i am using vb.net / asp.net
my team created a web application (research database for cancer center)
i am wondering if anyone has an idea about drawing survival curves programmatically
i searched every where and couldnt find any idea
you have to study the equation of kaplan meier thoroughly and then try to do it using vb.net or c# datatable, then chart it using mschart control.
Please check this article
The use of MS Chart Control and VB.NET for Statistical Purposes: Plotting Kaplan-Meier Estimate.
Related
I'm using a tutorial (https://www.tidytextmining.com/nasa.html?q=correlation%20ne#networks-of-keywords) to learn about tidy text mining. I am hoping someone might be able to help with two questions:
in this tutorial, the correlation used to make the graph is 0.15. Is this best practice? I can't find any literature to help choose a cut off.
In the graph attached from the tutorial, how are clusters centrality chosen? Are more important words closer to the centre?
Thanks very much
I am not aware of any literature on a correlation threshold to use for this kind of network analysis; this will (I believe) depend on your particular dataset and how language is used in your context. This is a heuristic decision. Given what a correlation coefficient measures, I would expect 0.15 to be on the low side of what you might use.
The graph is represented visually in a two-dimensional plot via the layout argument of ggraph. You can read more about that here but the very high-level takeaways are that there are a lot of options, they have a big impact on what your graph looks like, and often it's not clear what is the best choice.
GOAL: I have to create a 3d model of a machine part. I have about 25 images of the same thing taken from different angles.
Progress: I am able to extract the coordinates for a label that is on the machine for most of the images.
Problem: but I have no idea how to proceed. I have read a bit about aero-triangulation, but I couldn't figure out how to implement it. I would really appreciate it, if you could guide me in the right direction.
It would be really helpful, if you could provide your solutions using python and opencv.
Edit: sorry but I cannot upload the code for this one as it is confidential. don't blame me please I am just an intern. Although I can tell that I cropped a template of the label from an image and then used Sift to match that template on all the images to get the coordinates of the label.
If you want to implement things yourself with OpenCV, I would command looking at SIFT (or SURF) features, RANSAC and the epipolar constraint. I believe the OpenCV cookbook describe those. Warning: math involved. And I don't know how to do dense mapping in OpenCV.
I know the GUI program "VisualSFM" that can automatically recreate 3D model from images. It uses SFM and other command line utilities behind the scenes. Since everything is opensource, you could create a python wrapper around the actual libraries (I found https://github.com/mapillary/OpenSfM asking Google). VisualSFM prints the command it calls, so a hacky way could be to call the same commands from python.
If it is a simple shape and you don't want to automate it, it could be faster to model it yourself (and the result could look better). In 1.5 week I managed to learn the basics of blender and to model a guitar necklace: https://youtu.be/BCGKsh51TNA . And I would now be able to do it in less than 1h. How long are you ready to invest to find a solution with OpenCV?
I have many 3D vectors. I want to plot them in a cube so that each dimension is on a particular side of the cube.
Now, I am looking for some visualization/tool or library that lets me rotate this cube in 3D and see the vectors in various different angles.
Thanks
Abhishek S
Try Processing, it is somewhat intended for data visualization and in addition to simple control over 3D drawing, it also has the full power of Java programming language. You can see numerous works, done by other people on OpenProcessing.
However, if you are into anything serious, I would suggest you to use some ohter IDE than the default one. I use Eclipse for that, importing Processing as a library into my project. It requires a tiny boilerplate to work, but then you're happy!
I've been working on 2D games for a long time now (because 2D is all I know how to do) and want to step it up a notch. I don't want to go fully 3D because I don't think I have the mathematical knowledge to work with 3D graphics, but instead want to start developing some graphics that lie somewhere inbetween.
By inbetween I mean graphics that will still render as 2D, but may have been created using 3D software and then exported at various angles. Some examples of the style could include:
Age of Empires 1.
Diablo 1 & 2.
Starcraft 1.
Is there any software used specifically for creating a 3D model and then generating a 2D sprite-sheet from it? Here is an example of such graphics that may help in making sense:
Blender is free 3D modeling tool, where you can make sprite sheet out of the model. I don't know how to do this but I know it's possible, because my friend is using it for our game (he is making 3D spaceship models and transforming them into 2D sprites)
http://www.blender.org/
I am not aware of such a specialized software, but have you considered simply using a 3d engine with a fixed camera looking at the scene from above and all objects at ground level?
That way you can use regular tools for modeling and still have the logic and (with a few settings to the physics engine) physics of a of a 2D game.
Unity engine might be able to help you.
I have a black and white 2D drawing of a silhouette (say, a chess piece) that I would like to rotate around an axis to create a 3D object.
Then I want to render that 3D object from multiple angles using some sort of raytracing software, saving each angle into a separate file.
What would be the easiest way to automatically (repeatedly) 1. get a vector path from the 2d drawing 2. create the 3D model by rotating it 3. import it into the raytracer.
I haven't chosen a specific raytracer yet, but Sunflow has caught my eye.
Texturing/bump mapping would be nice but non-essential
The modeling feature you're looking for is a Lathe.
Sunflow can import 3ds files and blender files.
I've never used blender, but here's a tutorial for using the lathe to make a wine glass. You'd replace the silhouette of the wine glass with your shape:
http://www.blendermagz.com/2009/04/14/blender-3d-lathe-modeling-wine-glass/
Blender is FOSS, you can down load it here:
www.blender.org/download/get-blender/ (can't post more than one link, so you'll have to type this one in yourself :-)
I found a pretty cool site where you can do this online, interactively:
http://www.fi.uu.nl/toepassingen/00182/toepassing_wisweb.en.html
No great detail revolution but maybe you can find the code and extend it to your needs.