Scilab 5.5.2
Please note that the recommended version of Scilab is 2025.0.0. This page might be outdated.
See the recommended documentation of this function
ifftshift
inverse of fftshift
Calling Sequence
y=ifftshift(x)
Arguments
- x, y
real or complex vector or matrix.
Description
ifftshift(x)
swaps the left and right halves of the vector x
.
For matrices, ifftshift(x)
swaps the first quadrant with the third and the second quadrant with the fourth.
If x
is a multidimensional array,
ifftshift(x)
swaps "half-spaces" of x
along each dimension.
Examples
Example #1:
// Make a signal t = 0:0.1:1000; x = 3*sin(t)+8*sin(3*t)+0.5*sin(5*t)+3*rand(t); // Compute the fft y = fft(x, -1); // Invert the result shift = fftshift(y); // Invert the inverted result invShift = ifftshift(shift); // Check that we recreated the original result and(y == invShift)
Example #2:
// Make a 2D image t = 0:0.1:30; x = 3*sin(t')*cos(2*t)+8*sin(3*t')*sin(5*t)+.. 0.5*sin(5*t')*sin(5*t)+3*rand(t')*rand(t); // Compute the fft y = fft(x,-1); // Invert the result shift = fftshift(y); // Invert the inverted result invShift = ifftshift(shift); // Check that we recreated the original result and(y == invShift)
See Also
Report an issue | ||
<< hilbert | Signal Processing | mrfit >> |