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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。
6 n. I l0 ~) m/ g( l3 D% Enetlogo自带的social science--traffic grid这一例子当中,) H. \/ Z' m" B
globals
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7 N6 Z- R; e3 ]+ X grid-x-inc ;; the amount of patches in between two roads in the x direction
% O! x6 X s- {0 M grid-y-inc ;; the amount of patches in between two roads in the y direction
+ n5 L' K6 L# _6 X acceleration ;; the constant that controls how much a car speeds up or slows down by if G: D3 H& J5 l5 h( B7 H' F
;; it is to accelerate or decelerate
9 H" ]1 U' Z+ e9 ] phase ;; keeps track of the phase
3 t; ?3 B8 \* `4 p6 h" C num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure# Q: K+ @- Y, b. V/ o: V
current-light ;; the currently selected light. b( t0 j# v5 ]: E, J) n
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;; patch agentsets
! u( N- b1 j, n# U& U. V3 a intersections ;; agentset containing the patches that are intersections
$ c3 N) t" u* h6 ? roads ;; agentset containing the patches that are roads
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turtles-own- S0 T- m' r/ A0 P( ~) r
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speed ;; the speed of the turtle. j# E/ q( a O, m9 ` T
up-car? ;; true if the turtle moves downwards and false if it moves to the right4 Y* I+ z6 k+ H' }8 C1 f6 X
wait-time ;; the amount of time since the last time a turtle has moved
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6 a/ B+ `) p I$ g/ l$ \6 Npatches-own2 W, c& G. G0 L1 y/ K/ T
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intersection? ;; true if the patch is at the intersection of two roads- r* I: [+ u! |- [. S2 |0 ~
green-light-up? ;; true if the green light is above the intersection. otherwise, false.9 b% h5 i# J" w' n% r! Z; V. l
;; false for a non-intersection patches.
5 t$ P% \5 j; W& S% L" s my-row ;; the row of the intersection counting from the upper left corner of the
2 p5 K1 `$ _2 b2 M- h ;; world. -1 for non-intersection patches.
3 m, s( d; |* K9 H# t my-column ;; the column of the intersection counting from the upper left corner of the
5 \; A' i7 c/ G; l1 ?7 x9 \ ;; world. -1 for non-intersection patches.& ?5 O0 L( c. h. L* F
my-phase ;; the phase for the intersection. -1 for non-intersection patches.! a2 F9 T9 |8 G2 Z- U
auto? ;; whether or not this intersection will switch automatically.
3 A# e$ d- n/ N, I+ A: n ;; false for non-intersection patches.
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2 g+ j, i8 W7 C0 t. f! C1 D;;;;;;;;;;;;;;;;;;;;;;$ _5 K& O+ \9 v0 M) r6 @3 \5 F: }
;; Setup Procedures ;;3 ]( r2 w, w a1 h. t1 [$ C" H
;;;;;;;;;;;;;;;;;;;;;;% |8 B3 ?3 j/ X1 `9 w. r% B
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;; Initialize the display by giving the global and patch variables initial values.: p! L* z$ Y A
;; Create num-cars of turtles if there are enough road patches for one turtle to6 x; g& w* j7 G6 p) k4 l) w# I3 O
;; be created per road patch. Set up the plots.8 R4 K* K. `5 W; c; @3 }* i" f
to setup, L8 b# R# Y7 ~0 [) H
ca
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;; First we ask the patches to draw themselves and set up a few variables
3 J# _' ~; `& O* R. D setup-patches# E5 e* R. R0 K3 Z
make-current one-of intersections4 d3 i: c2 N" g* R9 j0 B" W
label-current4 Y& {; B4 I6 U) Q
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set-default-shape turtles "car"$ B) P+ |: a6 u" y, y) K8 O: Z
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if (num-cars > count roads)1 B5 n, k" P$ G# i' Y, M" E
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user-message (word "There are too many cars for the amount of "$ ?( H; N2 ^9 e$ T x) W& m
"road. Either increase the amount of roads " I1 q8 v6 l. u# r" L. R( t9 a) y
"by increasing the GRID-SIZE-X or "' f* l7 N/ U- N F4 e
"GRID-SIZE-Y sliders, or decrease the "* G( `+ C$ q, n$ R. e: M
"number of cars by lowering the NUMBER slider.\n"
- p8 F+ j8 s) |& K5 ` "The setup has stopped.")
. Y! f! g4 c& m! k2 Y2 L5 G- x: e stop; j7 f2 ^9 b& Z1 z: m# p
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: r" w- S1 b: R; G# f* `. _$ E! I' G ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color, h$ q& b1 a! x3 t1 N6 y2 z
crt num-cars% w- [7 S4 l3 c6 M% o. [7 d
[
2 g, q. F6 R6 y5 q& M" t+ V setup-cars. n% h+ ~6 \- ?! Z& w
set-car-color- T* T/ J4 k# z
record-data; x# n0 a0 j! U! \( s
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P3 s1 y- [! k7 j- D ;; give the turtles an initial speed: [4 w; T% Q. b2 ^! D
ask turtles [ set-car-speed ]' z; u3 @- B8 |. Y
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reset-ticks
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;; Initialize the global variables to appropriate values& w3 X) j; @$ W, N
to setup-globals
" h7 ]7 P/ @' k7 q+ D% q set current-light nobody ;; just for now, since there are no lights yet
6 ^" Y D& \( \: B5 W" h set phase 04 O6 |, ]0 s' P
set num-cars-stopped 0
& {3 z( F M; Q/ g6 Z+ p/ X5 r0 s set grid-x-inc world-width / grid-size-x
% B0 V' Y& {4 |/ H0 ^2 s set grid-y-inc world-height / grid-size-y2 C9 c) z# s3 Y [# H; E
, \* e* y. U+ {0 @7 V5 v6 c ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary' ~7 [) a: k+ t% q0 f) e8 Z
set acceleration 0.099: F" h" S x1 k
end1 X: Z p/ L6 D( F3 `
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
$ I( p! m7 \8 b;; and initialize the traffic lights to one setting/ p9 x# Q0 \/ O" k
to setup-patches. G. x! U O" V# A) K
;; initialize the patch-owned variables and color the patches to a base-color- C% I/ z, ?$ P% W0 l0 \
ask patches
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+ i: u0 @' l, L' `7 r% \) ?% G: ] set intersection? false
5 k3 C ~. N$ u$ t+ K6 W set auto? false* m; h+ d6 B4 F: G9 i, k+ H
set green-light-up? true7 A" D4 C, t1 o
set my-row -1( |3 X( M" L. @& b
set my-column -1; f4 v& m, Z% s
set my-phase -1
# r7 ~( ^ n! \5 a- R; b set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets- W8 i" l4 m2 ^# F5 y. t, q$ I Z' ~
set roads patches with
V; f' }* _8 @: M [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or1 Y$ A' G& G/ c# \1 J4 \4 t; a1 V* L3 C
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
0 Z! ]: T+ p) c2 O7 z$ B( N# } set intersections roads with+ `2 } y1 v1 N2 l+ X7 Q
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
0 N6 w% W" _4 M# K: r (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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a5 \+ L# B/ w6 S/ y' L3 o ask roads [ set pcolor white ]/ K! n6 A0 z- t' @
setup-intersections" p% J- o1 e- F4 @5 r3 D8 n' f
end
' @. J4 S* o0 q/ w$ Y: n其中定义道路的句子,如下所示,是什么意思啊?$ W6 j" U( M7 `5 V
set roads patches with. e' t' k: g' d! P9 t/ ]
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or: I" n# [6 F' k
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
+ Q. V J3 Q; N7 h. A5 Y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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