I ran PCA on a data frame with 10 features using this simple code: pca = PCA() fit = pca.fit(dfPca) The result of pca.explained_variance_ratio_ shows: array([ 5.01173322e-01, 2.98421951e-01, 1.00968655e-01, ...

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My formula f=arctan(ImZ/ReZ) There are two options: Option 1 (atan): ImZ=-4.593172163003 ImR=-4.297336384845 >>> z=y/x >>> f1=math.atan(z) >>> f1 0.8186613519278327 Option 2 (atan2) >>> f=math.atan2(y,x) >>> f -2.3229313016619604 Why are these two results different?

I load images with numpy/scikit. I know that all images are 200×200 pixels. When the images are loaded, I notice some have an alpha channel, and therefore have shape (200, 200, 4) instead of (200, 200, 3) which I ...

I wonder is there any easy way to do geometric mean using python but without using python package. If there is not, is there any simple package to do geometric mean?

Sorry, I am pretty new to sympy and python in general. I want to solve the following underdetermined linear system of equations: x + y + z = 1 x + y + 2z = 3

def cube(number): return number^3 print cube(2) I would would expect cube(2) = 8, but instead I’m getting cube(2) = 1 What am I doing wrong?

I have two values (previous and current) and I want to check change between them (in percent): (current/previous)*100 But if the previous value is 0 I get Division By Zero, and if value will not change I get 100%.

Note: I asked this question before but it was closed as a duplicate, however, I, along with several others believe it was unduely closed, I explain why in an edit in my original post. So I would ...

I am making small game with pygame and I have made a gun that rotates around its center. My problem is that I want the gun to rotate by itself to the enemy direction, but I couldn’t do ...

I have been not using math for a long time and this should be a simple problem to solve. Suppose I have two points A: (1, 0) and B: (1, -1). I want to use a program (Python or whatever ...