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想用三角函数拟合一组数据 结果一直报错 感谢大神解答 程序就是源程序clear;
! m C/ L, }. K4 m btheta=linspace(0,rad2deg(2*pi),181);
1 ]. c/ S5 O, ?y1=[0.5123 [# V' B: g7 q2 S8 Z
0.471 @5 B8 o( n5 J6 i2 D2 i
0.445
9 j, e2 d- H% f9 t4 x0.408
5 z; j, F0 k, x3 t; f2 D) l2 G0.382 w( M! P( o+ Z2 r# E; W' c/ Q
0.3471 g, }+ T% M: a
0.333 X, {" m1 _! ^/ f8 l
0.295
& b* h. L/ l1 T$ e1 P; P- h6 L0.275
( h) l4 B4 D* X4 d5 x: J9 e0.2449
3 J+ M [9 k; \! e7 S" c. ~' t; u0.2222" F. X8 s" U/ d Q
0.1974* e# e5 V9 s4 Z' v
0.1792# v, ]3 ~/ u H' m6 G- h
0.1573
" ?7 l. t7 C* r) D& `5 e. z0.14473 B4 Y1 F ~( ?( W8 a7 Q$ S
0.1289
" f3 u3 C5 E* F# X: ]0.1155/ Y3 g. f1 s" m1 d( `
0.1072
% ?" b0 i/ S, H |* }; {- m0.0991
1 [+ B; A) T) c1 y, v0.092
$ m- e0 q" f5 D8 O0.0877
& F9 D! }, Q5 [) | c0.0841
- J0 z! W8 t. ]" z% R0.08428 F6 Q% f& S' x( d( I) k, W! W
0.0856& U- L9 H) k, N5 M) y
0.0869% @6 N/ v' ?; K3 r1 V2 |) F, E4 H
0.0929( T6 t0 h3 e# F/ p
0.1027. }' D; R/ p7 W, p
0.1064
7 `7 f' o3 H8 t8 I7 E& t* x0.1165. h0 Q; i$ {* G" d8 G
0.12957 t) g O9 B9 K' f
0.1447
' u: I& a6 {' \, ^# o2 O0.1558
( J+ k8 k7 z m- _5 Q0.1696: M3 J- a& v8 X2 f
0.194 E* f- P6 G. @. x& g2 c
0.216 {2 D8 |! h# {1 ^4 n
0.2287. ]) d( J8 I1 Q2 B
0.2496
% l @2 @/ N0 Z3 G3 d9 D& }" H, _: u0.2719
% G; u8 x! \0 i! E A7 W0.2986
+ L$ H, L) t0 o& r0 G0.32465 m5 m- ?( \6 B; H& N
0.343
' ~, g. P7 ^/ r, ]8 r# ^# i7 G0.372; F/ H7 }% s& G0 r8 b
0.393$ A" n o+ b/ \
0.415! O- ^) c, T2 G D6 q
0.444( g; l. h- b8 _+ N
0.472 Q% y- p+ G/ X3 u
0.494! e( k1 x) a8 C. g+ f" Z
0.513
! q1 z% K( X7 I, T$ V. r0.542/ r% T1 d- \; `$ k4 ~
0.573
" F! l" c6 a5 c0.67 k3 S/ a# x6 U
0.613
& E, }) J: D5 }+ B0.636% G6 {# ` A$ h7 M8 n% s
0.652
* e% f& ~( n! d# U) _5 o9 e0.6753 o3 N. l9 Q' K: y( Q7 |
0.697
& R% |3 I) h9 a* v% V/ O0.71
2 E4 E# N7 I) M! _; U* w, n0.729
4 b8 v$ u X* w# M; M ?) \) j0.7426 ?+ s/ k. Z% X4 u
0.76
3 h& k; G8 I- r/ q: T0.767
- x% c! P' w$ R, p4 h0.777
( F( n9 Z" y4 Q0.7853 J& c( \0 o7 _+ f4 ?' [
0.79
" W: |2 | M j' W0.792
/ a! p' S) `5 [5 n& V0.799/ N" t6 W1 u5 l% C
0.808+ p; [+ Q, E' P+ Z6 S% o( [9 U* r
