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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。
* T J. I% C) @! J/ L* ?/ u9 ?netlogo自带的social science--traffic grid这一例子当中,
% h/ T; N) r L6 r, s; V! Xglobals$ i) J: h4 J. v
[
) w9 g; E- R3 p* x+ v8 F1 p3 d P grid-x-inc ;; the amount of patches in between two roads in the x direction
8 k( e0 e" q: s/ L% j grid-y-inc ;; the amount of patches in between two roads in the y direction7 v" }' H+ @2 A; |( ]+ }
acceleration ;; the constant that controls how much a car speeds up or slows down by if
$ @7 W' ^+ c0 J2 P+ [' T3 \3 w ;; it is to accelerate or decelerate
3 f/ H" i8 i2 z1 _5 e& U$ H phase ;; keeps track of the phase
! n/ p# w2 r: R" b }5 P num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure- J/ r6 m2 I7 t& X! {
current-light ;; the currently selected light
& X" @+ s) ]9 c! H( p4 t( K# f, n0 Z S
;; patch agentsets
! V V" f! {1 T& Q4 S( B intersections ;; agentset containing the patches that are intersections
% z; g5 n+ K3 U roads ;; agentset containing the patches that are roads: g1 u7 ~7 V* s% e& i6 I
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) X9 l8 b F& P3 G( f8 H. }turtles-own
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# }3 }8 _+ {' D4 d speed ;; the speed of the turtle
8 w' m2 e) F; Q0 h up-car? ;; true if the turtle moves downwards and false if it moves to the right
1 v' \: S1 I5 }7 J; ^. |) g9 O wait-time ;; the amount of time since the last time a turtle has moved7 u1 u: {! c7 z7 N
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patches-own
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& ~7 `6 |+ {( R8 k( `/ U intersection? ;; true if the patch is at the intersection of two roads; V4 ]5 M: [7 v* g
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
' ]0 I J+ D1 X( v$ \ ;; false for a non-intersection patches.
. x, B4 p8 s0 \ my-row ;; the row of the intersection counting from the upper left corner of the
$ R: T+ a- R- M }9 Y ;; world. -1 for non-intersection patches.
5 W: M7 U2 `: E) U+ E my-column ;; the column of the intersection counting from the upper left corner of the6 x5 _0 o0 g' a1 o+ f
;; world. -1 for non-intersection patches.( H1 H0 \# T/ U6 S5 @2 z1 w
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
' M8 t3 g# G* e* b auto? ;; whether or not this intersection will switch automatically.3 y9 W0 e; o- w
;; false for non-intersection patches./ c+ J: u+ O% V" }+ f
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5 ~+ ]+ o, W# r- d! j. |1 e
1 e- n( x. {( q$ j. @# `;;;;;;;;;;;;;;;;;;;;;;0 l8 q( X- O) K7 Y% K" ^. i
;; Setup Procedures ;;& M5 G1 ~3 R7 h8 w6 c
;;;;;;;;;;;;;;;;;;;;;;3 ]& H2 @" C! z. F7 `$ v; u" p+ b
2 D& q: \' m2 ?0 Z4 f* q: E* F
;; Initialize the display by giving the global and patch variables initial values.( @- @: G9 U* y% S) |# L2 L
;; Create num-cars of turtles if there are enough road patches for one turtle to* V, ?6 R& k7 w% ^$ y. Q1 C
;; be created per road patch. Set up the plots., v% N0 x- `2 e; {& m6 l( W
to setup
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setup-globals
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6 ~1 n; ^& Z+ {: p+ M1 V+ o# Z ;; First we ask the patches to draw themselves and set up a few variables
: p( X' e t! F2 b5 ?: I+ M setup-patches. \$ r! o, q8 q5 z3 b) k' {
make-current one-of intersections8 {! F& q1 q0 S3 M. }2 w+ ]
label-current6 @ Q F& C# Q" E
# ~; |: L+ L' |8 O5 k: ~- [# V set-default-shape turtles "car"
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: Y0 ^ h1 M0 z7 _ if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
0 B8 j/ f# p a) ~+ } ` "road. Either increase the amount of roads "
+ G+ x! @2 N4 A0 ~5 Q: ~. ~ "by increasing the GRID-SIZE-X or ": T- ^3 D* `! v# ]/ h; V% F, `5 L
"GRID-SIZE-Y sliders, or decrease the "
' ~. U V" T9 {2 I2 o "number of cars by lowering the NUMBER slider.\n". T1 o* J$ ?+ i# z8 G
"The setup has stopped.")
