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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。
& L* t+ G6 R& F9 S0 J! ^$ anetlogo自带的social science--traffic grid这一例子当中,* Y! X% U7 q; ^/ A4 y) x
globals! C6 V5 k$ z2 a7 M5 i8 V
[
% G. d1 C' n/ k# B3 |: ` grid-x-inc ;; the amount of patches in between two roads in the x direction( z: }' r' P' r. X. ]/ k% {
grid-y-inc ;; the amount of patches in between two roads in the y direction
) C! N4 I! }7 C( C7 W8 y1 D* r; p) b9 R acceleration ;; the constant that controls how much a car speeds up or slows down by if2 T( ?4 v" O' G- y9 T+ J
;; it is to accelerate or decelerate
; X5 l- p* z/ P phase ;; keeps track of the phase
; c: N1 }. h: |4 Z t" `( e num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
* {. S( z; w4 p$ N current-light ;; the currently selected light. V) Z+ m% q) s2 D( t O
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;; patch agentsets+ t- i# V5 A* ~' Z9 A) j& w) d
intersections ;; agentset containing the patches that are intersections
1 I$ @/ _/ o9 J- K% r q, h; n roads ;; agentset containing the patches that are roads
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o: ]! {, u/ K0 `! ?2 zturtles-own
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speed ;; the speed of the turtle
* I0 K: f1 c `, u+ u9 ?2 u up-car? ;; true if the turtle moves downwards and false if it moves to the right* y: ]/ R& a& x, S
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own/ B9 I" q, g* g! i* r; K
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intersection? ;; true if the patch is at the intersection of two roads
* r8 Y& S1 C1 M+ V- X' n6 Q. a green-light-up? ;; true if the green light is above the intersection. otherwise, false.8 j( A5 A; t7 l* D, B; G. B
;; false for a non-intersection patches./ B& t3 w0 Y* |8 I9 a0 H! M& \
my-row ;; the row of the intersection counting from the upper left corner of the/ W# v- x; M! O5 j5 w6 B2 E. a
;; world. -1 for non-intersection patches.
- b: @( H+ f+ s1 X! l+ F+ W! P2 V my-column ;; the column of the intersection counting from the upper left corner of the: k* h1 h0 z* c- O( ]
;; world. -1 for non-intersection patches.
4 s7 j8 |, {% }, U, W# d my-phase ;; the phase for the intersection. -1 for non-intersection patches.1 S% i1 q1 S1 H1 j
auto? ;; whether or not this intersection will switch automatically.
) x! [# v, Q o% U ;; false for non-intersection patches./ u9 J6 G. u' E( J1 q$ N- U
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p/ u+ l. e: b3 o$ S2 ^3 f! E/ D) N/ y+ \ H4 b
;;;;;;;;;;;;;;;;;;;;;;2 E) n7 y: }, ?& G, O. x! V, I
;; Setup Procedures ;;
1 H$ ^' G# ^0 g/ z;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.
- s2 O: p! V: W+ S: f7 n& B;; Create num-cars of turtles if there are enough road patches for one turtle to q; M9 n$ T6 ^; b
;; be created per road patch. Set up the plots.
+ z. }" N6 Q" C7 S! |! K, jto setup
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setup-globals, N, ~* X( p, R0 `9 X1 r6 p
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;; First we ask the patches to draw themselves and set up a few variables
. a' ~% }- D4 n! n setup-patches
7 S# U, u: q' T# Z0 F$ z make-current one-of intersections
- G7 {5 m. ?1 I; V: \ label-current) w9 y) l' S: W9 H" J. W f4 `
# R0 H) n9 z7 S 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 "
( h* j: ?. V+ {; g; t+ z9 Z "road. Either increase the amount of roads "
. J: ]+ x5 H$ ^- I7 [2 x "by increasing the GRID-SIZE-X or "! ` O$ K- k" D/ j
"GRID-SIZE-Y sliders, or decrease the "9 P/ M z/ e3 Z) Z, Z
"number of cars by lowering the NUMBER slider.\n"- p: x# A$ C$ q# O
"The setup has stopped.")- O( y5 o" w0 ?; R/ E" r
stop' `: @" S5 ?( d6 U' t3 K0 t! G
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$ n) a2 P8 S4 i* M* P% S: e' n ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color8 w2 p9 L0 U/ X. n8 @
crt num-cars9 d# [3 P. l ]- H5 y
[
! P/ D' h* D" c2 I setup-cars
" Y9 d5 F+ T# o+ \7 Y; k set-car-color
: L3 j" I1 w0 @% _6 m record-data
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;; give the turtles an initial speed
4 d( m' x9 f* Q% H ask turtles [ set-car-speed ]5 y, s# l: S: j* e4 E& T
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reset-ticks
+ \. P2 d( R9 |0 iend
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, x7 g% i2 C p& C# l! d;; Initialize the global variables to appropriate values
! S8 X% _; Y: z; yto setup-globals) W+ [/ a& k) O! h, Z
set current-light nobody ;; just for now, since there are no lights yet1 w0 X7 i3 E# P& S3 U
set phase 0
: |( { f3 A' w' J6 Q- y set num-cars-stopped 0/ ]$ \9 |) _. ^( Q" |* j0 [
set grid-x-inc world-width / grid-size-x
+ V7 @& L, L, n" V2 z4 W 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
2 S l. X! o8 G8 [0 Y1 e& Q set acceleration 0.099& U T. G1 D# {; @6 a* b* [; L
end% j+ ] L$ Y/ n0 Y( Z4 d" p0 P
; `- [: O- h: t; k4 ]% n, E& Q7 D
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
: |7 n v3 r& k% g4 A+ P;; and initialize the traffic lights to one setting7 }1 V8 I* \8 M5 s# M9 i6 B w
to setup-patches
) q$ D' h0 j5 g* A' z* G! L ;; initialize the patch-owned variables and color the patches to a base-color
. [! {, N, K& T ask patches' Y) J& V9 O/ }+ l
[
0 @4 U2 u9 W5 T) M/ ~5 ~* j set intersection? false |' d5 r9 [+ P b: X* S* P
set auto? false
8 [- k1 N; c @+ J8 e+ z set green-light-up? true2 r5 P; K8 s) T: Q. A: Y W
set my-row -1
# Q; c' F% K. K- L/ r: ?: ?' u set my-column -1! U Q1 X/ y/ K, v! u& k, g' F
set my-phase -1' b! Q8 g/ \6 R5 e8 C
set pcolor brown + 35 H! Z1 } y2 m1 E3 e. w7 _. s* y
]
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* C' `, ~, S+ ?" F ?/ [ ;; initialize the global variables that hold patch agentsets
8 \+ }* e2 J8 {& Z$ W set roads patches with; k0 m( D* Q# P. G
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or3 p n/ I) {' D! E. s3 q
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
" j" C; J9 R x8 R2 i6 S3 z set intersections roads with
( E- R8 V/ P; F( G# M [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and/ _7 q# z: N3 U/ k0 n0 I P
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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" f- R% F9 r' E) U l. u8 M ask roads [ set pcolor white ]8 p1 Q2 n$ {7 T! u4 u" x
setup-intersections
* t! X* P6 X# q" }8 P4 G3 ^ h4 |end
1 ^1 }! `: b3 q+ U/ y其中定义道路的句子,如下所示,是什么意思啊?4 d7 o4 t* i4 A& ^, o
set roads patches with. Y+ x8 g) m6 `6 V
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or2 D( Q I: Z9 u6 {. u* H! i2 l
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
& ~' F/ O3 ~( s' j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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