Finding periodicity of spikes, matlab

1. How do you find the periodicity of a signal in Matlab?
2. How to detect periodicity in a signal?

How do you find the periodicity of a signal in Matlab?

Load the data and plot it. Convert the temperature to degrees Celsius. Measure time in weeks. The sample rate is thus 2 measurements/hour × 24 hours/day × 7 days/week = 336 measurements/week.

How to detect periodicity in a signal?

For exact periodicity you may simply try to find given data as substring of data repeated twice. For non exact periodicity of real, noisy signal time domain and frequency domain methods may be used. Time domain one is self correlation.