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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。
* s6 L" N& V) x' v* x% h$ i1 dnetlogo自带的social science--traffic grid这一例子当中,( o$ m, R0 Z3 }$ g+ B9 j' ]
globals: P& X( N+ q. H6 n
[
( Z+ f) k; [& n) C1 F grid-x-inc ;; the amount of patches in between two roads in the x direction1 g6 Z+ _, W, V7 P
grid-y-inc ;; the amount of patches in between two roads in the y direction
" D' H; {$ ^2 n acceleration ;; the constant that controls how much a car speeds up or slows down by if @: n3 a+ ]. c+ B- @) ?# H
;; it is to accelerate or decelerate, O$ E+ Y! S$ ]
phase ;; keeps track of the phase; S& ~% @* c" {% O" o0 H8 ?
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure& C+ c* n5 l) R+ K0 [
current-light ;; the currently selected light
D+ u; B4 n4 Y
0 c g' c* ` q9 j ;; patch agentsets
4 C3 I5 r5 Q6 ] intersections ;; agentset containing the patches that are intersections$ i& S7 u( I9 p; k* C6 t" g
roads ;; agentset containing the patches that are roads9 U, S# P: v7 s9 V
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" G- Z7 _8 L& C+ Q6 P1 |turtles-own* b% L- A7 D, e. @) f
[
; D; ]. R+ T' [& x v, T speed ;; the speed of the turtle% \: m3 J T- I3 N9 V
up-car? ;; true if the turtle moves downwards and false if it moves to the right
s9 t% Z9 {, [! d wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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intersection? ;; true if the patch is at the intersection of two roads2 a, e) F' u: @& X) t
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
, O0 k2 ?( @. Q6 ~# R ;; false for a non-intersection patches.
+ F3 n' Q1 B3 ]/ M7 m/ Q1 v my-row ;; the row of the intersection counting from the upper left corner of the
3 p+ b% ~/ j- v; t* s ;; world. -1 for non-intersection patches.& Q8 t$ q* h" u# K: e
my-column ;; the column of the intersection counting from the upper left corner of the
: n m' ?$ ?; A% h& S6 W ;; world. -1 for non-intersection patches.
2 t8 ^1 U1 m2 v3 O0 z3 w, C5 { my-phase ;; the phase for the intersection. -1 for non-intersection patches.5 u1 G( ~6 M; l! M
auto? ;; whether or not this intersection will switch automatically.
5 C: S. C8 L6 N9 _# R5 o ;; false for non-intersection patches.
2 {- m& }# C8 h3 G, _( {" Q]& w, n( j. g/ L$ Z4 g- t- X1 _
$ ?! T. A9 ?3 {1 _) T' f$ q% p0 }
7 @8 f$ x7 h4 \$ m$ ^: `( T;;;;;;;;;;;;;;;;;;;;;;% h8 y9 ?( D$ F$ B# K' K! v$ `
;; Setup Procedures ;;
( F9 _7 r; b) P" n;;;;;;;;;;;;;;;;;;;;;;* V+ K8 F- Q6 n
1 {# c/ z2 h. X& a" W9 j) z;; Initialize the display by giving the global and patch variables initial values.
2 `$ G/ m1 {! j5 }+ U;; Create num-cars of turtles if there are enough road patches for one turtle to
+ j3 G: T$ n0 E& \6 s* @/ m0 V( j9 ~;; be created per road patch. Set up the plots.% Y3 [9 v: r1 g) Q0 R; I$ N
to setup& Z. Q% B( T# ~6 ?
ca
4 ^1 {) x/ j" x: k setup-globals- T& O3 T M) O# c8 s) }% Q: A
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;; First we ask the patches to draw themselves and set up a few variables
% }0 ]) M! h6 E. K9 | setup-patches
\5 r0 ^2 s, D- |9 A5 }8 l3 M; s make-current one-of intersections R8 d" z* j9 `* K3 l
label-current
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8 h& `; j' x5 D( u/ ]& p3 x0 U set-default-shape turtles "car", v' U+ r7 e+ S$ m( M9 ?) z
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if (num-cars > count roads)" S5 P( g. I; a* ~8 f2 Z
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user-message (word "There are too many cars for the amount of "
, R8 d) q5 k% ?/ W "road. Either increase the amount of roads "
4 g& B7 X. D6 `" v "by increasing the GRID-SIZE-X or "
8 G6 M" z- u) @ "GRID-SIZE-Y sliders, or decrease the "
9 x2 Z9 i2 ?# G$ K "number of cars by lowering the NUMBER slider.\n"" Z" M4 l3 d( ^- ^
"The setup has stopped.")
