|
|
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。, f& L$ n* I8 q, ]
netlogo自带的social science--traffic grid这一例子当中,( Z; \' c5 u6 N$ d; U' ]0 {
globals
( K( s# F( y4 _9 E) q9 e[
; Q7 D* e5 t3 w grid-x-inc ;; the amount of patches in between two roads in the x direction
( B( G! b; ^6 |: Z grid-y-inc ;; the amount of patches in between two roads in the y direction) R+ i! y; c% v$ I3 e
acceleration ;; the constant that controls how much a car speeds up or slows down by if
9 U: p }! a; Z1 H: g ;; it is to accelerate or decelerate
: h# X: U& W+ z8 y* g phase ;; keeps track of the phase/ O5 ^- B+ } D0 K: X$ h
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
- H' D, A2 ?" ^! R5 J current-light ;; the currently selected light m) w6 [0 l+ y; z. i5 o
2 ^- w" X& o6 q O3 k
;; patch agentsets& s1 ~7 `" C, A+ t/ Q. P$ H5 \
intersections ;; agentset containing the patches that are intersections; `& N. \& Z8 l" \+ f
roads ;; agentset containing the patches that are roads E1 d5 A9 G( k& C. K: K
]
2 E2 T6 D9 y% m# \) X8 T- o8 t+ i8 i
1 A* a9 G! n& I; G. @! k! p Y3 Pturtles-own
; ~+ [8 Q5 {. g( C- d0 b2 ][
& B8 M* d/ F' ]& m" X+ y# S6 R speed ;; the speed of the turtle
) q/ ~1 B1 ^$ g, c9 h# {: W9 ` up-car? ;; true if the turtle moves downwards and false if it moves to the right4 F! ]. k. Y* K% E
wait-time ;; the amount of time since the last time a turtle has moved
) x" f3 q7 f6 J' [/ m3 l# A8 I]
1 a2 q; D/ ~$ C- O3 M$ @* ^3 w9 i
4 X- o6 X, J$ G$ d% b1 A! v0 }: Zpatches-own; J* j( \* ]1 F
[# M& ~0 W R/ Q. I( z$ h Q; q' S
intersection? ;; true if the patch is at the intersection of two roads- T9 q8 G/ [9 A# V0 ]7 k
green-light-up? ;; true if the green light is above the intersection. otherwise, false.0 g W( {; d" ]6 y( G$ s
;; false for a non-intersection patches." H" R1 h: S) J% l; r0 e H. \
my-row ;; the row of the intersection counting from the upper left corner of the( V! N# _8 g- ]9 u1 i
;; world. -1 for non-intersection patches." B- W; L5 {2 j- }
my-column ;; the column of the intersection counting from the upper left corner of the- K0 V0 b7 E5 Q- o6 l
;; world. -1 for non-intersection patches.6 k8 F7 Z# s$ }, W) Z$ J
my-phase ;; the phase for the intersection. -1 for non-intersection patches.: Y% m' H1 z+ v/ I9 C6 V
auto? ;; whether or not this intersection will switch automatically.' i% Y+ Y9 r$ V0 F4 l2 U- t
;; false for non-intersection patches., n: w2 M+ S5 J, [
]
) k+ h0 y) o# |
) l0 p$ S$ ?1 C' |1 B) Y, g! Q" A! J8 _
;;;;;;;;;;;;;;;;;;;;;;
' X8 R5 U+ q, `! }$ u& Z( R, m;; Setup Procedures ;;" Y3 f" D1 a% ?, }1 h
;;;;;;;;;;;;;;;;;;;;;;
' L2 T: y Z& C) ?
, u6 g3 L* o4 l+ e# X;; Initialize the display by giving the global and patch variables initial values.
