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18m
comment Removing imaginary and negative results from Solve
That's not the way to do it, use Element[x, Reals] instead
28m
comment Removing imaginary and negative results from Solve
See also how-to-copy-code-from-mathematica-so-it-looks-good-on-this-site.
38m
comment Removing imaginary and negative results from Solve
That, and the OP should also not use ...&&Reals&&Positive.
42m
comment Removing imaginary and negative results from Solve
Just copy the Mathematica text (copy as input text from the Edit menu) or convert the cell to InputForm and copy, then paste it here. Try to edit it as good as possible using the Markdown tools and some community member here with the right tools will do the Greek symbols for you.
47m
comment What function generates random numbers in a compiled function?
What I sometimes do is generate a huge block of random number in Mathematica and send this (as a block) to a compiled Mathematica routine. This is quite often much faster than generating the random numbers one by one in the compiled routine.
50m
comment Multiplying three matrices does not give expected form
For a more extended discussion on column and row vectors see this.
6h
comment How to build a bvh (a motion capture file format) player in Mathematica?
@guess Good idea! I might be doing this if I can find time for it. In the mean time you might be interested in the gif I placed at the bottom of this post.
15h
comment Function to subdivide interval into n evenly-spaced points
The manual also says: "finds a list of about n "nice" numbers that divide the interval around to into equally spaced parts." The keyword here is "about".
20h
comment What's wrong with Simplify and FullSimplify?
V8 returns True, and V9 and V10 return False (Win8.1-64). IMHO the result should be neither True nor False. Looks like a bug indeed. Have you contacted support@wolfram.com?
21h
comment Examining the equations of a Differential Op Amp
You state a few contradictory things: you want r1-r3 to vary but you also want that r1=r3=Ra (same for r2 and r4). You can't have both.
21h
comment PDE with Laplacian time derivative term
I note that V10.1 solves this without a hitch. If you click on the >> at the end of the error message you get a somewhat more helpful explanation: "This input generates a message because the equations specify values for the solution on all sides of the solution region." Apparently, a situation that V9 doesn't handle and v10 does.
21h
comment PDE with Laplacian time derivative term
Hi, welcome to Mathematica.SE. The code in your second code block contained some weird characters. I've replaced them with == which seemed to be the intended operator. Please check whether this was correct.
21h
comment Examining the equations of a Differential Op Amp
Welcome to mathematica.stackexchange.com! I sincerely hope the problems in your country do not make life too miserable for you. As to your code, there are several issues: your definition of the two Gain function is missing the Blank-s (_) that should be there (see this). If you want to make plots you need all the variables/parameters/constants to have numerical values. For plotting, look up the Plot function (there are many more; please use the manual for that).
23h
comment my Mathematica has turned orange and not able to find out why
@OleksandrR. To be sure: You set the color profile using the Windows Color Management control panel to the SystemFiles\\Data\\ICC files I mentioned above, or did you do something from within Mathematica?
1d
comment How to get rid of the background tiny crosses when using Graphics?
You mean a frame around the whole figure? Use Framed in that case. Or do you mean you want a thick edge around the arrow head? EdgeForm should work but you might want to remove the filling of the polygon to see it; use FaceForm[] for that.
1d
comment OLS Estimation - Computational results vs. calculation by hand
@yvesklett no seriously, it's my iPad spelling correction (sic). It doesn't like humanum for some reason.
1d
comment OLS Estimation - Computational results vs. calculation by hand
Errare humanem est
1d
comment How to get Complement function working in a For loop?
Szabolcs is referring to missing commas after i++ and before the Print function.
1d
comment Can I rely on the ordering of the adjacency matrix?
I have the impression ( but can't check that right now) that if you provide a list of nodes as the first argument the order used will be the order of the node list.
1d
comment my Mathematica has turned orange and not able to find out why
@OleksandrR. This is actually quite comical (on second thoughts, make it tragicomical)