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本帖最后由 mytomorrow 于 2019-12-10 10:08 编辑 1 O/ h a3 j- y6 N. K, o/ z% d: P
+ L: k- C, e+ _+ w* f; T4 p目录 ifft Syntax Description
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ifft ( H5 |) z( R" b, F& i6 Y. z% \
Inverse fast Fourier transform
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Syntax $ Q T& w4 P+ _! W
X = ifft(Y)
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X = ifft(Y,n) / G) k0 ^/ i$ ~( w" h
X = ifft(Y,n,dim)
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X = ifft(___,symflag) 4 y! ]4 c4 \" `/ L
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Description
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X = ifft(Y) 0 \7 L' u" r. w2 ]8 T
X = ifft(Y) computes the inverse discrete Fourier transform of Y using a fast Fourier transform algorithm. X is the same size as Y.
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- If Y is a vector, then ifft(Y) returns the inverse transform of the vector.* B( ~! w; ?: x# Y) x7 f) w6 _: @$ F
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- If Y is a matrix, then ifft(Y) returns the inverse transform of each column of the matrix.
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- If Y is a multidimensional array, then ifft(Y) treats the values along the first dimension whose size does not equal 1 as vectors and returns the inverse transform of each vector.
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本想翻译一下的,但是手册里面的英文描述的太清晰了,单词也很简单,所以就这样直接看吧。 ! \1 S. [/ q2 m0 C" `& w, o
X = ifft(Y,n) returns the n-point inverse Fourier transform of Y by padding Y with trailing zeros to length n. 3 F. e- I( ~) z) e1 A# @
X = ifft(Y,n,dim) returns the inverse Fourier transform along the dimension dim. For example, if Y is a matrix, then ifft(Y,n,2) returns the n-point inverse transform of each row.
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X = ifft(Y,n,dim)沿维度dim返回逆傅立叶变换。 例如,如果Y是矩阵,则ifft(Y,n,2)返回每行的n点逆变换。
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X = ifft(___,symflag) specifies the symmetry of Y. For example, ifft(Y,'symmetric') treats Y as conjugate symmetric.
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X = ifft(___,symflag)指定Y的对称性。例如,ifft(Y,'symmetric')将Y视为共轭对称。
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