Wolfram Mathematica

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b3m2a1

3:29 AM

@Edmund it’s in Parallel`Developer` if memory serves

Or rather that’s where all the proper implementation methods reside

2 hours later…

b3m2a1

5:27 AM

@andre I'd actually never seen this. It doesn't help me much as I don't use Windows, but it's still interesting to see.

1 hour later…

KraZug

6:54 AM

What is the best option to add to get this ODE to solve correctly? It should be about -3 at this point. AccuracyGoal->9 or higher does it, but it has come up inside an automated routine.
x1[0] /. NDSolve[{{Derivative[1][x1][x] == 3.1937438845342623` x1[x] + 1.` x2[x], Derivative[1][x2][x] == (10.2` + 18 E^-x^2) x1[x] + 3.1937438845342623` x2[x]}, {x1[61] == -0.9543135154205278`, x2[61] == 0.2988071523335983`}}, {x1, x2}, {x, -61, 61}][[1]]

b3m2a1

7:08 AM

@halirutan since you hacked together the little question helper, what's the best way to add a little helper that will use JS to edit the HTML of a page to add in a little cloud notebook that you can open / close to run code in, a là what I did here: mathematica.stackexchange.com/a/162305/38205

StackExchange doesn't let you use arbitrary HTML or JS in posts so I'm not sure how to roll this

3 hours later…

Jacccy

9:52 AM

Dear all,
how can I increase the length of the ticks inside of the following ShowLegend command?

ShowLegend[Show[ListLinePlot[
{
Transpose[{Range[1,5,1],Table[-x^2+RandomReal[2],{x,5}]}],
Transpose[{Range[1,5,1],Table[-x^2+RandomReal[2],{x,5}]}],
Transpose[{Range[1,5,1],Table[-x^2+RandomReal[2],{x,5}]}]
},
PlotStyle->{Black,Red,Blue},
PlotRange->All,
FrameTicks->{{Automatic,None},{Automatic,None}},(*ticks are plotted {left,right},{bottom,top}*)
ImageSize->{N[GoldenRatio]550,550},
BaseStyle->{FontFamily->"Arial",FontSize->20},

3 hours later…

Edmund

1:15 PM

@b3m2a1 I had a look with ?Parallel`Developer`* and nothing seems to fit with ParallelSumbit

2 hours later…

Jason B.

2:55 PM

@Szabolcs - do you have any experience profiling the memory used by active MLEs? They don't seem to influence MemoryInUse[]. If my c-coding were better I imagine I could do it on the library side, but I just wonder if there's a way from within M to query the memory being used by the kernel - the memory that shows up in Activity Monitor for WolframKernel

2 hours later…

Szabolcs

5:19 PM

@JasonB. What's an MLE?

Managed Library Expression?

zed111

5:37 PM

Hi, I have am trying to solve a linear equation Ax=b using Solve. The system should have an infinite number of solutions, which I checked by doing by hand. But mathematica gives me just one solution due to floating point precision. Is there a way to get infinite number of solutions

Kuba

6:19 PM

@zed111 Rationalize your numbers? don't use 1.5 but 3/2 etc.

zed111

Thanks @Kuba

Actually, all numbers are read from a file. Then some computations are performed in mathematica like root finding to produce the matrix A. This is where I think the exactness is lost.

I probably need some way to tell mathematica to ignore some last final digits of the elements of the matrix A and b

{{43.777872764528304`, 0.` + 43.777872764528304` I,
0}, {0.` + 43.777872764528304` I, -43.77787276452827`, 0}, {0, 0,
0}} This is the Input form of the matrix

I want to tell mathematica to use, say, this: {{43.7779, 0. + 43.7779 I, 0}, {0. + 43.7779 I, -43.7779, 0}, {0, 0,
0}}

b3m2a1

6:37 PM

@Edmund take a look at Send:

Needs["Parallel`Developer`"]
Parallel`Developer`Send::usage

"Send[kernel,cmd] sends cmd for evaluation to the given remote kernel \
or list of kernels."

2 hours later…

Jason B.

8:14 PM

@Szabolcs sorry, yes - most everything I know about working with them I learned from your package

I just notice that I can create a huge object in LibraryLink (to purposely bloat the memory), and it shows up in the OS's activity monitor as belonging to WolframKernel, but MemoryInUse[] shows nothing of the sort

1 hour later…

Jason B.

9:27 PM

@halirutan - do you know if there is a way on this site to indicate that a given chunk of code should not be highlighted as WL, but as c-code instead?

Think I figured it out

b3m2a1

@JasonB. you can do that with HTML comments

Kuba

@JasonB. meta.stackexchange.com/questions/184108/…

Jason B.

excellent - as usual I can't be bothered to read the manual

but I did look at another post and saw how szabolcs did it

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