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Closed 10 years ago.
In Qt how the implementation of graphs i.e plotting of graphs is supported?
Do we have any Qt classes or libraries for it as there are for other features ?
The graph here to be drawn is a linear graph drawn between Current and voltage.
for graph interpolation and extrapolation you can use qwt libraries..
http://qwt.sourceforge.net/
As extensive as Qt is and as many areas as it's trying to cover, you have to realize that Qt is not a one stop shop for your GUI projects. With that said, the answer to your question is simply "Yes". Sure that's possible. But not as native functionality within Qt. (Unless someone would prove me wrong here. I'm unaware of such functionality) Qt provides all the crayons you could ever wish for, but does not always do the drawing for you.
Luckily however, there are those who have developed various add-on libraries using Qt as a base. For example there is Qwt. As they say themselves: "The Qwt library contains GUI Components and utility classes which are primarily useful for programs with a technical background."
They provide a number of widgets for plots with all kinds of line styles to fit certain data sets. I'm sure that either you'll be able to find something which fits your needs in there. Or if not, you can extend its functionality to fit your needs.
P.s.: I am assuming here that you wish to plot your data in the end. If this is not the case, this might be overkill.
Related
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Closed 10 years ago.
I have to generate a series of random numbers using XQuery.I found a set of libraries but those are paid.If anyone can give me a direction it would be much appreciated(preferably code).
The standard XQuery languages provides no random function, but many implementations do. Some examples for open source implementations:
BaseX provides a Random Module
Zorba has a Random Module, too
eXist-db has some suitable functions in the Util Module
MarkLogic provides the xdmp:random() function
As an alternative, most Java implementations of XQuery (such as BaseX, Saxon or Qizx) provide so-called Java bindings in order to evaluate Java code:
declare namespace math = 'java:java.lang.Math';
math:random()
If the implementation support the latest XQuery 3.0 specification, this can also be written as a one-liner:
Q{java:java.lang.Math}random()
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Closed 10 years ago.
I've been asked to model my application. I'm not clear what this means, Perhaps something related to the architecture of my project?. Does it mean giving them a break-up of the classes? Or something like building a use-case or class diagram? Or perhaps something else?
EDIT: I cannot ask them!
I'd go with UML (Unified Modelling Language). It allows you to lay out classes, methods, inheritance, etc. in a graphical format.
A quick Google search gives this FOSS option:
Umbrello UML Modeller
EDIT: Just realized that's linux-only, so here's the Wikipedia page for a whole bunch of other options.
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Closed 10 years ago.
I am in this situation where I need to select a Flex type (image placeholder/image type/image container) for passing parameters in/out of different functions in an image editor. And, those different functions are either another image-manipulation/processing function or a function that display/render the image in a display component.
For example, I will ask other teammates to create a function that processes an image (possibly piped from other image processing functions, too), (let it be fancy or basic image processing from changing colors, to scaling, to segmentation, etc.).
Which of the two would you pick for passing in/out different functions? Display Object or bitmapData, and why (reusability, performance, standard practice, etc.)?
I always use the lowest level object I can get away with, so I'd probably go with BitmapData, unless there are compelling reasons to do otherwise. This has the advantage that you can then reuse the code in Flash if you need to.
BitmapData. What would be the motivation for passing a DisplayObject ? You have to look at the functionality provided by the two classes and decide based on your tasks which one is appropriate.
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Closed 11 years ago.
I would like to know what are the best practices for building Predictive Modeling solutions organically ?
Some of the questions I have are :-
If I have multiple R model files, what are efficient ways of storing them ?
Save as .Rdata files on file system
Serialize to a DB as binary objects
Since data is processed to create an interim model specific format, is it helpful to use such paradigms as PMML ?
Also, should one consider such practices as MVC (I'm not a trained software developer, so any insights into such development practices would be very helpful)
I apologize for the open-ended nature of this question. I wish to understand even simple things as recommended folder structure for data staging, model store, scripts collection and such other elements of a data mining solution.
I would be very grateful to members of the community for sharing their experiences and recommendations.
Thank you for your time.
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Closed 12 years ago.
Are there any resources that compare the recently released (Jan 13, 2011) asp.net MVC 3 to Rails 3? I've looked around and couldn't find any comparisons but figure there must be something out there.
The last time I used asp.net was with MVC 1 and I'm wondering what sort of improvements they've made since then. I'm fairly new to rails so I'm not sure I can make a good comparison just by looking at asp.net MVC 3 itself. I'm hoping someone more familiar with the two frameworks has already made a comparison.
Sorry if this isn't the right place to ask but I do consider this a programming question.
EDIT:
I'd like to know specific comparisons between the frameworks. Advantages/disadvantages over using one over the other. View engines compared between the two. Static language vs dynamic language (if any comparisons apply). Ease of doing TDD/BDD between them. Features that are unique to each. Tools available, performance considerations, ease of use, etc.
Judging from the lack of responses the answer is either "no" or "not yet".