( |: A+ p! f6 ^" q( e% j;; Create num-cars of turtles if there are enough road patches for one turtle to) h- L( X$ [ N: l3 A4 s
;; be created per road patch. Set up the plots., T4 {5 c' A y4 o, G9 h
to setup% d2 W: O# h: }: I
ca
4 ?9 Q0 w, p% Z5 X' s: y setup-globals
: P+ l/ r5 w5 X# G8 K0 E1 b& W5 P7 `& d
;; First we ask the patches to draw themselves and set up a few variables
$ d+ W5 X+ W( N4 f/ z6 ? setup-patches9 P! e) X4 L9 J% t
make-current one-of intersections
: Z4 V9 K5 M- A% T0 m! C3 [; @ label-current8 a; Q% p% }) K4 b1 o6 }0 n; I
5 h0 k: w! s; _8 h/ u8 h
set-default-shape turtles "car"
% u# u- P1 {! U4 G
' D0 t3 x! |" l if (num-cars > count roads)
+ D' B8 j( Y, ^. d [
0 m% V8 e- R% O1 J user-message (word "There are too many cars for the amount of "
, i* J5 x& l6 o& ^ "road. Either increase the amount of roads "
: c; P* H1 V& \, n: S% A! @2 R "by increasing the GRID-SIZE-X or "8 C% i% Q' k w2 H# h
"GRID-SIZE-Y sliders, or decrease the "+ X4 \: }7 b) y
"number of cars by lowering the NUMBER slider.\n"5 {* d' n! z. |$ S! e \0 k
"The setup has stopped.")2 V0 f" T9 B5 k2 P/ } N
stop
( p6 h1 `1 h5 o! d( t, T9 Z9 e ]7 E! j- c8 c; N( _2 R
, Z T1 P+ u( z7 f M: A ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color4 {$ N1 u* r( D- w2 f- K$ O
crt num-cars
7 v6 }/ x( D: M E7 [5 g [
' ^: b: s5 Y2 f" p4 n" u: S setup-cars
. S2 G) e* T. ~) o# W& B7 Z3 ^1 ^, y set-car-color" a3 K( w8 C/ S7 K* o0 k. D
record-data& c% t( c3 d9 L2 _. X
]
5 f3 X: I1 Y5 i4 p/ S9 S! J% c* j4 B" w# C/ f
;; give the turtles an initial speed0 f$ M; g7 ?4 j, {( ?( @! w- C
ask turtles [ set-car-speed ]5 ^6 u# ^% q( y \+ ]0 l
3 P9 L, c. H7 u- _ reset-ticks8 @! f6 R! B) a% r
end9 k7 W) @- `9 l8 U! s2 r
3 ]1 M8 Q. g ^$ e0 L% Z
;; Initialize the global variables to appropriate values
6 y4 Q. p) ` c! @to setup-globals
# A0 e# ?# i3 J) |- f; m4 ^% ^5 }* { set current-light nobody ;; just for now, since there are no lights yet9 L# ?5 R1 P) H6 n' Q7 e [3 s! H
set phase 0
) S9 n0 \$ R& w- r0 C set num-cars-stopped 04 G* [: F5 k- ]
set grid-x-inc world-width / grid-size-x( l* B) J' C- e9 N6 O
set grid-y-inc world-height / grid-size-y
' s! f" y6 A! [$ U, X) N0 u) z
$ x1 x/ q$ J4 j2 ?( r& \ Z; S ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
N2 j2 L, J) x1 K- z set acceleration 0.099
+ a8 u: ?( G, j5 K( d$ O: {& b$ j9 dend
?) ]6 z: H& l+ v7 v0 u/ [( k3 F- v. \9 x( _ M; A
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,# ~3 ^+ l; m3 G! G P& P
;; and initialize the traffic lights to one setting
2 F% p, a6 Z, b' Hto setup-patches
& n& s. I2 ]6 i1 F ;; initialize the patch-owned variables and color the patches to a base-color
0 `3 @& B7 F! c1 e- ^0 ~. s/ o ask patches
0 N r P; I9 ~( c9 w0 }# t [
J% y; T' t7 G2 b6 U. z$ J! N set intersection? false4 A) G+ y, G" Z7 J, e
set auto? false3 c# N A2 `& Y6 F2 t
set green-light-up? true
) F: ~& e3 A9 e+ }, v& [ set my-row -17 A/ ]3 V5 {& D B1 j9 v
set my-column -1
- Y6 j$ r. o1 ^* d- { set my-phase -1
7 r1 w7 |8 i8 g( E set pcolor brown + 3$ }9 q5 l# y* R
]
" M1 L; U% O0 [! m2 |$ J8 N( I/ O
0 {8 f/ _! h; ? ;; initialize the global variables that hold patch agentsets
4 I, K1 C) Q' p- v set roads patches with
. a2 f& r- v) ~( G [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
/ H. `8 f- o! ~5 u* R6 G (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
$ D' S" H4 a) h0 P4 t6 `# ^5 l1 |3 p set intersections roads with; f! r, `! j$ n9 w
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and* l6 L8 Y# `4 m4 o3 ?1 A
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 Z( @9 ^6 f4 @8 t( P3 S/ f* q5 [* O
ask roads [ set pcolor white ]2 F' W. d) B" q
setup-intersections" X7 Z6 @1 q* c2 d' x
end
, {, |& w9 ?" O0 Z' A3 a8 i其中定义道路的句子,如下所示,是什么意思啊?, \6 B* S5 K7 M" y$ }: U- `' A2 o
set roads patches with5 m; A- c; r) ?' x
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or$ \2 X; @( O. U% {: N, S
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
3 S7 c. z5 Z" M# I5 z1 x! Z 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? |
|