transformation – Page 2

Is it possible to directly apply an affine transformation matrix to a Mayavi ImageActor object?

April 21, 2023 by Tarik

ImageActor, which ultimately is a wrapper for tvtk.ImageActor, has a user_matrix property, which lets you assign a 4D transformation matrix. Starting with a random image, import numpy as np from mayavi.mlab import imshow s = np.random.random((10, 10)) image = imshow(s, colormap=’gist_earth’, interpolate=False) gives us the following … Creating a transformation matrix and setting a term … Read more

Understanding `scale` in R

February 8, 2023 by Tarik

log simply takes the logarithm (base e, by default) of each element of the vector. scale, with default settings, will calculate the mean and standard deviation of the entire vector, then “scale” each element by those values by subtracting the mean and dividing by the sd. (If you use scale(x, scale=FALSE), it will only subtract … Read more

The easiest way to transform collection to array?

November 30, 2022 by Tarik

Where x is the collection: Foo[] foos = x.toArray(new Foo[x.size()]);