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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。) t3 c# |/ H* |' s8 y' p1 _
netlogo自带的social science--traffic grid这一例子当中,' S0 [- w( c, @' x
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction5 j1 r% J8 r p$ A
grid-y-inc ;; the amount of patches in between two roads in the y direction/ O" O) B( W+ o1 X4 U! Y
acceleration ;; the constant that controls how much a car speeds up or slows down by if; Y- ]' k* M P0 S
;; it is to accelerate or decelerate
$ F' {0 D( @' T( x* r9 h" Q4 W! H2 A phase ;; keeps track of the phase
4 O9 J( H' K- k2 F) Q num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
9 _& f/ u! O% R' O: o* h9 o current-light ;; the currently selected light ? Z j a( g8 H
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;; patch agentsets# G$ ~0 N* J+ P; B5 Z) Y# K3 X
intersections ;; agentset containing the patches that are intersections
+ Q, F3 ~8 a: I( z3 U' |0 i roads ;; agentset containing the patches that are roads
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turtles-own p9 z, S- g7 r
[
1 w. o- j9 v5 v2 d( E( @) J speed ;; the speed of the turtle! }' I% A$ R% i- E" v
up-car? ;; true if the turtle moves downwards and false if it moves to the right g( a" Y' q/ ?. q: M E5 Q
wait-time ;; the amount of time since the last time a turtle has moved
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* i; \& }4 a( n8 A$ Gpatches-own2 d: O8 {) O# M3 B% ~# X7 p7 ]4 r
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intersection? ;; true if the patch is at the intersection of two roads
+ }3 j2 k. u2 }8 N- y green-light-up? ;; true if the green light is above the intersection. otherwise, false.
9 y* R* J/ J+ {. [7 b# a4 S3 B ;; false for a non-intersection patches.8 e4 B6 ?9 {3 ` |. Y; |! n9 h
my-row ;; the row of the intersection counting from the upper left corner of the
" K, u* p# Z6 I5 |9 | ;; world. -1 for non-intersection patches.
y% }# G1 C1 @4 c my-column ;; the column of the intersection counting from the upper left corner of the
- \3 `3 v& q8 H4 [ ;; world. -1 for non-intersection patches.
! f* F1 r. ?5 h+ C Q8 k my-phase ;; the phase for the intersection. -1 for non-intersection patches.$ Y/ A3 ]2 m* E9 Q
auto? ;; whether or not this intersection will switch automatically.6 l( R" w h U
;; false for non-intersection patches.# t+ V# Z5 T: p1 V9 c# t
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" |$ a9 G7 r5 ?1 c9 t. F9 s;;;;;;;;;;;;;;;;;;;;;;
: O/ t4 O# w2 R6 [5 ~7 `* x;; Setup Procedures ;;9 F2 v. {& U) y% L6 \% c- |4 m4 E/ b
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;; Initialize the display by giving the global and patch variables initial values./ F: Q; u' D: b
;; Create num-cars of turtles if there are enough road patches for one turtle to
8 X1 Z" i3 d w% y;; be created per road patch. Set up the plots.; x' l3 V J5 b; Y4 ~7 D+ w8 U! W
to setup
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7 p) m$ a! R( t4 [% n6 W setup-globals4 f. d$ _ Y" r5 g
+ s- h0 E5 ]( @0 a! K, Y2 x ;; First we ask the patches to draw themselves and set up a few variables( }. u$ i" k, H
setup-patches0 l$ ~" o/ q9 A0 B0 b% s& }$ @' V3 ~
make-current one-of intersections, w2 ` H0 L$ w$ @2 t
label-current. V6 I4 Y) Q0 ?7 }( |( v$ P
- T' U' U0 J9 t5 \; X! `( a) G set-default-shape turtles "car"2 _6 R0 A+ e% g) A
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if (num-cars > count roads)4 a. d5 d' ~1 T# D
[
% @1 [! r c" o user-message (word "There are too many cars for the amount of "* G$ t$ @- Z, |" {# s# V
"road. Either increase the amount of roads "
- g4 S* ]. G0 N: B "by increasing the GRID-SIZE-X or ": ?6 Z) F! R( {# o0 C) h1 \/ K
"GRID-SIZE-Y sliders, or decrease the "
' F) y @* k; P "number of cars by lowering the NUMBER slider.\n"
! j2 f7 Q; w$ z$ ~+ E6 n9 p9 X3 F "The setup has stopped.") H- F4 G% d7 R9 \& {# k2 J y" L
stop
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5 d1 c' w+ F/ C( s& p; Q V ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
, L, @& ]9 v, m3 l crt num-cars
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; s5 H) z- b6 n: t) _5 c8 W; S+ r7 L0 D setup-cars5 a. ]3 u# \: i8 E, B
set-car-color8 F$ {0 Z2 H; U1 c1 U
record-data' ] i" Y1 G8 S$ Q
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;; give the turtles an initial speed
7 a( w2 E: r+ Z! M ask turtles [ set-car-speed ]
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. Q1 S) L0 J4 g8 |, ~, R reset-ticks8 Z7 T1 P& {- o* i& A8 F: ?
