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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。
4 d; i; p$ r) [; Enetlogo自带的social science--traffic grid这一例子当中,
1 B6 m0 q S0 S# dglobals
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/ C* e4 s3 M. ^& T" O( I+ Z grid-x-inc ;; the amount of patches in between two roads in the x direction9 Q' x8 ]5 Z( w9 ~# L
grid-y-inc ;; the amount of patches in between two roads in the y direction
$ }4 R" ]! ^. ]1 s acceleration ;; the constant that controls how much a car speeds up or slows down by if
3 |" d# r; V+ _2 F5 L ;; it is to accelerate or decelerate* j) y- Q! C( D& h
phase ;; keeps track of the phase, m* K" s& j$ ~
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
( K) Y+ L% }) e6 m% B d current-light ;; the currently selected light
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6 e0 F* Y( G! i8 x' n4 s# E, y ;; patch agentsets0 e7 g1 e" `% k. a' c6 ^
intersections ;; agentset containing the patches that are intersections' f( e; I1 H {, W- p" W+ d. W
roads ;; agentset containing the patches that are roads2 I4 \; d" g) k
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turtles-own
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1 d% \* a. K( S speed ;; the speed of the turtle2 B; f* s! [, H5 s8 L: Z
up-car? ;; true if the turtle moves downwards and false if it moves to the right
3 f' R+ }! `" c; Y8 l, g! A wait-time ;; the amount of time since the last time a turtle has moved
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! J3 C. Q2 \8 w1 {9 xpatches-own4 @# I8 a8 b* X4 Y
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. b0 |3 Q% w5 a8 Q6 H intersection? ;; true if the patch is at the intersection of two roads4 q m* t9 H' v1 T& p- f
green-light-up? ;; true if the green light is above the intersection. otherwise, false./ }9 s6 E i" v. I0 n
;; false for a non-intersection patches.' b5 k5 m* v- t
my-row ;; the row of the intersection counting from the upper left corner of the
% o: \7 j- m( r. Z1 y5 ?6 h ;; world. -1 for non-intersection patches.
+ q3 \9 J9 C* h8 i8 S* ~/ U# @3 J _ my-column ;; the column of the intersection counting from the upper left corner of the. @" b4 q4 Q8 s3 r/ H
;; world. -1 for non-intersection patches.- ^* r% j: V& q: M O4 @% D% [4 t7 B
my-phase ;; the phase for the intersection. -1 for non-intersection patches.' p7 J6 h* E- C
auto? ;; whether or not this intersection will switch automatically.* l0 U$ A4 Z9 A- g' V9 [
;; false for non-intersection patches.- L1 Y7 j3 N4 k6 M
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1 D4 J7 _5 y' d) L( l! d;;;;;;;;;;;;;;;;;;;;;;% C4 |9 ~: E4 U# w) V4 B9 q
;; Setup Procedures ;;( d* O* N0 d J& ?" |2 N: x
;;;;;;;;;;;;;;;;;;;;;;. i( ^4 m" I5 e! q' Y
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;; Initialize the display by giving the global and patch variables initial values." \. S7 @- x" k, B* j" {% C! M' I
;; Create num-cars of turtles if there are enough road patches for one turtle to
! z4 Y5 V; ^& B/ N) T5 U;; be created per road patch. Set up the plots.! B; j: r1 T- t3 i
to setup. L6 C5 f6 V8 ^# |3 ]9 ~1 j3 R
ca
1 a. }! T3 I1 b8 G- } setup-globals9 R. K2 g0 l3 O- r
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;; First we ask the patches to draw themselves and set up a few variables
9 X( U- O$ v2 S- i8 ] setup-patches5 y% l2 O" \4 `8 O- V& U! ^" W
make-current one-of intersections
9 {1 { D5 O3 j W2 }+ r, H label-current1 d$ H/ b; ]/ F. _" i5 ~/ X0 [
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set-default-shape turtles "car"( {! t7 a4 N" V3 [0 m ^2 v! R
( S2 Z2 @/ K' a- g8 R0 c if (num-cars > count roads)
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& g. o4 Y9 D1 V6 d' g3 w" z! O' s& S user-message (word "There are too many cars for the amount of ", t' y2 k2 D! Q" k
"road. Either increase the amount of roads "7 E. ~& f( Y5 y) Q: {) l) M
"by increasing the GRID-SIZE-X or "& M/ u9 S' i. J3 U- `; S: K
"GRID-SIZE-Y sliders, or decrease the "2 v0 v X, e. f- Z/ a/ h
"number of cars by lowering the NUMBER slider.\n"
. U, g8 s' n, e. r1 m "The setup has stopped.")
