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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。
" w* N" N$ v0 ] C1 enetlogo自带的social science--traffic grid这一例子当中,3 V6 j- M, g5 F/ B: r' r
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
, C, N# V" j& j5 e% }' Z H grid-y-inc ;; the amount of patches in between two roads in the y direction. N( [7 z( _8 k+ p5 n4 X
acceleration ;; the constant that controls how much a car speeds up or slows down by if4 Y0 L4 c$ G+ H2 K' Q: o5 L" H
;; it is to accelerate or decelerate
1 N( Z8 @) I7 s% L2 p/ R% \6 ]& y phase ;; keeps track of the phase
8 j7 Y5 s5 u) `2 O- ?7 c num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure& j9 S: M3 _4 r4 q5 D
current-light ;; the currently selected light
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! U0 G/ P" u# B ;; patch agentsets8 Q- @ e6 l% W6 t7 H+ E
intersections ;; agentset containing the patches that are intersections5 _+ M1 ~1 g1 n: B7 `' D
roads ;; agentset containing the patches that are roads( x8 x0 w1 V6 o$ W7 U
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turtles-own! S/ q) {; c3 S# O/ c+ z3 b6 _
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speed ;; the speed of the turtle
6 B2 _5 x2 k+ W7 \ up-car? ;; true if the turtle moves downwards and false if it moves to the right8 S6 U2 k! z6 R& f Z; d# H
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own3 ]* Q# {* I1 o" k$ s& q0 Q- F
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. r8 C, j' p7 R7 N: Z5 G9 P& {, ^ intersection? ;; true if the patch is at the intersection of two roads
3 q( K9 ~: v6 _+ c green-light-up? ;; true if the green light is above the intersection. otherwise, false.
* ?+ _& ~" x2 T4 g; g, T. x ;; false for a non-intersection patches.; S: H6 I2 u8 D: Z) g+ z- r
my-row ;; the row of the intersection counting from the upper left corner of the8 E7 s6 y1 m3 S, i- N% M' \& O7 q* O
;; world. -1 for non-intersection patches.' T3 P! e; M& P! P( ?+ W8 `4 Y
my-column ;; the column of the intersection counting from the upper left corner of the& ^; e4 c' d* _6 I9 O' f
;; world. -1 for non-intersection patches.
3 f% J3 D: |. x) z my-phase ;; the phase for the intersection. -1 for non-intersection patches.
$ [+ y2 S5 G0 x( L1 {+ w auto? ;; whether or not this intersection will switch automatically.7 O/ N, h1 t0 g w0 ?1 T/ T
;; false for non-intersection patches.5 A) L3 u {1 \2 K ]6 F7 P
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( u; ?/ }0 k& D1 u;;;;;;;;;;;;;;;;;;;;;;- J5 ~; [" W3 \! Y2 ]
;; Setup Procedures ;;
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;; Initialize the display by giving the global and patch variables initial values.
) E2 D( p$ w5 m1 l5 m. ~;; Create num-cars of turtles if there are enough road patches for one turtle to
& D7 Q8 p D' P. d, P4 |;; be created per road patch. Set up the plots.
