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 May9 comment Least Square Fitting @AlexeiBoulbitch I usually write an answer in the comment if it can be expressed as one sentence. Anyway, thanks for your suggestion! May7 comment Least Square Fitting Using Solve is an easy way: Solve[Log[y]==(*your answer from A*)/.x->Log[u],y] Apr10 comment A question about two ways to use Default Thanks for your help! Apr10 accepted A question about two ways to use Default Apr10 comment How to solve correctly inside a DO loop and then plot There are some warnings when solving your equation in the Do loop. You'd better correct the code. By the way, the solutions to your equations contains complex numbers, so the condition -1.01 < x < 1.01 might give you the void set. Apr10 awarded Yearling Apr10 asked A question about two ways to use Default Mar11 comment Are there some other ways to solve a second PDE except DSolve? @Nasser Thank you! Mar11 comment Are there some other ways to solve a second PDE except DSolve? @xzczd Thanks for this information. I'll try it again. Mar11 asked Are there some other ways to solve a second PDE except DSolve? Feb17 comment “Save Graphic As…” does not include plot legends Actually, you can use Export command to export your result as a picture such that Export["test.jpg",(*your result*)]. By this way the legend is included. Feb17 comment Convert number to exponent form with highest power possible @NLCJ In @Rojo 's comment, exp=GCD @@ FactorInteger[n][[All,2]] is exp=Apply[GCD,FactorInteger[n][[All,2]]]. This may be make it clearer. Feb14 answered Assigning symbolic operators to built-in functions Jan20 comment Count the number of sqrt and 4th powers in a function As suggested by @b.gatessucks,you should check the FullForm of this expression first. Besides, patterns of specified types includes _Integer,_Real,_Complex,_List,_Symbol and the general _head, where head is returned by Head. So there is no _Sqrt but _Power,because Head[Sqrt[x]] returns Power. Jan14 awarded Critic Jul25 awarded Scholar Jul25 accepted How to group lists that own one common element? Jul17 comment Conditioning on group of functions @Amin That's right, but you have to declare the option Se before Bigin["Private"] in the form of Options[AbEst]={Se->False}, since you can't modify the variables in the context Private. If so, the definition of the function should be AbEst[b0_, u0_, method_, opts___?OptionQ] :=Module[{...,op=Se/.{opts}/.Options[AbEst]},...]. Jul17 comment How to group lists that own one common element? Thank you! Gather is more general and flexible than GatherBy. Jul17 comment How to group lists that own one common element? Thanks very much! It is what I want. In fact, I don't need to get those sub-lists like {9,7}.