end; v6 r5 E3 L) b: g8 }2 N) ]4 k
% e* ?$ z; U$ c;; Initialize the global variables to appropriate values5 ]( c4 H0 l6 D* J$ [
to setup-globals- T, a3 H+ l( e# J
set current-light nobody ;; just for now, since there are no lights yet$ X, W& R( \- e
set phase 0
- p( Y' X" T7 _5 n& S set num-cars-stopped 08 E& v" W0 p' p) ~
set grid-x-inc world-width / grid-size-x
- q9 \' q/ K# A( [1 H set grid-y-inc world-height / grid-size-y4 J/ m* Y8 c+ g0 ~1 Y8 L X) ~
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary9 E9 o) z6 z/ R; w! s
set acceleration 0.099
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W4 q) M+ i. @! M& _9 }, z;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
" @: c0 K- k0 Q5 h4 A;; and initialize the traffic lights to one setting3 [+ ^& j% q2 [
to setup-patches6 O; Q4 Z& R) q/ O3 P, d" k
;; initialize the patch-owned variables and color the patches to a base-color
( z1 [$ S; k$ | ask patches
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* p9 t) i5 |( N% E: W7 S2 ]- w/ g8 B$ h set intersection? false
5 o w* S2 n5 z1 z4 _# } set auto? false
: B7 W( I2 o7 t6 z set green-light-up? true
) Z+ x- y( z( R2 V: ]/ M set my-row -10 [1 J; g& @0 L7 R
set my-column -1
- G3 z$ E) a6 Z! r, t( _ set my-phase -1) m3 I( A0 n; v% I" R
set pcolor brown + 3& a# J0 D& M: ?( s. ~" @8 t& g
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5 Z2 [( B, m+ U! Y% R+ F! I ;; initialize the global variables that hold patch agentsets
0 z6 n1 t/ u; v9 j set roads patches with
& R1 C* E5 q1 L- b' }/ v" G [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
& A3 O g! _! B4 J7 m (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
0 q7 f; s: O4 V1 f3 w9 a; | set intersections roads with
" b: N1 d. v# w [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
0 \* n$ O% E5 ~8 k+ v (floor((pycor + max-pycor) mod grid-y-inc) = 0)]1 [8 X! W C, |' m
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ask roads [ set pcolor white ]6 H! I1 Y1 o" v
setup-intersections7 ]2 [0 T1 [8 R6 V4 H
end
3 S$ U0 i2 J6 q; J3 S1 [7 U1 U* \其中定义道路的句子,如下所示,是什么意思啊?" ~1 M D! r' N& i6 J
set roads patches with
, `+ `0 a' F- z) T [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
) N: k5 E' U* b (floor((pycor + max-pycor) mod grid-y-inc) = 0)]/ v" Q, e* o' k1 `1 z$ J
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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