Axel Vogt

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17 years, 226 days
Munich, Germany

MaplePrimes Activity


These are replies submitted by Axel Vogt

@CR 

Excel only displays you some date format, but actually uses floats.

Find attached a decomposition into year, month etc and the import to Maple. I did that using my country settings = Germany

Example_229991.xls
MP_229991.mws

Added: And your large file has an encoding error, the first entry is not the name "Data", it is "Data" so it is likely an error by generating that csv and Maple can not interprete that field name

@Carl Love therefore I would call it a respectable bug

@CR , you screenshots indicate that you may have a formatting problem for the name of the field "data" = date in your large file.

Why dont you just import as Excel file and convert to another type like a DataFrame later on?

Anyway your time stamps in the field "data" as string will possibly help you not much in Maple.

A common way is: split in year month day and parts of a day on the source, here it is Excel and it has functions for that (NB: internally Excel on a sheet just uses floats and only a 'mask' displays it as date)

Int(Dirac(sin(x)),x=-1..1); value(%); returns unevaluated as well (Maple 2020)

The file seems to be too large for the amount of data (and contains formulas as well). I saved it again using Libre Office, now it is 500 KB instead of 12 MB. May be you try again with that. Also you may check whether the versions of Maple and Excel are valid as pairing.

Subset_test1.zip

Edited: for me then it works (no need to change country settings) using Maple 2020 with Standard Interface

with(ExcelTools);
Q:=Import("d:\\temp\\Subset_test1.xlsx"); # giving a 1300 x 90 Matrix

You may have to convert the date format, have not looked for you formula fields

Just a thought: if you work with Windows settings for Italy (?) then time format and floating point numbers are not what Maple is expecting. You may (temporarily) change to US for your Windows (or process data through editing which is a little pain).

I have not tested it for your case.

I do not think that does make sense, look at the graphics at https://en.wikipedia.org/wiki/History_of_the_Internet#Rise_of_the_global_Internet_(late_1980s/early_1990s_onward) which is for hosts, not users. Hence I guess it is a "S-shaped" curve and in logarithmic scaling it may have a chance to be roughly quadratic "at current end". And you may wish to have some (guessed) data, of course.

And in the ghist of mmcdara

Fac:= n -> mul( i, i = 1 .. n ); # https://rosettacode.org/wiki/Factorial#Maple

Fac(5)=5!;
                              120 = 120

 

 

@mmcdara Thank you, but it's Maple's solution :-) Unfortunatly quite hidden, I just remembered that I once used it

For your question: sorry, I do not know an answer for that.

@Carl Love I have tried for all divisors k of 2^2*5^2 (so 2^k sides), only k=4 formally rejects. Thus the interpretation through dices fails, at least the samples are too small.

@Carl Love , thank you for addressing that issue - then the test is almost useless here, sigh

sigh            ...

@vv I think it is beta, not Pi/2 - beta (take beta=Pi/8 as example), no?

Do both systems use the same definition for JacobiSN ?

@vv but how to explain the minus sign?

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