0.795+ ^* W% U( E' ~. K$ M) X: i, v2 A! D
0.7947 s" O3 c+ W4 K' C; @3 L9 z4 x7 R
0.789
( H& g8 a1 K7 q4 ^$ Z1 C5 K9 [( ]0.786$ Q; i* t+ ?3 r/ j- d( r
0.785) ~, c. ^( B5 v; t/ r' X' V/ X
0.782% B7 _. _1 [5 U% |
0.773* Y' ~0 i4 S2 ]( F% p
0.766& E2 A& a' ] e" b$ r8 C) c8 b
0.746* H" W' B+ S U; O6 Z" K" ~3 o
0.726
U+ v. e# g0 k0.7098 K5 @/ {$ d7 N* z1 p# N5 r% o: H
0.697' [4 W: e. Y& R
0.678
$ q% s" h5 `1 U, U+ ^0.658
5 A! Z+ I: Z( }5 n. B6 q0.639
2 L8 o6 g2 V% J, {0.6112 `9 w& P* D2 `* Z; u$ p
0.597
* d7 X4 _/ P# o1 n' h' y v0.568
9 H' C+ y3 }, ?0.553
; ^8 c2 @. ]( W9 D) g$ G; W0 ?" a0.522# I, q! u/ _! x$ m
0.501
' \6 L7 _$ j f K7 x0.477
. m% m4 u8 |# {1 j* ^2 x# N! h' L0.453 ~# \1 ~5 m( y, _- c# r& i v/ Z$ Q* @
0.421% W" K+ E+ J q% i
0.396! b0 h; G1 R5 D2 l, [
0.373
4 n ?2 s: H6 M' |0.342
' y6 H' c+ s1 U$ h7 j0.3196% w* N/ i5 h" \( k
0.2984# S2 T$ q6 N6 T$ K( v# {
0.2686
6 C' f, p0 V7 q' O# Q0.2559+ t3 r# c7 k* m1 H
0.2146
/ V; q' h! v q6 W* \4 `0 G2 y A0.2065 S& @* p) N$ p9 z3 \7 ~1 M/ d
0.19365 D. q% I8 x8 D! o' `
0.169
# U: u9 s+ c& S6 A' u0.1516
/ ^! N: l* j, @0.1428
% ?4 o9 z9 [+ s4 z0.1234( y1 c* v# V7 R# D" O+ O; y. }
0.1139) D. X+ x1 K0 c1 F
0.10512 J- ~5 v" w. _/ `* |
0.09625 `) j; C7 e$ o3 m4 c: u* \
0.0895 q, T" g1 n# ~, p: k. N
0.08375 ~% @3 P; @5 O/ `7 |
0.08024 `! u7 W+ E( h$ T- Y
0.07826 T! C" K* a, e
0.081
: E; Z3 x, T% ~7 n2 Q1 V0.0798
+ n0 c9 Q# Y, b0 o6 t7 \* n& D0.0824
* Z- J4 I/ E5 P3 o0.0875 L) z0 R% [8 T
0.0921
, M1 G( ]# |5 _4 G9 [1 R' k4 M0.10179 G w8 `5 g/ e+ ?9 H
0.1089
( E0 w6 c) W$ C) S1 {1 o7 o0.1205
5 {1 k9 |2 _ O2 V) L* S* S |0.1345
1 m9 }& L5 h8 r, M0 u0.1467
6 O% l# T6 Y& \! E+ s0.16
" |) D, J; ^( C% e; M, m/ ?0.17590 O) A- Y1 c+ [& T
0.1947# O# a5 L l8 x# i; _
0.2144
/ y" H( J; \. |: E# j0.2307
4 s+ N- w9 {% q5 h- N+ W* w6 k0.2553' w9 T# U( s1 w
0.241( w6 N* G7 |' x$ K: }2 u
0.30027 b2 J ~$ Y! t2 c
0.3268
8 Y# e; m9 J% F7 r5 x8 Z0.348! ^8 x S) W: {2 w
0.369; c: J* _5 V0 Q4 }3 e; K
0.3999 H" C$ S4 s' f
0.42% b% c; A# ~. J5 h1 R
0.441 {% k4 v" K: _, l& b5 `- M' b
0.466
