用matlab求二重积分>> syms x y;>>f=exp(-x^2/2)*sin(x^2+y);>>int(int(f,y,-2,2),x,-1,1)输出是ans=(10^(1/2)*(1-2*i)^(1/2)*pi^(1/2)*erf((2+4*i)^(1/2)/2)*sin(2)*i)/5- (10^(1/2)*(1 + 2*i)^(1/2)*pi^(1/2)*erf((2 - 4*i)^(1/2)/2)*sin(2)*i)/5为什么
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![用matlab求二重积分>> syms x y;>>f=exp(-x^2/2)*sin(x^2+y);>>int(int(f,y,-2,2),x,-1,1)输出是ans=(10^(1/2)*(1-2*i)^(1/2)*pi^(1/2)*erf((2+4*i)^(1/2)/2)*sin(2)*i)/5- (10^(1/2)*(1 + 2*i)^(1/2)*pi^(1/2)*erf((2 - 4*i)^(1/2)/2)*sin(2)*i)/5为什么](/uploads/image/z/9292534-70-4.jpg?t=%E7%94%A8matlab%E6%B1%82%E4%BA%8C%E9%87%8D%E7%A7%AF%E5%88%86%3E%3E+syms+x+y%3B%3E%3Ef%3Dexp%28-x%5E2%2F2%29%2Asin%28x%5E2%2By%29%3B%3E%3Eint%28int%28f%2Cy%2C-2%2C2%29%2Cx%2C-1%2C1%29%E8%BE%93%E5%87%BA%E6%98%AFans%3D%2810%5E%281%2F2%29%2A%281-2%2Ai%29%5E%281%2F2%29%2Api%5E%281%2F2%29%2Aerf%28%282%2B4%2Ai%29%5E%281%2F2%29%2F2%29%2Asin%282%29%2Ai%29%2F5-+%2810%5E%281%2F2%29%2A%281+%2B+2%2Ai%29%5E%281%2F2%29%2Api%5E%281%2F2%29%2Aerf%28%282+-+4%2Ai%29%5E%281%2F2%29%2F2%29%2Asin%282%29%2Ai%29%2F5%E4%B8%BA%E4%BB%80%E4%B9%88)
用matlab求二重积分>> syms x y;>>f=exp(-x^2/2)*sin(x^2+y);>>int(int(f,y,-2,2),x,-1,1)输出是ans=(10^(1/2)*(1-2*i)^(1/2)*pi^(1/2)*erf((2+4*i)^(1/2)/2)*sin(2)*i)/5- (10^(1/2)*(1 + 2*i)^(1/2)*pi^(1/2)*erf((2 - 4*i)^(1/2)/2)*sin(2)*i)/5为什么
用matlab求二重积分
>> syms x y;
>>f=exp(-x^2/2)*sin(x^2+y);
>>int(int(f,y,-2,2),x,-1,1)
输出是
ans=(10^(1/2)*(1-2*i)^(1/2)*pi^(1/2)*erf((2+4*i)^(1/2)/2)*sin(2)*i)/5- (10^(1/2)*(1 + 2*i)^(1/2)*pi^(1/2)*erf((2 - 4*i)^(1/2)/2)*sin(2)*i)/5
为什么不是个数呢?
用matlab求二重积分>> syms x y;>>f=exp(-x^2/2)*sin(x^2+y);>>int(int(f,y,-2,2),x,-1,1)输出是ans=(10^(1/2)*(1-2*i)^(1/2)*pi^(1/2)*erf((2+4*i)^(1/2)/2)*sin(2)*i)/5- (10^(1/2)*(1 + 2*i)^(1/2)*pi^(1/2)*erf((2 - 4*i)^(1/2)/2)*sin(2)*i)/5为什么
结果里没有x和y,就是一个数值啊...
result = int(int(f,y,-2,2),x,-1,1);
vpa(result)
ans =
.84884359988601876434271922955192+.45823903690880558106265166987066e-33*i