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| Thanks! Still I have this warning: "NDSolve::ndnum: Encountered non-numerical value for a derivative at \[Xi] == -1.." . Do you know if there is something wrong with some definitions I made, or something that tells to the NDSolve command to evaluate... |
| Hi Hans, actually it is not a typo! That apostrophe indicates a derivative of the function ((u’[x])/dsdx), that is ((u’[x])/dsdx)‘. Maybe is it written in the wrong form? |