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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. H" T5 n, [2 dnetlogo自带的social science--traffic grid这一例子当中,
7 {4 s$ F5 p1 [, Zglobals. @& `, T# o* P8 c R2 C4 J0 k
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grid-x-inc ;; the amount of patches in between two roads in the x direction
# F8 `) @ a) _; k grid-y-inc ;; the amount of patches in between two roads in the y direction. `) T7 h1 ~0 x }) ~
acceleration ;; the constant that controls how much a car speeds up or slows down by if
# M' V( y2 d8 H) {) U ;; it is to accelerate or decelerate) A+ _: F. v* _2 K1 D* N( _2 L
phase ;; keeps track of the phase6 w' }7 }! Y; `5 D
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
5 t6 _9 z; Q p4 R" ~; @( O current-light ;; the currently selected light
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" w- p4 t& @) d& V% K5 l5 }8 c ;; patch agentsets
9 I0 A" K7 A" t: A intersections ;; agentset containing the patches that are intersections
" b/ u! m. h, ?/ q& g9 U+ @ Q roads ;; agentset containing the patches that are roads
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9 W* u! ` u0 q: U; Nturtles-own9 ~/ G- |5 ?% l' c; |: ]/ ^( H
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speed ;; the speed of the turtle$ ]: w4 x# P B1 @- E3 L( F
up-car? ;; true if the turtle moves downwards and false if it moves to the right/ u& s( W3 S5 f
wait-time ;; the amount of time since the last time a turtle has moved) i `6 b( W. j3 [! \3 n2 C
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patches-own
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intersection? ;; true if the patch is at the intersection of two roads
* @% U( I% D. d* h! L2 [% E green-light-up? ;; true if the green light is above the intersection. otherwise, false.
6 g4 x) t1 ^1 e% E$ \9 h( u ;; false for a non-intersection patches.
% a, e% J5 u% x, Y# K5 o4 w* Q my-row ;; the row of the intersection counting from the upper left corner of the
# r4 ?$ W/ Z. L. J ;; world. -1 for non-intersection patches.
. W" u. l4 P4 p7 l9 Y. u- \ my-column ;; the column of the intersection counting from the upper left corner of the. ~0 S) c6 b8 r1 U# O' d8 J" R
;; world. -1 for non-intersection patches.
+ [, Z& q" ?( }8 {3 Y my-phase ;; the phase for the intersection. -1 for non-intersection patches.
! n/ ]- v+ |& ` auto? ;; whether or not this intersection will switch automatically.
4 a' ], j! r* z7 P ;; false for non-intersection patches.) ?2 ]8 U8 c! s; k
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2 E7 C9 w/ y1 v) f6 n% d;;;;;;;;;;;;;;;;;;;;;;
) }9 m# `% ]4 }. ^$ C- g1 D% |4 p. `, o;; Setup Procedures ;;
- v; X2 O" O+ Z$ g;;;;;;;;;;;;;;;;;;;;;;3 Z- U6 ]* {5 r) _: s7 u' B6 u3 k
. O/ v$ |- U8 o, f u/ o# Q- N+ @+ l;; Initialize the display by giving the global and patch variables initial values.7 R) Y9 a6 x- ?, Q5 Q) w; Q
;; Create num-cars of turtles if there are enough road patches for one turtle to, L/ e3 K$ }; Q' Z e$ i7 Y
;; be created per road patch. Set up the plots." N" M) e* W: n. i
to setup
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setup-globals( V1 l6 E' k; }1 K1 I' Z" ~! K
. g4 o: x0 k; ^ ;; First we ask the patches to draw themselves and set up a few variables9 B4 n% E4 r9 v- J/ T
setup-patches
3 C: _- w" L D( u& i make-current one-of intersections
$ A v5 M3 N, S3 b7 U. l label-current% u0 r$ W- N3 B: F! a! q
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set-default-shape turtles "car"
