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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。$ ]. J5 g+ e( _
netlogo自带的social science--traffic grid这一例子当中,
& d& W; s. F( q5 dglobals$ p% Z! p; m. R0 A
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grid-x-inc ;; the amount of patches in between two roads in the x direction
5 t/ t" a& l! u: n! ]+ b# h" }: | grid-y-inc ;; the amount of patches in between two roads in the y direction
v5 V7 D0 x0 m acceleration ;; the constant that controls how much a car speeds up or slows down by if
9 [+ f* q/ [7 Y% a ;; it is to accelerate or decelerate
5 D7 G+ P- m; v+ X phase ;; keeps track of the phase
9 F$ \. n, v. e& {8 r9 R8 } num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
% H2 `! t3 v/ Z: V current-light ;; the currently selected light
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;; patch agentsets
9 _* K; P; I% `' h. c/ [ intersections ;; agentset containing the patches that are intersections# ~" y- I, g2 p( l7 m
roads ;; agentset containing the patches that are roads2 o) y! C' V7 O, F
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; Q$ u& T% y+ x* ^/ u9 w6 cturtles-own) |/ P$ e2 j& E& g6 u
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9 a& a+ O" }* `4 R) J+ f! p+ p speed ;; the speed of the turtle4 }, q- j, [$ [6 `9 O
up-car? ;; true if the turtle moves downwards and false if it moves to the right# N0 H+ D1 U3 l0 k( P( B# w
wait-time ;; the amount of time since the last time a turtle has moved# R! N5 d0 y* w( F8 [
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" u6 [6 q) k5 a( x$ r3 W2 jpatches-own
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intersection? ;; true if the patch is at the intersection of two roads
: s" ]. N0 Y9 e" a; r* i$ ^& l green-light-up? ;; true if the green light is above the intersection. otherwise, false.
- u! p9 m. a7 @8 M2 l1 n# x8 g ;; false for a non-intersection patches. ]) A* _/ \3 z2 h1 }2 P
my-row ;; the row of the intersection counting from the upper left corner of the
; C+ f# a" a- { ;; world. -1 for non-intersection patches.0 I# L& i. C, S0 ], N. p
my-column ;; the column of the intersection counting from the upper left corner of the
1 X7 f6 v3 L! p" D. Q! a ;; world. -1 for non-intersection patches.
, J# l* i2 `7 X8 y4 V% I5 H, f my-phase ;; the phase for the intersection. -1 for non-intersection patches.
( Z7 F6 T) C" s, ~% g auto? ;; whether or not this intersection will switch automatically.
: k2 X3 N; V% u* x4 H0 t! }& ^( i ;; false for non-intersection patches.9 l8 O6 F! m+ S; Q
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( X6 K1 p) K* ] {, G+ |) L;;;;;;;;;;;;;;;;;;;;;;
l3 A2 Q) ~! n; d9 Y;; Setup Procedures ;;
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;; Initialize the display by giving the global and patch variables initial values.2 x4 ^: a) u" L8 @( I& G* \# V9 D
;; Create num-cars of turtles if there are enough road patches for one turtle to
: v+ a' P0 [+ a# _. u" p;; be created per road patch. Set up the plots.
