Replace repeatative values by using interpolation ?

Question

Koustubh Shirke 2020-3-14

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https://ww2.mathworks.cn/matlabcentral/answers/510846-replace-repeatative-values-by-using-interpolation

评论： Ameer Hamza 2020-3-14

Hi Matlabers ,

I have a vector which has repeatative values from 0 to 1.

I want to relace those repeataive values by using interpolated values in matlab script. As a result, I will have no any repeatative value and the plot/ and curve of that vector will be smooth.

Thanks in advance.

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Answer 1

Ameer Hamza 2020-3-14

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https://ww2.mathworks.cn/matlabcentral/answers/510846-replace-repeatative-values-by-using-interpolation#answer_420112

在 MATLAB Online 中打开

Try this

x = [0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 1 1 1 1 1]'; % generate random data
indexes = [1; find(x(2:end) - x(1:end-1))+1];
x_new = zeros(size(x));
for i=1:numel(indexes)-2
    x_new(indexes(i):indexes(i+1)) = interp1([0 1], x(indexes([i i+1])), linspace(0, 1, indexes(i+1)-indexes(i)+1));
end
x_new(indexes(end-1):end) = interp1([0 1], x([indexes(end-1) end]), linspace(0, 1, numel(x)-indexes(end-1)+1));

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Koustubh Shirke 2020-3-14

Hi Ameer,

Thanks for the answe. Its really helpfu.

It seems , it keeps first value of start of any duplicate. Can I also shift it to centre ? So that I will keep all centred value of duplictaes and then interploate remained ?

Ameer Hamza 2020-3-14

在 MATLAB Online 中打开

try something like this

x = [0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 1 1 1 1 1 0 0 0 0 0 0]'; % generate random data
indexes = find(x(2:end) - x(1:end-1))+1;
indexes = floor(movmean(indexes, 2, 'Endpoints', 'discard'));
x_new = zeros(size(x));
x_new(1:indexes(1)) = interp1([0 1], x([1 indexes(1)]), linspace(0, 1, indexes(1)));
for i=1:numel(indexes)-1
    x_new(indexes(i):indexes(i+1)) = interp1([0 1], x(indexes([i i+1])), linspace(0, 1, indexes(i+1)-indexes(i)+1));
end
x_new(indexes(end):end) = interp1([0 1], x([indexes(end) end]), linspace(0, 1, numel(x)-indexes(end)+1));