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 Apr21 awarded Popular Question Mar24 comment Deleting one of each chosen elements in a list containing duplicates @kguler Ha! I forgot to check the docs on DeleteCases itself. Mar24 comment Wrong fit with FindFit You might want to point out what the OP was doing wrong, specifically the lack of use of the x-data such that mathematica was assuming x values... Mar24 comment Wrong fit with FindFit I'm guessing the answer is correct. YOu're not including x-values in your FindFit, so MMA assumes integers... Mar24 answered Deleting one of each chosen elements in a list containing duplicates Mar24 comment Deleting one of each chosen elements in a list containing duplicates For your little question, Flatten[{r,add}], or AppendTo[r,add] or Join[r,add] I think should all work... Mar24 answered Multidimensional Numeric Integration Mar24 comment selection based on values of other list Oops, knew I forgot something, thanks @LLlAMnYP Mar24 comment How to find out where an error occurs? See also: traceView : mathematica.stackexchange.com/questions/29339/… Mar24 comment selection based on values of other list Select[list1, MemberQ[list2,#[[1]]]] my brackets or ordering might be wrong... Mar23 comment Delete data were y = “NS” in a list with elements {x, y} See possible duplicates: mathematica.stackexchange.com/questions/2486/…, mathematica.stackexchange.com/questions/16676/… Mar23 answered Filter list based on date Mar23 answered Delete rows based on specific periods Mar23 comment Two identical expressions for ODE, two distinct result Yes, see for example this tutorial (reference.wolfram.com/mathematica/tutorial/…) or this answer (mathematica.stackexchange.com/questions/42396/…) or this (reference.wolfram.com/language/tutorial/…) Mar18 comment Two identical expressions for ODE, two distinct result Short answer: they're not distinct. You can show that they are in fact the same by replacing MMA's use of imaginary numbers and carrying through the negative. One is simply a numerical approximation (and hence probably uses different MMA algorithms) and one is exact. Mar12 awarded Good Answer Feb1 awarded Yearling Nov5 awarded Popular Question Sep30 awarded Explainer Jul2 awarded Curious