comsol传热模拟时,求解出现奇异矩阵是什么情况?怎么解决
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发布时间：2022-10-15 22:37
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热心网友
时间：2023-10-13 01:22
=∫[0,1]x∫[-1,0]e^xydydx
=∫[0,1]x*[lne^(xy)*e^(xy)][-1,0]dx
=∫[0,1]x*[(xy)*e^(xy)][-1,0]dx
=∫[0,1]x*[x*e^(-x)]dx
=∫[0,1]x^2*e^(-x)dx
=-x^2*e^(-x)[0,1]+∫[0,1]e^(-x)dx^2
=-1/e+2∫[0,1]xe^(-x)dx
=-1/e-2xe^(-x)[0,1]+2∫[0,1]e^(-x)dx
=-3/e+2∫[0,1]e^(-x)dx
=-3/e-2e^(-x)[0,1]
=2-5/e
