Any ideas why the display command in DSX gives such ugly image unlike the ones in Databricks? Plus I don't see that I can even add a hue color (even default) is ok like Databricks.
Databricks
Data Science Experience
As per David Taieb's comment, this has been acknowledged as an issue: https://github.com/ibm-cds-labs/pixiedust/issues/77
I've added David's comment as an answer so that the question can be closed (by accepting this answer). Future discussions around this should now take place on the github issue.
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I have tried to use this snippet of code
https://code.msdn.microsoft.com/windowsdesktop/Net-Implementation-of-a-d3ac7b9d
to implement a heap-based implementation of Prim's algorithm to solve the Minimum Spanning Tree (MST) problem in a non-directed connected graph.
after a few iterations, i find that the heap/priority queue is not well maintained anymore.
that is the head of the PriorityQueue doesn't have the lowest Key in the Heap.
PQ 0 [-7230, 309]
...
PQ 146 [-7277, 308]
Has anyone use this code and experienced similar problems ?
I can post a link on GitHub if anyone would be looking at it
My needs are for a heap datastructure which supports deletion of an element in the middle. It looks like Fsharpx.collections doesnt have such a data structure.
does anybody know a good implementation available somewhere ?
thanks
Recently, I ported a MaxHeap from PLINQ to F# here and made it MinHeap. It is array-based and performs much better than any "pure functional" alternative.
However, after a lot of benchmarking, I found that SortedDeque based on just a simple sorted circular buffer performs significantly better on most use cases even when I need to add or delete in the middle.
My answer is inspired by V.B. but here it is in full
I have used another library than FSharpx.collections, it is called
Spreads
read that page for details and instructions.
SortedDeque is the data structure i need for this problem.
I used the same code, just changing from the microsoft blog page code to the library functions and found the good result, so it is indeed some bug in the microsoft blog page code
PS. this spreads library has been designed to format financial data for quantitative analysis and i'm happy i found it !!! IT looks like this library is rather recent and thats why its not on top of Google's search or referenced in any other SO question (or if it is i didn't see it)
FSharpx.Collections is of no use for that problem as you can see from that discussion heap issue in FSharpx.Collections
Does it happen that no one ever needs histogram in Delphi ?
Google gave me a bunch of half-baked code snippets. But it means that each time you need one - you have to invent one more ad hoc bycicle.
Torry mostly told me about some very expensive closed source Math Statistics or Financial packages, that as a subproduct have histograms. But they are very expensive and since you have no source code, each time you install update onto IDE/RTL/VCL you're probably screwed, until the vendor would make (soon ? ever?) updated packages. Given thatvendor is still does exists.
S.O. told me nothing, nil.
For what i found...
Mitov.com provides some histograms in PlotLab. which told to be free for non-commercial. Alas, it is again closed-source, and if the Histogram - quite fancy let's admit -is the onlything i need from it - why pay the whole price ?
One more example http://DSpatial.sf.net
Just few years ago i used it in Delphi 5, but even then i felt the author is loosing interest in the project. I made few enhancement, fixed some bugs, he merged them and that's all. The component was not very useful and lacked upon features, yet better than nothing. Now the project seems to be completely dead. Good old days, etc. But i do not want them back :-)
And Stack Overflow seemingly carries no single question about it. But maybe just no one bothered to create topic, after search found nothing ? I mean, Delphi was created for database access, histograms are one of basic ways to visualize data, and no one crosses them ? Something with nice style, with rich mouse tooltip like in HTML/CSS/JS on http://www.moskva.fm/stations/FM_95.2 ?
Or is this too domain-related and not ever possible to have good abstraction ?
TChart is a control that ships with most versions of Delphi. TChart can be used to make histograms (bar charts) in style. The following give you some ideas about how to use it: http://www.digitalcoding.com/tutorials/delphi/Simple-steps-to-create-Delphi-chart.html and http://delphi.about.com/od/adptips2006/qt/chart_selectbar.htm .
If you need something with code, google the pages at delphiforfun.org/programs/oscilloscope.htm . These are not controls. The oscilloscope article has a histogram with source. Some of the other projects at the site have other histogram graphs with source..not elegant but useful and free. Use them as a template to make your own control.
