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	504 reputation	bio	website	bsl-support.de	visits	member for	1 year, 2 months
110 badges		location	Germany		seen	13 hours ago

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May 19	comment	Why don't these styling rules work when viewed in TableForm? As a matter of taste I would rewrite the replacement rule as `m /. l_List /; Last[l] > 0 :> ...` . This formulation already hints at what is the problem with `Style` being applied to a list.
Nov 13	comment	BUGS-type calculations in Mathematica This is a notebook from the 2007 Wolfram Technology Conference demonstrating many Bayesian statistical procedures.
Jun 22	comment	How to Set parts of indexed lists? +1 Great job, thank you Rojo. I must admit as somewhat 'intermediate' user I certainly will need a bit of time to thoroughly understand the solutions offered by Leonid and you.
Jun 22	comment	How to Set parts of indexed lists? Testing this runs as fast as direct assignment for a non-indexed var. Does this solution have the same memory disadvantages as ReplacePart does? (the indexed-var needs to be copied and reassigned)
Jun 22	comment	How to Set parts of indexed lists? Leonid, what a solution, thank you. I had believed there is some 'easy' way - possibly upvalues - but your answer shows how deep the matter runs.
Jun 22	comment	How to Set parts of indexed lists? As I had written to Szabolcs the reason for choosing an index was the more simple way to change existing code. But the SparseArray is simply the list-solution with better allocation of resources in case of lots of empty cells? I can't see how this is a replacement for an indexed var which essentially allows dynamic programming?
Jun 22	comment	How to Set parts of indexed lists? @jVincent, thank you for expanding your answer and it does help to clear the issue. Nevertheless it is a 'pity' that even the subscripted variable cannot be addressed by Part and Set. Essentially then you cannot have a truly indexed symbol?
Jun 22	comment	How to Set parts of indexed lists? The reasons for using indexed variables as opposed to lists is addressed in the Mathematica reference (reference.wolfram.com/mathematica/tutorial/…). Why should these reasons - sparse definitions made only when needed - not apply when the variable contains an array?
Jun 22	comment	Using a built-in symbol as a variable Input and Output are different matters as far as I know. You might and should use defintions starting with a lowercase letter to be on the safe side regarding conflicts but that does not hinder you to format any output like you want it to appear?
Jun 22	comment	How to Set parts of indexed lists? Szabolcs, I am just trying to have an indexed variable be a list or to be more precise an array. While in principle you are right that I might transfer every index to a numerical range and thus one could come around by simply adding the index-dimension to the arrray dimension, there is good reason to work with the 'sparse' definitions allowed by using an index for the variable itself. My problem at hand is that I am changing code already written. Adding the index in the variable name is a simple replacement. Adding it as an array dimension means a lot of work...
Jun 22	comment	How to Set parts of indexed lists? Just to make this clearer, I have edited the original question in order to make it clearer by having the index be a symbol.
Jun 22	comment	How to Set parts of indexed lists? Szabolcs, as written below, I am a bit amazed at what seems 'illogical' in not being able to address downvalues. I might have to use the list-option as you suggest, but for a more symbolic reference like matM[a] it would be very nice to do it the way I suggested. I should be possible, shouldn't it?
Jun 22	comment	How to Set parts of indexed lists? Thanks. But using the 'fixed' argument in a function is explicitly suggested in the Mathematica documentation (reference.wolfram.com/mathematica/tutorial/…) and for example in Sal Mangano's "Mathematica Cookbook". It is of course possible to make this an array adding the index dimension, but if - as in my real case - you want to use symbols like matM[a] is not so easy to do.
May 23	comment	How can you use and convert Gauss-Krüger-Coordinates in Mathematica? Another observation is that it seems people at Wolfram Research have gotten the axes wrong. In geodesy as far as I have learned from web-research the x-axis should point north and the y-axis should point east. Have they missed that?
May 22	comment	How can you use and convert Gauss-Krüger-Coordinates in Mathematica? As a side note: For some reason Mathematica seems not to be able to convert the gaussKruegerPosition into a WGS84-Position. GeoPosition[ gaussKruegerPosition[{3513495, 5405227}, 9, 500000], "WGS84"] returns the error "GeoPosition::invdtm:Unknown geodetic datum "WGS84". Use GeodesyData["Datum"] for a list of available named datums." This is strange as "WGS84" is of course explicitly listed under GeodesyData[] and accepted for GeoPositions. A bug?
May 22	comment	How can you use and convert Gauss-Krüger-Coordinates in Mathematica? For more information on coordinate reference systems and conversions one might turn to epsg.org where guidance on conversions and formulas is given under epsg.org/guides/G7-2.html.
May 1	comment	Is there a bug in Pick? Thank you, Markus, but I wanted to explicitedly make a difference between a Null-entry as in a sparse array and a numerical Value of 0. That is why I used =!= instead of !=.
May 1	comment	Is there a bug in Pick? @Szabolcs I do find confusing that Cases will work with the pattern not having to use the ?NumericQ test. So it is really the levelspec that is misleading. How good that Mathematica is an interpreted language ;-)
May 1	comment	Is there a bug in Pick? Thank Szabolcs. One has to be really careful with the patterns as of course - thinking about it - everything is totally logical as elem_ matches a list in toto. I forgot to put in a Filter as you suggested. One might wish for a levelspec, but then you should probably turn to Cases anyway.
Apr 18	comment	How can I connect to a database using the 32 Bit ODBC on a Windows 7 (64 Bit) machine? In[160]:= conn = OpenSQLConnection[JDBC["odbc", "accessDatabase"]] (* where "accessDatabase" is a 32bit DSN *) During evaluation of In[160]:= JDBC::error: [Microsoft][ODBC Driver Manager] Der angegebene DSN weist eine nicht übereinstimmende Architektur von Treiber und Anwendung auf.>> (Translation: DSN does not have a compatible architecture with regard to the driver.) This is to reproduce the error; for further comments please refer to the Answer 1 where I have commented also. Thanks.