6 V& K4 K" X3 B$ S' w stop2 a! D; K7 o* i
]: [$ v: ?5 }- N7 ]
7 H5 h% A$ E8 z% u4 {1 C ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
& G8 b b( V- S% i! e# [: t8 a7 [: E crt num-cars
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2 [3 ]5 X6 }, h/ O" a setup-cars
7 e( b g" O. ~* n' W, ? set-car-color$ o9 ~- ^) R4 K$ V3 F8 l
record-data6 E$ t8 ^% \- Y1 @% x5 H
]
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;; give the turtles an initial speed
- s- k# q3 x! ]$ m Q$ V/ C ask turtles [ set-car-speed ]! X3 X1 z) }' f. y
3 }' t) `' O2 E$ ?7 T5 `+ n
reset-ticks
3 Z1 F1 v, p+ Aend
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;; Initialize the global variables to appropriate values8 B9 W# r$ ]1 H0 @# k
to setup-globals
% A9 j3 ?! s" M set current-light nobody ;; just for now, since there are no lights yet* {6 E8 z0 H0 F1 w H) p
set phase 0
/ w2 S. P+ g% H- d$ l* M set num-cars-stopped 0" K7 O6 ]6 Q, G+ ~4 q* w
set grid-x-inc world-width / grid-size-x
6 N w: K5 c1 Z% d5 V 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# L) b8 N2 |3 K$ [1 C6 a) z9 ~
set acceleration 0.099
, M2 D W/ g+ R: A8 ~end# r, o! _( l* b |
2 F0 F9 I5 y2 w1 x5 `;; Make the patches have appropriate colors, set up the roads and intersections agentsets,' F% L7 [$ R% M" h5 J/ b5 z
;; and initialize the traffic lights to one setting
6 [* \ t1 l2 k3 zto setup-patches
7 m T& x$ g! s( c, W& p4 V ;; initialize the patch-owned variables and color the patches to a base-color
* E7 D& D! _6 I1 O/ N& j2 B ask patches
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/ t+ z8 l$ _) ~+ s/ t+ m* x+ P4 R set intersection? false# m3 n+ t. ]3 x7 e9 V, K( E" l: o3 w
set auto? false# Z# Z4 ~& c. f5 X, w" ]
set green-light-up? true5 n8 k8 D' J8 L' l3 H: J" [
set my-row -1
/ g. d' \* H9 F3 @% A) I: c ^) g2 G set my-column -1
1 i( y; H( u/ Z/ m- z: N: x set my-phase -1
$ ^' P7 r" B+ Y7 r7 P: G3 F set pcolor brown + 3
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. u: J" E! o# k; O( v) x6 P ;; initialize the global variables that hold patch agentsets
! S" a( L3 f+ M* { set roads patches with
$ J& ~6 _4 U: P; ~1 J [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or( k I( c1 W. Y& j' |; F
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
) b) Q+ u& D1 C1 @( | set intersections roads with
: m) f) {; l: W2 {- M" C [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and) X) q9 e& j- r8 u
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
& j. T2 h' {% f1 I setup-intersections7 p# N) Y- K8 [; D7 @
end
$ K4 p8 z: f9 S3 T* q5 a其中定义道路的句子,如下所示,是什么意思啊?
4 f1 `1 i. P0 S( D8 S set roads patches with
, w" t* a7 e( N+ z [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
# S4 U, {: A5 j; O1 `2 [( M" h3 R/ L (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
' \6 r6 a5 L' j( d6 `+ s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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