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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 f, a8 g$ k# {) |
netlogo自带的social science--traffic grid这一例子当中,$ F" ^$ i$ ^ O6 {- e* T
globals
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( a) H" L7 P' {& m0 V grid-x-inc ;; the amount of patches in between two roads in the x direction @2 G8 }) `1 S' P1 @& `
grid-y-inc ;; the amount of patches in between two roads in the y direction! T4 w2 T, a- L9 e4 Y( n/ x0 l" a
acceleration ;; the constant that controls how much a car speeds up or slows down by if7 w9 p7 l. q o1 @1 Q1 r& c" c
;; it is to accelerate or decelerate
8 m `, d- i) N% W5 O5 l phase ;; keeps track of the phase
5 I, B ^4 j5 X/ {9 _4 B num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
2 j, h' r$ r( J f; v( ]! o' ?- G current-light ;; the currently selected light
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* g3 r7 d0 f& v3 v& E ;; patch agentsets5 k" g0 Z' o$ d; L7 `& T; @4 \ F
intersections ;; agentset containing the patches that are intersections6 V; q9 O `/ k" m+ `
roads ;; agentset containing the patches that are roads
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turtles-own2 o1 v/ S; i, @# j
[
: W8 }3 r% h% w) W, m9 `0 u speed ;; the speed of the turtle- [& J7 b# f8 D/ F
up-car? ;; true if the turtle moves downwards and false if it moves to the right" z+ R* J6 ]( p/ m/ I B$ n6 X& f# B& u
wait-time ;; the amount of time since the last time a turtle has moved$ d/ q$ g) u* ]% D" b2 `
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4 O7 k; P, ^- a, L# L* Spatches-own* t7 r) R9 d. t; ~" }9 h3 ]
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intersection? ;; true if the patch is at the intersection of two roads
4 {" x8 i+ p9 ~' K& U3 \2 m3 o green-light-up? ;; true if the green light is above the intersection. otherwise, false., w2 ~8 w. l- A, M
;; false for a non-intersection patches.9 e( Q2 M+ ]: ~4 M. h* q
my-row ;; the row of the intersection counting from the upper left corner of the
7 O) i' V% D) Y2 ?2 X% {$ I ;; world. -1 for non-intersection patches., V1 s+ V% A5 W: `* j# v. R
my-column ;; the column of the intersection counting from the upper left corner of the) j& B# G2 B$ x) H7 C
;; world. -1 for non-intersection patches.2 i6 g) g6 a) X
my-phase ;; the phase for the intersection. -1 for non-intersection patches.3 W) q; t* `6 a5 m) w* h9 s
auto? ;; whether or not this intersection will switch automatically.$ V( x$ F L$ J- u" @
;; false for non-intersection patches.5 ^- z7 y# v7 h9 ?
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9 T' H( |3 r N4 O! A: m& y;;;;;;;;;;;;;;;;;;;;;;
# K0 d: ~# s3 P; @;; Setup Procedures ;;
0 J, w. [% U$ c1 Y8 g% k6 E7 c;;;;;;;;;;;;;;;;;;;;;;1 O" K1 @$ S, H# q7 m a Z
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;; Initialize the display by giving the global and patch variables initial values.! O* r6 t g* V. Y- [. t2 |0 n6 y
;; Create num-cars of turtles if there are enough road patches for one turtle to
( a, M9 n& w. y& z! M; F;; be created per road patch. Set up the plots.' M" l/ r. N! |
to setup
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$ Q3 |: j2 J( C9 } setup-globals$ A: e3 _! I* D f1 e
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;; First we ask the patches to draw themselves and set up a few variables
1 t2 m) `: `3 F5 p# D setup-patches% }( \4 M1 f' S$ D# t7 a) Y+ j
make-current one-of intersections
6 a1 o! G, T, e6 j7 k% J O! i label-current6 h" z: e: E, R" K2 R
* E5 y- X% G/ K0 H. Y8 } set-default-shape turtles "car", x) E q1 d' {, q5 j" d8 X/ \
, X- B; ^1 Y5 I' r( _ W if (num-cars > count roads)
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- {8 q ~8 k. y8 u% b* W$ a user-message (word "There are too many cars for the amount of "
! i* f' D7 U) e8 u1 w8 ?) r "road. Either increase the amount of roads "
8 H1 P9 }) A% W7 H* U "by increasing the GRID-SIZE-X or " O! V! _/ h& B) c2 r J0 B
"GRID-SIZE-Y sliders, or decrease the "
9 R0 l" @+ N/ L4 O2 N2 n e) V "number of cars by lowering the NUMBER slider.\n"6 @1 _$ p. n2 R$ y& t
"The setup has stopped.")% P7 U" |4 S; I& q, a( A$ m, \# e U+ J
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
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setup-cars, m1 J# ]- K$ ]4 e( _. }
set-car-color
8 X2 v3 v& b: _- y6 Q5 n' g record-data
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;; give the turtles an initial speed
, `' A! F5 j3 \6 U5 b. T" [4 F ask turtles [ set-car-speed ]
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m* u* |3 k2 F5 x5 q0 T reset-ticks& d! O! U/ Z; t3 G
end
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;; Initialize the global variables to appropriate values
# @& l% P- @ Y+ b- Oto setup-globals* O8 j. m/ k- X) D* h7 y* \' o
set current-light nobody ;; just for now, since there are no lights yet6 ^7 x8 M0 V% \: ]: c% X
set phase 0) ?; w0 F; t. x1 C! \
set num-cars-stopped 0
3 z9 O* _3 n/ h% k set grid-x-inc world-width / grid-size-x
5 V5 A9 M; a5 X set grid-y-inc world-height / grid-size-y7 u% Y2 i9 n+ k$ A3 j5 G
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary8 F! W$ g0 W2 k' c8 T
set acceleration 0.099+ z6 o# f2 J6 }
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
, `, I, W% u- |) y;; and initialize the traffic lights to one setting
8 G* w7 | U: K; T5 l5 }/ {to setup-patches& B, z* ]6 x4 m/ `9 `9 ^5 f& b
;; initialize the patch-owned variables and color the patches to a base-color3 V) P7 ~ C! E3 v1 m+ X
ask patches
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set intersection? false
x& H, d+ H$ v8 D* i set auto? false8 P" e6 `% S: ]: i7 Q, ~
set green-light-up? true" o' y" }3 V0 B7 [
set my-row -1
" x. b+ i5 L. ^3 k/ Q( S2 W3 N0 g set my-column -1
, X5 G6 T+ J" j# L set my-phase -1& G# e% ~% Z; V0 a U* B
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
3 m# o; d4 c9 l' Q set roads patches with
+ x. ^* J$ u5 x# E2 X2 s [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or! Y2 N( p; q$ [4 H- G
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]2 C0 F5 K* ` K9 A
set intersections roads with
_9 a a: ^- o4 j; o% M [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
! h' f6 J$ g5 Z) [. p; r (floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 q, v: o4 [$ K+ [+ r5 ?& {3 d& G
Z7 p& a1 c* v; m9 H5 Z- }; i- r- U. L: @ ask roads [ set pcolor white ]; k- @: Z2 W4 z
setup-intersections
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; K( J6 [/ g3 {5 D7 z Z其中定义道路的句子,如下所示,是什么意思啊?
7 u; E0 g8 j* q& D; A/ R. ` E0 c set roads patches with
0 J4 p! n5 {9 u* Y [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or W1 e1 u; Q( k( {
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
7 ~. c1 `4 L2 [/ n6 ~3 ?- j( M$ q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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