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MattChen1316

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ÏëÓÃ2D¸µÀïÒ¶±ä»»½â¸ö²´ËÉ·½³ÌUxx+Uyy=f(x,y).
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Ëã·¨¾ÍÈý²½£º 1. ¶Ôf(x,y)×ö¸µÀïÒ¶±ä»»µÃµ½f^(x,y)
                    2. ½á¹û³ËÒÔ¹«Ê½ÀïµÄϵÊý
                    3. ×ö¸µÀïÒ¶Äæ±ä»»µÃµ½ÊýÖµ½âu(x,y)

n = 100;
h = 1/(n+1);

x=0:h:1;
y=0:h:1;

[j,k]=meshgrid(x,y);
f = 6*j+6*k;

lambda=2*(1-cos(2*(0:n+1)*pi/(n+1)));
lambda_rec=1./(eps+(lambda'*ones(1,n+2)+ones(n+2,1)*lambda));
fft2u = h*h*lambda_rec.*fft2(f);
u = ifft2(fft2u);
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2Â¥2018-01-09 22:46:15
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