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| Hello Kay. Thanks for your comment. No, the initial condition z(0)=0 is not a problem because initially the first derivative tends to infinity; that's compatible with the physical problem. The way I by-passed z(0)=0 is to consider z(0) ~ $10^{-15}$. ... |
| Hi Frank Sorry, but I have noticed that the name given to the data set was 'Xdat' instead 'Xdata' used in other places of the code. Its a mistake. Thanks Javier |