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计算二重积分的时候，结果就是一个式子，不是积分值，这是为什么呢？求教
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. ? _7 J9 Y! G+ |9 G8 [代码如下：$ U9 U% [& x- M% k/ l
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clear all- a, Z5 d0 L$ y8 r8 m' a4 u
close all
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syms x y# S4 L* D5 j. S0 t
omega=1;8 W5 K) u7 }' L' z
mu=0.001;7 t% t. h* N( X3 y
alpha=0.13;$ V. J- ~9 y2 s
beta=0.0031;5 N0 E6 f+ z! A/ u o9 |
u=0.001;v=-0.02;
% o9 [. A( i3 _. o2 n) Mtau=2.2;tau1=1.5;D=0.11;: J1 E4 s. ^$ Y' B% c6 B" F: ?# Q
tau01=1.42;tau02=1.5;tau03=1.56;tau04=1.9;
* b W2 q1 ^5 ]& G5 f) P N# Aomega2=1-u*cos(omega*tau)-v*omega*sin(omega*tau01);- F5 F$ A/ I/ p4 d2 {3 e8 [
eta=1+(1/mu)*(-(u/omega)*sin(omega*tau)+v*cos(omega*tau01));- i9 l) l0 D3 A6 V8 Y. ~2 Q
K=D/(omega2.*(1+omega2.*(tau1.^2)));
: Y% A# W( V3 @! \- Nf1=(1./(omega2.*K)).*exp(-(mu./(1536.*K)).*(15.*beta.*(x.^2+y.^2./omega2).^4-32.*alpha.*(x.^2+y.^2./omega2).^3+96.*(x.^2+y.^2./omega2).^2-768.*eta.*(x.^2+y.^2./omega2)));- s" ~0 v1 s( W' c0 A6 L1 I
F1=int(int(f1,x,0,10),y,-10,10)& Q5 f% I% {4 |3 A
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结果：- M% [" p# Y, J' I. T0 e
F1=
+ C \$ B: O) v1 |int(int((1029484437153*exp((76368780973521777*(x^2 + (2251799813685248*y^2)/2297649917499219)^3)/922337203685477580800 - (17623564840043487*(x^2 + (2251799813685248*y^2)/2297649917499219)^2)/9223372036854775808 - (546330510041348097*(x^2 + (2251799813685248*y^2)/2297649917499219)^4)/590295810358705651712000 - (3488543873076974433998624506509*x^2)/81129638414606681695789005144064 - (1162847957692324811332874835503*y^2)/27593854166072889506733609713664))/34359738368, x, 0, 10), y, -10, 10)
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发表于 2020-7-1 15:09
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