F( ], V0 s. M: E$ cto setup
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setup-globals w# B6 G) j& E
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;; First we ask the patches to draw themselves and set up a few variables
0 i4 W6 }7 J' s0 d) r setup-patches
, A5 s" N1 i1 r make-current one-of intersections, k4 F) X' `+ f0 F# {5 C
label-current; o8 \7 N$ b9 c3 V/ W& Z
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set-default-shape turtles "car"
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1 o/ A$ o9 {& h# d5 y if (num-cars > count roads)0 |8 P' q2 R1 l8 |; E8 [. O" `! l
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2 N( _6 g' P# C8 Z3 y user-message (word "There are too many cars for the amount of "9 }, J# i- {( y! s0 [% S% n x
"road. Either increase the amount of roads "$ x5 q4 o6 P: {: R' b( T; t) [% b7 A
"by increasing the GRID-SIZE-X or "6 u) |" I9 O. L9 c. P& R' h
"GRID-SIZE-Y sliders, or decrease the ") {. n) R" W& E& a# I6 u
"number of cars by lowering the NUMBER slider.\n"
( [6 n9 @5 j; n$ a' e6 J$ U "The setup has stopped.")! D f% k% t. }. N( Z! W7 v) q
stop. l5 Q- h; ]( j# s( W
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4 ]" F% r1 Q x ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color8 ^' ^6 G1 ?4 u# m8 H/ t# i7 C, Y
crt num-cars3 ?& x1 N* K F
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$ n/ y* G6 Z, u5 |9 }. D% _ setup-cars
% n$ R' T) j5 o7 w$ f. H2 i4 ]: k set-car-color
" M: t# V) c, H% D! `; { record-data9 o3 n" C: k! p
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;; give the turtles an initial speed- H' Q; v/ @/ \# i* C; V# k! @) @2 {# H
ask turtles [ set-car-speed ]
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; o3 S5 z/ p/ I reset-ticks
. ]0 N7 R2 X6 R7 w, iend
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;; Initialize the global variables to appropriate values
" L1 Y- O9 r7 J0 i$ Z: O5 L# Eto setup-globals
. x, o2 S1 N% }1 F0 @/ ~5 g& r set current-light nobody ;; just for now, since there are no lights yet
7 K1 [& D( J8 D" Q set phase 0
0 ^& q! u0 I1 x% b3 a set num-cars-stopped 0
) `2 }' F+ o$ Z/ P4 O+ K) @ set grid-x-inc world-width / grid-size-x- Q C. {- t! S. I* x$ 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
9 M* G: }" K) k t' F% R set acceleration 0.099" _: F+ A) s9 m& H( ]% R# i
end b5 Q1 s" ?/ U+ \" j
/ w, s8 z+ O: K8 A* T% O, };; Make the patches have appropriate colors, set up the roads and intersections agentsets,
: M& {: v$ t3 |* g; U8 M: Y;; and initialize the traffic lights to one setting# h- e; X9 F- F: ~3 W( E4 ]
to setup-patches6 v' {% E! e: l8 P
;; initialize the patch-owned variables and color the patches to a base-color* m) e2 t1 [ [* l, A. _1 V
ask patches! ]$ V! ?3 [5 A7 f4 }+ }
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set intersection? false
( E7 [3 e* u7 P% c, ]+ l set auto? false, Q( U: `2 S: i7 f* S
set green-light-up? true: _2 D: c5 k2 S8 @" b: x1 v; w* G+ n
set my-row -1' d7 n- ^6 N* l6 C" t* B5 j
set my-column -1+ |" Y2 e6 O1 a+ a& V) M5 L9 ~& k
set my-phase -1
7 i+ V7 j2 S" F; H1 w5 c set pcolor brown + 3
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* n. J5 K3 K% r& |3 u: U2 k( W) } ;; initialize the global variables that hold patch agentsets% T' \& l8 l' { M
set roads patches with
7 D+ K/ j. I- }" | [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
, s9 m" G% O( n: e2 O" q8 K. u (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
O: k3 ?5 e/ M8 y e! t set intersections roads with( V. Q6 l6 {. m, q6 d7 V# W
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and2 c; ^7 O- x6 I) c
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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/ G: e! a! T/ ` ask roads [ set pcolor white ]5 x) B0 u6 U, Y8 Q( x: }% f! X
setup-intersections
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其中定义道路的句子,如下所示,是什么意思啊?: I; P( [5 v, G/ a
set roads patches with
' n7 [: i6 Z# w [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
% H7 a8 ]' c p" B (floor((pycor + max-pycor) mod grid-y-inc) = 0)] u# i* }' b& q( \- A
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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