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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。) I% |+ v1 r( `8 P
netlogo自带的social science--traffic grid这一例子当中,
- ?! B, d- J7 O$ ^globals
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1 J- A+ ?9 n2 P5 U# J, ~ grid-x-inc ;; the amount of patches in between two roads in the x direction2 @ C' S& `' G2 k" Z
grid-y-inc ;; the amount of patches in between two roads in the y direction
" K4 \- n2 E2 P9 \6 Z+ ~( e: n acceleration ;; the constant that controls how much a car speeds up or slows down by if/ d$ y% S- e) U/ V3 z+ O$ ~& z
;; it is to accelerate or decelerate
: g" v* [; H2 F) U% L' U0 a+ W$ s phase ;; keeps track of the phase
% n G3 S& l2 l: Y. R: M& B; v; R num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure% w, H6 R* ^' P! H/ D
current-light ;; the currently selected light- l5 ^7 l7 W b. W/ b& L
( D& a- U) E4 G7 H' f6 \" h! K ;; patch agentsets
: }4 w) Y7 l. K: S+ ~& ?; q intersections ;; agentset containing the patches that are intersections
9 v9 d7 H2 I; a" ~. N roads ;; agentset containing the patches that are roads u% z' e' J* [, j
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turtles-own
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$ v* l: T$ P* l) s8 x) H speed ;; the speed of the turtle
1 @. P2 M. [* `; q5 b up-car? ;; true if the turtle moves downwards and false if it moves to the right9 B" e5 Z# Q. h" f* h" H
wait-time ;; the amount of time since the last time a turtle has moved
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" S3 }! y: E( A9 V/ v+ Qpatches-own
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* G. ^! [3 G7 v7 A1 @ intersection? ;; true if the patch is at the intersection of two roads& `# P/ P8 A% f g
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
* K3 m& D( {! t ;; false for a non-intersection patches.$ D7 B5 F d; C2 \+ T. n, `& d0 x
my-row ;; the row of the intersection counting from the upper left corner of the5 Z" ^# e) r9 V) ^1 L& X Q, m
;; world. -1 for non-intersection patches.
9 C; ]! z5 P& B my-column ;; the column of the intersection counting from the upper left corner of the. q8 I3 Y; _8 c' c& \; ~
;; world. -1 for non-intersection patches.
9 G1 J, z w$ ~! t0 w my-phase ;; the phase for the intersection. -1 for non-intersection patches.* Z# B& R, Q# A i' T
auto? ;; whether or not this intersection will switch automatically." C- g1 j+ @, |2 z
;; false for non-intersection patches.+ ^; Y' P" E; |+ C w, y; ]! `% b
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;;;;;;;;;;;;;;;;;;;;;;
( d; G/ \+ C2 k/ F" l;; Setup Procedures ;;
( L7 ` Z' U, l$ [* S; I6 P) k;;;;;;;;;;;;;;;;;;;;;;( y" W, s, F1 Z5 o
' @/ [! t6 Y# \- N5 L) u;; Initialize the display by giving the global and patch variables initial values.