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ca
# ~" f( d; V& _7 \ setup-globals8 ]4 n0 _% K% a {
; Z% h' T# R0 T6 ~3 K1 U ;; First we ask the patches to draw themselves and set up a few variables9 d- Z l2 _6 Q
setup-patches
" s- Q6 _9 w7 N# K0 ~9 e make-current one-of intersections
0 c/ `( [* v" i) v label-current4 @5 ~. ~$ ?1 T$ _ x9 j
3 g1 Z- s# ]: o5 d( B set-default-shape turtles "car"
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if (num-cars > count roads)7 Y* y- y! N) Z- r! |1 i
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* U" G* _+ W+ r' ? user-message (word "There are too many cars for the amount of "1 I" [9 x9 n/ X! w; E$ F9 P
"road. Either increase the amount of roads "9 c5 {6 a- {: a* C! C; T
"by increasing the GRID-SIZE-X or "6 P( i, b9 i3 s0 A+ I. D
"GRID-SIZE-Y sliders, or decrease the "
7 j) Y3 f8 S) b8 M4 G7 u0 N2 H# O "number of cars by lowering the NUMBER slider.\n"6 E+ F5 p6 K+ n, N7 R& h
"The setup has stopped."). ?5 Z0 ?- ^7 d
stop
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# S- S: E# ] V- l5 Z; } [ ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
2 h8 h. _0 H E2 L8 _ }. U crt num-cars
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) V& x: {: d: K1 Z! }( ?' y9 P N5 _ setup-cars
6 H& L$ d% L. Q2 _ set-car-color4 [& `0 n% K: V; D( t; D" l, j
record-data1 y& R. p3 x+ F: G% A) I1 g
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;; give the turtles an initial speed+ ^( |7 q( k, L1 t
ask turtles [ set-car-speed ]
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1 Y, l: r; D; A: ?- {, b reset-ticks, Q9 f! @4 k2 N! R
end
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;; Initialize the global variables to appropriate values0 m& c& z1 q7 i
to setup-globals( |( e" w6 r, K* z
set current-light nobody ;; just for now, since there are no lights yet4 [' M6 U; n# U! O" E
set phase 02 E) {$ l/ t. k% v7 L
set num-cars-stopped 0* [% m. M3 ?, |" G0 ?# G$ ]
set grid-x-inc world-width / grid-size-x
2 Z. f3 g, {3 M3 @ set grid-y-inc world-height / grid-size-y- b' Z9 J M6 K I% a
7 D) P* R* }: `( y: f ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary+ C& l! H8 i9 W( D0 Q, v: F
set acceleration 0.099. l3 m5 `9 E, E5 Z# ]( \
end& k9 B6 E+ n" s$ r" p9 `: J
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,# m, s) K: [3 D- r1 S! h
;; and initialize the traffic lights to one setting
* a i1 S; g% _: O7 |/ Ato setup-patches5 U _! w3 e- T/ ^0 p4 Y' o
;; initialize the patch-owned variables and color the patches to a base-color, f1 {( n! b i# {; s
ask patches$ F# {* ?4 L( }2 e# N: N' L
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& r9 l1 [, z% m4 T& w$ C set intersection? false: C( N3 Q6 F# g( ]7 ?4 Z" |
set auto? false8 |1 H' b F; u
set green-light-up? true
: q8 L$ w$ C% I5 k set my-row -1, D+ P( D7 [+ I7 f- R. S1 `3 v2 P
set my-column -11 E( w0 g9 c6 ~* h; e/ a' q
set my-phase -1
* H `( N2 D/ `! o% N( I) H set pcolor brown + 3
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& w3 |3 @+ ?, j! e0 D9 z0 b ;; initialize the global variables that hold patch agentsets
+ W# ^* G' s# a* y7 _( W9 T9 D set roads patches with& I( K7 ^# m, _, X
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
/ Z& ]6 Y4 j7 Q (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
/ C N+ V; c; V1 O0 [9 m2 x1 K3 x set intersections roads with4 J Z- z3 C+ k8 [: b2 M: W
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and9 @2 o9 y- X8 q# {* |4 k4 j+ u- C
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]: y, d' ?6 }! H5 y' k
5 T7 H7 i/ B% F0 b5 B ask roads [ set pcolor white ]7 |+ m% S6 n; v* q
setup-intersections
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- h2 g% l6 @8 |1 _& [其中定义道路的句子,如下所示,是什么意思啊?( a; j7 s, h- R3 q+ s! y9 n
set roads patches with
* D4 P8 n$ u. H! p4 f) K+ S [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
+ @2 | V: V4 {5 g" F9 r" h4 F (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
( b+ C) y, l% q0 v3 S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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