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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。1 V) y# Q7 I9 s+ o+ n, ^3 C+ I/ I
netlogo自带的social science--traffic grid这一例子当中,
' l! _0 c) `# l' K5 }globals9 u& G' c) C1 y
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grid-x-inc ;; the amount of patches in between two roads in the x direction
0 a1 @5 p" K1 B/ F: { grid-y-inc ;; the amount of patches in between two roads in the y direction; C- \* @' A/ U( J8 E# [' [
acceleration ;; the constant that controls how much a car speeds up or slows down by if) b$ R8 w3 X7 B( {- T* ?8 ?& c) x' |
;; it is to accelerate or decelerate, E8 V6 W; e4 ~! b+ x0 s
phase ;; keeps track of the phase
2 T. x7 B7 y8 w, }4 P2 Z: a num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
0 _! G- ?/ {4 ~ current-light ;; the currently selected light
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;; patch agentsets5 N! @" G; I! i0 n
intersections ;; agentset containing the patches that are intersections# u+ p X" I' [
roads ;; agentset containing the patches that are roads
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turtles-own% N0 b3 ?" O& _( F' l' a
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speed ;; the speed of the turtle
& q2 P5 J% c! j6 n+ Q3 X" v up-car? ;; true if the turtle moves downwards and false if it moves to the right
( \, H& N5 F3 v) J wait-time ;; the amount of time since the last time a turtle has moved
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0 O. ?5 r+ V( s" |! ppatches-own; ~) f! _! U. I/ u
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1 {5 z; P: @% ?9 h, j$ [- ~/ n intersection? ;; true if the patch is at the intersection of two roads
$ E1 D) Z+ u- e( I green-light-up? ;; true if the green light is above the intersection. otherwise, false.( \' w; T0 z; ^/ E6 M6 t. ?
;; false for a non-intersection patches.' ]5 @) h/ {3 Y4 g( g
my-row ;; the row of the intersection counting from the upper left corner of the
6 V0 _" E7 }8 i ;; world. -1 for non-intersection patches.. @2 K) ~7 t5 `% ?% L
my-column ;; the column of the intersection counting from the upper left corner of the
0 h* F) e+ b3 L) v ;; world. -1 for non-intersection patches.4 W! J! G. h, r" W
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
s7 F/ j5 u6 t, ?* ` auto? ;; whether or not this intersection will switch automatically. Q" i: h* U6 R9 Q& |) Q) o
;; false for non-intersection patches.- t; F1 I x& F- [2 ]3 z* d! M
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;;;;;;;;;;;;;;;;;;;;;;
: {# B; I8 T* c4 B;; Setup Procedures ;;
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. O+ X7 K% f3 B# |' i/ v- |$ c* k;; Initialize the display by giving the global and patch variables initial values.4 ]) b: r/ r; w+ g1 Q
;; Create num-cars of turtles if there are enough road patches for one turtle to% ^& D. q l- f* t' Z! D, R- h- m3 N
;; be created per road patch. Set up the plots.
2 S# c9 p. Q8 U) s2 @( _4 R8 X7 Jto setup: [$ g- h6 e1 j* Y F$ o/ c
ca
" }0 W3 w( X; t setup-globals5 M' J/ C& i8 Y2 _$ a
9 k6 E; }/ g% ^# n ;; First we ask the patches to draw themselves and set up a few variables `8 I8 j# s3 H; y% g* h" T# U
setup-patches
$ S7 ~& }6 c8 ^7 o7 S% o' ~ make-current one-of intersections
{' L W$ _1 |) c label-current- v8 S8 \( z. ]! |# a. o2 l
4 s6 \0 H6 F5 j- F5 L C+ D set-default-shape turtles "car"- t! _ G! c! \9 ^7 b
8 O9 K2 T5 N) f5 O5 a if (num-cars > count roads)% o( F7 {2 b9 A+ c. ?1 e* B
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" H8 N9 k4 J) w A user-message (word "There are too many cars for the amount of "
" P+ d+ u z' D$ j" F/ D8 m; ^ "road. Either increase the amount of roads ") f5 m) t3 e/ R: i! J" [
"by increasing the GRID-SIZE-X or "
; b+ h# i% `2 |# F! {! T "GRID-SIZE-Y sliders, or decrease the "8 S* @0 r8 N3 A5 e. _7 _
"number of cars by lowering the NUMBER slider.\n"
