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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。# E: x3 \! `* j6 v5 h1 l
netlogo自带的social science--traffic grid这一例子当中,* S3 A7 P" O# S' C; q
globals0 g7 F1 _/ c# e' K7 p
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grid-x-inc ;; the amount of patches in between two roads in the x direction6 h. P7 e4 N8 L. t" R' ?
grid-y-inc ;; the amount of patches in between two roads in the y direction5 G2 t9 C/ Z5 n: @) p R
acceleration ;; the constant that controls how much a car speeds up or slows down by if" Q6 \- |% q- g% @9 J* D3 f
;; it is to accelerate or decelerate
8 A+ Z; l: F: ~) h s) c7 `" L& R phase ;; keeps track of the phase
0 H: e4 x: Y5 {) o( A! A num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
- b9 O+ l2 [; N# O* u% e) [/ p current-light ;; the currently selected light
3 T; [( j5 x6 i1 w2 |# b q! w0 o; q s
;; patch agentsets( |. U8 \7 E: w( t- P7 y5 V& D
intersections ;; agentset containing the patches that are intersections
7 n+ T& D% s2 z2 G& P roads ;; agentset containing the patches that are roads" [/ t( `. A* H" l$ `: {/ I! r5 g7 u
]
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turtles-own% O9 U$ I+ m4 R" W& |. U
[
% L4 D! }) @ t6 E8 Z. A4 h speed ;; the speed of the turtle
3 ^% x( c. ^- w: t% u6 a up-car? ;; true if the turtle moves downwards and false if it moves to the right
- q3 D- Y5 _5 a wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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F' Z7 I) k7 }" l8 u intersection? ;; true if the patch is at the intersection of two roads1 {! E' J; d$ H7 i
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
2 k6 S6 I6 w: c7 A ;; false for a non-intersection patches.# @) A9 M; u$ V1 b$ C; i
my-row ;; the row of the intersection counting from the upper left corner of the- `' F5 N: e3 T1 c
;; world. -1 for non-intersection patches.7 q: t7 E9 t% w9 `0 ~
my-column ;; the column of the intersection counting from the upper left corner of the
& i- }8 {& c$ L. p& U9 ?" n ;; world. -1 for non-intersection patches." ^. Z" U) K8 X* s/ o- O. B$ }8 h
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
7 R* e+ ]( ^( G) C auto? ;; whether or not this intersection will switch automatically.& D1 F4 W3 q3 V, p- n9 w
;; false for non-intersection patches.3 k9 |& @& N2 C6 L/ I
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;;;;;;;;;;;;;;;;;;;;;;
- f$ B: c1 F* N$ };; Setup Procedures ;;
+ d" U. z e9 k;;;;;;;;;;;;;;;;;;;;;;
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! _* T; L1 t( |& m+ p- j;; Initialize the display by giving the global and patch variables initial values.& r9 n8 _- S6 Q2 ]2 W/ I
;; Create num-cars of turtles if there are enough road patches for one turtle to( ~ h1 f: e! T* P
;; be created per road patch. Set up the plots.
' N* p# V2 ]4 D9 D0 L" E ~1 \to setup; O) `& O& D$ B+ j, y
ca- a1 I8 E5 v+ U/ d$ I
setup-globals5 X9 L0 R# Y9 y/ Q6 s# G
# ~1 _5 } g$ ^1 I ;; First we ask the patches to draw themselves and set up a few variables
: v! t9 l# d3 n# g/ U( D setup-patches
/ s" |& M q9 ` make-current one-of intersections, S# ?1 f+ {! y/ d: M) t' A& A& q: N6 [
label-current
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4 y0 s3 q) Y# f4 t set-default-shape turtles "car"
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if (num-cars > count roads)
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6 J. y2 q' q5 X0 Y user-message (word "There are too many cars for the amount of "
[, q% D1 u- _ "road. Either increase the amount of roads "
4 z6 W8 x2 ?7 C. e( L "by increasing the GRID-SIZE-X or "
# j* Y# \ P" l2 T# i' q% K "GRID-SIZE-Y sliders, or decrease the "" N4 b2 D# j l6 P# R+ n3 ?& b1 J+ F
"number of cars by lowering the NUMBER slider.\n". k, E9 c! K* ~ C
"The setup has stopped.")# o: _9 c9 A3 O5 Q
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
) V# w/ _- i% w/ B5 m8 |% u crt num-cars
, w3 N1 B2 Q# {( h [
2 _# o- w ?! M* B1 W- { setup-cars
# w+ u8 F0 a+ z6 y" _ set-car-color
5 Y4 @' t6 s% c4 c4 X record-data
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;; give the turtles an initial speed- F1 R( D, K* j1 `$ B+ [6 t4 L* y
ask turtles [ set-car-speed ]1 _' G: a% a4 g& X
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reset-ticks/ l7 P+ E3 A, ~/ b
end
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2 M, I1 n$ [+ E) I/ l;; Initialize the global variables to appropriate values
9 D/ h/ f8 a% e+ i" \to setup-globals6 g8 w8 i. {2 z6 x8 c
set current-light nobody ;; just for now, since there are no lights yet" a% u7 ?$ s2 J3 j! t8 M1 l
set phase 0
6 g; S' p. s" D: C! c set num-cars-stopped 0
4 U, v8 a( f' W W% p/ | set grid-x-inc world-width / grid-size-x
$ E Y6 }$ `4 k2 P& ]; U set grid-y-inc world-height / grid-size-y
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2 d2 e; F% {' r: G ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
6 z& b, k. F9 s% g, H0 q* R* p set acceleration 0.099& @& I0 s1 J! y" S% |
end0 p& a, Z0 V: |$ O
* Q" [' t1 Y7 b: w; M, V;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
! C7 N% l0 d7 g8 W0 {4 H;; and initialize the traffic lights to one setting% U, m' m! c# G6 N
to setup-patches l, A4 R* R. ~
;; initialize the patch-owned variables and color the patches to a base-color1 ~0 z; X9 a1 E6 o* M2 x
ask patches5 i; c8 O) K3 m& e) E" W5 a& d
[
9 R$ E% X- F6 O7 Y# V$ ? set intersection? false) g4 c( s- h. v3 h+ j+ P
set auto? false* |! m2 C0 M/ _
set green-light-up? true
# o3 z8 [) o" E8 ?# h set my-row -1- O) J0 G! X; I$ |) v i! `
set my-column -1
Y, j& B4 }6 o) l$ ~ set my-phase -11 C* A. F/ W- Z5 A! w
set pcolor brown + 3- I$ m: s$ b k ^* Z
]
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$ C! M; W) F R ;; initialize the global variables that hold patch agentsets4 r2 l7 D0 L. ?1 Q0 R
set roads patches with
0 E! D. C7 \( z( ] [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or4 f I. l" ^0 ]. O
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
+ e- e2 r3 X3 S9 } set intersections roads with
, I' A1 |! E% T) K- w [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and, _+ L# u9 ^0 n3 X" c
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
% y/ I" i% s6 r H setup-intersections
" H: @1 k, p% g4 P9 c; Xend
% z( n8 }2 N4 ?6 q& H5 q其中定义道路的句子,如下所示,是什么意思啊?9 {, _1 |1 c7 ^) A# W
set roads patches with& H. m# v( a0 N
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or0 h1 E6 z- I5 n( C6 U, q6 V$ H
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]5 V v3 { e. G& ^1 X
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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