* _' E/ s5 l" B3 o: L;; Create num-cars of turtles if there are enough road patches for one turtle to
) b, P: A1 c( P% I& D) };; be created per road patch. Set up the plots.0 E+ ~' V# \! {4 K
to setup* v& Z7 K( m' l6 f, ^$ o) O% c
ca
( f9 z, X, S; l* x5 }2 h4 }9 f setup-globals
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;; First we ask the patches to draw themselves and set up a few variables
) R4 O" x, v7 Z3 E* S& C4 l setup-patches% q0 s; i3 W) ~# M7 {" P! Q
make-current one-of intersections
2 y7 T Y' J. W/ [. n5 x label-current
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set-default-shape turtles "car"
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! f: u0 h; U0 K' c7 N6 U if (num-cars > count roads)
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, K5 W/ @0 Z1 ?) { user-message (word "There are too many cars for the amount of "* \- I: x$ c: o" Y
"road. Either increase the amount of roads "
0 o$ m0 q( W) R+ K "by increasing the GRID-SIZE-X or "
! G# ~, ~* X) @$ b2 O "GRID-SIZE-Y sliders, or decrease the ". M& y8 { I; l
"number of cars by lowering the NUMBER slider.\n"; ]8 C# u4 D& a5 W+ K
"The setup has stopped.")7 w$ K: _' F+ b; P7 O. u @
stop# _/ H# j6 R; J9 r' _ q; Q' R
]
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& `/ a( l8 V* ]- N! v3 I! d ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color6 V$ D G4 H- P9 g |* H
crt num-cars
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3 N/ o0 ~0 ~3 q/ E+ B, m setup-cars) {& f: ?8 s- T9 C$ E# D
set-car-color# e5 {) q* W' J1 ^& o# Y
record-data
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3 m( _/ g* L- r1 V3 g ;; give the turtles an initial speed
& X0 _9 F# n3 Z( w/ ]5 w6 Z u ask turtles [ set-car-speed ]0 i7 o) a6 V3 I8 f" A7 `7 L) X/ G
. P, i/ n% j5 }7 P8 V+ g% V reset-ticks
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0 J+ T& f0 y/ m0 F. R$ V7 K, {' `; m;; Initialize the global variables to appropriate values
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6 M+ {0 {4 n* F! ^ set current-light nobody ;; just for now, since there are no lights yet' _0 g4 u4 t6 b( W! z$ A4 A$ j
set phase 0) D% }% H: l% r+ Q9 O; g; [
set num-cars-stopped 0
% f+ _: ^ u7 r% G, q# Q set grid-x-inc world-width / grid-size-x6 Z' u; c B/ S4 M1 ~
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
Z: H, o3 M; m9 m set acceleration 0.099* ` n: J# z6 _/ b6 E, u
end! [; }8 |4 x% q5 ]/ M! `# ?0 M
( U, O" G/ e& \+ i! B4 ^2 f" Y; y;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
; O& x, j: I, K" D) |5 m;; and initialize the traffic lights to one setting
/ J$ x/ K! s( Qto setup-patches/ r9 Y) k1 L; @5 `* |) f& Y% m$ {' B
;; initialize the patch-owned variables and color the patches to a base-color
O" N7 Y$ o1 m/ y ask patches2 t2 B0 {2 |5 }; S4 s" |0 o# T
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set intersection? false
$ z) T$ I- R* O' f. h# M* d set auto? false/ C( Y3 b9 R* H" {
set green-light-up? true
0 W1 G/ E% ^/ c R- ?8 g/ e set my-row -1
/ _8 P6 k. n" p/ u. Z2 a7 v set my-column -1
3 A- a* A; d2 f. U" q% \( ~ set my-phase -1
Q1 l8 C0 p+ G8 a0 H( b6 \ set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
0 P& t/ V% i. E! P( Z- l( q) A set roads patches with
* I t% j: P$ ]( L3 D8 ~ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or9 c: l1 T R, D* Y2 h9 M4 `8 ^
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
" b, m/ j6 r1 x0 ~. d) r, P set intersections roads with
* t9 P9 }& G* ?: Y6 D. f [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
1 e/ G: j; p9 u, C/ ] (floor((pycor + max-pycor) mod grid-y-inc) = 0)]& {. r. W! J9 `: H9 \ `
( }8 U; W* r3 W3 A, Q ask roads [ set pcolor white ]+ h, _2 M0 m" U. e$ E
setup-intersections
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其中定义道路的句子,如下所示,是什么意思啊?1 c( o/ }4 [4 {( C+ N+ Q; Z9 O
set roads patches with# Y3 M6 H/ S3 Y- }0 B# c
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
5 S# B- _* a4 @ t- L& ]- c9 }+ s$ k (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
7 b) E1 ]' `$ l, C& U/ d/ J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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