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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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Interpolate colors in 4-D data with matplotlib

I have 4 D data, with 3 independent variables (x,y,z), and a fourth variable m (represent in color) which is a function of the x,y, and z. The code below generates a plot with the three variables, and m with shades of a color. Is there a way to…
user58925
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Plotting a 4-D continous line in Python

I used the solve_ivp function in Pyhon in oredr to solve a system of four coupled differential equations, and now I wish to plot the solution in order to show its stability close to a certain fixed point, in the 4-D phase space. I was thinking a…
B.Gu
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Matlab interpolation of 4D scattered data

We have a 195x4 (double) matrix: A=[X Y Z temp], when ploted with scatter3(A(:,1), A(:,2), A(:,3),30, A(:,4), 'filled' ) gives something like this: Now we want to generate a 'cube' colored with the interpolation of the temp=A(:,4) vector data. So…
cavereaper
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How to make a 4D plot in Plotly?

I want to know how to make a 4D scatter plot using Plotly. 4th Dimension being the colour of another attribute? I am able to do it in Python but not using plotly. Below is the sample code: trace1 = go.Scatter3d( x = df['XXXX'], y =…
Shyam V
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4D expecting a variable with pointers and array

Here is the snippet: C_TEXT($1;$text) C_POINTER($2) $text:=$1 $vlElem:=Size of array($2->) Repeat $vlElem:=$vlElem+1 INSERT IN ARRAY($2->;$vlElem) $vlPos:=Position(Char(Carriage return);$1) If ($vlPos>0) …
Dylan
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How to multiple a 2D point with a 4D Matrix

How can I convert a 2D point (or 3D with Z=0) to 2D point(where Z is ignored) with a 4D matrix ? I am using Microsofts Silverlight to project a 2D control as pseudo 3D using a Matrix3D definition of Matrix3D I know the initial 2D coordinate of a…
rob
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Calculate 3D cross section of 4D shape (tesseract)

So far I have read the following on calculating the points of the 3D intersect for a 4D object: Simple implementation of 4D cross-section How do I get a 3D cross section of a 4D mesh? However, I am really confused on whats going on. I understand…
name
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How to make a 4D plot using Matplotlib

I have a 4D data like below. I really want to make a 4D plot with Matplotlib. The plot I am looking for is exactly like the 4D scatter plot made by @user3666197 It looks so great. I did some research but still have no idea how to make one like it.…
Lenny
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gnuplot, plotting 4D graph where colour is used to represent the 4th column

My question is a continuation of: 3-Dimensional Plot in GnuPlot where color is a fourth column in my data file?. I am trying to do basically the same thing with some data of mine. However, when I take the existing code and apply it to my text file,…
Astronomer
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Visualization of 4D vectors in Python

Similar questions have been asked in the past in this site - such as Representing 4D data in mplot 3D using colormaps or How to make a 4d plot using Python with matplotlib - but as far as I have found, none of them answers my specific problem. I…
Daneel Olivaw
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Linear interpolation of the 4D array in Python/NumPy

I have a question about the linear interpolation in python\numpy. I have a 4D array with the data (all data in binary files) that arrange in this way: t- time (lets say each hour for a month = 720) Z-levels (lets say Z'=7) Y-data1 (one for each t…
Anna_Brownie
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4D plot (3D+color) from 4 row vectors

I have 4 row vectors x, y, z and s, all of them have equal sizes 1*size. x, y, z should be the three Cartesian corodinate axes and s should be represented by colors (I want figure like below image). The statement Surf does not accept row vectors. I…
Mr. Nobody
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Matlab 4dplot (x,y,z,t)

I am trying to plot a graph of thousands of data point containing x,y,z,t. The data is in a .txt file and looks as follows: [x, y, z, time] [50.9160, 12.2937, -44.9963, 0.0] [50.9160, 12.2937, -44.9963, 0.8] [50.9160, 12.2937, -44.9963,…
Sagistic
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MATLAB re-position colorbar title

I would like to reposition the colorbar title (not the colorbar itself). I tried using the following code: cb = colorbar; set(get(cb,'title'),'string','Dislocation Density(m^{-2})'); lbpos = get(cb,'title'); pos…
Kelvin S
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How can I control the color and opacity of each point in a python scatter plot?

I'm looking to graph a 4D data set (X, Y, Z, intensity) using opacity to represent intensity. I also want the color to be dependent on the Z variable as well to better show depth. Here is the relevant code so far, I am a novice when it comes to…
NGXII
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