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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;& n+ |. h4 Z d' `/ g
theta=linspace(0,rad2deg(2*pi),181);4 p* O; O4 r( I; v
y1=[0.512
* b L- ]4 q8 S5 M0.471
7 R& I# Y2 \0 r3 U9 N n0.445
8 D+ H' x) @0 p" B. _1 v0.408
/ m) B+ V7 z4 n1 }1 y8 N% V' V% |0.3826 p& d9 A% L2 q7 L" @
0.347
3 \0 {7 [9 K! ]7 o% U4 Q0.330 x$ H! r) O, C' i" _6 _, s, U
0.295; H) g0 C' D( N5 }$ V
0.275
2 N9 N( ~& p6 G' j0.2449
4 @' T, }/ m! }5 P- i: k0.2222# c8 I* E6 m& H- K
0.1974
* o: Q! {( `/ y; i( T0.1792
, Y8 r6 v. l/ O8 A0.1573
) U+ C6 @7 J; ^; u6 i6 R0.1447
$ q; j$ D, O% v4 q$ {5 G0.1289, b: Q: ] Z8 C5 v% U. g, o
0.1155" ^+ J! {" U: n: B9 D% ?0 V; p4 x% T
0.1072
* S4 y* ~- Y2 `# E" i* H2 N1 Y0.09913 f% I3 n4 ]$ N2 t* h# K
0.092
. {6 }1 Y7 _$ N' p: j: `0.0877
/ w9 X, ]. o0 {* t8 w0.0841
5 B0 K9 w1 _# h4 }! S0.08425 t$ L9 @! f# \
0.0856
$ F6 ~: d, u2 n3 j& m! T! X) u" F0 {0.0869
, F9 V/ n; G/ W5 }- f0.0929
( J9 l* h9 k: m! ]$ A" g; T) E/ Q0.1027
# S; s! K) w1 j9 r" e0.10644 b S* a& P# z6 X5 s" K% h4 C
0.1165
8 Q+ x& H5 p0 R0.1295) a! l- O+ F) g" _$ r
0.1447$ N y/ @. G6 [8 W- A% M
0.1558
4 N6 e M: a& M. {0.1696, \2 Q2 a& Y& M5 ^7 Q- w* H
0.19
5 l. P2 R, |1 @1 ] c' x0.219 b4 {% F, W% J, v
0.2287
: `3 O2 L4 y8 @3 n0.24963 l' v6 g' A' r) U: }& B( E! a
0.2719
! f1 E8 T: Z) e, ?0.2986
8 B5 t$ m" g8 ~0 Z; K, R. d0.3246/ P: \3 q! E9 a+ R; l$ K" O, w
0.3432 x% N9 [" ^5 ?: F) z8 E" W0 }$ _
0.372+ B$ P3 ~; E6 t: O
0.393
$ H0 b) f2 y& o( @# A- q0.415( k9 W- a, R* x2 B" F5 x
0.444
8 T7 H1 s$ g( S- Q: I! Z0.47
! C9 i' ]6 E3 v+ n" g0.494: }$ m ]- m! a5 K2 Q4 C9 J7 U
0.513' h0 {( R$ \2 c4 ~2 T5 N' K
0.542- Z; S7 Q) V4 ~. Z) L
0.573
0 \; W8 r# q: a, I$ {0.6) }: \* I( s3 P: ]5 l% S
0.6135 {& ~# g; o m* N
0.636/ X3 R* F/ V7 j2 Q4 V% I
0.652* p9 k8 F' D; ^9 D
0.675
& |9 i9 j) P4 U6 A7 u, R0.697! c. J$ }1 t) }% r5 O
0.71
% N5 e/ a* v, [% @8 T2 m+ e' {0.7290 X4 a0 b) S; B; f( I. B8 d
0.7426 j! n D8 b* ?. }. l' U
0.76
2 l0 j, x b- x' b9 x& @0.7678 _: A6 y; P; ]5 C8 q$ b; v
0.777" s8 z6 ^1 i. s- H" @ p0 `
0.785
$ n! j* N( P' V$ w0.79, |3 L- C) x8 R1 ^
0.792
