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java.lang.Object | +--jnt.FFT.ComplexDouble2DFFT
Computes the FFT of 2 dimensional complex, double precision data. The data is stored in a 1-dimensional array in Row-Major order. The physical layout in the array data, of the mathematical data d[i,j] is as follows:
Re(d[i,j]) = data[i*rowspan + 2*j] Im(d[i,j]) = data[i*rowspan + 2*j + 1]where
rowspan
must be at least 2*ncols (it defaults to 2*ncols).
The transformed data is returned in the original data array in
wrap-around order along each dimension.
Constructor Summary | |
ComplexDouble2DFFT(int nrows,
int ncols)
Create an FFT for transforming nrows*ncols points of Complex, double precision data. |
Method Summary | |
void |
backtransform(double[] data)
Compute the (unnomalized) inverse FFT of data, leaving it in place. |
void |
backtransform(double[] data,
int rowspan)
Compute the (unnomalized) inverse FFT of data, leaving it in place. |
protected void |
checkData(double[] data,
int rowspan)
|
void |
inverse(double[] data)
Compute the (nomalized) inverse FFT of data, leaving it in place. |
void |
inverse(double[] data,
int rowspan)
Compute the (nomalized) inverse FFT of data, leaving it in place. |
double |
normalization()
Return the normalization factor. |
double[] |
toWraparoundOrder(double[] data)
Return data in wraparound order. |
double[] |
toWraparoundOrder(double[] data,
int rowspan)
Return data in wraparound order. |
void |
transform(double[] data)
Compute the Fast Fourier Transform of data leaving the result in data. |
void |
transform(double[] data,
int rowspan)
Compute the Fast Fourier Transform of data leaving the result in data. |
Methods inherited from class java.lang.Object |
clone,
equals,
finalize,
getClass,
hashCode,
notify,
notifyAll,
toString,
wait,
wait,
wait |
Constructor Detail |
public ComplexDouble2DFFT(int nrows, int ncols)
Method Detail |
protected void checkData(double[] data, int rowspan)
public void transform(double[] data)
public void transform(double[] data, int rowspan)
public double[] toWraparoundOrder(double[] data)
public double[] toWraparoundOrder(double[] data, int rowspan)
public void backtransform(double[] data)
public void backtransform(double[] data, int rowspan)
public double normalization()
public void inverse(double[] data)
public void inverse(double[] data, int rowspan)
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