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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。
# E4 X. L6 O( R- c/ o$ enetlogo自带的social science--traffic grid这一例子当中,+ V2 _7 H0 K) B. X
globals
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! N; |5 l, Z. j. s+ h. [ grid-x-inc ;; the amount of patches in between two roads in the x direction# N; R- i, i j: n( }3 @% Y' k9 w
grid-y-inc ;; the amount of patches in between two roads in the y direction+ `( F( n' r5 ~( i7 C) T
acceleration ;; the constant that controls how much a car speeds up or slows down by if8 p |: [8 v; W' f+ v# E
;; it is to accelerate or decelerate
6 J, S1 j/ K: L: {9 y) T6 A phase ;; keeps track of the phase$ B2 B0 S& p6 {% X) O
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
4 q$ \. J) J x$ @ current-light ;; the currently selected light
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;; patch agentsets
0 u# s) I Z3 l* e v5 g# f intersections ;; agentset containing the patches that are intersections
7 S( r/ |- U9 G, }5 m) T8 K# j: W roads ;; agentset containing the patches that are roads ]: B$ n9 T5 Y: W
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* W, |$ F3 T+ A P. y+ M- H% t# g# W& O7 hturtles-own. Z* @; e: J! v/ H* t7 T8 m
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speed ;; the speed of the turtle
2 _, `! x% F+ L; ?$ Q up-car? ;; true if the turtle moves downwards and false if it moves to the right7 f4 M. v( C H
wait-time ;; the amount of time since the last time a turtle has moved
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- _8 w5 l" R: o3 upatches-own4 s1 S; z, r, a; ]# b. a
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intersection? ;; true if the patch is at the intersection of two roads
9 i& o8 v7 e6 {) D( n green-light-up? ;; true if the green light is above the intersection. otherwise, false." h; a; x, U8 e) ]6 `0 l* Y* y
;; false for a non-intersection patches.
# z/ M; X: D) I$ f my-row ;; the row of the intersection counting from the upper left corner of the1 N4 f, a/ n3 j$ L8 A9 ?
;; world. -1 for non-intersection patches.6 V1 y1 i3 U, }3 X5 E# F+ A% s) _& C
my-column ;; the column of the intersection counting from the upper left corner of the$ p( m' N" i) Y0 i7 Q
;; world. -1 for non-intersection patches.
. Q! x% G0 ^; k" E1 F$ l3 O) V0 [ my-phase ;; the phase for the intersection. -1 for non-intersection patches.
6 t7 \3 t1 I/ F! y auto? ;; whether or not this intersection will switch automatically.
/ B8 I1 x: ?3 N5 G7 e, o: N4 e ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
5 q P, r0 j8 o+ o/ T. s, {;; Setup Procedures ;;# t, v% v3 Q1 w1 {. [. h
;;;;;;;;;;;;;;;;;;;;;;4 N: D/ p/ L$ h' U* n
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;; Initialize the display by giving the global and patch variables initial values.6 p6 a; x J, j5 G1 \; Z
;; Create num-cars of turtles if there are enough road patches for one turtle to& c* A% H% |3 c+ N6 X7 ^% @
;; be created per road patch. Set up the plots.7 V& k0 Q0 z' X0 X6 L1 I& Y
to setup
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% x: d0 O1 f# K9 ]" c3 N8 L h5 m: t9 K% F setup-globals( L; y# \# {6 \6 D
: F; A& `/ l4 U2 h/ {8 W ;; First we ask the patches to draw themselves and set up a few variables
; \: M7 l9 p* k: Z: ?1 B setup-patches( L' C5 [ w# ~& `
make-current one-of intersections
0 ]/ v! R+ c) U label-current" D8 `( i, r/ l: P$ J2 ~
1 t4 \: F3 }( B8 r. L1 V set-default-shape turtles "car"- Z/ |6 C" z' y {1 n
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if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "7 j f2 n" \$ b
"road. Either increase the amount of roads "( a* L. h: V% m# z- ]% G- f
"by increasing the GRID-SIZE-X or "
6 l) K {- P, x "GRID-SIZE-Y sliders, or decrease the "
l6 Q" P; L' ~& P" { "number of cars by lowering the NUMBER slider.\n"7 H- z$ y. Y+ t
"The setup has stopped.")" V+ \ k2 L" c! B( ?
