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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 q" f. I4 z ]5 R2 pnetlogo自带的social science--traffic grid这一例子当中,
- `/ C& c. W5 k6 B: G; k* G2 Uglobals5 O5 G6 @" D7 e0 c( ?
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. n h' l2 K. k7 [# M grid-x-inc ;; the amount of patches in between two roads in the x direction
( m; s5 s) t- Q1 o e% k9 ] grid-y-inc ;; the amount of patches in between two roads in the y direction
9 q- R! U A) Z1 @, T% m0 x acceleration ;; the constant that controls how much a car speeds up or slows down by if4 C1 x: f5 M8 C, U' v
;; it is to accelerate or decelerate
; m7 C5 ^; T1 `+ B: P& z/ |4 _ phase ;; keeps track of the phase
5 ^ U" \0 }" c/ @3 e- E% B) W num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure( H1 g0 p6 M8 T# @ e+ J D
current-light ;; the currently selected light
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; J) I* [# B5 Z, I5 V' d ;; patch agentsets0 y9 h/ r0 h* ~8 F% h
intersections ;; agentset containing the patches that are intersections
: l. a0 ^1 R" p; ^9 g5 Y& V* C roads ;; agentset containing the patches that are roads
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turtles-own" k* W5 T5 P' I% Z% ?) y) G" h$ n$ W
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speed ;; the speed of the turtle
0 K) g1 k: h" P6 i up-car? ;; true if the turtle moves downwards and false if it moves to the right2 [* n$ J3 F L* T* y4 m" X
wait-time ;; the amount of time since the last time a turtle has moved- R5 s. O% g4 c, U2 ^: _
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patches-own
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. D2 V' ~/ W# J4 D intersection? ;; true if the patch is at the intersection of two roads& d6 W7 j0 p7 M2 r6 V
green-light-up? ;; true if the green light is above the intersection. otherwise, false.5 {% j* X$ ]; @# n: C
;; false for a non-intersection patches.; O. |* C) P4 L% _3 T
my-row ;; the row of the intersection counting from the upper left corner of the" h. ^! }" J* D V3 ?1 R& P
;; world. -1 for non-intersection patches.
/ w2 o+ w7 a3 V" g5 h! l, b! Q my-column ;; the column of the intersection counting from the upper left corner of the+ D, Z. s% w# {% |: i# X! }
;; world. -1 for non-intersection patches.
2 S/ e5 P! i8 _2 d- b9 q' F; {* y my-phase ;; the phase for the intersection. -1 for non-intersection patches.2 F) Z3 W8 z$ b! x: L
auto? ;; whether or not this intersection will switch automatically.
3 e# i( D# |$ V2 E: ?* L; A! I* L ;; false for non-intersection patches.
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" W. R+ s; C* v) l+ \;;;;;;;;;;;;;;;;;;;;;;
: d; ^; q* z _# L7 o5 H" O# J3 F;; Setup Procedures ;;, v$ T' J) P" t; \$ w
;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.
5 x0 a( t, \* Z+ x a;; Create num-cars of turtles if there are enough road patches for one turtle to- P- O. `) ~: i# _+ ~
;; be created per road patch. Set up the plots.2 c( z% Q1 `0 [ j: x* e6 b
to setup5 _3 b4 F* N# M! U" p
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setup-globals" t4 v0 T2 i, ^9 @
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;; First we ask the patches to draw themselves and set up a few variables
0 W f+ E" C: N; K, G/ B setup-patches
( Y; e/ J5 m' Q3 \3 R: [ make-current one-of intersections6 X2 T/ e- a3 E% h
label-current, k( j7 q, z, w7 ?4 a
8 L" @/ }) O9 @6 C( g0 H* v set-default-shape turtles "car"8 S( z- |( i2 I& D4 P) o
# f# I4 ]9 V& ] if (num-cars > count roads)' n% ? n/ C9 M% ^) x
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0 S/ F( H" q' i& N V: ] user-message (word "There are too many cars for the amount of ") S% w' U4 D9 V Z
"road. Either increase the amount of roads "
! e- @+ A5 h D' F' ^ "by increasing the GRID-SIZE-X or "
& l% J; J2 p1 u9 l% J+ c "GRID-SIZE-Y sliders, or decrease the "
. m6 ]7 P; X4 w V8 i( H D9 C "number of cars by lowering the NUMBER slider.\n"
; M4 x4 V& ^& n6 R' Z2 S "The setup has stopped.")
