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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。' m0 i$ D w+ M4 i1 {+ [
netlogo自带的social science--traffic grid这一例子当中,* `$ @4 L* O7 B
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction. s g+ F9 T1 W$ w K; K9 n6 c8 ]
grid-y-inc ;; the amount of patches in between two roads in the y direction
) |8 V t- K" p5 O- g' r acceleration ;; the constant that controls how much a car speeds up or slows down by if4 s4 [0 S% }/ z) r# S* u4 E
;; it is to accelerate or decelerate8 K$ v4 p( I/ u- [' M2 C3 @$ A
phase ;; keeps track of the phase
0 F3 g2 ^: ]4 h( h- ^ num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
% o! a' x6 Q8 F/ a- {+ ^: R current-light ;; the currently selected light* O) M+ L$ D0 [
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;; patch agentsets% U3 u. p; G: w# ~- M8 a* Y
intersections ;; agentset containing the patches that are intersections# x' `7 v. L9 h3 ^" l
roads ;; agentset containing the patches that are roads0 v' E/ z+ u" ]$ `/ m; G
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% _) s' X" b/ S* K& w% mturtles-own) }5 [) c1 z. X- v
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speed ;; the speed of the turtle
3 Q; `# R H+ s1 a9 C0 B) `0 Z up-car? ;; true if the turtle moves downwards and false if it moves to the right
0 ]3 D" D1 B* N wait-time ;; the amount of time since the last time a turtle has moved4 N" I& e, h+ r/ @
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5 o9 T# Q. I& Vpatches-own! X+ p' C0 W" `9 e
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intersection? ;; true if the patch is at the intersection of two roads
4 e1 ?% D6 s, r( h3 k9 F2 \ green-light-up? ;; true if the green light is above the intersection. otherwise, false.
! N' a% m x7 P( b/ O# G ;; false for a non-intersection patches.
# N6 y6 y& ] ]( I" Z- a my-row ;; the row of the intersection counting from the upper left corner of the
$ x8 h; {, @) O, _ ;; world. -1 for non-intersection patches.+ c5 ]: o; V; J
my-column ;; the column of the intersection counting from the upper left corner of the( u1 P. m, j/ p8 m* ?+ M& H) a6 z: w
;; world. -1 for non-intersection patches.: _4 E0 [! m( E( @/ B* b4 k
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
$ N5 m5 V) N, c; c# e+ C auto? ;; whether or not this intersection will switch automatically.- _! D" N" _8 x0 `3 [$ Z& \
;; false for non-intersection patches.
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3 S% U/ Y7 |% C! P8 o;;;;;;;;;;;;;;;;;;;;;;
5 {* t2 o% |- @3 o) {;; Setup Procedures ;;
2 d! R3 f a6 I. T7 D p7 k;;;;;;;;;;;;;;;;;;;;;;+ n5 N, E0 ~- u( B- v* R5 b, i
+ X9 A; ^3 ?4 `( V1 i8 L2 o;; Initialize the display by giving the global and patch variables initial values.7 X$ n% w) Y) I: p7 d3 p+ V
;; Create num-cars of turtles if there are enough road patches for one turtle to
3 a+ H! @) n; D; K2 A( B;; be created per road patch. Set up the plots." U1 G) D. M: Q+ m) _7 T
to setup. k4 ~% k. P5 o
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setup-globals7 q0 @% ~# ~: d6 ]7 f
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;; First we ask the patches to draw themselves and set up a few variables
' p/ I4 Q: m$ b) A& a setup-patches* P1 R; j0 n/ ?) w7 `$ {; z! o
make-current one-of intersections8 s% B7 o, M( f6 z5 e2 y) D
label-current+ G( d( a' R% f
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set-default-shape turtles "car"
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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 C; _9 v3 f' l+ M( X% D, V1 a "road. Either increase the amount of roads "
. H0 V6 c/ J* E6 u "by increasing the GRID-SIZE-X or "* z/ e. v- V& O5 `( t6 S
"GRID-SIZE-Y sliders, or decrease the "
1 e) ?, q) Q2 C "number of cars by lowering the NUMBER slider.\n"
3 \+ N% _7 k# I# [% {9 u, f "The setup has stopped.")
2 e) a, c7 t g$ p/ e' B# D stop
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( Z, ^; `, T0 `. P# A ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
- a' I: W! L9 p, g' V crt num-cars
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7 r @0 s, F9 N1 v( l- b2 e' | setup-cars
1 b- O' F; G/ A2 B" t+ |' m+ H set-car-color
& Z9 X" V" l! X7 ?$ ^! S record-data
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;; give the turtles an initial speed% D' x: j3 O- ?; |8 Y
ask turtles [ set-car-speed ]6 A0 b1 T6 D9 c W
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reset-ticks2 o0 j& D, t* E" ], P
end; g9 o; \3 O, f! Y' Q$ N
" Q" c4 j, t" }4 _6 Y;; Initialize the global variables to appropriate values5 |& ^% _$ K0 _, C7 Z
to setup-globals8 ]1 |/ |( ]9 l- t+ `3 |8 c
set current-light nobody ;; just for now, since there are no lights yet7 R4 F4 N, o _
set phase 0, B' k% w f! n: ^5 P
set num-cars-stopped 0. A: R/ c, L3 I* r9 ~, h
set grid-x-inc world-width / grid-size-x
- _8 ^0 d1 l' a. u" F* i, q& ?/ |1 S 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/ I1 }- K1 x- B0 {
set acceleration 0.099
% H: c5 R! t5 {6 Y! mend+ Q' A3 L# o6 `' h& n
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
9 M( l1 c+ k& Q) T8 |;; and initialize the traffic lights to one setting
* ]- ~- C) U5 r* O; p; sto setup-patches& [1 ?8 a" R& ~% f: J, X
;; initialize the patch-owned variables and color the patches to a base-color& s) l* l7 A" k$ d$ r
ask patches" D% h) e, |6 `' C \
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$ Y4 h5 b% a9 N set intersection? false& |6 S6 k9 L P d
set auto? false
6 h" c) B5 T6 E2 }* Z set green-light-up? true
' ^2 K8 H) m6 g; G) s2 K( ? set my-row -1
( a) G* Y$ @! j. j+ _; H" t set my-column -14 u; D; U1 E* U! b& A8 _! b
set my-phase -17 F% a! w% p1 V+ U& |" B
set pcolor brown + 3( O) g2 J: h/ @% s5 S) U( p' l
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;; initialize the global variables that hold patch agentsets
% a) I1 R8 U& C2 \! e: N set roads patches with
& g1 M- W3 o8 s# B: n$ Q [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or0 ^: y. q0 w! R7 t* z" q! \& b
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]: k1 h* q3 J4 A6 U+ W
set intersections roads with0 @2 m# X, s2 q- H1 f4 q! v* n3 c8 v
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and7 u% x: p7 Y: ^" g6 p
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
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* D+ l4 @, Q8 x; A, V- q2 Aend
# j8 K( f) }2 z其中定义道路的句子,如下所示,是什么意思啊?
9 w% C! h6 J/ q3 D- L' R set roads patches with. g$ t9 q8 e3 p# c4 Y& j# K$ v% d
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
) t9 a/ ^6 w. D8 N$ H (floor((pycor + max-pycor) mod grid-y-inc) = 0)]7 V) U2 x4 b/ ^; B
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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