The link at http://delphiforfun.org/programs/Math_Topics/probability_distributions.htm shows how to make your own statistics displays with "histograms." This example makes use of TChart.
Here is some more stuff to try I found looking at my resource file:
http://wiki.lazarus.freepascal.org/TAChart, http://members.home.nl/mvanwesten/en_lazarus.html , http://www.martinole.org/TAChart.html ...some of these are GPU components that supposedly work with some versions of Delphi. Perhaps this is your lucky day as there is some source code. The first and third listed probably will work reasonably for histograms. You may have to write your own statistics algorithms.
Found this thread while doing some searching. The ImageEn component suite has a THistogramBox component. It's the NOT prettiest thing in the world, but it's the only one I've found so far.
http://www.imageen.com
I came across a histogram example in a gdiplus package available for download from code central. I don't know if it will do what you need but when I saw it I remembered your SO question.
HTH.
If you were using firemonkey, you could just created a series of TRectangles in series. They can be made unclickable by turning hittest off. Or is that too easy and straightforward?
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Is there a free (as in "cheers"), linux-compatible, interactive visual editor for graphviz or other graphs? aptitude seems to be drawing a blank.
edit: "cheers" means both "beer" and "speech". meta-edit: I guess it should be "free as in beach".
edit 2: Maybe a suitable svg editor would be a more realistic goal. I basically want something that can be used to conveniently create a collection of labeled shapes and lines which connect them. Actually it would probably make more theoretical sense to extract the graph from this data, since it includes both semantic data (the graph) and presentation data (the way it's arranged on the screen, the colours used, etc). Is there a way to lay out labeled shapes conveniently with inkscape or some other free vector graphics editor? I really need rearranging of the nodes, and (re)flowing of the text in them, to happen with maximum convenience.
I've also realized that this is really a superuser question. I was going to repost it over there when I found an existing question that seems likely to provide me with an answer: dia.
edit 3: dia seems useful except that it doesn't seem to be possible to get the textual contents of node objects to wrap in any useful manner (ie any way other than by inserting manual line breaks). This is kind of a dealbreaker, since it screws most of the convenience factor that's my incentive to do things this way rather than with a text editor or a pen and paper. But it supports some sort of event model and Python-based scripting, so I'm going to dig around a bit and see if I can use python to wrap the text in response to content changes. Unless one of you lovely people has a better idea..? Basically I want to have the option to explicitly set the node size via GUI interaction, and have the contents wrap and rescale (within a certain range of font sizes) to fit it. Rich text would be pretty useful.
In other words, this is actually a valid SO question at this point, since it appears to require coding.
To save time those eager to try existing programs handling DOT graphs:
dotty can display DOT graphs and with little luck you can move its nodes with a mouse, nothing more, and you can easily segfault as a bonus (I tried latest stable graphviz)
lefty is only a special-purpose language interpreter used by dotty, nothing to look at
KGraphEditor is an empty wishful project (a QT window and a few buttons)
gvedit is not really a graph editor: it provides a simple text editor and you hit F5 to run a layout tool and open a picture; you can actually get more functionality from configuring your own favourite text editor
grappa is an abandoned java applet, which I failed to run
interestingly, dia can export to DOT ("PyDia DOT Export"), but due to its buggy printing, you have to post-process the files to use them
graphedit can read in DOT a graph and you can move its nodes around and change their colors
Eclipse people started working on DOT support in GEF4, so it can display DOT graphs
GraphUI has a very interesting demonstration video, but beware: although it might seem that the graph is being created by clicking and dragging, in reality all editing happens through the keyboard, using shortcuts. On the plus side, contextual instructions are always available showing which shortcuts do what.
DotEditor claims a tree editor, modifying node attributes/color/shape with mouse.
The graph editors mentioned in other answers, yEd (a Java application) and JointJS/Rappid (a JaveScript thing) apparently have nothing to do with DOT (tried both).
I believe there exist no working DOT-handling graph editor out there at all.
JointJS is a Javascript graph editing library based on Backbone : http://www.jointjs.com/
The author also provides Rappid, an online graph editor which might suit your needs, I don't know about dot files import though.
Where can I find the documentation for IdocScript for Stellent/Oracle UCM? I just got assigned to do maintenance on a page that uses it, and have no prior experience with either Stellent or the script. My specific problem has to do with string manipulation, but I can hardly find any documentation online at all, odd for a programming-related topic.