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color+ S, W2 d/ r+ o% o6 L5 u# b
crt num-cars) B# _5 t+ U8 X/ H7 y1 z0 h
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setup-cars: G4 X* y4 I0 k. K @ N# H0 W
set-car-color8 t# R- y# c5 l1 E/ ~% ?# Z& I: W9 x
record-data
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;; give the turtles an initial speed5 ^, w- v* K2 i# ^7 q. ~6 C& J
ask turtles [ set-car-speed ]
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reset-ticks( m8 f4 p9 V2 t" b, i& t
end
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- A/ t* m$ h+ @ x, O( B9 H;; Initialize the global variables to appropriate values# h) y! {: g5 s2 V
to setup-globals/ z: z) m( V0 U+ ]+ W5 Q$ a
set current-light nobody ;; just for now, since there are no lights yet
3 `: @- S! ?/ ]9 D set phase 0/ U" R5 D( Z# m' j; x5 \
set num-cars-stopped 0
+ ~! o, Y$ j; j: l. n7 C set grid-x-inc world-width / grid-size-x) r0 T" c2 k8 D
set grid-y-inc world-height / grid-size-y$ b ]. ?5 \. u" X; l
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary$ v/ K; Y' O# v& d1 K* L7 c( _5 r( _
set acceleration 0.099
( `7 q0 A& X2 w. C% \" h! _end
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" L8 z. `$ U) ?$ Q/ x: n;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
. ~' O' K' g1 A6 B' z0 P- y& D;; and initialize the traffic lights to one setting
% V$ `7 Z! m( _7 p' k! Oto setup-patches, k: H8 Y! B. m/ M& X5 z
;; initialize the patch-owned variables and color the patches to a base-color
% ~4 S% B8 n2 j# Z7 Y1 ? ask patches
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8 o, T- G h2 U, U$ Z2 R# h set intersection? false; ^, y* N' O5 {2 U
set auto? false
) V1 ]: x7 S" i- f* i8 A4 }4 c set green-light-up? true
6 F4 b5 Y, U* t3 _, V$ n set my-row -1$ j6 K, r4 g$ \+ p' l7 }+ q
set my-column -12 M( w/ x% r; Y3 s& k- O# u: E
set my-phase -1
* Y0 t5 H! n; j3 n q9 C H _ set pcolor brown + 3) N5 t4 i8 P! Y: p, L
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;; initialize the global variables that hold patch agentsets1 S1 X$ n4 Q/ R1 A! q$ U$ }- y
set roads patches with
4 T2 y5 h: r/ N [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or$ o6 w5 b( B9 K' u# q
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]( \( \0 w. Y+ v# W6 o7 {+ z/ m- x% ]
set intersections roads with
& Y5 x) d- ]5 A$ n; i" Q; l9 z- Q [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
. g. Z: @1 f$ J2 Q% z, e* w7 s! B (floor((pycor + max-pycor) mod grid-y-inc) = 0)]" ?5 [. X5 S' }' @4 n0 B& _
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ask roads [ set pcolor white ]7 d0 \' U: f3 o6 B4 ]1 N
setup-intersections
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r! E. A* U8 O, T4 H8 c其中定义道路的句子,如下所示,是什么意思啊?
' E( v" ~" ^7 H& r# ~! s7 Q. Z set roads patches with. N7 s) D* A0 Z8 b+ y
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
+ b& o1 o! M; n' k8 @% f8 k (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
; l5 o. U1 L _) L: w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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