|
|
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 n, j7 Z8 N( o5 q# r _% x
netlogo自带的social science--traffic grid这一例子当中,
( ~( A, _. `# \) s* lglobals) G4 m+ I+ |1 Q5 ], o I- x
[
" H' {- A) z0 O" P, v q+ \; F* g grid-x-inc ;; the amount of patches in between two roads in the x direction
3 p( L3 m, I9 Q9 O" K( c' e grid-y-inc ;; the amount of patches in between two roads in the y direction6 p" y+ O9 l) z4 j5 x; g+ B
acceleration ;; the constant that controls how much a car speeds up or slows down by if8 G! v* b& }3 W0 U% s) W3 b, J
;; it is to accelerate or decelerate
9 |0 ]4 m ^# J$ W$ ~ { phase ;; keeps track of the phase
- X, e1 r0 G1 t. g! m$ u num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
2 f5 ^: \3 u' A! R current-light ;; the currently selected light( v7 q+ |$ D" S: A0 b
$ P/ u, O# {- y) y. z+ |
;; patch agentsets
. m& A+ h7 d' E8 W8 \1 a intersections ;; agentset containing the patches that are intersections
# k; T8 f5 _; s$ |0 X/ v roads ;; agentset containing the patches that are roads- V3 [8 f( Y( ]: M" N$ w
]& E9 Y: [9 [, z7 q$ B9 Q# e8 _
4 `; h4 l2 a: s& Y
turtles-own
~6 n8 b& h a[
2 i$ T. ~% m6 z& `0 G g: ?) w7 x! ` speed ;; the speed of the turtle
+ a3 m: ?9 E j% Y6 G6 y up-car? ;; true if the turtle moves downwards and false if it moves to the right- k3 E9 W$ Z5 J/ e3 z, I7 i
wait-time ;; the amount of time since the last time a turtle has moved( p6 i! l. L8 Q4 g. M$ H: Y/ y6 T5 ^
]
' u+ J9 C5 `$ L" [
) F- X: a0 D$ _) X. [ L3 O% i3 ?patches-own
5 l! e, o% Y6 Z8 A5 F% E[
; Y. Z* ?" N/ k9 _6 r intersection? ;; true if the patch is at the intersection of two roads
, @3 b* p i0 [* o6 q+ I7 Q% Q green-light-up? ;; true if the green light is above the intersection. otherwise, false.
0 P H2 _7 N4 B0 w; e+ @+ f T* T S ;; false for a non-intersection patches.
: D _$ v$ o* a2 {% k my-row ;; the row of the intersection counting from the upper left corner of the
; J% O5 P$ l0 y3 {4 T+ O; B ;; world. -1 for non-intersection patches.
" }# U |3 f# M7 B) g my-column ;; the column of the intersection counting from the upper left corner of the
, h" A' [" {, G" l8 I3 k- p' k9 v9 R ;; world. -1 for non-intersection patches.
+ y5 a0 ~* A m6 e) B. ^6 D) U# b my-phase ;; the phase for the intersection. -1 for non-intersection patches.
2 p* e' V e0 \) J7 k auto? ;; whether or not this intersection will switch automatically.
' b; `2 @: }+ [: t ;; false for non-intersection patches.. ?8 F* t$ |1 j, |
]* C! P$ n' R1 ]$ ^3 d8 R0 D1 I5 O. r
& R) m0 I' e/ K/ i/ {
3 k/ m' ~+ _4 t) b: f
;;;;;;;;;;;;;;;;;;;;;;
# {( O! r1 }. W6 a;; Setup Procedures ;;
) _+ B; {5 f' b& q;;;;;;;;;;;;;;;;;;;;;;0 N" s5 I* ? D E" n
, I; D; I2 k2 V( k- o9 o! F;; Initialize the display by giving the global and patch variables initial values.. a" }- T8 S$ E- E! D- [# e0 t
;; Create num-cars of turtles if there are enough road patches for one turtle to' p) U: N- q' n1 h+ @: B
;; be created per road patch. Set up the plots.8 @2 e3 w3 ]& W
to setup# X6 x& q E( c2 C( a: o9 r/ P
ca* y2 O/ Y4 n: Q. O% s
setup-globals
! p- ~& }' ^4 g% P
# p4 M- _: g1 I1 Z2 V ;; First we ask the patches to draw themselves and set up a few variables6 O h3 @+ s l- m
setup-patches/ B- H2 y: o' G. H
make-current one-of intersections# i2 ]! y6 H1 |2 K$ h% ~
label-current6 i; ~; e$ y: N9 y
& \) [' V! ]: q
set-default-shape turtles "car"
! ~# W, g- ^5 k0 y! ?1 @" R1 Q' e, Q
if (num-cars > count roads)
' D) n* e# i# W% V3 E [7 X" _1 F1 G: Z: Y
user-message (word "There are too many cars for the amount of "" _8 K+ ]' [4 U. H* o
"road. Either increase the amount of roads "
4 X9 H. w/ x8 ~, Y, E "by increasing the GRID-SIZE-X or "2 k0 M% N6 O" [
"GRID-SIZE-Y sliders, or decrease the "
! d0 _3 N. m0 e7 j+ C6 i. e( ?. ?) A "number of cars by lowering the NUMBER slider.\n"
0 |* M+ c# g/ E "The setup has stopped.")