If you are after a book, there is the one by Brian Huff (Bex - http://bexhuff.com/) linked below.
Actually it is the only one. Written before Oracle bought Stellent and may be a missing some IDOC changes.
As a resourse tho it is very handy to have around as it touches on all things UCM (including a decent chunk on IDOC).
The Definitive Guide to Stellent Content Server Development
~ Brian Huff
Of course I answered my own question 15 minutes after I asked it. Oracle has a guide buried deep in its documentation website. It's available as a PDF or in HTML format (thanks, Raystorm).
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What do you use to capture webpages, diagram/pictures and code snippets for later reference?
Evernote http://www.evernote.com and delicious http://www.delicious.com
Evernote
Notepad2's clipboard feature (Notepad2.exe /c as a link in Launchy)
Windows Clippings or PrintKey
Firefox extension Page Saver
Delicious
Microsoft OneNote.
I just have an emacs instance running on my home machine, under screen. Whereever I am (and have network) I can connect to it remotely. I stick all useful urls, birthday present ideas, future dates, code snippets, ideas for docs etcetc in there.
I rarely have doodles/diagrams I need to capture, I tend to draw them in ascii in my file if needed.
I must admit I'm a bit stuck if I have no network/wifi somewhere, but that's rarely the case.
I find google notebook is very good for drive by code snippeting and google bookmarks especially as when used with the google toolbar, for web pages.
The benefit of these tools are that they are available from any pc on the web, though a good use of semantic organisation using labels is recommended.
Here's my response to a similar question:
The combination of OneNote with a tablet PC is awesome! I was a bit of a skeptic at first. I used the trial version and then forgot about it. A year later I had an unruly collection of files, project related emails, notebooks and scraps of paper all scattered throughout my life. I went back to OneNote and all my problems went away. Some highlights:
Everything is searchable. The character recognition is good enough that my chicken-scratch meeting notes can be searched. Text within images is searchable.
OneNote syncs with Outlook so finding meeting notes is a breeze.
I now embed all files into OneNote - pdfs, spreadsheets, word docs, images, web clippings.
OneNote is constantly saving all changes so, combined with a scheduled automated backup, everything is in one place and is safe.
There are some built-in collaboration tools I have yet to try but that look useful.
It is SO worth the price. It allows you to get started on a project and avoid all that time spent deciding how to organize things.
Zotero, is a nice plugin for Firefox.
SnagIt
captures everything you could want, and lets you annotate it.
I prefer to use the good old url for delicious
Apart from that i use the Scrapbook extension in firefox when i want to save something on the disk. It's possible to tag the page, edit it and remove those stupids ads before saving it.
I also have a Wiki on a stick that i carry around on a usbkey for code snippets that should go to other clients when i'm travelling around
Mostly, my code snippets are embedded into projects i carry on the same usb key, which allows me to demonstrate some technologies right off to the client and get his advice based on a demonstration, not a listing of code...
For screen shots, I use a mix between ScrapBook and ScreenGrab. They are both firefox plugins that are pretty amazing when you need to get a screenshot of a page for editing. Works great for consulting.
https://addons.mozilla.org/en-US/firefox/addon/427
https://addons.mozilla.org/en-US/firefox/addon/1146
Delicious Bookmarks extension for Firefox
It's a little primitive, but I've been using tiddlywiki (self-contained, single-file wiki) http://www.tiddlywiki.com/ which works good for basic text and markup. I combine it with a plugin to sync it with Outlook's notes (http://syncoutlooknotes.tiddlyspot.com/#SyncOutlookNotes) so that I can then sync it to my blackberry using the standard outlook-blackberry sync mechanism. This has the significant advantage that I can look at my notes and even write new notes when I'm out and about, away from my laptop, or just don't feel like lugging the laptop around to a meeting that I don't really need it for.
I'd prefer using something more advanced like Onenote, but being able to take my notes with my in the little blackberry has turned out to be a significant advantage.
Google Notebook is very convenient tool. You can clip and save any parts of web pages without leaving your browser tab. The Notebook plug-in automatically saves them as separate notes in your notebooks and keep the links back to the original web pages. You can organize your clippings later by moving them between your notebooks and/or tagging them. Very good for code snippets and references.