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replace the solution of problem 66 and set the difficulty

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Fisher Wang
2021-03-11 17:10:53 +08:00
parent 0d8a4a025b
commit 8527c7c83c
6 changed files with 7 additions and 37 deletions
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12
100_Numpy_exercises_with_solutions.md
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@@ -674,20 +674,10 @@ I = [1,3,9,3,4,1]
F = np.bincount(I,X)
print(F)
```
#### 66. Considering a (w,h,3) image of (dtype=ubyte), compute the number of unique colors (★★★)
#### 66. Considering a (w,h,3) image of (dtype=ubyte), compute the number of unique colors (★★☆)
```python
# Author: Nadav Horesh
w,h = 16,16
I = np.random.randint(0,2,(h,w,3)).astype(np.ubyte)
# The parenthesis around 256*256 ensure the dtpye promoted to uint32 properly.Otherwise the first term will overflow.
F = I[...,0]*(256*256) + I[...,1]*256 +I[...,2]
n = len(np.unique(F))
print(np.unique(I))
# Another solution
# Author: Fisher Wang
w, h = 16, 16