4 H6 _! ]. ?( l% I% n6 h9 D "The setup has stopped.")
- A, O5 X4 T6 ^( V( C2 N stop
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% W2 U- B; u. {% J ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color1 K+ S) J4 C ^5 O; L
crt num-cars
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setup-cars
: h0 N& ?, I4 S; }! I# L$ Z set-car-color
- j! G! G+ A2 T, I record-data
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;; give the turtles an initial speed/ E* e) y* U7 H" a
ask turtles [ set-car-speed ]
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( Y' O( p! b& Q, U( H reset-ticks
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;; Initialize the global variables to appropriate values
! v8 `8 z" Q# f6 ~5 uto setup-globals
9 T q% v( P# ?9 n* W% R5 V set current-light nobody ;; just for now, since there are no lights yet, Z: ^1 E5 V5 C5 x5 V0 x. \- w
set phase 0
: N L6 K6 S1 W' N+ Q set num-cars-stopped 0
/ O$ n/ Z, G- |2 u6 L* X set grid-x-inc world-width / grid-size-x
+ L3 Z. H! W i& G) l$ I: L set grid-y-inc world-height / grid-size-y0 O Z: l) h3 B
+ N9 b( v* b# |6 y. E' m) |0 }4 Z" }6 X ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary" j+ _% e1 {4 }; u4 e( R
set acceleration 0.099. Z5 k9 a! z) j3 C! c
end
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% R# {1 v. B: c;; Make the patches have appropriate colors, set up the roads and intersections agentsets,9 I8 A, q( I+ c0 @- y" c9 Q. `
;; and initialize the traffic lights to one setting
; ^2 s( p1 F2 i: @" y" |, v4 i; _to setup-patches
2 q: p2 i9 U) ?: k- W$ D( Z* l4 w% ` ;; initialize the patch-owned variables and color the patches to a base-color
i8 a( y# E& b$ t5 N5 O* l: d" I# }, w ask patches. T2 w- G* j0 [9 P: Z- T+ l7 [
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$ @' J: z; a8 W' a2 D set intersection? false
. u/ t/ q, N3 G! ? } set auto? false: ~& ^6 C: _; u$ Q0 G: U
set green-light-up? true
0 i* O( f* B+ K4 Q: Z! d set my-row -1
5 [' }& F! [. n6 Z) g' K8 R set my-column -1
3 X% j2 `0 o8 s8 L4 O; [* c- | set my-phase -1
$ ]% s! @: ^/ p, A set pcolor brown + 3
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9 z( ?, S6 b3 [3 ?+ n$ i' K1 ` ;; initialize the global variables that hold patch agentsets
& N% P* Z5 c$ y set roads patches with
4 V$ d' W: }: h3 ]. w [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or8 X% z; c1 k3 N8 \
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]. }9 l. T) Y5 l; G. s- O
set intersections roads with. w4 `* A% [9 Q# ]- G5 z$ `
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
5 H- _+ W9 v! O& Y- P (floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 @) W9 i3 ?9 |
( L, T" Q3 |& `9 Y1 c ask roads [ set pcolor white ]
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; m+ Y8 B$ `& r* j其中定义道路的句子,如下所示,是什么意思啊?
+ H" W% M1 }; ^, I5 u4 n set roads patches with- V, i1 Y2 k% z. y% t5 S6 _9 i
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or" q+ [* l' j1 S0 F* |3 S, W4 z
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
1 M2 W' s, _) b8 @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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