How to take first derivative and plot

Question

Kanakaiah Jakkula 2017-11-16

0
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https://ww2.mathworks.cn/matlabcentral/answers/367417-how-to-take-first-derivative-and-plot

回答： Bernhard Suhm 2017-12-15

Hi,

I have the time series data as below:

23  3.45  0.17
45  5.67  0.25 
34  4.67  0.28
46  5.76  0.30
23  5.76  0.34
41  5.98  0.44
44  6.32  0.45
47  6.66  0.52
56  6.51  0.57
67  7.04  0.62
78  7.43  0.65
69  7.87  0.68
65  7.56  0.68
43  8.78  0.69
45  8.77  0.72
47  9.56  0.78

Because data in three columns are in different scales, hence I want to normalize to bring them in to same scale(0~1), and then take first derivative (due the change is very small, the abosolute data graph may not be so clear to show the change), and then plot on the same graph.

please some one help, many thanks in advance,

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Answer 1

Bernhard Suhm 2017-12-15

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https://ww2.mathworks.cn/matlabcentral/answers/367417-how-to-take-first-derivative-and-plot#answer_296354

You can use zscore to normalize, then diff to compute the differences, and then plot original and differences on the same plot (using "hold on" to plot both). Does this solve your problem?