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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。
' ]. B' \3 k pnetlogo自带的social science--traffic grid这一例子当中,/ \0 Q# O$ x! L3 @0 a
globals9 p8 L& U) m) K: o3 `% K. p
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grid-x-inc ;; the amount of patches in between two roads in the x direction
. U0 \% Y2 R7 l+ y) R5 r3 H grid-y-inc ;; the amount of patches in between two roads in the y direction
5 X: r& ~1 }! c acceleration ;; the constant that controls how much a car speeds up or slows down by if* X9 T: V% W) J) }& u8 `; Z
;; it is to accelerate or decelerate
; O0 S& {* k& M, r3 a4 T phase ;; keeps track of the phase
N: l: l$ U- y num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
7 L! m# S- X* [9 p current-light ;; the currently selected light
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;; patch agentsets
P, v+ r0 G, h8 l# z intersections ;; agentset containing the patches that are intersections0 |9 h4 |' b$ ~# m0 M2 U& b! k" A
roads ;; agentset containing the patches that are roads9 x) R& G9 Y7 x2 `( U
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turtles-own" Y/ [4 a7 F3 ]' X& F1 g: D
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speed ;; the speed of the turtle
5 H/ T+ i. K1 @# Q+ ^" e- G up-car? ;; true if the turtle moves downwards and false if it moves to the right V1 w! D% p5 g% c/ N
wait-time ;; the amount of time since the last time a turtle has moved
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+ f: }0 `$ O2 D& V# a Y( }1 W/ Opatches-own
+ v( z _& D1 o- G+ f[# R- S2 I# E1 I. |- F. z
intersection? ;; true if the patch is at the intersection of two roads. k) ~1 s/ c! r* O! W4 K
green-light-up? ;; true if the green light is above the intersection. otherwise, false., e8 h$ m& r6 Y4 y; G4 ^
;; false for a non-intersection patches.
4 R# w! u& V1 N5 C7 k+ \ my-row ;; the row of the intersection counting from the upper left corner of the! B# p) G, @- J5 M. t
;; world. -1 for non-intersection patches.( P- {' B- l% e5 v2 \8 q6 `
my-column ;; the column of the intersection counting from the upper left corner of the7 R6 i! n& c, ^# I8 ?% b
;; world. -1 for non-intersection patches.4 z' R8 S1 n- s, M1 L) E3 z; n- a
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
# _2 L* }# F6 w! }( r auto? ;; whether or not this intersection will switch automatically.
% @/ f& Z# F& }6 Y' t: s ;; false for non-intersection patches.4 {6 b5 d# E6 C& \+ T. W
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;;;;;;;;;;;;;;;;;;;;;;( V: J3 S. G9 x4 O# v
;; Setup Procedures ;;( S9 B& v. m6 f# \# B- U% ^
;;;;;;;;;;;;;;;;;;;;;;2 [- {8 p" H9 k$ M9 @4 i
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;; Initialize the display by giving the global and patch variables initial values.. p7 E% d" p8 y% E# g: a5 f& O
;; Create num-cars of turtles if there are enough road patches for one turtle to
, Z/ ?7 t' g* N7 ~& I;; be created per road patch. Set up the plots.
6 D# t/ u) F3 ?3 h3 B9 sto setup
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, T( t. e# L2 {$ R' N7 h' I setup-globals) O, Z* N0 t4 c! y( {* y' r
$ T x% e; G* f7 ^; [ N3 s0 M9 b; j ;; First we ask the patches to draw themselves and set up a few variables
) i; o! ~, u {. Y- f3 L m setup-patches' Q2 `) i( `) W, @" J
make-current one-of intersections
1 b) q5 b2 T9 `, J0 k: x( L8 D) D& l label-current
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& w* o R( z, Z& P set-default-shape turtles "car"
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7 n3 i1 O- b( d K, I) L2 |8 R r& H if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "3 H' P, `; V) ^; \
"road. Either increase the amount of roads ". J3 Y) E+ H) c% H: A6 _4 h( V0 k7 I
"by increasing the GRID-SIZE-X or "
' v1 e0 b8 v/ M/ w" Q3 h7 _( q "GRID-SIZE-Y sliders, or decrease the "
e' x& b: p1 Y, K- H6 k "number of cars by lowering the NUMBER slider.\n"
7 E2 e( |+ f2 C Q "The setup has stopped.")% }, q$ Q- A" u9 f) K
stop
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7 S0 L0 n! ], e3 | ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color( v5 u& f& O% `/ y
crt num-cars
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+ Q0 r `: v$ ]0 ` setup-cars) e' U. I+ Z9 v
set-car-color9 a6 l: n$ r/ s0 I$ f
record-data
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, l: b. ~& ?% `2 a4 F ;; give the turtles an initial speed( P1 B# S+ |7 f# ^. z
ask turtles [ set-car-speed ]
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reset-ticks, P, ~, h, g, A, n0 y
end
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;; Initialize the global variables to appropriate values6 y/ q$ v! \7 i4 `/ y9 Q0 [. {/ N; n
to setup-globals3 v, {: v; J m9 }; I
set current-light nobody ;; just for now, since there are no lights yet
5 }) U; R4 v; c. o/ G set phase 0
/ M$ w! `- M. l4 m set num-cars-stopped 0- ^- ^7 D' c" H/ R5 T1 m
set grid-x-inc world-width / grid-size-x5 ~9 `5 ]( f3 J, f, W
set grid-y-inc world-height / grid-size-y; `. X; [9 {7 T/ U
+ a$ S% p7 M% M. M& T( `6 G ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary* Y F+ g- A% w2 l% c4 b2 F7 {' [
set acceleration 0.099$ n, ^' a$ E1 m$ R: ]4 i$ y
end8 ~2 ~ ~ `3 u& _. U$ m
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,$ |( D2 G& \0 q/ A, j6 D
;; and initialize the traffic lights to one setting: w$ K& x9 j0 ?/ e z9 q- x
to setup-patches
2 `) F8 @2 Q6 o K5 k4 c8 t3 t8 m ;; initialize the patch-owned variables and color the patches to a base-color
% ]: @: f$ [2 A3 a( d/ x; D+ M& C2 L ask patches
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1 @9 D/ X) s9 K# {" H7 D set intersection? false
$ T% N ?. h; z i4 u* I! }7 b& } set auto? false9 A2 w$ R: d' l+ d. H
set green-light-up? true
# V8 |) _% ^ E set my-row -12 [! q8 T8 _& [, o$ ^( @! B
set my-column -1 V6 {, I3 b D+ |
set my-phase -1
: ?( y) `+ y; l5 K1 l9 ]3 _ set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets+ c, [9 ~. v2 a. D3 j% n, T3 M, C8 p
set roads patches with/ S4 t u3 `$ n7 W$ R
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
) n* k% D* w: I (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
/ X/ A9 d+ I6 w2 A- ]3 `& V( r6 g set intersections roads with
2 ~: j+ h8 u& l8 M [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and$ z6 E$ J b1 U2 _1 _
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]; o, `6 \. \. u' J7 k+ y5 P2 Q
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ask roads [ set pcolor white ]
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end
) y2 W1 O1 i( K1 C其中定义道路的句子,如下所示,是什么意思啊?2 F9 H9 ?# z" V" n% T3 u6 s5 [+ K
set roads patches with+ v$ i/ h. z7 G! o. e5 F
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
9 x- l" [( f) x! J: e (floor((pycor + max-pycor) mod grid-y-inc) = 0)] Q' |3 p( M- _) [
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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