This code computes the Stockwell transform (S-Transform) of a one dimensional series without for loop, thereby making it computationally fast and simple. S-Transform was proposed in 1996. A nice tutorial on S-Transform can be found here:
djj.ee.ntu.edu.tw/S_Transform.pdf
Comments and Ratings (27)
Updates
| 1.1.0.0 | The graphics is for visual demonstration of frequency decomposition only and has been borrowed from the following source:
|
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Acknowledgements
Inspired: Power Quality Disturbance Detection Using S transform, istran(S), Time frequency distribution of a signal using S-transform (stockwell transform), fdst( N, p )
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Mohit Atal Atal (view profile)
give error
Jesus Eiras (view profile)
That gives an error: Matrix dimensions must agree (line 42)
Briana Phillips (view profile)
My vector is a one-dimensional complex timeseries of u and v velocities based on the concept of a rotary spectra, as Stockwell has done recently in his paper inertial oscillations in surface winds. When I use your function there is no x and y labels so I don't know which is negative. Is there any way to turn the x and y labels on? Can this function work for a complex timeseries?
Guilhem Barruol (view profile)
@Ayush : This code seems to output a result which is the conjugate of the one outputted from the original Code by Robert Glenn Stockwell http://www.codeforge.com/read/33451/st.m__html.
Hamdullah Livaoglu (view profile)
BenL (view profile)
may i know how do u plot the magnitude? i got a strange plot when using abs(ST)
Machine Learning Enthusiast (view profile)
hi Baba Dash.can you please provide email?i need to confirm few urgent things.Thank you.
Curtis (view profile)
Works great once, but you may need to transpose the input. The result is a large matrix that can easily over-run you RAM. I had to decimate() my input.
The output is complex, so to get the magnitude plot in the picture you'll need to take the mag() or abs() of the result.
Curtis (view profile)
gfjjjj bbbb (view profile)
Hello
I want to know the parameters that affect the time-frequency resolution for S_transform.
thanks
Elsaeed Ali (view profile)
fine
Mahmoud Ibrahim (view profile)
Dear Mr
I want to draw the frequency spectrum of non stationary transient signal
Did S-transform can be effective in it?
thanks
marie vill (view profile)
hello how can i extract satistatical parameteres from The ST matrix
rubana aafreen (view profile)
why cant i find the code??
rubana aafreen (view profile)
why cant i fond the code??
SAUMYA (view profile)
I CAN NOT GET THE RESULT
Ayush (view profile)
I don't get the same result as from the original Code by Robert Glenn Stockwell http://www.codeforge.com/read/33451/st.m__html please correct the code accordingly.
Ayal (view profile)
no reference, and most importantly, no useful help or internal documentation.
Baba Dash (view profile)
Praveen: The ST matrix is a matrix of complex numbers the magnitude and phase of which can be used as features. Other statistical parameters can also be considered depending on their necessity.
Praveen (view profile)
What kind of features can be extracted after getting the S-transform Matrix?
q 368 (view profile)
Thank you
Mona (view profile)
Thank you Baba Dash, useful neat code!
Tirupal Talari (view profile)
good code
can u plz provide inverse of s-transform
Jan (view profile)
Is there also a fast inverse S transform ?
Demetris (view profile)
Demetris (view profile)
Can this be extended to 2 dimensions?
Sree Lakshmi Deepak (view profile)
How to use this code to simulate power signal generated by DFIG model in Simulink