求函数fourier积分f(t)={1-t^2丨t丨1
realt,ftprint*,"inputt:"read(*,*)tif(abs(t).lt.1.)thenft=1.-t**2elseif(abs(t).gt.1.)thenft=0.elseprint*,"inputnumberisnotproper"endifend
举一反三
- 设A,B均为三阶矩阵,丨A丨=-2丨B丨=3,则丨2A*B^T丨=
- 设5阶矩阵丨A丨=3,则丨2A^T丨=
- 丨1-2/1丨+丨2/1-3/1丨+丨3/1-4/1丨+丨4/1-5/1丨+丨5/1-6/1丨+丨6/1-7/1丨+丨7/1+8/1丨+丨8/1+9/1丨+丨9/1+10/1丨
- 丨1/2-1丨十丨1/3-1/2丨十丨1/4-1/3丨十.丨1/2014-1/2013丨
- 若F(ω)=[f(t)]，利用Fourier变换的性质求下列函数g(t)的Fourier变换．(1)g(t)=tf(2t)；(2)g(t)=(t一2)f(t)；(3)g(t)=(t一2)f(一2t)；(4)g(t)=t3f(2t)；(5)g(t)=tf’(t)；(6)g(t)=f(1一t)；(7)g(t)=(1一t)f(1一t)；(8)g(t)=f(2t一5)．
内容
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f(t)函数频谱为f(jw),求(1-t)f(1-t)的频谱
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设z为复数,且丨z丨=丨z+1丨=1求丨z-1丨
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【多选题】若f 1 (t) = ɛ (-t) , f 2 (t) = e t ,则f 1 (t)* f 2 (t) = A. f 1 ꞌ (t)* f 2 (–1) (t) B. f 1 (–1) (t)* f 2 ꞌ (t) C. f 1 (t-3)* f 2 (t+3) D. f 1 (–3) (t)* f 2 ꞌꞌꞌ (t)
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已知丨a丨/a+丨b丨/b+丨c丨/c=-1,求abc/丨abc丨的值
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丨3/1-2/1丨+丨4/1-3/1丨+丨5/1-4/1丨+...+丨2011/1-2010/1丨=?