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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。! A3 A$ D9 |2 y7 m' }! w+ C8 Q
netlogo自带的social science--traffic grid这一例子当中," r8 Q$ \, b3 R8 Y8 W
globals
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f$ O4 O% U! A: l8 o. P7 P, i7 R grid-x-inc ;; the amount of patches in between two roads in the x direction
, k, Y$ v0 q2 T3 B6 W, F6 a grid-y-inc ;; the amount of patches in between two roads in the y direction) t/ a3 {7 v" r3 h( e4 g
acceleration ;; the constant that controls how much a car speeds up or slows down by if6 g6 {& }+ [$ U7 t6 h& v
;; it is to accelerate or decelerate$ ~6 j5 f2 B* U! k- o0 v- h; X
phase ;; keeps track of the phase
5 s- R& g! x/ T num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
" p$ Z% Q2 i; f: @ current-light ;; the currently selected light' C0 _ F/ O; H |; E, X9 u( k
% o" e& s9 q; Z9 E ;; patch agentsets5 m# r) v" s. k9 V% S1 Z: P
intersections ;; agentset containing the patches that are intersections
! ~7 E M- B3 A. g% Y/ r roads ;; agentset containing the patches that are roads
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; j/ K$ q1 \2 p9 o6 p5 Jturtles-own8 P2 |7 J2 H: T: h) y+ \* x
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speed ;; the speed of the turtle3 D- ^- N0 i4 x
up-car? ;; true if the turtle moves downwards and false if it moves to the right
# [* V; A' _2 h0 {" H3 R wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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* D# t, M+ Q6 f! l$ @" a intersection? ;; true if the patch is at the intersection of two roads
+ X. A+ m( b3 I( a3 }. I: j C green-light-up? ;; true if the green light is above the intersection. otherwise, false.$ |0 C& K( p8 X1 |
;; false for a non-intersection patches.
! v) |. H9 _0 p/ {$ S my-row ;; the row of the intersection counting from the upper left corner of the
$ m+ b6 R' U5 f ;; world. -1 for non-intersection patches.: _8 J1 C* [, [/ i1 V
my-column ;; the column of the intersection counting from the upper left corner of the8 Q: ~* v x6 `7 g& M
;; world. -1 for non-intersection patches.
9 `3 d5 V% S) y, F" r* N8 P1 f my-phase ;; the phase for the intersection. -1 for non-intersection patches.
3 L) Q# g% Q( c: Q8 f& N- e auto? ;; whether or not this intersection will switch automatically.
7 \; y" C% G5 F, ~: X7 t& L ;; false for non-intersection patches. d9 h+ E7 \2 C6 o$ r
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;;;;;;;;;;;;;;;;;;;;;;8 W5 h' ?& D/ K. V6 z! R( B
;; Setup Procedures ;;
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( h, T" B1 @2 m, |1 Q6 f# e( M9 h;; Initialize the display by giving the global and patch variables initial values.. O; R& R: F* F$ a( M7 O3 f+ S+ c
;; Create num-cars of turtles if there are enough road patches for one turtle to
: c0 q* r8 r% {7 `2 ^, q;; be created per road patch. Set up the plots.8 E1 _. v q5 v- L& D8 g
to setup* D) x4 o; I) E( b
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setup-globals
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, J% C& d9 R) L1 T! j( N1 _$ c' ~ ;; First we ask the patches to draw themselves and set up a few variables; B/ s8 ]3 |9 n5 o: @
setup-patches9 u0 g. ]5 e- Z8 K
make-current one-of intersections
8 ~; R7 s) F" r7 a r# ?/ ^ label-current# B- V/ ~4 s6 ?
