@Nasser @Nasser the book you mentioned is good, but was written in 1999 and reprinted in 2007. it mentions MMA, but uses an external Cylindrical Algebra decomposition package because at that time MMA coud not do it natively. In short: MMA 10 can do most/all of what is explained in the book natively.

@Nasser Could you please explain in which sense Matlab is superior to MMA in control systems? I am not familiar with Matlab capabilities, but MMA 10 control system part is pretty impressive. If you then integrate it with System Modeler, it is even nicer.

Dear all, I saw mentioned new operators @* and /* . Could someone please tell me their full names, so i can search them in doc.

@magma The are Composition and RightComposition. You can discover this by examining the output of FullForm[Hold[a@*b]].

@MarkMcClure Thank you

Integrate[2^-(n+m), {n, m} \[Element] ImplicitRegion[x >= 0 && y >= 0 && x+y <= a, {x, y}], Assumptions -> a > 0]

(* (1/(Log[2]^2))((1 - E^(-2 \[Pi])) IntegerPart[(a Log[2])/(2 \[Pi])] + 2^-a (2^a - E^(2 \[Pi] IntegerPart[(a Log[2])/(2 \[Pi])]) - a Log[2])) *)

WTF is this?

IntegerParts that is.

@WReach Thanks :)

Hi guys, I want to set a minimum absolutethickness for every line in a plot, I think the easiest way would be to generate the plot as normal and then do a replacement. I seem to recall there's a very easy way to do this, anyone know off the top of their head?

And I don't just mean the data lines: I mean the frame box, ticks, annotation lines, everything

@Guillochon The easy way that you've seen is probably Plot[Sin[x], {x, 0, 2 Pi}, Frame -> True] /. Line[x_] :> {Thickness[0.05], Line[x]} but as you can see it doesn't affect the frame or the axes or anything like that. Reason: If you look att FullForm those options aren't rendered into Line objects. The plot is rendered into Graphics, but those options are also options of Graphics, so no such rewriting is necessary.

So, AFAIK replacements can't help you here.

@Pickett I see. I mean I would expect that the final object just consists of line primatives of some sort, even if those aren't the "Line" object explicitly

10.0.1 next week!

Bogus regressions such as one above (yes, I sent a bug report) definitely create interest in getting one.

@SjoerdC.deVries Well, those were really rumours, nothing official. I really want a 10.0.1 because 10.0.0 is too buggy. I'm not expecting all bugs (even all critical bugs) to be fixed in 10.0.1. I'd rather have several point releases at regular intervals, each fixing as many bugs as was possible during that time. I.e. 10.0.1 in Aug, 10.0.2 in Oct, 10.0.3 in Dec, etc.

Just don't stop fixing bugs and consider the release done ...

v9 could have used a 9.0.2 as well.

@blochwave Where did you get the info?

hi, i'm pretty new at mathematica. i'm trying to pattern match on Piecewise[] like this: Piecewise[f:{{,},...}] or even just Piecewise[f__] but I keep getting a syntax error

am I misunderstanding something?

"The first argument f__ of Piecewise is not a list of Paris"

@Szabolcs email - my site is one of the first to receive the upgrade, apparently.

Hrm, I'm pretty confused here...ChartElementFunction doesn't seem to work for a DensityPlot

I copied an example directly out of the help...

Ah, it doesn't work for "Log Probability"...well that's irritating

@blochwave nice news!!

@blochwave is this slowdown fixed?

i keep getting this error after a while in mathematica: ReplaceAll::reps: {2} is neither a list of replacement rules nor a valid dispatch table, and so cannot be used for replacing. I'm unsure of what I do to cause that... it's driving me nuts

@wesen We can't help you without seeing your code I'm afraid. (Trying to describe something in general is that much harder than explaining what's wrong with the specific case.)

yeah i know. the problem is that i don't really know how that suddenly happens. It happens after one manipulation, and then every Plot returns that, I am pretty much sure I only assign stuff to f[t_], and use only t as a variable. I ClearAll[f,t] but the error subsists until I restart the kernel.

I'll keep an eye on it, I said that on the off-chance that someone may know what is happening