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Questions tagged [4d]

4D involves calculations in four dimensions and typically relates to graphics programming. Use the [4d-database] tag for questions about the 4th Dimension database.

From Wikipedia, as of 5 March 2017‎:

In mathematics, four-dimensional ("4D") is a geometric space with four dimensions. It is typically meant to mean four-dimensional Euclidean space, generalizing the rules of three-dimensional Euclidean space. It has been studied by mathematicians and philosophers or over two centuries, both for its own interest and for the insights it offered mathematicians and related fields.

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Programmatically Finding the Faces of a Cube/Tesseract

I am working on a cube/tesseract visualization project and I need help with programmatically finding the faces/sides of a cube/tesseract. For both n=3 and n=4 I would like a face to be 4 connected vertices, for example: face[0] = [0, 1, 3, 2] 6 of…
Lars-Lasse
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4D Scatterplot: Plots' respective sizes based on frequencies

Assuming we have this reproducible dataframe: set.seed(949494) Rating_1 <- round(runif(50, 1, 5)) Rating_2 <- round(runif(50, 1, 5)) Rating_3 <- round(runif(50, 1, 5)) ID <- rep(c("H", "G"), 25) Quality <- Rating_1 * Rating_2 * Rating_3 DF <-…
Smuts94
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4D plots with single colour describing the 4th dimension and connected by line

I have been searching the internet for the past couple of days and I have not seen any solution. I will be grateful if someone can please have a look. I am trying to plot a 4D plot to show wind direction variation at a given longitude, latitude, and…
Tee
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4d convolution, i want to add conv4d to my model but the custom function doesn't work

I have a u-net module, i want to change the conv3d with conv4d, when i looked on google i found some custom conv4d functions but I am having hard time executing them. can someone show me the right way to call them and remove the errors here are the…
Youssef Khemiri
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Displaying 4th variable as colormap on 3D plot in Python

Task I am trying to generate a plot that would represent my data in 4 dimensions. The option I am going for is a 3D plot where the 4th dimension is represented with a colormap. My data has some NaN values. My attempt Using an arbitrary set of data,…
vshis
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4d plot in R (how to color points in space)

I would like to create 3d plot for x,y,z (cordinates) and values expressed as a color, calculated from a function conc1. I tried with this code: #declaration of some parameters of function "conc1" Q<-1 t<-0 sx<-sy<-sz<-1 #coordinates of…
Ana
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Matplotlib - custom cmap not in accordance with graph colors if the some data is not available

I have the following code: fig = plt.figure() ax = fig.add_subplot(111, projection='3d') ax.set_xticks(weightdecay) ax.set_yticks(learningrate) ax.set_zticks(trainbatchsize) arr = numpy.array(f1) new_col = arr.copy() new_col[arr < 0.5] =…
Milos Cuculovic
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Plot 4D data and further extract few slices at specific Z

I have 4 columns (longitude, latitude, depth (Km), Value) and I want to plot in python and later extract some slices at specific depth from this plot. Here is my try but I do not know how to further plot a few slices (e.g at depth of 2,4 and 5…
Aqeel
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How to find evenly distributed points around a point on a plane in 4D?

I'm trying to create a simulation that requires me to vary a set of probabilities, i.e., the variables must add up to 1. When I wanted to vary the parameters of a set of 3 probabilities, I treated each parameter as an axis in 3D space and…
Jgible
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4D array numpy into pandas

I'd like to transform my numpy array ( shape=(27, 77, 77) ) : [[1., 1., 1., ..., 1., 1., 1.], [1., 1., 1., ..., 1., 1., 1.], [1., 1., 1., ..., 1., 1., 1.], ..., [1., 1., 1., ..., 2., 2., 2.], [1., 1., 1., ..., 2., 2., 2.], …
Vnc J
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Disparity maps in light field images not only stereo-based vision but multiple views

I would like to ask about disparity maps in context of multiple views (captured by horizontal and vertical cameras). I understood that disparity map is the difference of the pixel location between a pair of views in stereo-based images. I am…
Ana
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Plot 4D Contour in Python (X,Y,Z + Data)

I have a large set of measurements that I want to visualize in 4D using matplotlib in Python. Currently, my variables are arranged in this way: x = np.array(range(0, v1)) y = np.array(range(0, v2)) z = np.array(range(0, v3)) I have C which is a 3D…
user3849502
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Healpy and the 4D Sphere - how to use pix2ang to create the 3 arrays of angles (ksi, theta, phi)?

I am working with hyperspheres and would like to use healpy to create the three angles ksi, theta, phi for a nside hypersphere. How do I do that considering that these are the four coordinates of this…
Marco Pereira
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4d curve fitting

I am using Surface fitting toolbox in Matlab r2010b to curve fit 3 dimesional data. This tool is very useful and easy tool for doing 3d curve fitting via GUI. Until now, I deal with 3d data like; (X input : x (n x 1 vector), Y input : y (n x 1…
sanem
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Plotting 4 & 3 dimensional data - matlab

I have data set to plot with the following dimensions. Density Accessibility Land use mix Vibrancy Help me with the steps of the task. Expected output will be
Samith
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