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# Yihan Ma

##### Last seen: 4 months ago
10 total contributions since 2019

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Question

How to extract boundary of binary image in a fixed sequence ?
If I have a binary image like this, how to extract boundary in a certain order. For instance, I can extract boundary from left t...

1 year ago | 0 answers | 0

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Question

How to change time interval value when using instfreq function in Matlab ?
When I want to use instfreq function to acquire average frequency versus time, eg. [frequency, time]=instfreq(signal,fs); h...

1 year ago | 1 answer | 0

### 1

Question

How to extract curve data from such a JPEG image?
When I use a machine to record the ECG data, it can only save as .jpg format, just like the figure I show in the below. But I w...

1 year ago | 1 answer | 0

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Question

How to using Linear Discriminant Analysis for classify training and testing dataset?
I have a little confused about using Linear Discriminant Analysis (LDA) algorithm for classification after reading some articles...

1 year ago | 0 answers | 0

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Question

How to run Augsburg Biosignal Toolbox of ECG signal processing?
When I run Augsburg Biosignal Toolbox to extract ECG signal, it stopped before processing the data, but EMG signal processing is...

1 year ago | 2 answers | 0

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Question

How to get the spectral coherence function in this formula at MATLAB?
The figure in below is the formula to calculate the spectral coherence function (3), I could use other guys code to calculate...

2 years ago | 0 answers | 0

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Question

How to calculate the skewness and kurtosis from MATLAB gaussian mixture model function---fitgmdist ?
If I have a 1 dimension sequence, I could use the fitgmdist function to extract the means and sigmas of several distribution fro...

2 years ago | 1 answer | 0

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Question

Why the result of GMM(Gaussian mixture model) is not the same for twice calculation?
When I try to use GMM to fitting a 1000 by 1 array, the result of GMM is totally different for twice simluation. When I try t...

2 years ago | 1 answer | 0

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How to draw this 2 dimension figure (antenna feature) in Matlab?
Hello,ANKUR KUMAR Thanks for your reply, the attachment is the database, one is .txt format, one is .mat format. I don't ha...

2 years ago | 0

Question

How to draw this 2 dimension figure (antenna feature) in Matlab?
In this paper “RF-DNA” Fingerprinting for Antenna Classification, Figure 2 is a 2-Dimension figure, but I am confused by this fi...

2 years ago | 2 answers | 0