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Aug
5
revised How get eigenvectors without phase jump?
Added Bloch sphere
Aug
5
comment How get eigenvectors without phase jump?
@xslittlegrass Sure, that's one of the infinitely many alternative conditions one could require. What I did was just a choice I thought appropriate for the particular problem at hand. For eigenvectors in two-dimensional complex vector spaces one also often uses the Poincaré (or Bloch) sphere.
Aug
4
comment How to make Eigensystem in version 10 produce the same results as version 9
@acl Right - your answer to the other question (which got closed) could perhaps be combined with mine to give a canonical answer. If xslittlegrass rephrases the question to be more general maybe it could remain open to serve that purpose... (sorry I have to leave right now...)
Aug
4
reviewed Close How does Mathematica identify outliers?
Aug
4
reviewed Close How to make Eigensystem in version 10 produce the same results as version 9
Aug
4
reviewed Close Negative number modular positive number ?
Aug
3
comment Finding unit tangent, normal, and binormal vectors for a given r(t)
@murray But on the other hand, once you understand the procedure, I think you'd want a convenient way to access it - and therefore having it available in canned form is good, instead of making your own library.
Aug
3
awarded  Nice Answer
Aug
2
revised Quick Hessian matrix and gradient calculation?
generalization to n-th order
Aug
2
comment Higher derivative
Please use correct Mathematica syntax and be more specific as to the form of the result you expect. Also look at Quick Hessian matrix and gradient calculation - this may be a duplicate.
Aug
2
answered Substituting values in 3j symbols
Aug
2
comment Substituting values in 3j symbols
Although this is true, I don't think that it explains the incorrect behavior.
Aug
2
comment Substituting values in 3j symbols
The same incorrect result also happens when I replace ThreeJSymbol with ClebschGoradan in the first line.
Jul
29
reviewed Close Result of Integrate depends on order of integration although the domain is rectangular
Jul
29
reviewed Close Change the size of a graphic inside a legend
Jul
29
answered Integrating Mathematica in Blackboard
Jul
29
comment Integrating Mathematica in Blackboard
I think currently Blackboard doesn't allow you to access external URLS for JavaScript and CSS from within HTML files that you upload. This means you will have to try and download all the remote files needed by the CDF plugin embed script, and put them into a directory together with the CDF file and the HTML file that contains the embed code. Then you could try to zip that whole directory and upload it to Blackboards under "Files > upload ZIP file...". I haven't actually tried it because I don't really have much use for CDF files anyway...
Jul
27
comment Can NDSolve handle discountinuos data?
I think this is a regression: your code produces the expected answer with no problem in Mathematica version 8.
Jul
26
comment How can I mend this broken heart?
(+1) To make it work in version 8, I defined CubeRoot[x_] := (Abs[x]^(1/3) Sign[x]).
Jul
25
comment Result of Integrate depends on order of integration although the domain is rectangular
@MichaelE2 I agree, and I think version 10 should recognize the divergence more quickly, as is the case in version 8 (and apparently in 9). Maybe it gets stuck in trying to combine some ConditionalExpressions. Don't have time to investigate right now...