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Lisa Justin


Last seen: bijna 5 jaar ago |  Active since 2011

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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...

bijna 5 jaar ago | 3 answers | 0

3

answers

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....

meer dan 10 jaar ago | 1 answer | 0

1

answer

Answered
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...

meer dan 10 jaar ago | 0

Answered
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...

meer dan 10 jaar ago | 0

Answered
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...

meer dan 10 jaar ago | 0

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

meer dan 10 jaar ago | 0

Answered
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...

meer dan 10 jaar ago | 0

Answered
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...

meer dan 10 jaar ago | 0

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

meer dan 10 jaar ago | 0

Answered
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...

meer dan 10 jaar ago | 0

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

meer dan 10 jaar ago | 0

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

meer dan 10 jaar 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...

meer dan 10 jaar ago | 2 answers | 0

2

answers

Question


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

ongeveer 11 jaar ago | 1 answer | 0

1

answer

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?

meer dan 11 jaar ago | 1 answer | 0

1

answer

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, ...

meer dan 11 jaar ago | 1 answer | 0

1

answer

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 ...

meer dan 11 jaar ago | 1 answer | 0

1

answer

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?

bijna 12 jaar ago | 3 answers | 0

3

answers

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

ongeveer 12 jaar 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...

ongeveer 12 jaar ago | 2 answers | 1

2

answers

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

ongeveer 12 jaar 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...

ongeveer 12 jaar ago | 3 answers | 0

3

answers

Question


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

ongeveer 12 jaar ago | 3 answers | 0

3

answers

Answered
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'); ...

ongeveer 12 jaar 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')

ongeveer 12 jaar ago | 2 answers | 0

2

answers

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...

ongeveer 12 jaar ago | 1 answer | 0

1

answer

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.

ongeveer 12 jaar ago | 4 answers | 1

4

answers

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...

meer dan 12 jaar ago | 1 answer | 0

1

answer

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...

meer dan 12 jaar ago | 2 answers | 0

2

answers

Answered
View a surface plot from the top
starting with a value lower than zero for the y-axis fixed it. axis([0 1000 -0.001 110 0 110]) view(0,90) With this...

meer dan 12 jaar ago | 3

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