9 U: i: y) u" a; H" R stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
& b A$ O8 M. M, b& S4 t crt num-cars
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setup-cars
& \( w# f n9 A; ?: D& w set-car-color
4 Z, L X8 k) V; q4 N record-data0 |( c9 t6 P2 ^/ }3 N% T
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, t7 W4 R& y' ^/ K+ `: b ;; give the turtles an initial speed. j) }! m! @9 t1 H. x: b* k9 v3 ?% [
ask turtles [ set-car-speed ]
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reset-ticks
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. \' a5 [. t3 ^- }0 @. {% f;; Initialize the global variables to appropriate values) M& V, i& j; b2 \; B
to setup-globals/ \: e0 M) c# A* b+ a, s
set current-light nobody ;; just for now, since there are no lights yet
1 N6 N2 `+ [7 d$ N% V: o( ] set phase 0
. }2 Z% S5 P- U& W set num-cars-stopped 0
! P: ?4 N% V' M, N) _ set grid-x-inc world-width / grid-size-x/ ?& v) m- Y; i# }
set grid-y-inc world-height / grid-size-y* ]9 l3 G. T9 ?$ E7 W
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary8 s# g4 n- H4 G: j, b) n
set acceleration 0.0993 K$ s. l# G6 D6 Q8 y: G
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,8 n# X. a- e/ j! l/ n1 P+ [; w
;; and initialize the traffic lights to one setting
6 Z8 V( L6 v7 r, Y" J9 u6 yto setup-patches
' f) n/ c! M4 [1 j2 S ;; initialize the patch-owned variables and color the patches to a base-color$ N& d- Z* {! W7 ]/ p. f
ask patches; x- t% O2 d- Q: \
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set intersection? false) M ^* [% M1 M, ~
set auto? false
8 E$ u3 F& o7 W5 s: t: \ set green-light-up? true
/ I. ^3 ]7 w1 Z! {( N5 ^ set my-row -1
. x v D* O/ e7 a7 Z set my-column -1; I. `0 h+ o& ~* Y, j. t3 Z
set my-phase -1
) B7 @, }- Z9 u/ t1 e set pcolor brown + 37 h, L' G7 c' J. p9 s. P2 x- _: A
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;; initialize the global variables that hold patch agentsets
& a K* t& i$ Z/ ~ set roads patches with; K4 E% @- p: D* L) L& B* Z
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or# k; M5 P+ D% _ J6 N6 z3 l' e
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]/ \ u7 x; M, m9 j9 x; G
set intersections roads with
H* P2 K+ V5 ?' @2 E$ a' I [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and. `1 p5 w _$ L- s
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]1 I* ` e% t% y) ]5 | N
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ask roads [ set pcolor white ]
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9 y) v9 y2 h" F# Y1 G6 S) fend
0 U" b4 o: S3 d3 b6 k其中定义道路的句子,如下所示,是什么意思啊?8 Y' Z2 ]6 M& H& p
set roads patches with5 C+ P2 z' G' H I9 _5 P
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
3 y% Z+ H$ o. O2 U7 I (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
; K& l* Y3 Z7 W: e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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