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Moderator of Mathematica.SE and Celtic goddess.

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Oct
18
comment Invert Colors Stylesheet White on Black
Is your question how to change the colors of the notebook font and background? What is your criterion for success? Are you looking for a more elegant solution than what you have? PS: Strongly related: mathematica.stackexchange.com/questions/1389/…
Oct
17
comment the way to save multidimensional array in text file
Answer to your subquestion: Mathematica is case-sensitive so cos is not the same as Cos. Please do familiarise yourself with the the basic tutorials in the documentation, as this will save you and other site members a lot of time.
Oct
12
comment Optimum number of cog teeth for two step helical gearbox
Is this a question about the software Mathematica? It looks like you might have intended to post this at our sister site, math.SE
Oct
3
comment Check whether a function of two variables is a probabilty distribution function
Hello xmpirate! It is not clear that your question is about using the Mathematica software. Please indicate what you have tried, including any code that is not working for you. Belisarius has given an example in his answer, but perhaps your question is about something else. It is not very clear.
Oct
2
comment Avoiding zero (empty set) solution with NDSolve
Dale, I think you have an unregistered account and a registered one (djw238). On the assumption that you want to collect all your reputation in one place, please use the contact us link to request an account merge.
Oct
1
comment How can I manipulate TemporalData?
@IstvánZachar - nice, thanks! I hadn't had time to delve further into those bits.
Sep
25
comment Is there any good way to find and/or plot numerical integrals of non-continuous functions like Tan[x]?
@Brendan since you feel no answer is possible, I've closed the question as too broad. If you want to try a narrower question, please edit it and it can be reopened.
Sep
21
comment johansen test error in code
Yes, and I already knew about the error from the Wolfram community forum. I haven't looked at this code for about 15 years. Due to work and family commitments, I'm not going to get around to fixing it for a while.
Sep
19
comment Transcendental equation Non-linear how to solve
Dear @user7096 - if you want to improve your question, please edit it using the "edit" link at the bottom of the question.
Sep
19
comment Taking a percentage of data from a list or a table
Top and bottom X% by length or by value? Consider TrimmedMean if that is what you are intending to calculate.
Sep
19
comment Taking a percentage of data from a list or a table
What if the rounded value Round[LengthofData*StartPercentage, 1] is 0? I think you need a few extra checks in here. I also don't think you need the final parameter - just let the function get the Length of the data directly. Otherwise you could have a last parameter that is not compatible with the data.
Sep
19
comment Autoregressive distributed lag model
If you mean distributed lags of exogenous variables, then you need to respecify the FoldList approach to have more than one element in each iterate of the list in the last argument.
Sep
18
comment Simplify vector expression - is there something like “Factor” for vectors, dot products etc.?
Dear physicslol, welcome to Mathematica.SE! Please don't post comments as answers, as it works against the Q&A and model of the site and can be unhelpful for future visitors. I've turned your answer into a proper comment.
Sep
18
comment Autoregressive distributed lag model
Please also see the "Related" questions shown in the sidebar to this question, particularly this one
Sep
17
comment Double series over primes
All, given the divided views on whether the question should be closed, I propose to give it the benefit of the doubt and leave it open. If a question has this many upvoted answers, it deserves to be left open.
Sep
17
comment Double series over primes
Chris' sis, whoever it was would like you to provide more details and ideally some Mathematica code.
Sep
17
comment Roads network visualization by thickness and color intensity by population from GIS files
Alex, this is an interesting question but it would help if you posted what you tried and where you got stuck.
Sep
11
comment How to capitalize the first letter of each word in a string
This isn't a separate answer, but it's worth knowing that "Title case" usually does not capitalize certain small words, so you'd do something like: replacelittlewords = z : (StartOfString | WhitespaceCharacter ~~ # ~~ WhitespaceCharacter) :> ToLowerCase[z] & /@ {"A", "An", "The", "Is", "On", "To"} and then StringReplace[ StringReplace["This is a test about which you will be amazed", z : (StartOfString | WhitespaceCharacter ~~ _) :> ToUpperCase[z]], replacelittlewords].
Sep
10
comment Relational joining of tables
@IanSchumacher - on the contrary - it is just that there are plenty of cases where people versed in other languages would reach for a loop, but vectorised or pattern-matching operations would be more efficient. See this question.
Sep
10
comment Relational joining of tables
Well, the question was written in terms of things with matching id's, so please forgive me that it was not clear to me that you had something more general in mind. But different criteria would suggest a different approach, including your Outer one.