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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。
: A, c( z: E1 J0 z( jnetlogo自带的social science--traffic grid这一例子当中,+ J0 n9 h* p W7 {5 @: m
globals' u p2 I* E3 d" l3 v) [- y2 l
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grid-x-inc ;; the amount of patches in between two roads in the x direction4 b0 s. ?5 x) p9 P, e1 Y
grid-y-inc ;; the amount of patches in between two roads in the y direction) C( s* L6 E3 g4 O! _3 \
acceleration ;; the constant that controls how much a car speeds up or slows down by if. m' y! ^' ~0 _( k2 o& C7 h4 C
;; it is to accelerate or decelerate: f! d5 W$ v: t+ O" Q3 n
phase ;; keeps track of the phase
* |9 v. b' ^ I2 q num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure2 g, R! n6 r7 r% |0 v
current-light ;; the currently selected light
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;; patch agentsets
: o# g( z' x& ^5 h; a7 K8 w intersections ;; agentset containing the patches that are intersections
3 |7 K" }" u' w8 H' v roads ;; agentset containing the patches that are roads
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3 J C4 B* O. N. Gturtles-own& h( t* k4 _( k4 C n2 g
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speed ;; the speed of the turtle. O+ W6 D7 `$ ?0 o' V; y2 K
up-car? ;; true if the turtle moves downwards and false if it moves to the right- \0 F$ O: Y0 }9 ?# p
wait-time ;; the amount of time since the last time a turtle has moved1 K4 v2 a* V: `7 e
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patches-own- Q) _; A% Z5 J3 ]0 X* p+ w2 h
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intersection? ;; true if the patch is at the intersection of two roads2 W. U0 k5 t2 I3 h7 C6 `7 b0 s' D
green-light-up? ;; true if the green light is above the intersection. otherwise, false.% S _4 J# d' Z! Y8 P0 k( H# {
;; false for a non-intersection patches.
' X/ P/ ?7 E; h0 @ my-row ;; the row of the intersection counting from the upper left corner of the; v( j* O1 h p' @- \
;; world. -1 for non-intersection patches.3 I/ z" F1 p& o9 n! Q
my-column ;; the column of the intersection counting from the upper left corner of the, A4 b$ X2 X E5 j9 m
;; world. -1 for non-intersection patches.) E- w3 Y0 A) c' N# C6 ]
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
4 z0 x6 l% G+ ` auto? ;; whether or not this intersection will switch automatically./ R+ `/ p/ h& s2 u( M7 L
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
% h& o2 v$ r+ K;; Setup Procedures ;;
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;; Initialize the display by giving the global and patch variables initial values.
% r$ b5 g# ^+ R1 }0 d;; Create num-cars of turtles if there are enough road patches for one turtle to
7 j1 n- P& M. ~; a;; be created per road patch. Set up the plots.& A I7 l6 x4 ?- r% [
to setup* x5 v2 o1 V; N4 P+ J/ z
ca
; h) g7 x) i* ? setup-globals; W2 x6 N. O& g, I
( {2 z9 F; M& X5 P- h ;; First we ask the patches to draw themselves and set up a few variables
3 Q2 k _. H' c2 f c. W setup-patches' W$ O7 {8 j/ l3 ?9 Z e' p
make-current one-of intersections% w6 d% m q# G1 z8 K& G' {
label-current$ }4 A2 V6 T" {" C1 k
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set-default-shape turtles "car"
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7 c, q' M% ?2 f* R: ^) s3 t$ P if (num-cars > count roads)
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6 H" t* J4 C0 h/ e user-message (word "There are too many cars for the amount of "4 G2 S2 `' q6 I! V6 `
"road. Either increase the amount of roads ") h8 F0 z7 W. y2 M
"by increasing the GRID-SIZE-X or "+ P& v0 ]: q" A' g
"GRID-SIZE-Y sliders, or decrease the "9 [# b$ h1 W) j2 V: c4 L
"number of cars by lowering the NUMBER slider.\n"- Q: G5 D k" |; \' F/ H: j
"The setup has stopped.")
% ~" L7 D% @+ D stop' j2 u3 N5 C+ i: V- y. r
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
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3 {' z3 e- E- X5 v# f. A: g9 L setup-cars$ D5 g$ H- {7 ^* P c- X2 E
set-car-color; f7 c: q4 |2 X
record-data
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;; give the turtles an initial speed, r0 T& v9 Z. r* z, C; }
ask turtles [ set-car-speed ]$ N! l) {' q0 o8 Y
1 q7 Q- p4 w/ t' F reset-ticks
% w. J6 T% H5 Xend. A$ r/ d# P7 I; F
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;; Initialize the global variables to appropriate values
% |$ h6 S% T X& Eto setup-globals3 X- M: i& ~3 V, ]4 `9 C3 N
set current-light nobody ;; just for now, since there are no lights yet
9 w. x! N9 ?# Q- G. Z set phase 03 ?* Y1 \5 \3 \9 C2 C% @# d
set num-cars-stopped 0( K, ~" S* t4 B/ S
set grid-x-inc world-width / grid-size-x
! s; h% t% ^8 Y M5 a 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# G% ~. _9 @+ [2 l2 C/ B; U. h3 {
set acceleration 0.099" K5 N+ g1 B5 ^
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
% v2 [, N$ ?5 y8 J+ {;; and initialize the traffic lights to one setting- w3 D5 f! B3 g+ x8 r% o0 c
to setup-patches. c S# h p @$ z
;; initialize the patch-owned variables and color the patches to a base-color0 C3 m* ?% X/ N
ask patches
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set intersection? false; ]( H! Y% y1 x5 |/ Q
set auto? false2 z5 v, m- E1 |/ W8 A
set green-light-up? true$ V# X$ b5 _9 ]5 x1 X2 l: h1 @
set my-row -1
* O4 c; I7 _0 o, j set my-column -1
" c' U N2 ^! U: k9 B set my-phase -1) ]6 F3 N5 `- j6 W0 s$ B4 M
set pcolor brown + 3, e, s. J$ }, x3 T" j! s
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* P. T! C& J3 E ;; initialize the global variables that hold patch agentsets
$ a/ y+ T- E# U( L b set roads patches with0 {' v6 s: C. b; I9 Y
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
1 L% F E- q$ ~ S2 d- X% L (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
- H5 x3 J2 q& N8 g7 I set intersections roads with
4 j$ e, H( q& `% R# p6 y3 ] [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and; e$ X5 Q. d9 h p3 z
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]+ q/ S* r# [6 s {
% G- T- O$ x( G/ b: { ask roads [ set pcolor white ]1 u4 f8 w9 W4 Q1 l
setup-intersections
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5 d& k8 X. F8 P1 U9 _其中定义道路的句子,如下所示,是什么意思啊?
( o6 F! n! O( T$ L set roads patches with
9 B! ~7 u+ Y( r" c& B0 v [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or9 I' l7 _ i% r# {" f
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
% Q/ M6 U1 [4 G& D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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