How to normalize time periods

Hinde essmahi BOUZIANE 님이 질문을 제출함. 20 Jun 2019

최근 활동 Aravind Ravikumar 님이 댓글을 추가함. 20 Jun 2019

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I am very new to matlab and I don't know how to code this problem.I have two arrays: Debut and End. Each array contains doubles that indicates the start(Debut) or the end(End) of a certain period.I am doing some signal processing so I want all these periods be normalised. I am thinking of calculating the mean of all periods and then normalize each period to that mean ? or do you have any other ideas ?

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Aravind Ravikumar 님의 답변 20 Jun 2019

Aravind Ravikumar 님이 편집함. 20 Jun 2019

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MATLAB has a normalize function, you can view the documentation here. From your description of your problem, you can first calculate the mean of the arrays Debut and End element-wise and then use normalize() on the resultant array. For example, the following code does somewhat similar to what you want:

x = rand(1,10);
y = rand(1,10);
avg = (x+y)/2;
norm_avg = normalize(avg);

where x,y are 2 arrays, avg is the element-wise average of x,y and norm_avg is the result after using normalize() on avg.

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Aravind Ravikumar 20 Jun 2019

How about finding the difference between Debut, Fin first, then dividing the resultant by max(resultant). For example,

x = rand(1,10);
y = rand(1,10);
diff = y-x;
res = diff ./ max(diff)

This should not produce any negative output because before normalizing every element is positive.

Hinde essmahi BOUZIANE 20 Jun 2019

I tought about too that but i need to use each element of the array in an other function ' arguments.

Aravind Ravikumar 20 Jun 2019

You could keep normalized values of each array separately in some other array, and to calculate normalized value of the difference you can use the original array.

x = rand(1,10);
y = rand(1,10);
diff = y-x;
res_nor = diff ./ max(diff)
x_nor = x ./ max(x)
y_nor = y ./ max(y)

Maybe something like the above code.

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Akshay Malav 님의 답변 20 Jun 2019

Hi , there is a inbuilt function in matlab to normalize the data . Look at the link mentioned below .

The function is V = normalize(A)

V will contain the normalized value of the array A

https://www.mathworks.com/help/matlab/ref/double.normalize.html;jsessionid=40f8cb1df7d5db4996e9c83a4cce

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Hinde essmahi BOUZIANE 20 Jun 2019

s 'normalize' defined for input arguments of type 'double'?

Akshay Malav 20 Jun 2019

Yes it is defined for double also

Akshay Malav 20 Jun 2019

Ans also adding to above answer the normalize function ignores NaN values if it is present in your array

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