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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。
q% y5 e% `8 Y9 ?4 W% |9 Vnetlogo自带的social science--traffic grid这一例子当中,
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grid-x-inc ;; the amount of patches in between two roads in the x direction6 |4 ?6 x7 F6 K5 G& C
grid-y-inc ;; the amount of patches in between two roads in the y direction9 ?3 H1 L. P5 P; ]5 S0 O. m% Q @
acceleration ;; the constant that controls how much a car speeds up or slows down by if
( |- l0 C0 y4 P8 E; j ;; it is to accelerate or decelerate, o6 D' x/ Z& A! M
phase ;; keeps track of the phase
* J$ U. F: F1 M6 @1 K num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
" W6 w$ [' o# n' ^; ]! Z current-light ;; the currently selected light
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7 Q+ T3 d7 I( C ;; patch agentsets
5 E# e# b; @5 k5 X u+ A7 b, ` intersections ;; agentset containing the patches that are intersections
0 x* Q4 U7 n+ d2 o5 \0 F3 i roads ;; agentset containing the patches that are roads
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/ `: p: _, W* v* H5 X+ C8 f0 T; `0 r8 kturtles-own
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9 Q; j$ J: J8 b* ~0 @' X speed ;; the speed of the turtle
4 }1 W& ^1 ]" S% ]. D9 `" ^ up-car? ;; true if the turtle moves downwards and false if it moves to the right
. h: |' s, j; l2 q wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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: r. [- a, Y* S( p) z intersection? ;; true if the patch is at the intersection of two roads
2 ^5 y% H, T: _( n0 g! J green-light-up? ;; true if the green light is above the intersection. otherwise, false.
3 Y; o. l# U9 X8 R4 P ;; false for a non-intersection patches.
6 ]" N2 a% ?5 g4 r( c my-row ;; the row of the intersection counting from the upper left corner of the
0 w6 Q: d& |4 M; X/ ~% h& D ;; world. -1 for non-intersection patches.# [, ^& ?/ t+ T
my-column ;; the column of the intersection counting from the upper left corner of the3 Y+ Z; U2 |8 N2 Z3 f! \
;; world. -1 for non-intersection patches.
0 Y( A. P6 {9 w& c3 A0 L my-phase ;; the phase for the intersection. -1 for non-intersection patches.
1 }* V0 N% ]3 Y; y# Y auto? ;; whether or not this intersection will switch automatically./ x7 e% S- y0 B
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;, _1 k" W5 K3 _8 l4 |
;; Setup Procedures ;;
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8 a. {8 |& Z5 B5 \4 }) W( U;; Initialize the display by giving the global and patch variables initial values.
5 `5 F6 `1 Z& O# J; L3 N: x# r;; Create num-cars of turtles if there are enough road patches for one turtle to) r6 n1 S# c9 t$ {
;; be created per road patch. Set up the plots.4 I& J- Q7 g0 f1 t
to setup9 \& Y3 `4 ~9 z+ n1 }2 r
ca
7 R8 s" v. G9 J) t, K& _ setup-globals
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0 L% q4 U2 c5 |# j6 k. ^ ;; First we ask the patches to draw themselves and set up a few variables
- G4 t+ G% V, m' H3 y setup-patches$ i( J/ O+ b- j0 ]6 ?4 ?
make-current one-of intersections( O/ e$ |' c6 N- E0 x( V2 H
label-current
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% Z8 c1 k5 q6 O set-default-shape turtles "car"* l0 o) {/ M* |
" G( u7 l, a' s% S4 G if (num-cars > count roads)
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- [6 C2 h0 [% Y# C: N; j U/ s user-message (word "There are too many cars for the amount of "# W! @8 B8 C, j. X' G
"road. Either increase the amount of roads "2 y# K) B* g5 C
"by increasing the GRID-SIZE-X or "
2 L5 O9 l) o8 U "GRID-SIZE-Y sliders, or decrease the "
$ ]( E Z6 ?; p1 h, N5 e' H "number of cars by lowering the NUMBER slider.\n"
; o% C! ?& M8 S5 w% S, M "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/ Z4 g' Y7 i( u8 v% u( z
crt num-cars/ e1 f; P" y2 J5 v# b0 h5 ^
[
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; I5 e4 R1 k% m) c, w set-car-color( ]- u/ i5 D- R2 M- }+ J3 B
record-data) A' Y0 d. _& l+ q: W$ i5 N! V
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& B. M" @" c, l. [8 ?7 c ;; give the turtles an initial speed; k8 X2 ?$ A Y, ^5 |8 q
ask turtles [ set-car-speed ]
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reset-ticks
# y7 n8 y5 p# e: [0 Oend
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% K* f% f0 l. q% k3 x;; Initialize the global variables to appropriate values
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h. L/ |$ l8 ^3 g* F set current-light nobody ;; just for now, since there are no lights yet! x3 Z' ]. B- H$ K- {; C. e2 Y
set phase 0
1 r5 n; A/ F1 u6 I0 K0 T$ A) B set num-cars-stopped 0: h% O- X4 ]- w. x& v
set grid-x-inc world-width / grid-size-x$ k1 |) X N/ _% h" w
set grid-y-inc world-height / grid-size-y
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary/ z; N* u0 N% a v
set acceleration 0.099" ~3 L6 y6 }, V; \ b6 F
end' G8 y' t4 O! w6 ?$ d0 E
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
; ~( Y4 R. j- H5 U) S;; and initialize the traffic lights to one setting) D- ~1 r! V+ o; g; {
to setup-patches7 |6 y3 U9 ]2 O* g3 I
;; initialize the patch-owned variables and color the patches to a base-color& g6 [% z+ o2 J0 f' |
ask patches
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set intersection? false
1 Z) t. Y0 r I3 T set auto? false2 e. h/ z Y) g. \4 n
set green-light-up? true9 m6 ?. S* _, u1 H$ z6 ?
set my-row -1! f* @( `, z5 q6 T) c0 f, e
set my-column -1
1 e# {5 G3 s+ J$ s set my-phase -1
0 e" ^9 |9 E: i" S2 j0 ~ set pcolor brown + 3
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" w2 i9 F- c0 I- p# t ;; initialize the global variables that hold patch agentsets$ B$ G9 H# T& `2 v/ A2 [3 a
set roads patches with
; e# I/ ^6 Z: G7 p$ _: v* {' G [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or9 L1 D& ~# j( Z- v: g" y& x2 t
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
2 s8 z& ^7 U7 ~+ k: q5 K set intersections roads with- ?* m% ]: @0 F7 C' |0 f
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and" i8 ]. ~1 Q8 w& e$ q/ }* g! Q$ H
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]1 r9 A$ ~5 r5 k
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ask roads [ set pcolor white ]
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end0 Q" z+ z' Q% f% U
其中定义道路的句子,如下所示,是什么意思啊?
) h% t6 \3 I5 J5 }6 z3 C3 Z- i$ ` set roads patches with2 ^! e% ~8 G5 ~$ w" {6 P
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
$ p+ }% h. x/ K, @* d$ d' t) L (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
" i/ t% y% |. j, R: l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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