7 `: V: t. \% z: u6 N2 Y9 K0.799
1 A) }4 p) `- B9 E0.808
' o, I& J& J/ G" u, Z. h0 o' W" R" u0.795
1 {$ i* }$ d! i5 S/ Y) D5 c# s0.794
( ?% G" V# m/ y0.789, ]/ _) i3 ~; E5 N! S/ v8 l, D
0.786
& H" K$ ]8 \8 @7 P1 \' S# k: O0.785
; B: z2 Q$ `: a0.7829 d, W9 K [9 e" \5 b
0.773
" B; ?; P9 M3 P# y$ T9 t; c0.766
; H% [' ]5 z' Q9 N9 F' U) H0.7460 V% z7 Q5 Q% R# l! f
0.726+ I0 t8 k% k0 T9 W1 B
0.709, L# f6 ~4 c5 v
0.697( C3 w( l) {; X' E1 E7 j6 F1 O
0.6780 S1 T; H4 b2 {2 U
0.658
) c7 D& c" K- ]- Y5 i) k' m0.639
$ i9 L( c0 O3 e. A0 N( ^# g, L* S0.611
. c0 l0 c% s, I' r% v0.597 b) J# W& b8 z2 ]
0.568! j. n2 m/ ?" O: B
0.553
/ x' H9 Y( H4 ?: e# u! Q, l$ r. L0.522
8 E. b/ U) N9 F/ P# y- O0.501+ o) ]6 K0 S- ?2 Y8 s
0.477
5 t* C" P' [' j9 F/ N0.45; Q3 J" i( Y& ]% q- u/ }- ^5 ]
0.421) k* x4 l# t% ^* {+ |$ L
0.3969 e5 l; m' p) s; \: @7 v
0.373
; c8 X- y# Q$ Q; ^8 e0.342% w0 @" @; e7 B* |* Z
0.3196
9 S5 j& b! p. ]9 u0.2984' R5 t6 m; E% R. `0 B- R
0.2686
# B* p$ `/ M; c( z6 M! ~0.2559
- }# ]6 P1 s$ Z4 z2 }0.21469 x* P* Y2 B* S& \5 L
0.2062 u0 U6 } M6 A( k& R7 T8 c, w( x
0.19369 q% a# e+ G5 _9 B. @! V
0.169
, b" M, t0 J) ?9 U0.1516
% }* G9 T3 ^* `/ ], e0.1428
- X2 m7 l0 [. @" W+ w9 @# ?. |0.1234
5 F2 E0 @' M( L2 l0.1139/ M5 l" U9 D0 ^- c' {) n: K
0.1051
; P9 [* W! j1 i! k$ {0.0962" e$ }- m5 W5 u, \* C. x& E
0.08951 b+ D1 s# g. I7 C0 W! l- a
0.0837& A, h7 B5 r4 `+ y3 |2 T2 Z
0.0802
4 i# \4 Z P; j! ]+ N5 `4 w0.07825 Z) _2 u& @( Y8 u+ d" V7 I, T6 z+ s
0.081
. [8 q; q3 ]0 J6 ^0.0798
, U5 |8 n3 f! U/ v& v& ~, U W0.0824
: w0 r: v+ a$ K& i( h7 u. J7 ]5 D0.087! F! H- H. ^5 z2 J5 c
0.0921
& J8 d7 F3 M7 d8 @8 U0.1017
1 s8 q3 [- j" O" v5 m0.1089
9 V& E. Y9 \% v" N/ H" u, }0.1205
' B E. ]: b _7 B. B- w J3 }8 z0.1345, i! M8 D& h* Y3 b& ^$ z
0.1467
" ~3 V7 Q J5 G. f/ M0 R5 W: V0.16! N8 I- V1 T& s7 W! T8 K
0.1759
- u( i" W% w+ M0 u0.19470 m" e' M. k- X
0.2144
7 R* H8 p. _3 K( h0.2307 k7 C# N2 l- @; x6 }: f. K
0.2553- X% | @! {) y9 q$ Z8 i+ o: s/ ^1 Y
0.241
J- Y* x2 y6 f8 u% ?( g0.3002& F( U' q( E3 L7 N$ [2 ]$ t6 w
0.3268
+ J6 k1 a- Z- Z% I3 _$ E0.348
) d1 ^5 Q S1 U: ?6 X: F; \1 ~ f0.369, j, k" C, z; q" S/ w
