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Is there a way to smooth irregularly sampled data (e.g., data={{1,3},{4,6},{5,7},{6,3},{8,1},{9,4},{13,2}}) using in-built functions?
Read this tutorial. It contains big monograph how to fix problem with inconsistent conditions. After solving this problem, maybe, there will not be other problems. If there are problems after that, write here....
Time for diffusion in example just 300000000 sec or about 10 years. It is extremly small for diffusion in munerals. If you increase time up to 100 000 000 000 sec or 3000 years, you will see the result. In the most geological problem diffusion run...