Overload List
| # | Signature | Description |
|---|---|---|
| 1 | function IFFT(const Vec: TVec; NoScale: Boolean): TVec; | Calculate the inverse FFT from all Vec elements and store the results in the calling vector. |
| 2 | function IFFT(NoScale: Boolean): TVec; | The inverse backward FFT from complex to complex. |
| 3 | function IFFT(const Vec: TMtxVec; VecIndex: Integer; Index: Integer; Len: Integer; NoScale: Boolean): TMtxVec; | The inverse FFT from complex to complex. |
Overload 1: function IFFT(const Vec: TVec; NoScale: Boolean): TVec;
Calculate the inverse FFT from all Vec elements and store the results in the calling vector.
| # | Name | Type | Description |
|---|---|---|---|
| 1 | Vec | TVec | |
| 2 | NoScale | Boolean |
Result: stored in self (calling object), returns self for chaining
If the NoScale parameter is true then no scaling is performed for the calling vector. Vec Vector.Length must not be the power of two. Vector.Length and Vector.Complex properties of the calling vector are set implicitly to match Vec vector.
Overload 2: function IFFT(NoScale: Boolean): TVec;
The inverse backward FFT from complex to complex.
| # | Name | Type | Description |
|---|---|---|---|
| 1 | NoScale | Boolean |
Result: stored in self (calling object), returns self for chaining
Calculates the inverse (backward) Fast Fourier Transformation (FFT) from complex to complex for all calling vector elements in-place. If the NoScale parameter is true, then no scaling is performed for the calling vector. The results can be erroneous if overflow or underflow occurs.
var a,b: Vector;
begin
a.SetIt(True,[1,2,3,4]);
b.IFFT(a,True);
end;Overload 3: function IFFT(const Vec: TMtxVec; VecIndex: Integer; Index: Integer; Len: Integer; NoScale: Boolean): TMtxVec;
The inverse FFT from complex to complex.
| # | Name | Type | Description |
|---|---|---|---|
| 1 | Vec | TMtxVec | |
| 2 | VecIndex | Integer | |
| 3 | Index | Integer | start index |
| 4 | Len | Integer | element count |
| 5 | NoScale | Boolean |
Result: stored in self (calling object), returns self for chaining
Calculate the inverse FFT from Vec elements [VecIndex]..[VecIndex+Len-1] and store the results in the calling object elements [Index]..[Index+Len-1]. The Len parameter must be the power of two. Size and Vector.Complex properties of the calling vector must be set explicitly. An exception is raised if Vector.ConditionCheck is True and array borders are overrun.
Note
This is the indexed version of the FFT routine TVec.IFFT. Look there For more information on FFT parameters and storage requirements.