0.399
) h4 ~- t6 z; ~0.42
Y9 Y8 H E) b* Y# _0.44
" }' W2 E7 @5 F) ~$ a0 n0.466
0 [; Q7 f& q% R) N0.492
. K0 M: v4 J* C& u2 L+ u0.51
* Z4 m) G- j; N; O0 S- x1 p0.535" q* `1 h5 g3 _5 b2 Y
0.555
$ k, t; ] U' p+ Q6 u0.576
+ @, |: D! O( F& F: V3 t0.5926 O2 K0 H/ i/ h6 O0 i# ^6 q, d7 J4 N L8 ~
0.622; z7 g" W! _# Q1 K* C
0.638% p/ P5 p3 T% J2 X5 _4 Y8 i, J
0.6480 [& O. `: n) U. ?: |2 t i2 i7 ^
0.666# R+ N- S( b3 C' C4 b: Y& Y, e& m
0.683 K" F7 v7 x- z- V1 O0 c* t
0.703/ r Z3 f$ L/ l" E" m: R% @
0.714
7 B# i, q! l) Z. V4 a: M# X/ N0.722
" C$ f R( A* d. Y: [0.749
# B% q! o# w0 y0 s0.752
" z& q3 b; t5 {1 _0.752
7 J. J1 A& J- ~1 N2 q( @, R9 \2 y0.759
1 q% A/ U; ^/ Q7 U y0.76; v# U$ F- x7 [, m0 z# q' K
0.759
/ s1 Y. Z9 D0 I1 X1 S N1 f( s2 G0.754: n, j! C$ q" @* R! ]7 Z
0.752! [+ t3 c/ H& p- [% d/ |6 v
0.754# {5 \* M0 k; w$ [3 y5 f
0.751
6 h( C( @9 x( w9 Y" a8 q: a0.7467 M# |/ f7 Y' B7 O r
0.741; z9 `9 H% G7 }# k
0.728! F0 b+ A& @7 b2 `- ?5 L: x8 L
0.715* K+ g9 {1 C* q% F- S
0.7022 e9 D( K5 Z. ?2 Q; L5 G
0.684. f& ?) e* U, G. w
0.677/ X4 T! C3 A0 @* ~4 b; w( \; }
0.662
' B- Z$ v! o! O8 i; \0.6359 z& U2 z0 B' y+ U
0.62
! k' p5 K$ J2 P! y- e, ~0.598
' ]; v/ K1 A5 o0.586
. x" T! ~! N, e$ D7 M1 G0 p+ _0.56
9 \: K* t1 {- `" U) d0.5371 Z' J, s2 X* P! }: J' b% \' l1 O9 C
0.513
3 t* t; ^; {& ]) U7 [0 \' |0.494* q5 y; [: G. V& z% j: s3 W
0.462
% v- Z+ [& E% h0.443
4 b }& n, L+ ], i" d2 @2 ^6 x0.414
/ M% {5 V" r5 K0.385]';# j, U, x( s# j9 V M% _7 ]3 I
% [5000 0 25000 3*pi/55],. J+ D5 b* E- y' D% c) M3 f
a=[0.4 0.1 0.4];2 R p G( | K' ^1 [" |+ Y2 D& V
func_sin = @(a,theta) a(1)*(sin((theta)+a(2)))^2 + a(3);
V1 M0 x' x3 |# ?; d9 x8 `A= lsqcurvefit( func_sin,a,theta,y1);
/ X- Y, I# v4 w! kdisp(A)
) A5 _9 b5 U4 ]( q5 O
" e8 g8 i# H% Z' x$ L( x5 |% G2 U8 a
错误类型：8 U! v! p( w6 J0 G; ~) Q5 D9 [
3 Z2 M) Z" m+ O/ D0 m3 i, N/ Y
出错 Untitledexperiment (line 187)
7 J, O+ J9 t T& l$ h$ w EA= lsqcurvefit( func_sin,a,theta,y1);0 f- s3 r; [3 v8 u% w! }
/ f) \4 ~$ d$ j/ l
原因:6 D+ z/ Q L0 S! P+ |( \
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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