I am trying to visualize a data set (x,y,z,scalar) in comma separated values format. The style I want to recreate is something like a transparent 3d heat map. The value of scalar at coordinate (x,y,z) will determine the "mist density". No idea what the name of the style is. Links below give examples of what I mean:
https://www.paraview.org/wp-content/uploads/2014/04/densityoverlay.png
or
http://www.scidac.gov/Conference2006/speaker_abs/AhrensPic.jpg
Any references would be most useful as I am new to data visualizing.
Take a look at the Point Volume Interpolate filter with Kernel set to GaussianKernel.
Related
I would appreciate knowing how I can convert the cell values given after the OpenFOAM solution into the ones on the grid points. Is there any direct command for such a thing or I should work with the sampling option?
Thanks a lot for your help.
When you open your case using Paraview/paraFoam, then the interpolated fields at the points (nodes) are already computed by Paraview:
Fields with an orange small circle are the point data, while the fields that have an orange cube icon are the data at the cell centers, i.e:
You can also see the values of the fields (points or cell) using the Spreadsheet view and export them as CSV:
I need to train R-CNN on my dataset. Above Image is an example in which first column contain path to that image and second column contain coordinates of bounded box(ROI). How to get those coordinates in matlab. As my dataset is large so how those coordinates can be extracted by pointing manually.
for example if i am training R-CNN foe stop signs then second column contain coordinates of bounded box containing stop sign in whole image.
I do not know which version of MATLAB you are running, but I'm assuming it is fairly new (R2017a and later). Also, by 'how to get the coordinates', I assume you mean 'how to determine' or 'how to assign' the coordinates.
I believe what you need to do is to use one of the image labeling Apps called
imageLabeler
to annotate rectangles in your training images. You either do this manually if that's amenable, or you need to use automation algorithms if you already have a detector that does something similar. See this page for more details:
https://www.mathworks.com/help/vision/ug/create-and-import-an-automation-algorithm-for-ground-truth-labeling.html
Once you have the results of labeling stored in a groundTruth object, you would need to use something like objectDetectorTrainingData to create the table you are looking for.
See https://www.mathworks.com/help/vision/ug/train-an-object-detector-from-ground-truth-data.html for more details.
I was visualizing my vorticity vector field and notice that I am not able to see the pattern without zooming in as there are too many glyphs and are too packed.
Currently, I am using a calculator to combine X,Y,Z vorticity field into a single vector field using the calculator. Take a slice of it and do a glyph filter visualizing all points on the plane.
I notice that one possible way is to visualize a curved glyphs and scale up a little bit to make it more noticeable, but not sure how to do that. Does anyone know whats the steps to do that? Or any other suggestions?
TIA
Have you tried reducing the Maximum Number of Sample Points property in the Properties Panel when the Glyph filter is selected in the Pipeline Browser? You may also want to change the Scale Factor property to change the length of the glyphs.
I'm making an iPhone app that uses Core Plot at one point in the application. I'm drawing a graph using a CPTScatterPlot and along the line I have CPTPlotSymbol plot symbols.
the graph is looking really good after some customizing but what I want to do is give the user a bit better visual representation of where exactly on the graph the current material is referring to.
I would like to "highlight" individual plot symbols along my line. I have the location on the xAxis of the point I want to manipulate. I have not been able to find any example of this or even a suggestion that it's possible, it seems to be possible for pie charts and bar plots though.
If it is not possible to change or manipulate the actual plot symbol at a point I'm quite happy to simply draw something over the symbol. If so, is there a way to get the x,y coordinates (in relation to the screen) of each plot symbol? Or will I have to calculate that from my data? My data varies a_lot so I'm simply auto resizing the plot area at the moment.
thanks!
You can implement the -symbolForScatterPlot:recordIndex: datasource method to customize the plot symbol at each point. Return nil if you don't want a symbol drawn at the given index. The Mac version of CPTTestApp (in the Core Plot examples folder) has a plot symbol demo that shows how to use this method.
My question is that how do I change the polygons of a map from shp file (shapefile) while using matlab. I was doing this project where i was given map in shpfile format that I need to use on, I am able to read the map in matlab but the map is divide in regions and each regions have its color, my problem I met was to change the polygons to its respective colors, anyone sees this please kindly help and reply me asap.
Are you using the Mapping Toolbox by The MathWorks, or third-party codes such as ones from the Shapefile C Library to import the shapefile? If you are using the Mapping Toolbox, I cannot be of much help here as I do not have that toolbox -- hopefully, someone else can help here.
In any case, if you could import the shapefile on to your MATLAB Workspace, you should be able to find the vector data (polygons and attributes data, etc.) somewhere...
If you do not see anything on the Workspace, possibly you can find those data in the Figure (or in the Axis).
data=get(the_handle);
I would look for the data there.
After you obtain the polygon and properties data, you can patch/fill them with any color you like (based on any other information you find there.)
Good Luck