Added plot scripts and reworded to respond to PR comments.

1 files changed, 19 insertions, 0 deletions

diff --git a/doc/source/user/plot_approx.py b/doc/source/user/plot_approx.py
new file mode 100644
index 000000000..a2d6981d9
--- /dev/null
+++ b/doc/source/user/plot_approx.py
@@ -0,0 +1,19 @@
+from scipy import misc
+import matplotlib.pyplot as plt
+import numpy as np
+from numpy import linalg
+
+img = misc.face()
+img_array = img / 255
+img_gray = img_array @ [0.2126, 0.7152, 0.0722]
+
+U, s, Vt = linalg.svd(img_gray)
+
+Sigma = np.zeros((768, 1024))
+for i in range(768):
+    Sigma[i, i] = s[i]
+
+k = 10
+
+approx = U @ Sigma[:, :k] @ Vt[:k, :]
+plt.imshow(approx, cmap="gray")