/ W9 }7 a. m" Q& h! F stop
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7 ^4 E! S' l& B- p i ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
+ A- [# k( v% B6 |) k crt num-cars
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J& [ L, M2 u/ k7 {3 Z setup-cars
: d! c/ y- Q; n) Y% ?2 m8 Z. }7 E set-car-color
! h5 u$ M5 }$ @/ P7 k0 X record-data4 @9 X: q/ J5 w
]
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1 C3 J' q* @7 f0 V- l ;; give the turtles an initial speed. s4 o7 k f7 U/ F- H, a
ask turtles [ set-car-speed ]
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reset-ticks
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- n$ x9 a) `, R! m4 M;; Initialize the global variables to appropriate values- F2 l; u0 n" \/ e
to setup-globals
. R/ B" ]+ }# q' C set current-light nobody ;; just for now, since there are no lights yet
0 a! q/ [7 m& V+ C set phase 0) o# m4 |5 T& v5 ?
set num-cars-stopped 0
2 F* j2 {' V0 s3 s& j; Y set grid-x-inc world-width / grid-size-x# W1 u. r) N6 K. [4 | m' b1 q" {1 J
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% i& m: ?! `4 O( C" z8 A2 `
set acceleration 0.099. {) B( G1 n* r1 a
end6 J* `* G# ~- \9 g/ O
4 L1 x7 ~8 ]' O+ {9 ~$ s, n, Y# f( x;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
) v5 O, @- B- I7 W3 k) U;; and initialize the traffic lights to one setting' K5 ^% f( ]- m* v1 l {
to setup-patches
3 T; e8 e0 u2 \6 _! o" X ;; initialize the patch-owned variables and color the patches to a base-color
0 r2 U+ l* j' {6 J c ask patches& y1 C% [6 ], T
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1 H5 K+ |3 M2 Y$ \" h- x& Y set intersection? false
; u' Y4 h/ f: M$ t set auto? false; X5 b7 g; a" D/ g L
set green-light-up? true( }$ y+ w4 S. R5 V
set my-row -1
, _+ C$ q* |3 n; v set my-column -14 |* e" O$ A' `1 u8 Z7 G" b, l
set my-phase -1
9 q1 M# `! e& R. q$ Y' K: U; O( }& O set pcolor brown + 3
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: U: O) O6 Q' m0 n ;; initialize the global variables that hold patch agentsets0 E# T% F7 R& |
set roads patches with
' A, s8 P; \' g$ i+ V3 z& q [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
7 \0 `' S! d. G2 m. b (floor((pycor + max-pycor) mod grid-y-inc) = 0)]6 M" z$ |' U2 _) A
set intersections roads with" U4 h* g5 d/ f" {5 D
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and% r* _7 g7 J; Y! `
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]1 N% O' a8 s7 }5 a
* v$ y; j, ^- m/ }- u0 i( w. O7 v ask roads [ set pcolor white ]
2 F# c- P- `4 p r setup-intersections% o9 A4 M- d4 ?7 |, b" ]
end
% ?" W( s5 z0 D" d" Q! Q8 c7 u+ k其中定义道路的句子,如下所示,是什么意思啊?
; F$ }+ S4 e6 j set roads patches with
% w, Q7 C5 c: | [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or* D# e2 J, [* f& T3 O% B. [3 ~$ T. M
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
/ K) |2 Z% ^( 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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