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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。
7 L) Y" h, t0 Q9 {. Unetlogo自带的social science--traffic grid这一例子当中,
9 S/ A3 E: w5 |2 t5 Z) L- qglobals
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grid-x-inc ;; the amount of patches in between two roads in the x direction; l, k0 m3 [0 d
grid-y-inc ;; the amount of patches in between two roads in the y direction; V' R' c4 F K9 q! {. K/ O6 Z
acceleration ;; the constant that controls how much a car speeds up or slows down by if9 {* q" `) E9 P4 l! ^* t9 E4 V& p
;; it is to accelerate or decelerate! ^/ L3 r, v# Z
phase ;; keeps track of the phase& X* @1 I7 h( y* [
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
6 Z5 F7 c; W8 i( Q current-light ;; the currently selected light
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;; patch agentsets3 h' i/ r, a3 C9 {. _
intersections ;; agentset containing the patches that are intersections
8 \! O- d0 g, S0 S, O roads ;; agentset containing the patches that are roads, F( ]$ R# J# O [, ~
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7 R7 D" O) W( j+ ^- p5 Mturtles-own
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; z. y4 o! |7 [( I0 d$ y Q speed ;; the speed of the turtle/ a+ q. U* z5 ]: ~" p/ D m# n+ s
up-car? ;; true if the turtle moves downwards and false if it moves to the right
' E- Z p" A& y* F H6 M3 m wait-time ;; the amount of time since the last time a turtle has moved
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5 ]) O' o$ ~- npatches-own
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intersection? ;; true if the patch is at the intersection of two roads
3 x3 F. c6 N( j- F& A2 h0 P& K7 H2 t# q green-light-up? ;; true if the green light is above the intersection. otherwise, false.
9 @/ o4 {! j1 C$ A ;; false for a non-intersection patches.
( F+ _( F4 ]2 q- u# b* K4 H/ X my-row ;; the row of the intersection counting from the upper left corner of the; Y% j- r" A9 A9 T
;; world. -1 for non-intersection patches.
: E1 u% f2 Z0 W% a" B my-column ;; the column of the intersection counting from the upper left corner of the9 Y/ E# r. n4 O5 O' U
;; world. -1 for non-intersection patches.) ~7 G. D$ I$ x7 R
my-phase ;; the phase for the intersection. -1 for non-intersection patches.0 f1 w( p! `( q, n9 q
auto? ;; whether or not this intersection will switch automatically.! y. P' q( U, U8 t' M
;; false for non-intersection patches.% `1 y2 l# V5 D8 Q
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6 B5 h5 X% J& h5 I8 @0 t$ Q;;;;;;;;;;;;;;;;;;;;;;2 e5 ?9 K+ U0 r( ]; U. B' E: B, R
;; Setup Procedures ;;
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' V4 a- l! U# K8 P;; Initialize the display by giving the global and patch variables initial values., ~) W" U/ m3 ?! a6 v+ p9 }& x7 Z
;; Create num-cars of turtles if there are enough road patches for one turtle to$ z. L4 ?0 T/ B" } }6 m- U4 L
;; be created per road patch. Set up the plots., {1 u, _9 E& Q, P/ d
to setup/ Z: S# }. O# g: e' _ ?
ca
' S* C8 S3 A% A7 [& I! ~# K setup-globals, ~2 q( b7 n% G# X/ X& w3 ~5 \
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;; First we ask the patches to draw themselves and set up a few variables
6 l% s7 j8 ~# A$ p1 j" [* g% B setup-patches
4 U1 u; w1 f) h `: ]2 c5 @8 E make-current one-of intersections
; B h% j+ V) |5 ?. c label-current
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?/ _% g$ V$ I/ n" H set-default-shape turtles "car"0 ?7 }$ p* d' v* m3 J9 @; S
: d) ?. w7 e* g- F if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
' H- f1 c" p6 t! { "road. Either increase the amount of roads "& A% @9 d% N+ u
"by increasing the GRID-SIZE-X or ") [3 V+ X3 |+ _9 R, Z5 n* l& E
"GRID-SIZE-Y sliders, or decrease the "6 W6 M0 n9 d" g3 M
"number of cars by lowering the NUMBER slider.\n"
$ d* v+ Q& w; K' J! f, \+ U "The setup has stopped.")
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
2 @) L6 A- t5 g) T crt num-cars ?/ q4 F7 ^8 t1 t
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setup-cars
+ t6 f" W8 t& \/ Q: W0 \ set-car-color
! J6 t5 G( W# V0 J record-data
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;; give the turtles an initial speed9 _9 T b1 {4 j" f% x
ask turtles [ set-car-speed ]$ A! W! h( i, H5 V3 ^( W/ G
% {: ^2 I, k3 W8 O4 ^8 e reset-ticks' C- w3 f& [& Y, G k% _
end
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;; Initialize the global variables to appropriate values
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3 ?) A, `/ f% b1 |; v1 N) b7 f set current-light nobody ;; just for now, since there are no lights yet
& H4 T4 Y' }, b set phase 0
: Y/ H: k$ k$ I8 s3 j set num-cars-stopped 0
/ R3 b1 i! S+ W ~$ z, c0 G! l1 h set grid-x-inc world-width / grid-size-x
" |( Z+ Z6 a- z/ y3 Q set grid-y-inc world-height / grid-size-y; P- }# R" h( c# B T( i
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary7 d' j' P0 t9 `/ c* M
set acceleration 0.0997 [3 |* L0 L0 G3 R& n; O9 X, P
end: }- I* a$ m5 {' n6 x
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,. q6 J, ~/ @/ f$ T% w, I
;; and initialize the traffic lights to one setting: |6 q) f* i( M
to setup-patches1 M: ~0 [! J, l6 Z
;; initialize the patch-owned variables and color the patches to a base-color
' z0 p/ i1 i6 {' b7 j ask patches( ]. D$ z" E+ ^! m$ R
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set intersection? false6 k7 j) S- N( Y& n# }
set auto? false
' j' R- Q2 X1 ^: H2 n4 g set green-light-up? true
6 q$ h8 Z2 D& ^- g2 {1 X( B set my-row -19 w- M$ ^: K$ Y/ T) O. @; l
set my-column -1( l p# ^7 i* |! ~2 \3 \) x
set my-phase -1
! F: r) K5 Z7 l; g' y0 J set pcolor brown + 3* c5 z3 E2 N3 ^& L, i
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. Q# [) {4 y7 d; j ;; initialize the global variables that hold patch agentsets0 K# H; u/ u# l: H) E% `" H- E- {
set roads patches with
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(floor((pycor + max-pycor) mod grid-y-inc) = 0)]5 x- q, N0 ~; H# Y7 d9 v1 {
set intersections roads with) M% A- P* ~, J1 L* x$ r/ b
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and/ P* K+ c4 O Z9 D9 H' D
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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4 ?$ R5 s* T3 N! E- L ask roads [ set pcolor white ]0 ]% u8 S6 ~0 O9 g
setup-intersections+ s; p% P B% T" c5 d" b2 H- {( B
end
1 w% S1 `3 Y [, \' X其中定义道路的句子,如下所示,是什么意思啊?
/ L( w2 k/ o9 `7 U, Z) V' K. S* c set roads patches with/ B2 q: x* ~0 b& l$ M
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or8 P N9 X0 L$ ?
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
$ h" E: p8 R0 u6 a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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