! r$ {$ d( J% I1 ]$ h1 p stop
9 R; D2 m$ }" E, D ]' j& q, K. d$ k3 f# u# P& f: U, X3 ~$ p
1 d. _/ \- \* @$ M' ^ ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color/ ~" v5 v- ?- d1 Y* j
crt num-cars
$ n) I; u8 W* F% H. V7 b% j" w [2 R" L8 u( j( ~1 b7 h
setup-cars
- S- A+ s# m( N, u) B3 l. n set-car-color
& b8 o! R3 b1 U* \ record-data
; B* b# m& J" [2 t ]
7 J; Y0 S+ c" @7 X. x' D/ p3 c
! v; W' F$ Y1 T6 \. }; u9 x ;; give the turtles an initial speed
: `& `8 G" p4 B1 X ask turtles [ set-car-speed ]
" D. w; F% p8 }$ a/ A- H. f0 k- N2 B. e+ J
reset-ticks
) Z2 P) I6 ^0 tend
; R3 x) p! f9 u2 y. e% E
* G( C) n) _% p/ J;; Initialize the global variables to appropriate values
1 G7 `/ B- C% N0 ^6 A6 K! V0 Tto setup-globals
# ~; f! b$ r5 `7 F( ~9 s' o set current-light nobody ;; just for now, since there are no lights yet
' {/ s+ Q3 D" r2 F- s set phase 0
0 N" R: ^# }* R: O6 O( h set num-cars-stopped 0
- M! x6 f# I/ Z2 P6 p set grid-x-inc world-width / grid-size-x
3 w0 A' n- ]8 e$ U3 b set grid-y-inc world-height / grid-size-y% g- t$ _5 c& ~3 n
& P$ U( O- i5 {% _' X; U6 [ ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary8 L- J6 {* J, {. i [" z
set acceleration 0.099
. X0 X/ x; z9 vend
: _( |$ D0 s; j0 r/ C+ O: y4 X( w4 B0 C j+ Q/ T' a+ I3 H8 x
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,# c/ ?4 L# ? i/ l( i3 D5 j* I2 E3 B
;; and initialize the traffic lights to one setting
7 @1 k) M# m: N% M: oto setup-patches' ^' ~# A" ?6 J: U/ l7 D6 Q
;; initialize the patch-owned variables and color the patches to a base-color
3 M/ S, F3 \6 H, r3 U( M+ ] ask patches
$ l) c L, G M2 y [9 F! y# v' i8 P! v$ i
set intersection? false* U' O& G# n! ^9 l
set auto? false
, {( z5 y# z+ ]' G set green-light-up? true# z! G) R! L5 H
set my-row -1
) t/ F: M, b( U8 }( j/ @& l set my-column -1
. D5 c( ~" j+ {. X set my-phase -1
( u: Z* g* \ S) j set pcolor brown + 3
1 E9 L) H! @$ a* H H ]' |" W0 i/ o! k* {5 d
8 w0 u& H' r9 r+ q# d. I7 m ;; initialize the global variables that hold patch agentsets
' V4 g- }* o: Z4 P% J& L set roads patches with1 K0 h: x5 V; f$ Z% Y4 M2 w9 b
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
* V* D8 G6 J; h" z) I3 C1 S (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
! _' ]4 E3 z; L) R$ I2 F7 N8 }8 X set intersections roads with/ ?& }6 Z$ n7 j* [1 z" @; j) a0 p
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
* W0 m9 P( S" ^ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
5 P, A }- }* }
: u8 e! R/ F+ h/ {" \ ask roads [ set pcolor white ]0 V5 p) O' ~+ M* P
setup-intersections
e) z' K' H+ ^( jend
: r; e: }# j: a1 D其中定义道路的句子,如下所示,是什么意思啊?
! u( b- E: r5 H/ p( Y+ Q set roads patches with; H! o( D. }% ]
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
6 X. t6 H; f* {% g0 Q4 }" d (floor((pycor + max-pycor) mod grid-y-inc) = 0)]5 Z2 [3 H' l: Q$ p9 s
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? |
|