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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。0 F& d! c8 K- `! R2 f$ M
netlogo自带的social science--traffic grid这一例子当中,
2 D w3 | R2 R# h. g9 v: P' J) gglobals
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grid-x-inc ;; the amount of patches in between two roads in the x direction, u3 V* J: r+ Y6 H2 Y; {
grid-y-inc ;; the amount of patches in between two roads in the y direction( S2 S% _; e4 I4 c/ C m, z) N2 n! C
acceleration ;; the constant that controls how much a car speeds up or slows down by if
, n( P/ B( g3 [1 p! j$ ` ;; it is to accelerate or decelerate
9 k c3 D+ i- t5 d4 q phase ;; keeps track of the phase# n ^) H( s' P& C3 t2 D
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure+ G* d8 e0 S7 `! H$ P1 p2 P# _
current-light ;; the currently selected light
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;; patch agentsets$ p0 N* h$ K6 s4 r
intersections ;; agentset containing the patches that are intersections
( X" |6 `9 a, L; z* p' X; h2 ^ roads ;; agentset containing the patches that are roads
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turtles-own
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speed ;; the speed of the turtle& s4 | I# t# N2 ^9 e3 F+ e
up-car? ;; true if the turtle moves downwards and false if it moves to the right8 _+ \) h0 X: @' r) Y
wait-time ;; the amount of time since the last time a turtle has moved
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6 F J; n/ Q8 b1 e9 g2 k# lpatches-own
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intersection? ;; true if the patch is at the intersection of two roads
8 r% P& X( e* d4 L5 s green-light-up? ;; true if the green light is above the intersection. otherwise, false.
2 m( l8 w4 ~6 s1 \. w% |8 N6 u T ;; false for a non-intersection patches.
) l3 H( A- w0 R2 x/ X0 { my-row ;; the row of the intersection counting from the upper left corner of the' c% x( |' c% f, ~0 V1 N' J6 ^
;; world. -1 for non-intersection patches.. H1 ?9 O. x" j- H
my-column ;; the column of the intersection counting from the upper left corner of the$ J7 Q7 M# _$ ^
;; world. -1 for non-intersection patches.- [! y/ V+ i& V6 N% g: W+ e* f
my-phase ;; the phase for the intersection. -1 for non-intersection patches.9 r+ W4 |: \# Z- m" H: e
auto? ;; whether or not this intersection will switch automatically.- \( @0 D. D# A+ q
;; false for non-intersection patches.
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3 j3 O' Q5 ~5 C* I1 [;;;;;;;;;;;;;;;;;;;;;;
, I$ _1 V% |: O;; Setup Procedures ;;
# {8 \1 [: Q1 _/ O2 @, N;;;;;;;;;;;;;;;;;;;;;;( V. [( C5 U) v# U) l5 v+ L
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;; Initialize the display by giving the global and patch variables initial values.8 c: e4 t @# s, h7 F, W
;; Create num-cars of turtles if there are enough road patches for one turtle to
' u8 i2 E( }' X- `! }% ]+ j;; be created per road patch. Set up the plots.; W# O4 Y2 U# }/ U
to setup+ `9 F, J* w8 a* D/ j4 o! h5 m
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setup-globals: L W4 a0 |" W! y, B: O
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;; First we ask the patches to draw themselves and set up a few variables
4 v( l: y2 {9 v/ Q1 f, A setup-patches
3 I! `5 t/ @6 [: g) l; S make-current one-of intersections
! p1 [ r- M; L0 J5 I8 K8 a label-current
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% @3 E* r2 {) h4 l B5 B( U& l set-default-shape turtles "car"
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if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "4 b8 r6 n- V) s: p
"road. Either increase the amount of roads "
- r' D! f; n1 s8 c3 ]% U9 E "by increasing the GRID-SIZE-X or "$ H' X0 |$ D" Y& I& p! j
"GRID-SIZE-Y sliders, or decrease the "
9 ^6 a1 ]; t7 V! h% P$ u6 F "number of cars by lowering the NUMBER slider.\n"
- o/ d5 ^' Y' c& N r" X) o "The setup has stopped.")3 m, ~! w6 m4 f6 I: H6 [
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color6 s1 J' Q' ] Z8 G
crt num-cars
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6 N# a4 J4 D8 ?& f% _+ | setup-cars
: B# q) F, u% M set-car-color
* g. H- m$ |) X/ ?, h record-data
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;; give the turtles an initial speed
! }1 `0 q6 v* r1 k2 l$ S ask turtles [ set-car-speed ]! Y1 x' b/ Y& Q; h4 Q
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reset-ticks
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;; Initialize the global variables to appropriate values7 U, n" [& N% A0 G6 `
to setup-globals
& n: k0 u U. x# E5 g1 i3 r0 J% b set current-light nobody ;; just for now, since there are no lights yet
0 {6 P; o. S( I; J0 _ set phase 0. h9 g8 S) h8 B! `) P
set num-cars-stopped 08 u- e4 k! C, `8 p
set grid-x-inc world-width / grid-size-x/ o9 k$ q6 a9 t3 B! r* I/ V
set grid-y-inc world-height / grid-size-y
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+ V- v' m- b9 s/ V4 t, ]( l ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
: b- `/ w/ t4 p1 h) L set acceleration 0.0999 a+ R1 D! @; C& [7 e% R% K! A4 w
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
4 |! T: u w v; O;; and initialize the traffic lights to one setting0 [/ B b% l8 Q, |, a+ t# c
to setup-patches% d% B$ U6 c) {. k
;; initialize the patch-owned variables and color the patches to a base-color9 o' K/ s3 e' u7 I- U3 t( p# j; O
ask patches5 S! j1 L/ S9 B9 v
[
, {! R, m* e- M set intersection? false
; s) B0 Q$ n0 T+ u# B& d set auto? false
7 a0 R1 U! t, Q set green-light-up? true' }2 g+ K! h6 c/ W& H. B( }
set my-row -1$ t- f5 h9 d5 b. }3 T% ? t. i
set my-column -13 E4 U$ U+ Q1 R
set my-phase -17 R% V# m; a5 n
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets! c C* E* g* w7 D3 U* d- Q; L
set roads patches with
/ G3 b* E( z( `% f6 j [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
( s! K! T$ A6 h8 @; P2 k" t7 k (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
) c Q& u/ z: F: i* l' \; k$ d set intersections roads with
7 H$ v1 A8 a* X [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and9 {( W6 S0 g* e( T, ]
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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* y, I% h3 z7 k. C ask roads [ set pcolor white ]
( K l/ S- h2 p( _. ]7 Z setup-intersections
5 G P# K) b' Lend
0 x3 x' z3 p2 J3 b/ T其中定义道路的句子,如下所示,是什么意思啊?
% G* H; Q7 ^9 w% K, B" R1 y4 X: z set roads patches with
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(floor((pycor + max-pycor) mod grid-y-inc) = 0)]2 o( o, l$ D7 K s/ P* R7 b' T
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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