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2d
comment A bug in Integrate
@Vaclav I noticed that most of your posts here are bug reports. Please do not do this. This site is for questions only. If you wish to report bugs, contact Wolfram directly. Wolfram will not see bugs reported here. If you only report here, they won't get fixed. This site is not affiliated with Wolfram.
2d
comment Parsing a CSV file using Interpreter
@Taliesin Thank you!!! This is great!
2d
revised make trace of a matrix listable?
deleted 39 characters in body
2d
answered make trace of a matrix listable?
2d
comment FullSimplify cascades too much/groups variables too eagerly
Take a look at ComplexityFunction to understand why Simplify does this.
2d
revised FullSimplify cascades too much/groups variables too eagerly
edited tags
2d
awarded  Notable Question
May
21
comment Parsing a CSV file using Interpreter
Because of problems like this one (and this) I am actually getting quite a bit of real pressure to use R instead. It's very hard to explain to the decision-makers why I would need to use a very expensive piece of software like Mathematica when R is free and can import data quickly and accurately, especially when I had to correct my results the next day as I discovered that Mathematica imported some data incorrectly. I really hope WRI will give higher priority to practical user needs.
May
21
comment Parsing a CSV file using Interpreter
I was trying to use SemanticImport for this sort of data in 10.1.0, but it is literally unusably slow when specifying column types explicitly. This takes 27 seconds on my computer: SemanticImportString[ExportString[RandomReal[10, {5000, 5}], "Table"], {Real, Real, Real,Real, Real}]; Is there going to be a fix for this?
May
20
comment Encourage SemanticImport to assume numbers?
I ran into this problem too. Unfortunately specifying data types makes import ridiculously slow.
May
20
comment Simple way to concatenate Dataset columns
@Mr.Wizard No, but I will.
May
20
comment Simple way to concatenate Dataset columns
@Mr.Wizard No, keep it.
May
19
comment Simple way to concatenate Dataset columns
So I didn't overlook anything then, and this is really the shortest way. I'll just make a function for it. This problem came up when processing a dataset in two different ways, ending up with two datasets of compatible shapes but different contents (columns). It is often inconvenient and sometimes very cumbersome to redo the calculations in a way that produces a single dataset in one go. It's simpler to just continue using what I have and combine them to a single dataset.
May
19
revised Question about TransitiveReductionGraph
edited tags
May
19
comment Question about TransitiveReductionGraph
I think it's a bug.
May
19
comment Color edges of a multigraph when there are parallel edges using Graph[] and EdgeStyle
Overall this is a pretty big issue: it doesn't only affect styling. It also affects all properties that can be attached to edges. Due to the special nature of multigraphs, I'd assume that if anyone actually does need multigraphs, they likely also need properties. So this problem is serious enough that it makes the new multigraph functionality near-useless. If you agree that this is a bug, could you please file a bug report?
May
19
comment Color edges of a multigraph when there are parallel edges using Graph[] and EdgeStyle
I would consider this problem a bug. The fact that EdgeStyle simply doesn't support differentiating between the edges could be called bad design (or design without foresight). But there's an alternative notation: Graph[{Style[1->2, Red], Style[1->2, Blue]}]. This notation does support separate styling, yet it's not handled correctly.
May
19
revised Simple way to concatenate Dataset columns
added 22 characters in body; edited title
May
19
revised Simple way to concatenate Dataset columns
added 104 characters in body
May
19
asked Simple way to concatenate Dataset columns