6 H9 \$ y% s& x- L set-default-shape turtles "car": g7 L6 u3 D' z* j
* ?9 n8 V4 j2 c if (num-cars > count roads)
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: t; J1 H! T, I- q5 _' D. Y user-message (word "There are too many cars for the amount of "% O+ w, g5 f) D
"road. Either increase the amount of roads "
6 p0 W/ ^! }( j7 Y/ Y "by increasing the GRID-SIZE-X or "2 O5 }: C0 }8 I7 } }/ p$ D o
"GRID-SIZE-Y sliders, or decrease the "
3 L+ |% d5 V$ B "number of cars by lowering the NUMBER slider.\n"4 _# u8 E, |8 X$ [) `1 K% I
"The setup has stopped.")
7 h# e: }8 H m stop% E) s1 Y1 F0 ?; q3 q
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; p& p! G0 r; [ s6 H5 t* U ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
5 X' | [7 h; Q. U crt num-cars
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setup-cars6 R- I6 b/ ?" G8 t- K4 m# F0 I1 z
set-car-color2 q+ g+ `0 l$ [2 V+ M
record-data
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;; give the turtles an initial speed
: ]/ r$ R* j$ h4 P$ C$ o0 M+ c ask turtles [ set-car-speed ]2 t$ p7 t+ H& K% i0 {" f
5 U1 p0 I1 a2 {' C& @0 G4 W, {- U reset-ticks! w4 }* A- d( y$ A* l
end
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;; Initialize the global variables to appropriate values
! M$ J$ P5 X: y v. Jto setup-globals
! Z: ^) J6 [! Z3 U. r! V8 h set current-light nobody ;; just for now, since there are no lights yet$ o4 I( a* A- o" W
set phase 09 y, Z& J. [. ]" v# a1 H+ L
set num-cars-stopped 0
/ B; Q0 ]" M4 e$ I: Z& T) j6 x" O5 Q set grid-x-inc world-width / grid-size-x
S h- y' k) C* w% B set grid-y-inc world-height / grid-size-y; T7 ~9 H1 [$ h
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
8 m5 i, H* P( W/ k& g2 r3 J F set acceleration 0.099% u: e _. ^2 s2 k. j
end
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% c& `" P( M9 ?. L$ ]$ h" S9 O/ g;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
' }4 h6 {& A$ e1 l+ {;; and initialize the traffic lights to one setting+ {0 N% Z; r4 y3 ]! T+ }& s; @3 U g
to setup-patches5 I- b% g2 _5 v6 r/ @( ]9 ?& e
;; initialize the patch-owned variables and color the patches to a base-color
Q8 f6 r+ g5 [+ _ ask patches# @. C5 n# X7 w* {! s
[
+ H& B; M0 z7 b9 b' h set intersection? false# \7 }) l* ]+ U+ v' Y
set auto? false# M! d6 S, U i! w/ l; {
set green-light-up? true0 T; C2 {: {1 w! [
set my-row -1
" m' z/ I7 H# W6 H5 Y4 o set my-column -11 ]7 F" D+ O3 o ], T5 `" O
set my-phase -1
0 ?# k( f' n' f# [ set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets( y4 X, `4 x/ j
set roads patches with% n6 u. `% W- }
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or2 l/ B3 m3 f f& C, }" D
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
, a/ Q, l/ B4 V0 L8 H/ T set intersections roads with6 R5 z/ c. P: V% F z
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
2 P. F, |% s- }- c: o' g: F$ s (floor((pycor + max-pycor) mod grid-y-inc) = 0)]! ]; P' h. p& }" T' S
. R7 I4 R4 B& f7 O, ]) K ask roads [ set pcolor white ]
4 J5 m' {' H. M+ t. b setup-intersections
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4 S6 r; Q5 ?: l: k! V4 g7 T其中定义道路的句子,如下所示,是什么意思啊?3 W+ h b) a- ?! K
set roads patches with
! j# ^2 W1 V8 l [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
! {# f0 v" |) p9 F& W# E" L: Q (floor((pycor + max-pycor) mod grid-y-inc) = 0)]+ c4 F, c1 G1 K5 ~( w. f. C* _& Z
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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