% ~# x& _8 u" {# ]" y; n! p0.492
8 `% `" n+ h3 G) K! O0 f0.51
7 w/ O* z' W7 g0.535- q5 T3 Q# {. V( t
0.555$ Y) Q, H9 t+ b$ z: m$ F
0.576
5 A+ A/ J2 Q" v% _, R0.5929 a0 P/ b; `7 @9 A: s# a! b
0.622. u: ]* j" Q; _( M. J
0.638
& s+ q% J6 z z2 Y5 c& I; Q0.648: t5 b: V* y& ?6 {( d* ^9 `4 X
0.6667 b$ ?; R, p# w
0.683
3 S3 v$ T' C& [6 a1 [0.7038 l5 j% z# L7 N, U4 k" O
0.714( c5 d8 S3 v ?" f4 d7 @" ^% \8 s
0.722
' [* I" }: L2 Z6 r# I6 Q3 m0.7490 J# h# s, f2 Q% F: Y
0.752
9 Y; J' t# M0 B, I* ]- G- d/ A0.752
/ r2 X% {8 F, a& t5 p5 t0.759
: y0 C1 |! _. O3 d( `( ?. G! ^0.76
1 [5 a' K( F2 h0 N% x8 X- H/ |0.759# e) T5 M8 B, w
0.754
/ f* P0 F7 o. B8 Z0 }0.752* ]; y1 }1 ^5 C" S: C$ Y5 }
0.754
1 ~1 x3 g) I# ~/ l/ a0.751
$ @* T2 J. a" z9 t0.7462 \" n2 W9 l7 A% m9 X. ?! u
0.741 U9 A& F% T: i: A7 t5 }, h
0.728 V3 K% @6 s( ^1 V$ N# W4 W# m
0.715' c2 `' _9 \5 n) y% c% w* F, V
0.702
: Q9 F( }$ F; _8 P- G: F0.684
5 \ N3 B) e* W0.6773 i7 e- \0 M6 T* L0 x
0.662
" `+ h0 A; c- y* l7 k, q. ?0.635
X" Y$ M1 v* O# t0.62
0 O+ _! ]9 H" q: `9 R+ j0.598
+ h! a* r) s# b6 s0.586; a# N/ K+ g4 Q3 l9 [5 ]
0.56- g& q! S1 U/ J j2 R |7 l
0.537
5 m! Z2 b2 U% f2 @8 \0 a0.513" M5 V0 e9 A- N' k3 H
0.494
: U! S' O% A: ?) D9 {0.462
R( P4 C9 C5 `' W0.443
7 m" H6 Y( [* {6 o/ i* `0.414
2 F; g8 @- e6 p6 [ w; x/ _0.385]';
/ L% h" D* y2 {- y6 l* s. l% [5000 0 25000 3*pi/55],
+ B3 a5 o* Q, V3 Ta=[0.4 0.1 0.4];+ Z$ M, V- R. w2 L- c y4 n
func_sin = @(a,theta) a(1)*(sin((theta)+a(2)))^2 + a(3);' l5 C- R$ H5 y4 s* ]( s2 z$ `
A= lsqcurvefit( func_sin,a,theta,y1);2 C0 D0 ]# z0 U) o0 z
disp(A)3 j$ W( Z/ C# y4 K8 E% d1 f! }
. F6 m, w* e9 Q& K4 `; m, m P$ |* ]. X: u4 v0 X6 w6 X% R
错误类型：
0 |) _: b- m: T2 I* o& c4 {6 O1 @6 D* K+ p. _. G3 s1 ~
出错 Untitledexperiment (line 187)5 j9 U$ M* n: Y2 l" j
A= lsqcurvefit( func_sin,a,theta,y1);
; I( Z$ j0 E7 r/ z
# A+ m& v+ v" o原因:
& N3 L2 l; q5 x' x# s Failure in initial user-supplied objective function evaluation. LSQCURVEFIT cannot continue. |
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发表于 2020-3-12 13:56
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