stop, H4 K( d) K; Z! X) t" B
]
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color y7 Q& v; z- D: }
crt num-cars8 D1 {5 `/ i5 v7 e8 ?6 {1 n* h* Q
[
) ?9 M4 f3 C2 x7 K8 F2 s2 W& v setup-cars
" R/ c4 n6 |5 q3 \" G set-car-color5 {3 z7 b$ C* ]
record-data
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& G+ O9 j% n; d+ K; l% ] ;; give the turtles an initial speed
7 `" N) o; D; T' u9 [ ask turtles [ set-car-speed ]
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4 G( |3 d$ ]* \. | reset-ticks
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;; Initialize the global variables to appropriate values) Y( q& m1 ^6 d$ {
to setup-globals
# A9 {) f; O* x/ I' B# Y- W$ g set current-light nobody ;; just for now, since there are no lights yet( g- H( p. N% y! h4 T+ K, k
set phase 0
5 q* d! Q9 l/ c% z, x+ a& X set num-cars-stopped 0- h3 R* e0 U+ g% S2 u0 B
set grid-x-inc world-width / grid-size-x: ^- U+ z+ [: Q5 U% [9 C" U& _6 t
set grid-y-inc world-height / grid-size-y
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% g5 y0 r R$ {9 N i! ~8 D$ W" R ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
; y' j& m7 k+ x2 x# e$ t set acceleration 0.099- i. E5 ~0 C. D% z& E0 [
end
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U) R0 q6 s0 I% b;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
: V3 e$ p# D6 i, h4 [8 i+ H;; and initialize the traffic lights to one setting f' f* m- H. K+ m* _
to setup-patches
, b, [/ T) |% I ;; initialize the patch-owned variables and color the patches to a base-color8 Y% _7 S" z! P+ m
ask patches
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set intersection? false/ e o! p' [8 |2 |& X' h* c
set auto? false
6 w: F8 H1 g3 m9 p6 S set green-light-up? true4 }3 n6 {, w: k% b+ O+ f
set my-row -1- M+ @! P5 v8 X7 Z2 p3 W
set my-column -1
" l9 W" h2 U( M set my-phase -1* l* b5 ]7 `& l" n, B& V( f& j$ p8 e$ Q
set pcolor brown + 3/ s8 p$ p4 D+ C b5 I2 V
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;; initialize the global variables that hold patch agentsets1 } q( s9 M- y
set roads patches with
0 p8 ~ h6 Y# e1 l. X$ y [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
9 Z7 c& G3 X# H$ K (floor((pycor + max-pycor) mod grid-y-inc) = 0)]" B# e1 j3 h' o0 f' z9 u0 R
set intersections roads with P m% a, }2 K9 `) v
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
# u$ n" b' o. Z, u) \3 g (floor((pycor + max-pycor) mod grid-y-inc) = 0)]+ [& s. l# d: K. A2 x; |( L6 F
, X: y5 `+ i" l0 D ask roads [ set pcolor white ]6 E8 i9 R/ P% ]; X* j# d' M
setup-intersections+ n/ q# |3 G L9 ~7 T# s* x$ E
end' E9 a5 I5 E; y7 u
其中定义道路的句子,如下所示,是什么意思啊?9 S6 q6 x6 \1 R# H% r' A
set roads patches with- F/ c U' L% j
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or) D( h+ x7 B+ N5 d9 F. J
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]; h) z: b" M% u0 |" H+ P
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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