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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。
# F# j1 |8 i1 ^ m) Knetlogo自带的social science--traffic grid这一例子当中,% e( L0 R& t; @' l
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4 H; n& O* a$ J* z$ y grid-x-inc ;; the amount of patches in between two roads in the x direction
9 N& m3 i* o7 h4 }! U' `4 q9 s grid-y-inc ;; the amount of patches in between two roads in the y direction
" P* G! S# M0 d acceleration ;; the constant that controls how much a car speeds up or slows down by if* c T4 `* A$ R, p3 E% n7 S4 J- z
;; it is to accelerate or decelerate
: J- N9 z, L: X" ~& t k, A- \ phase ;; keeps track of the phase
' \8 w2 D/ @! ]5 M num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
0 P C( `" a7 s3 w current-light ;; the currently selected light& q/ z6 g/ n; x) C+ D/ P
Q7 C4 q! f" M1 } ;; patch agentsets, J( C; v2 s3 u2 A
intersections ;; agentset containing the patches that are intersections
! B& k" r+ ]* \# o# J" A4 \ roads ;; agentset containing the patches that are roads0 a* Z7 k Y$ t3 o
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turtles-own
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- _6 b& Z5 ~7 H) x# n speed ;; the speed of the turtle
% G' B8 G/ h9 ?9 v0 G5 u up-car? ;; true if the turtle moves downwards and false if it moves to the right
9 ^* e! h( r! N; f: z/ S! ^& w wait-time ;; the amount of time since the last time a turtle has moved
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patches-own# f$ s, K8 M+ \6 ]1 M) Z1 Z
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intersection? ;; true if the patch is at the intersection of two roads
% R# @, E& X9 H4 q7 k: H; F0 P green-light-up? ;; true if the green light is above the intersection. otherwise, false.
+ |9 T+ k7 W4 l& q: `; |" z ;; false for a non-intersection patches.: |: v9 Z, J7 L. `9 l
my-row ;; the row of the intersection counting from the upper left corner of the; q3 o ?) L4 x) c
;; world. -1 for non-intersection patches.! |* |- e. l, d' w3 D, [0 g
my-column ;; the column of the intersection counting from the upper left corner of the
! L: S# X! `. _+ B# o A/ F ;; world. -1 for non-intersection patches.( J6 H3 Q6 H; w; S0 v
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
( Z& X9 k; {5 a& M( a; B$ b; X) b auto? ;; whether or not this intersection will switch automatically.1 C) ~7 _1 o1 b1 K5 \/ r
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;1 ]# E5 `: \9 w7 \3 B1 X: o
;; Setup Procedures ;;
4 _3 N* s2 F! W) C;;;;;;;;;;;;;;;;;;;;;;
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8 n( ^0 @) \, Y. i, p* Q4 G: w3 r;; Initialize the display by giving the global and patch variables initial values.* ^1 Q/ M" C1 ]3 y0 }
;; Create num-cars of turtles if there are enough road patches for one turtle to7 W7 E2 D6 k/ r: J5 c3 _1 e
;; be created per road patch. Set up the plots.6 j% w& }5 r+ j0 P8 _, O
to setup
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setup-globals
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) [- Y0 j- Z2 V' l6 H ;; First we ask the patches to draw themselves and set up a few variables% {+ y% s. R2 C5 h& `
setup-patches
k! |* @/ }7 W2 D7 F$ v make-current one-of intersections$ X1 X# W, i1 h( [ u( C3 \
label-current
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; q R6 j1 _+ ^% p set-default-shape turtles "car" a, _6 h# b0 f
" A/ v1 {" h! w3 v0 H" B if (num-cars > count roads): s2 W4 u5 M! j0 E9 t- ~" t
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# s: L( [+ v& n user-message (word "There are too many cars for the amount of "
7 t! ]9 q. w, G N "road. Either increase the amount of roads ") C3 {8 r! p4 `, ?% b& k9 E
"by increasing the GRID-SIZE-X or "
4 }, Y7 W* J2 D% H4 j* { "GRID-SIZE-Y sliders, or decrease the "
! l) k' i+ t. {- x0 ^. u "number of cars by lowering the NUMBER slider.\n" Y" V9 }) c$ b% ~+ ~; Y+ }
"The setup has stopped.")
9 }$ N/ l }9 S! r5 e1 ]8 [5 a8 N stop
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- y4 A4 N, ~9 R! y ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color$ x1 c% V7 X" k: W' Z
crt num-cars
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setup-cars
5 A8 z* I" B' R% _; f6 \ set-car-color- @% ^+ ?2 U$ f" A
record-data% R( W, h# s7 J1 v1 I) L) o8 R
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3 r9 I* ^8 F. R% w8 y: M+ H$ U ;; give the turtles an initial speed" Z7 X6 t) c! u. q
ask turtles [ set-car-speed ]4 e* H! D) P% q; o8 i
0 }5 W; a Z; S5 s) L8 {1 D8 W reset-ticks
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4 t! t) V* h# O, @9 p;; Initialize the global variables to appropriate values
4 D& X9 _: t1 k) e8 X% fto setup-globals$ r/ n6 z9 `, G1 [; g
set current-light nobody ;; just for now, since there are no lights yet2 u4 v: Y+ N+ F9 K P: q
set phase 0
& J% A9 k# _. g set num-cars-stopped 0
8 V7 w5 i% a7 n) W5 n set grid-x-inc world-width / grid-size-x6 w# U: n' C: j7 J! a# d& _
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. Q/ Q! t, j0 y" b; P, I" V
set acceleration 0.099
& x1 a' v4 ~$ r5 `end3 h# |& e8 N5 x, H
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
! `3 p+ a: W+ l( ^4 C( K/ `;; and initialize the traffic lights to one setting9 S- i/ P* W1 h% Y" ^7 a' P
to setup-patches/ H% j0 [, {8 t+ T# b n" ~+ \
;; initialize the patch-owned variables and color the patches to a base-color
' W7 P9 ^& H K' C ask patches
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set intersection? false4 x: m) g5 n: F6 m3 r+ m! ?
set auto? false
0 i4 J9 l2 @ h* t( ?$ _+ }4 j0 y) N set green-light-up? true
" S y9 {3 z+ g" F, v# U) Z* m. k. Q set my-row -1
8 u; a; F$ n# @* V3 J set my-column -17 J) |0 {/ [$ L# O5 ]
set my-phase -11 L7 H4 q' T$ U7 l- t2 Y; c
set pcolor brown + 3/ W: C: O( _/ Q/ u" b) m
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( I) L* t: G9 k7 X ;; initialize the global variables that hold patch agentsets; O5 ^5 x0 i" ~
set roads patches with
! t8 X1 y* O' Y+ \" _9 g# `! I4 W [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or& s R, Z% c5 Y0 j9 S: g8 ^
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]* M" t* d. @, r) u$ f
set intersections roads with
% ~2 [4 y6 [4 G [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
7 s$ w1 n( C# f8 x: L (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
" h. Q5 K8 R' I: \" y' ?0 c setup-intersections
5 x3 J6 s! g' n+ `$ Y8 ^$ Hend
9 C& z- Z7 x+ w* F5 M其中定义道路的句子,如下所示,是什么意思啊?0 d0 ^# a8 m9 F. G/ H) B5 h
set roads patches with
5 ?$ F! G3 Y# U3 O! n. v4 s/ [ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or$ ?8 g7 F. k3 {2 F
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
2 R/ J9 U" r. b( z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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