R; ~. Z5 l. G grid-x-inc ;; the amount of patches in between two roads in the x direction
: H7 }+ U1 _6 {' ~2 d" n0 A grid-y-inc ;; the amount of patches in between two roads in the y direction' d( }8 ^% R- M7 R
acceleration ;; the constant that controls how much a car speeds up or slows down by if
8 R3 v2 K" m1 s+ o) b$ w ^ ;; it is to accelerate or decelerate
' L) R+ L$ [( K6 ]% H- U9 F U% Y* W5 _% h phase ;; keeps track of the phase" J f0 n# i# T$ b
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure( a4 ~* ?" a- y, O5 r
current-light ;; the currently selected light
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/ e2 w- D6 O3 i8 c ;; patch agentsets' h: A0 a2 @4 K' }' |) x9 Z0 S, M
intersections ;; agentset containing the patches that are intersections2 A! X V! H; m! h
roads ;; agentset containing the patches that are roads
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turtles-own/ E! D( U) A9 D5 w8 H. U
[
; m( P, l0 V [$ ] speed ;; the speed of the turtle
% M* k: ?5 I( P0 v4 S up-car? ;; true if the turtle moves downwards and false if it moves to the right
* ^- {) w! `6 Z& b) A6 ^6 O wait-time ;; the amount of time since the last time a turtle has moved7 L' c( d/ {0 ~0 s( t
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$ W( M ^: T1 _8 }/ V- ]7 [patches-own
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' w. W8 ~7 x) l9 V( e intersection? ;; true if the patch is at the intersection of two roads. _' r' N" _: j$ E
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
# A' Y5 O4 E- A2 b5 `- k ;; false for a non-intersection patches.
* `9 s' V- H) S* U; E my-row ;; the row of the intersection counting from the upper left corner of the
8 f1 S6 I v) L4 F0 _; W ;; world. -1 for non-intersection patches.
/ V4 _: e# U+ [9 |0 o3 S my-column ;; the column of the intersection counting from the upper left corner of the& T+ n2 |: o3 |$ j$ {" {* r
;; world. -1 for non-intersection patches." k+ S( h4 m8 a; v, i* @
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
* Q/ T% _' U2 y6 C5 b& E6 @ auto? ;; whether or not this intersection will switch automatically.
" }1 g" d! v8 N% a+ c ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
& w: }3 o& e) h$ Y;; Setup Procedures ;;
7 ?9 W- M( c0 K" S6 F;;;;;;;;;;;;;;;;;;;;;;9 y" l" B* m5 n) Y& m
* x% u7 L+ D8 d% j# U' g: D9 z;; Initialize the display by giving the global and patch variables initial values.' ^* z/ t5 h8 ?. L; \
;; Create num-cars of turtles if there are enough road patches for one turtle to
) }5 s" P+ |5 ^0 g2 v& A;; be created per road patch. Set up the plots.
