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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。: W. k# B6 D) q, D* n) L
netlogo自带的social science--traffic grid这一例子当中," L! t: H e* V
globals
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; R9 y' v; G1 X. G, H% [ grid-x-inc ;; the amount of patches in between two roads in the x direction
! V. g8 ~! {9 M: w; `$ {8 U: @* | grid-y-inc ;; the amount of patches in between two roads in the y direction
. V% y# B1 K( Q( A+ E acceleration ;; the constant that controls how much a car speeds up or slows down by if" T$ M6 N. M# V# O% d4 }, Q& a
;; it is to accelerate or decelerate
* V- L# ^7 C0 H: U. O% ~: D phase ;; keeps track of the phase7 x. W$ W3 P3 a8 U/ ^( y+ u" r: V
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure- D, N1 [3 t3 h" i
current-light ;; the currently selected light4 k! A8 A( I3 W( `6 W
( ?1 v0 Q$ q$ b# T v$ n7 H ;; patch agentsets
" P. z( N% D' z5 u% w1 ~ \ intersections ;; agentset containing the patches that are intersections. {& X. |, o$ J* o: X' V
roads ;; agentset containing the patches that are roads
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) ~5 W; c- o. x7 t/ Z6 pturtles-own
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speed ;; the speed of the turtle
1 H& t: s% o5 M up-car? ;; true if the turtle moves downwards and false if it moves to the right
0 ~3 T+ N9 S, H& X: u; Y+ s) A wait-time ;; the amount of time since the last time a turtle has moved
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patches-own1 V! O4 m8 X! D
[
- h% S4 @7 m- p+ O2 L, } intersection? ;; true if the patch is at the intersection of two roads
! _' k6 s# t6 _0 P. Q1 V green-light-up? ;; true if the green light is above the intersection. otherwise, false.+ ] i- v$ I- _8 u7 o
;; false for a non-intersection patches.* x( L3 @$ y6 R/ A$ F( H; o
my-row ;; the row of the intersection counting from the upper left corner of the5 K' o$ J4 H2 Q7 u' J
;; world. -1 for non-intersection patches.$ Z5 w8 G! ~' G" R8 t1 s
my-column ;; the column of the intersection counting from the upper left corner of the
& p" N% T4 q7 m3 a) P ;; world. -1 for non-intersection patches.2 {! Y9 Q) P( i/ C0 s: t @# [4 r" O
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
7 i9 @$ e1 T- k% P auto? ;; whether or not this intersection will switch automatically.* m' X1 ^; p5 F9 w }* X8 v( s3 E
;; false for non-intersection patches.. ~; F$ @9 U/ s: n! K- n
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4 s3 D7 d% Z9 l! N* T;;;;;;;;;;;;;;;;;;;;;;
, O& X0 {8 J- r! N! ]0 _;; Setup Procedures ;;, v- K1 r) }; p; g! v- N) K
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;; Initialize the display by giving the global and patch variables initial values.& f( F" _- Q2 {
;; Create num-cars of turtles if there are enough road patches for one turtle to
2 E# U0 K% u8 S;; be created per road patch. Set up the plots.
9 P# y3 z1 [5 @# t" Eto setup
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setup-globals8 }1 ?1 I+ [, q+ h! d6 y* P0 h
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;; First we ask the patches to draw themselves and set up a few variables9 F# }. q( a" x3 q% G
setup-patches9 \ j) ~% @2 ], O2 V3 W
make-current one-of intersections. h, q& K& @" N7 x# ^* C
label-current
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set-default-shape turtles "car", o2 [* U4 @& A! i* W0 E$ D4 y- c
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if (num-cars > count roads)8 M" H9 J. F5 V
[
6 J; s* }& i O, h s( B9 V% N3 Z$ d user-message (word "There are too many cars for the amount of "
. m5 E8 y6 L) N m5 B2 L, T "road. Either increase the amount of roads " N+ ?5 [ R% V0 B( U
"by increasing the GRID-SIZE-X or "$ [" M$ T( d0 M1 A
"GRID-SIZE-Y sliders, or decrease the "
i8 a# `3 x$ O' V' V2 B "number of cars by lowering the NUMBER slider.\n"
3 E, n+ }1 ^& H4 b. R- e "The setup has stopped.")
9 C8 o# x; u1 v4 ?, p6 h0 e stop. M7 k. a7 I# |5 W
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
" ~6 v- q! m: X' c crt num-cars# w4 I1 l+ P/ S7 A1 I6 x
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' _* h: P, @ r# N8 {7 z setup-cars
% A- R9 ^! m" J6 @; S; [ set-car-color$ b* @( y/ J* |% |$ u6 T! D
record-data! E8 \" G1 K2 N g4 @% L1 N
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! s$ m6 k$ s# h- [" V) W7 T; l ;; give the turtles an initial speed
' j' I0 h4 q4 N5 q ask turtles [ set-car-speed ]
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9 R9 @3 n& c" X5 P; s, J# j reset-ticks
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' k0 D8 z( ]. ]# o2 R, N2 O;; Initialize the global variables to appropriate values4 @% z; Q8 G- L: ~! `, m
to setup-globals
" H6 i+ O6 J; n/ M6 J/ i/ I8 e, N( z set current-light nobody ;; just for now, since there are no lights yet
2 y( N. H7 G# H4 P: p set phase 0) O, x9 t* t0 B7 y7 s5 A( x" a! G. i
set num-cars-stopped 0$ Z4 H, |. n \7 e/ J) j, [6 I
set grid-x-inc world-width / grid-size-x: H6 u4 ~, i: \$ Y
set grid-y-inc world-height / grid-size-y2 I) m, c4 {9 h/ o7 I. m, e% Q
: @" q8 B% R- _1 R3 Q. t4 \ ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
6 b2 ~; [% w) w$ S8 t" I1 N set acceleration 0.099
. x' o+ M: A4 e) X+ t% g" @end
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, X% _; J3 K* ~: C( n( {1 A;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
! p3 J$ k3 U5 P% V;; and initialize the traffic lights to one setting. e! T8 t0 q9 T8 ?$ \7 v! w
to setup-patches
- Z, r: D( _' [) p( J ;; initialize the patch-owned variables and color the patches to a base-color2 i' \9 P) N# ?6 ~8 `- d
ask patches$ M- b* v" q8 Z( U' A) y) U3 V
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set intersection? false
2 ?& _: ^1 P- [: {' A9 ] set auto? false
( U5 v( w. z. s5 _ set green-light-up? true
' ]6 ], ^5 T C# z set my-row -1% ]* ?& ~8 }' b1 q' Q/ O3 A
set my-column -1
" R' a1 p" v1 z' b5 e K set my-phase -1
( z4 |) B# w0 H* R/ Q9 p$ r set pcolor brown + 3
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8 }& V5 Q. u8 T2 s8 f/ ~* j" E, m6 n) i ;; initialize the global variables that hold patch agentsets
! j. G- \3 I) X( b' F set roads patches with
1 q% [) W4 V4 A# l [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or* v4 y6 u8 F i& g/ h" J2 E7 d
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]+ w" I+ |- y6 E. F2 L
set intersections roads with+ A; V6 E) m. o6 c( N1 \
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
+ n8 h( K! h; T (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ] c7 K5 p: G' E+ U' P }
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?8 y* P: i j/ U: V& \
set roads patches with
" ~+ I! W! F- |* U; j; m [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or6 ~3 W) k% B) y
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
' o0 Y" ~6 G1 Q$ u f* H0 r$ 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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