Matlab 变量值直接输出 和 sprintf输出 不同是怎么回事？

ubeautqq

nitao=2.175;
nitae=2.18;
& t* ]* s- j+ D1 p  ]: |derta33=30.3;
0 f& t. m# j! o" Wderta13=5.7;
L=0.1;%m
lamda0=0.633*10^(-6);%m
# i% ^' S. }+ C3 J% ^Vm=100;%v
e=43;
, j+ \5 W9 t1 UA=10^(-3);%m^2
+ H! V2 j1 P2 m7 N+ cdertaf=10^7;%Hz

( ?; P8 |2 m9 k( N7 \0 n; jsyms Ez;
# x7 S3 [, ~) y( p7 r' B$ AE=solve(2*pi*L/lamda0*((nitao-nitae)+Ez*(nitae^3*derta33-nitao^3*derta13)/2)==pi,Ez);
E
sprintf('半波电场强度：%e','E')
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0 u3 v( X5 {3 M5 @Vpi=E*L;
  f' M6 t3 U, E$ a2 xdertaph=Vm*pi/Vpi;
dertaph
sprintf('相位延迟：%e','dertaph')
# e" R# D4 x$ R0 r( ?
P=e*A*Vpi^2*dertaph^2*dertaf/(pi*L);
P
sprintf('驱动功率%e','P')
1 ]- `: ]- W& j: B/ T

8 v7 q# [% d- m. N结果：
3 l% [: H5 i, N# B2 zE =
(9444732965739290427392*pi)/1196549586897533007794808436155 + 11258999068427/287405211048345088
ans =
半波电场强度：6.900000e+01
dertaph =
(100*pi)/((4722366482869645213696*pi)/5982747934487665038974042180775 + 11258999068427/2874052110483450880)
ans =
相位延迟：1.000000e+02相位延迟：1.010000e+02相位延迟：1.140000e+02相位延迟：1.160000e+02相位延迟：9.700000e+01相位延迟：1.120000e+02相位延迟：1.040000e+02
  i- u( {0 }2 rP =
$ a; B: m& a' z* L7 v* L43000000000*pi
ans =
驱动功率8.000000e+01
! s* M5 B5 H  Q4 J' K+ L8 I为什么变量值和sprintf的值不一样？
# |# S9 O( W' N! E# _0 O0 i! X0 t为什么相位延迟有这么多个？
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kinidrily

之前遇到过
! @. a/ m7 |  r! z
$ i# _$ q" K; F' _4 Q! m3 [

• syms Ez;
• E=solve(2*pi*L/lamda0*((nitao-nitae)+Ez*(nitae^3*derta33-nitao^3*derta13)/2)==pi,Ez);
• E
• sprintf('半波电场强度：%e',double(E))
• 
  0 U( s! a2 I3 k7 c5 q9 Z
• Vpi=E*L;
• dertaph=Vm*pi/Vpi;
• dertaph
• sprintf('相位延迟：%e',double(dertaph))
• 
  * g3 j/ _6 [+ r/ q0 x0 [6 B) ^
• P=e*A*Vpi^2*dertaph^2*dertaf/(pi*L);
• P
• sprintf('驱动功率%e',double(P))
  1 k$ N5 j% Q4 v

' W! O6 s( `$ L) S7 |
4 G' V! u. \% _  F8 ~( m2 P9 c/ |就得到：

E =
(9444732965739290427392*pi)/1196549586897533007794808436155 + 11258999068427/287405211048345088
ans =
8 N" O6 ~1 A4 K0 {* G 半波电场强度：3.919945e-05
dertaph =
(100*pi)/((4722366482869645213696*pi)/5982747934487665038974042180775 + 11258999068427/2874052110483450880)
ans =
, s! S3 C8 K2 y) ~5 o9 x相位延迟：8.014380e+07
- ^, r  I+ Q& u& @: J- GP =
! v# m$ S0 P# X' m) A 43000000000*pi
) ~4 e, Q/ o  r; @ ans =
/ D) i* d8 [* }% M& s驱动功率1.350885e+11


8 P! \& @& \6 j0 A( F9 r是符合的
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yxlk

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