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" ]7 D2 a5 w7 V5 X; P4 \/ u if (num-cars > count roads)
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; a! |) b# a. [ user-message (word "There are too many cars for the amount of "
, _) {" L8 O% ]% h+ g% y* x2 c2 ? "road. Either increase the amount of roads "
/ C4 U6 p& Z7 `- J+ Q- d# o5 \; l2 m "by increasing the GRID-SIZE-X or "
$ y- o! t* | A2 ] "GRID-SIZE-Y sliders, or decrease the "+ V' |3 w' s+ }5 k: l
"number of cars by lowering the NUMBER slider.\n"/ I1 y+ |- d( D4 b
"The setup has stopped.")/ H' W- f9 ^' a, J$ J/ n
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color- h) U- z8 W" F% u
crt num-cars
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7 C$ m! P2 g" K" L0 P& V setup-cars2 t3 B3 h' ?2 B9 C8 d; j
set-car-color1 c8 ?' ^1 l% ^1 e
record-data0 x6 c8 w9 X9 @7 {3 A9 a
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2 n2 Q; H# C9 t1 P; `2 M3 q ;; give the turtles an initial speed& w1 p9 f) N6 T
ask turtles [ set-car-speed ]4 E3 y( b- a g- b
, {3 ~& B5 ~7 x reset-ticks
' O3 l5 J, O! o$ N& Cend
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8 c5 h; Y; V' c6 k4 R, _ ]1 L! \1 L;; Initialize the global variables to appropriate values
0 K% p6 v% x1 l9 l) y' nto setup-globals n9 S, \, A; S E
set current-light nobody ;; just for now, since there are no lights yet
& j* t* m) X- l& X set phase 0: Y' B' Y8 y3 Q. o% T
set num-cars-stopped 07 S' s$ I% B- K; T( H
set grid-x-inc world-width / grid-size-x5 `# x, ?) d/ x# ]0 Z0 R
set grid-y-inc world-height / grid-size-y0 g( j' E) `8 o4 C) y8 y q
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
. ~$ Z+ J6 {* ^4 x set acceleration 0.099
" q# k |: ^5 |end
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$ ]3 W& v9 Z8 _7 q* g- r- \2 c" J/ R;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
4 h4 U+ \& d- O* f' r0 b) w' C8 T;; and initialize the traffic lights to one setting
4 J# M1 ?; k. l+ Jto setup-patches
; U8 @4 U% A+ I8 h5 z ;; initialize the patch-owned variables and color the patches to a base-color
+ z) i& E, }8 x0 H, ?5 u1 ~7 E- ] ask patches' S6 j) @! ~+ ? C( o) R7 w
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set intersection? false2 J- t/ b8 P" f' Z& V8 T
set auto? false& ^% p* T- {3 z! _
set green-light-up? true
8 M" z* R# y# m! C2 T o set my-row -1
0 w+ b6 {: I1 H" D' w. g set my-column -1
! o6 H6 I( K H" h6 q1 z9 }: N set my-phase -19 L4 G+ W6 K( [) o. k+ {8 S4 Z) ^" E
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets' t# M2 V1 h2 _( ?' |
set roads patches with( n( G7 v- l) w) {' f" E# x
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or8 S& q* s, z1 U3 T' {6 w) g
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
2 s/ k$ x4 k8 r& v# U( p2 x w* g7 w set intersections roads with5 Q* n' K& B$ \: R G2 o! q
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
- B8 d* s" w2 _ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]+ T4 | ]& ~9 _- r2 F
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ask roads [ set pcolor white ]
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end& I0 I, y( a7 f& T8 x! F% \( h
其中定义道路的句子,如下所示,是什么意思啊?. a; s8 w" w1 e- w" q
set roads patches with
1 x# D* @0 d3 ^& W$ U7 O3 F [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or: R4 X" L: `1 Q: w
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 E- {( @( }0 G" h% z& E) R8 O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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