How to unwrap a signal?

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Lizan 2016-2-4

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https://ww2.mathworks.cn/matlabcentral/answers/266699-how-to-unwrap-a-signal

编辑： Walter Roberson 2016-2-4

p4.mat

I like to unwrap this vector, I calculated with a cos-function to obtain a nice dip.

The figure looks like this:

I would like to obtain this (see the orange line),

Attaching the vector as .mat

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Lizan 2016-2-4

编辑：Lizan 2016-2-4

在 MATLAB Online 中打开

I had a code like this:

signal = p4;
t2 = 1:1:length(p4);
peakValue = max(signal);
index1 = find(signal > (peakValue - 0.001), 1, 'first');
index2 = find(signal > (peakValue - 0.001), 1, 'last');
signal(index1:index2) = 2 * peakValue - signal(index1:index2);
signal(index1:index2) = signal(index1:index2);