# Lisa Justin

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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...

mer än 4 år ago | 3 answers | 0

### 3

answersQuestion

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....

ungefär 10 år ago | 1 answer | 0

### 1

answerwhich 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...

ungefär 10 år 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...

ungefär 10 år 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...

ungefär 10 år 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/$...

ungefär 10 år 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...

ungefär 10 år 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...

ungefär 10 år 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')

ungefär 10 år 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...

ungefär 10 år ago | 0

The difference between the amplitudes of Fourier transform and wavelet transform

It depends on the window function used.

ungefär 10 år ago | 0

How do I compute the mean square value of a function

mean square value=mean(y.^2)

ungefär 10 år 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...

mer än 10 år ago | 2 answers | 0

### 2

answersQuestion

How can I compute Kurtosis

How is Kurtosis computed in matlab?

nästan 11 år ago | 1 answer | 0

### 1

answerQuestion

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?

nästan 11 år ago | 1 answer | 0

### 1

answerQuestion

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, ...

mer än 11 år ago | 1 answer | 0

### 1

answerQuestion

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 ...

mer än 11 år ago | 1 answer | 0

### 1

answerQuestion

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?

mer än 11 år ago | 3 answers | 0

### 3

answersHow to generate a signal with time varying frequency?

Use wavelet transform or Short time fourier transform. I prefer wavelet tranform for nonstationary signals

mer än 11 år 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...

mer än 11 år ago | 2 answers | 1

### 2

answersCSV vs MAT files

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

mer än 11 år 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...

mer än 11 år ago | 3 answers | 0

### 3

answersQuestion

saving a csv file as a .mat file

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

mer än 11 år ago | 3 answers | 0

### 3

answersImport 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'); ...

mer än 11 år 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')

mer än 11 år ago | 2 answers | 0

### 2

answersQuestion

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...

nästan 12 år ago | 1 answer | 0

### 1

answerQuestion

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.

nästan 12 år ago | 4 answers | 1

### 4

answersQuestion

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...

nästan 12 år ago | 1 answer | 0

### 1

answerQuestion

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...

nästan 12 år ago | 2 answers | 0

### 2

answersView 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...

nästan 12 år ago | 3

| accepted