xzczd

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	1,127 reputation	bio	website		visits	member for	10 months
312 badges		location	China		seen	10 hours ago

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May 18	comment	Solve this equation symbolically Well, I don't think the order of the equation can be reduced by `Factor`, unless we have a special `a`.
May 18	comment	Solve this equation symbolically Er… So what result do you want? The order of the equation is so high that `Solve` can only give an symbolic solution in that form, and I don't think it can be changed by other approaches.
May 18	comment	Solve this equation symbolically If you just want to solve equations symbolically, why not use `Solve` ?
May 14	comment	Variable naming changes everything It seems that only variables that begin with `a` `c` `d` `e` will work (something like `aaa` is also OK)… very strange!
May 13	comment	How to collect/reduce with respect to multiple variables? +1 for the first one, which can avoid possible duplication of the name of the variables.
May 13	comment	How to collect/reduce with respect to multiple variables? But the first two solutions won't work if the equation is something like `a - d == b + c - e`.
May 12	comment	Simple problem with Manipulate and Plot This is explained in the Possible Issues of the document of `Manipulate`: Manipulate only "notices" explicit visible parameters. You can check the document for more information: reference.wolfram.com/mathematica/ref/Manipulate.en.html
May 11	comment	How to draw some 2D curves in a 3D plot? In fact a more general question behind this is how to make a waterfall plot. I found some discussions here
May 7	comment	ODE and BVP: NDSolve errors @Petrus Just as a tool for method of exhaustion… Of course some observations for the plots of the solutions are also needed to narrow the range of exhaustion.
May 6	comment	ODE and BVP: NDSolve errors It's not surprising that the original initial condition becomes improper when the domain is changed, I guess the key point for solving your problem is to find a proper initial condition, which requires a lot of patience.
May 6	comment	ODE and BVP: NDSolve errors @Petrus See my edit.
May 6	comment	ODE and BVP: NDSolve errors I found that question: mathematica.stackexchange.com/questions/18301/… , though it now appears that it's not so applicable to your problem, I think you can still refer to it.
May 5	comment	ODE and BVP: NDSolve errors @Petrus I found the initial condition above by trial and error… I think it's part of the property of shooting method… sorry I can't give a deeper explain, but now I notice that maybe my answer can be better, I may improve it tomorrow.
May 5	comment	ODE and BVP: NDSolve errors @I think it's better to add this to your question rather than post it as an answer… I recall a excellent answer by someone in this site to solve the problem here, but I'd like to go to bed now, you can look for it by yourself if you don't want to wait :), it's also a question about shooting method.
May 5	comment	Automatically evaluating related cells @m0nhawk Just as what István Zachar has pointed out. (At least I failed to find one 囧. )
May 3	comment	FindFit: Fit that is always lower - Change of Norm? Based on your description, I wonder if you are trying to find the envelope of a set of data? If so, you can have a look at this question.
Apr 16	comment	Solving a system of equations using subscripted variables @user6941 Everything's hard in the beginning :).
Apr 15	comment	Solve with v9 (issues with Subscript, Overscript, Superscript etc) I just want to add that, this isn't a v9 issue, it exists in my v8 too, and I think it can also be reproduced in earlier version.
Apr 14	comment	What is the correct syntax for setting up a simulation using a system of ODEs? @user6895 Try Clear["`*"] first…
Apr 12	comment	Manipulating output from Solve Well, to be honest, I can't explain this clearly, the only thing I know is that `f[H1_,H2_] := Evaluate@sol1[[1,1]]` will also work. In fact, I used to ask a similiar question(See the first two sample I gave there) but maybe that question is a little messy, so I don't get a very good answer for this part. I suggest you to post a new question if you want to get a better understanding for this.