Community Profile # Lisa Justin

Last seen: oltre 2 anni ago Active since 2011

Professional Interests: Signal Processing

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Question

Plotting only highest peaks from multiple signals
Hi, I need to extract only the peaks of three signals so I have one plot without changing the amplitude of the individual plots...

circa 3 anni ago | 3 answers | 0

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Question

Moving Average using a for loop
Hi, How can I compute the moving average using a for loop and without using convolution (i.e conv()) or the filter function (i....

oltre 8 anni ago | 1 answer | 0

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which wavelet transform for image compreesion yields better compression and better PSNR value?
Try complex Morlet Wavelet see http://www.bth.se/fou/cuppsats.nsf/all/315e9a86357c82d8c1257b0b002cc52e/\$file/BTH%202013%20Ibe...

oltre 8 anni ago | 0

I need to find instantaneous frequency with phase of continuous wavelet transform using complex morlet wavelet as mother wavelet i.e( ridge-plot ) and also with the help of maximum modulus of CWT
Convert scale to frequency by: frequency= 1/0.033.*scale see http://www.bth.se/fou/cuppsats.nsf/all/315e9a86357c82d8c1257...

oltre 8 anni ago | 0

How to plot time vs frequency in a wavelet transform?
Convert scale to frequency by frequency= 1/0.033*scale see http://www.bth.se/fou/cuppsats.nsf/all/315e9a86357c82d8c1257...

oltre 8 anni ago | 0

Wavelet Transforms using mother wavelets
I recommend you read the master thesis on the link. http://www.bth.se/fou/cuppsats.nsf/all/315e9a86357c82d8c1257b0b002cc52e/\$...

oltre 8 anni ago | 0

Is it possible to implement continous complex morlet wavelet transform practically ?
You could write your own wavelet script and implement it without using the matlab toolbox. see http://www.bth.se/fou/cuppsats...

oltre 8 anni ago | 0

wavelet transform
I think it is best to write your own script see master thesis report could help http://www.bth.se/fou/cuppsats.nsf/all/315e9...

oltre 8 anni ago | 0

two data in one plot graph
Sara is correct, you could also use plot(x,y1,'r') hold on plot(x,y2,'b')

oltre 8 anni ago | 0

How do I perform envelop on a time signal
see http://www.mathworks.se/matlabcentral/answers/47237-how-to-create-an-envelop-from-three-graphs x = 1:100; y1...

oltre 8 anni ago | 0

The difference between the amplitudes of Fourier transform and wavelet transform
It depends on the window function used.

oltre 8 anni ago | 0

How do I compute the mean square value of a function
mean square value=mean(y.^2)

oltre 8 anni ago | 0

Question

How can i Resample?
I have two signals measured with different sampling frequencies Signal 1 has a sampling frequency of 999.9917Hz while Signa...

oltre 8 anni ago | 2 answers | 0

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Question

How can I compute Kurtosis
How is Kurtosis computed in matlab?

circa 9 anni ago | 1 answer | 0

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Question

How to compute the Sampling frequency from Time Stamps
Hi, I have the time stamps of a given signal xn, how can i compute the sampling frequency of this signal, it was not given?

circa 9 anni ago | 1 answer | 0

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Question

What is the purpose of Resampling if it doesn't change the original bandwith of the signal?
What is the purpose of Resampling if it doesn't change the original bandwith of the signal? I have a low sampled analog signal, ...

oltre 9 anni ago | 1 answer | 0

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Question

how noverlap be estimated for 75% percent overlap
How can i estimate 75% overlap? nfft=512 overlap=0.75 noverlap=nfft*overlap is noverlap correct? I get error in my ...

oltre 9 anni ago | 1 answer | 0

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Question

making different signals equal in length
Hi, I am working with a set of data and i need all of them to be the same length. how can i do this?

circa 10 anni ago | 3 answers | 0

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How to generate a signal with time varying frequency?
Use wavelet transform or Short time fourier transform. I prefer wavelet tranform for nonstationary signals

circa 10 anni ago | 0

Question

How can determine the sampling frequency from a time series data?
i need the sampling frequenccy of a give time series data. it is a 1x31225 time data if i choose any two point say x(:,1) and x...

circa 10 anni ago | 2 answers | 1

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CSV vs MAT files
i have a csv file and want to convert it to a matlab file. how can i do this?

circa 10 anni ago | 0

Question

creating an input list from a large data set
Hi! I want to create an input list from a large data set. dir .*csv displays all the csv but when i do dir='C:\Lisajust...

circa 10 anni ago | 3 answers | 0

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Question

saving a csv file as a .mat file
How can i save a csv file as a .mat file

circa 10 anni ago | 3 answers | 0

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Import CSV file to 2012b make Windows 8 Entire UI hang!
you can try fopen, feof, fgets,regexprep,sscanf and fclose or fid=fopen(filename.csv') a = fread(fid,1,'uint32','l'); ...

circa 10 anni ago | 0

Question

How can i read a csv file
How can i read a csv file. i used fopen but it gives a value of -1 A=fopen('slip.csv')

circa 10 anni ago | 2 answers | 0

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Question

How to create an envelop from three graphs
How can i create an envelop for three different Signals. the edges around the three signals that are top most, so there is an en...

circa 10 anni ago | 1 answer | 0

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Question

Marking the peak of a plot automatically without having to click on it
Hi, Is it possible to mark the peak of a plot automatically with a command without having to to mark on each plot.

circa 10 anni ago | 4 answers | 1

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Question

how can i have three plots on one graph and save all three plots using one name
I have a loop with four files, how can i have three plots on one graph and save all three plots using each filename? so i get fo...

circa 10 anni ago | 1 answer | 0

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Question

Area of a Spectrum
What matlab command can give me the area of a spectrum. I have shock response spectrum but i need to find the area under the cu...

circa 10 anni ago | 2 answers | 0