Some normalization issues.

While shaping out code for the pilot data set analysis I've figured out browsing motifs and plots that normalization to the zero mean and unit of energy failed to produce "proper" results in the next two cases:
[1] when only single value in the sub-series
[2] when all values are the same, i.e. deviation = 0
which subsequently lead to some weird patterns.

Fixed!

Also still a bit confused by appearance of some "interesting" motifs like here:


The raw values look a bit unaligned to me, last symbol of motif is "c" for both, but this "c" in the red trajectory is less than "a" on blue. But I guess it's all about scale.