3 s! C/ f9 R9 W; bto setup% u! w$ a0 ?5 w/ t6 f y' c i
ca
2 S& y- @! Z- j8 y7 _ setup-globals
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4 j' m9 ?% R( [! e7 Y2 X& S ;; First we ask the patches to draw themselves and set up a few variables# ~$ K% s: c! E2 E8 O; I6 Z
setup-patches! H2 w% P! Y* B, o( q- K
make-current one-of intersections
! m; s# S/ E6 @5 E label-current/ o# Z$ U2 V% j9 }* ~( j# m1 a8 O
4 r5 T. ]7 ^6 F1 { set-default-shape turtles "car"8 X" s" ~3 |8 K8 C2 C" K7 d
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if (num-cars > count roads)& q! W1 _0 V. E7 t: ^% w
[
# T7 B) M0 [8 m* L0 I; {6 H user-message (word "There are too many cars for the amount of "% o3 ~( X5 }2 @" {5 {9 p
"road. Either increase the amount of roads "* i8 j0 ~) t+ X, k
"by increasing the GRID-SIZE-X or "
) H7 g3 P; G$ X: O% X) a, L "GRID-SIZE-Y sliders, or decrease the "6 }( _9 }" S l! R" K" d# P, I: t
"number of cars by lowering the NUMBER slider.\n"/ I" _ a; D3 e" V
"The setup has stopped.")/ E" x" h, E( z; c" ~
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
2 c% i8 u5 c, f% {$ F crt num-cars
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6 @0 H+ C# [# `# K* _ setup-cars5 ]+ z( a- p$ g1 f6 B+ l. f; _
set-car-color. L- N& z% z: {& [# s
record-data5 ] X5 f8 F$ w& B8 Q
]
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; A" F- p, V8 M, f ;; give the turtles an initial speed( b' M) b* ~* u& R, k8 T: I$ L0 B9 w
ask turtles [ set-car-speed ]2 ~3 M9 M( Y) V( L! P
4 V' y/ l3 [. ^ reset-ticks
& c& {( ~& t% v: M/ a5 ?end
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9 S# l4 X, d) o6 A, ]9 i;; Initialize the global variables to appropriate values, f* n9 ]3 q. ~
to setup-globals
6 e8 ~- g/ C8 @7 o set current-light nobody ;; just for now, since there are no lights yet
2 f0 w; B0 U3 t. x! ^ set phase 0
$ O7 v, t2 D3 N* I2 a/ c8 H set num-cars-stopped 0
, g' J; A8 q$ o) { set grid-x-inc world-width / grid-size-x
# e) s+ }+ N" y: r# \ set grid-y-inc world-height / grid-size-y; G. n7 c5 O1 f! t; a& F
1 ~# }1 m! Q t2 ?: Z( X ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary9 k1 e2 s ~3 b
set acceleration 0.099
0 J5 U9 }; |. G" x$ y" zend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,' ^* p( L; _4 a( Y4 h
;; and initialize the traffic lights to one setting! k) G0 G6 C( P
to setup-patches# j, B7 h) \9 o+ B# v6 Z: e( F
;; initialize the patch-owned variables and color the patches to a base-color
" Y* t! m) f. S B ask patches
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set intersection? false
- v- q+ A* x! d$ \+ y0 ` set auto? false% N8 I7 D1 i: ?( ]0 }0 m8 N
set green-light-up? true6 C/ x8 ?7 q R
set my-row -1$ {4 V3 r# _ h* Z
set my-column -13 K0 _, }/ a1 b
set my-phase -16 E0 _% a3 F0 i* X& X8 g$ W
set pcolor brown + 3: X2 d- M: F1 D6 y% `/ N5 J8 k
]
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0 q0 O, U7 H6 \8 h4 b. o# a9 v ;; initialize the global variables that hold patch agentsets! n8 K$ E V& ?) N, n
set roads patches with
6 Z7 F' q' r, t0 s) [1 R- O6 h [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or; e/ U5 P, h6 V) @5 m) ^5 ^
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
2 z7 F: P* m# `9 [7 s set intersections roads with' V# ^) q/ h: T8 f+ e
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
# h- S4 _' U( O x8 r (floor((pycor + max-pycor) mod grid-y-inc) = 0)] n; G' I4 e; g, r! ?" T8 }
9 Y& v& D! x5 r7 ] ask roads [ set pcolor white ]2 x6 [- c' p+ a1 k: P4 H+ v
setup-intersections
3 q. `2 E, o2 R' c1 K9 Rend
: k1 }% H& C# K其中定义道路的句子,如下所示,是什么意思啊?- v& A% r& V9 h& d6 U' q* T
set roads patches with
- H) }- p' |7 T8 e' F* ^9 H h9 W [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
; @2 k6 N/ K1 E s+ r* _; R (floor((pycor + max-pycor) mod grid-y-inc) = 0)]+ M- W7 Y* T. l& L* v& e2 R! W
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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