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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。
# r; y" p" ? y A" L# @netlogo自带的social science--traffic grid这一例子当中,
8 v% S; ]7 f! d5 w! jglobals/ ]) X) Z$ G9 V S3 K P& `9 _! _
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grid-x-inc ;; the amount of patches in between two roads in the x direction; e7 j6 Y5 {3 _$ u9 S4 ^7 |/ l2 @
grid-y-inc ;; the amount of patches in between two roads in the y direction: O5 l+ f |% b$ q) _3 K; }. G# `
acceleration ;; the constant that controls how much a car speeds up or slows down by if, E: D% x0 v* z* [ _" M6 {4 V- u5 R9 \
;; it is to accelerate or decelerate
' n& T2 l4 j( C6 W; X' ?, o; u phase ;; keeps track of the phase
, C# h% a$ a6 j3 _ num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure% w/ @3 p b: v. G# P
current-light ;; the currently selected light
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;; patch agentsets# J2 |4 t; i! Y* I$ R
intersections ;; agentset containing the patches that are intersections
9 P; p+ `9 C- e+ \1 p roads ;; agentset containing the patches that are roads
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3 S3 w* Z% O- |turtles-own
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/ z. m" i" w, t% ]1 O- g$ S F3 ]3 t speed ;; the speed of the turtle
7 X, |6 t8 ^4 g& f7 w- {" w4 z3 a up-car? ;; true if the turtle moves downwards and false if it moves to the right* b, `1 l5 S, o, [
wait-time ;; the amount of time since the last time a turtle has moved0 g/ \% d/ w% y k6 D: p( C
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patches-own8 c" i& ^2 x0 l; X9 F* B
[
' t6 K9 k0 Y2 U7 F2 J intersection? ;; true if the patch is at the intersection of two roads
) b1 E/ F) l3 ~# H green-light-up? ;; true if the green light is above the intersection. otherwise, false.6 X2 |* v0 A1 a: a7 }
;; false for a non-intersection patches.
" H1 e3 f* h7 ^) G; F+ v- } my-row ;; the row of the intersection counting from the upper left corner of the
3 A! D8 e2 g# L2 R4 k$ X ;; world. -1 for non-intersection patches.
$ f: C( _ y s7 t# L! t9 y my-column ;; the column of the intersection counting from the upper left corner of the$ K- B- D0 ~& a; _* f! h, k
;; world. -1 for non-intersection patches.
+ i, s9 ~+ d9 ]/ J# j1 F8 N my-phase ;; the phase for the intersection. -1 for non-intersection patches., m9 F. O! Y% [$ r
auto? ;; whether or not this intersection will switch automatically.
0 b8 q1 c' A* F ;; false for non-intersection patches.
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2 J) m g: C; \( i% Z;;;;;;;;;;;;;;;;;;;;;;
- A$ H8 O6 e2 r4 `;; Setup Procedures ;;
- S8 a' @# I c j4 n. Q5 @;;;;;;;;;;;;;;;;;;;;;;8 o* K$ C- _" W
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;; Initialize the display by giving the global and patch variables initial values.
) m% ?, F1 s' E8 G7 i;; Create num-cars of turtles if there are enough road patches for one turtle to
( S: B) x9 V- \1 U;; be created per road patch. Set up the plots.
8 M4 E5 `' B7 `, f5 |to setup' T6 d5 K2 R( [
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setup-globals) j- N* h& @0 W& ^! D( U% O! e
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;; First we ask the patches to draw themselves and set up a few variables8 X+ G% E1 r+ V1 d; v( k, B; @
setup-patches
: v) [) ^) D6 f make-current one-of intersections
, f7 F9 ^2 h* P2 l5 r D- Y x/ Z label-current
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6 z1 W1 f' p! |( |! |* z set-default-shape turtles "car"
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. P( \$ S7 U7 \9 K: `8 x if (num-cars > count roads)
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. D# ~$ c5 y- C user-message (word "There are too many cars for the amount of "
$ X* }4 W, R9 p& X/ z% v* U& l& [0 | "road. Either increase the amount of roads "
" F; G& A/ z3 ?. B$ k6 ? "by increasing the GRID-SIZE-X or "
4 r+ S* g; v0 y. P, s$ F9 s$ B% s "GRID-SIZE-Y sliders, or decrease the "; d( c k9 @2 {: _
"number of cars by lowering the NUMBER slider.\n"
* [1 F; z5 u* X% u4 Y$ W "The setup has stopped.") o, F2 |7 L" G- D4 G/ c
stop
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* o. Z8 Y: [: t, r+ {$ y9 z e( ^ ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
* g* s0 D% Y% L5 z- a& l crt num-cars, Y& r/ J- M. N, W0 w t
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setup-cars
- Q) \/ A: Y; B! @0 ] M8 A set-car-color
5 [. G6 c* S% B" L record-data% i2 U4 q+ G9 E
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;; give the turtles an initial speed$ h2 z% f1 \5 S6 z. }
ask turtles [ set-car-speed ]
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reset-ticks
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;; Initialize the global variables to appropriate values
) ]7 p& a+ C, {) R. Fto setup-globals, {) T6 B" p3 }: g3 W! W% X, f1 j
set current-light nobody ;; just for now, since there are no lights yet0 t- J% f) D% m s4 V! \
set phase 03 F* D( L- C# F
set num-cars-stopped 0
9 |2 s( I: s$ s set grid-x-inc world-width / grid-size-x/ w0 b3 R2 W. J) p, _! j. c, G
set grid-y-inc world-height / grid-size-y
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4 o1 r( ]' {7 p; F; F. F6 j$ w x ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
1 v$ x) C: S' F. A set acceleration 0.099
% P7 v: ?+ V7 r5 ^1 L+ Oend
( ]" P8 d# ~# q% L; k s: S
" j6 |7 b) g9 m# Q/ V/ F( `( q! U;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
7 b' y+ C5 ?9 F7 i* h;; and initialize the traffic lights to one setting1 ]' Q( `- w$ W; i
to setup-patches8 B. {- R# o0 u; c* n5 _$ W
;; initialize the patch-owned variables and color the patches to a base-color
" T k1 o I1 f& P+ J3 s3 p ask patches2 \1 N% w, o# q
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set intersection? false
: o, m1 ?/ m1 i1 m& s9 J set auto? false, x2 \9 d' [: w" q
set green-light-up? true
! M3 y8 Q8 |, k+ p x set my-row -1, I1 ]9 h* f$ Y$ s0 h3 J1 {( t
set my-column -11 o! ~: m- D3 c4 @- g
set my-phase -1
# k& F& _' _4 M. \. w set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
n; S2 d1 F6 \. a# j set roads patches with
- D: I" g1 v+ m [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
! l2 U5 @6 B3 V2 b' z/ | (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 R1 L, X- m* ^. H7 A7 }4 o4 { set intersections roads with
* y' @- w* D' V% o @# z [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and* @" x% y& S+ \+ ?: A# W: K
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]' u& f& ?" U% R5 ?3 _- T5 c7 j
setup-intersections2 a. c" y# J" i8 k$ q
end
5 n9 r# n( {6 B其中定义道路的句子,如下所示,是什么意思啊?
( d% L4 H4 U. _* Z( n" V+ O/ r( z5 z set roads patches with1 d. B5 G2 ]2 R9 B; B
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or. i/ V5 ? d( f/ @4 {- L* U1 @, e
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
# R3 r8 e/ r. I9 ^- ~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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