英文:
Why does scatter plot not plot all the points
问题
我有一组点：
a = [0.61561561, 1.24828584, 0.15447159, 0.94014534, 1.24828584,1.24828584, 0.92375611, 0.92375611, 0.47900132, 0.52270525,0.61561561, 0.47900132, 0.47900132, 0.3984379 , 0.3984379 ,-0.75793657, -0.2629685 , 0.36970173, 0.36970173, -0.75793657,-0.66502621, -0.20388219, -0.06270612, 0.94014534, 0.61561561,-0.66502621, -0.86528859, -0.86528859, -0.86528859, -0.54075886,-0.12331877, 0.045172 , -0.20388219, -0.91880682, 0.15447159,-0.06270612, 0.47900132, 0.47900132, 0.92375611, -1.0824663 ,-0.86528859, -0.40414457, 0.01329552, 0.01329552, -0.86528859,0.01329552, -0.86528859, 1.24828584, -0.91880682, -0.12331877,0.83084575, 0.3984379 , 0.3984379 , 0.94014534, -0.20388219,0.83084575, -0.29679254, -0.86528859, -0.75793657, -0.12331877,0.36970173, 0.12064755, -0.86528859, -1.0824663 , -0.4478485 ,-0.86528859, 0.06156123, 0.94014534, -1.0824663 , -0.20388219,-1.0824663 , 0.01329552, 0.01329552, -0.4478485 , 0.01329552]b = [-5.02614441e-01, 2.52924699e-01, -2.35966674e-02, -1.25032819e-04,2.52924699e-01, 2.52924699e-01, -2.49564710e-01, -2.49564710e-01,4.78892741e-01, 5.21987286e-01, -5.02614441e-01, 4.78892741e-01,4.78892741e-01, -8.80642424e-01, -8.80642424e-01, 4.28537473e-01,4.98515651e+00, 1.25405479e+00, 1.25405479e+00, 4.28537473e-01,-5.96064254e-01, -1.07508203e+00, -4.01624650e-01, -1.25032819e-04,-5.02614441e-01, -5.96064254e-01, 3.04076047e-01, 3.04076047e-01,3.04076047e-01, 8.06565455e-01, 2.84453137e-01, 7.51565383e-01,-1.07508203e+00, 3.30514875e-01, -2.35966674e-02, -4.01624650e-01,4.78892741e-01, 4.78892741e-01, -2.49564710e-01, -7.39519357e-02,3.04076047e-01, -1.74941727e-01, -6.97054046e-01, -6.97054046e-01,3.04076047e-01, -6.97054046e-01, 3.04076047e-01, 2.52924699e-01,3.30514875e-01, 2.84453137e-01, 7.75037017e-01, -8.80642424e-01,-8.80642424e-01, -1.25032819e-04, -1.07508203e+00, 7.75037017e-01,-5.04803011e-02, 3.04076047e-01, 4.28537473e-01, 2.84453137e-01,1.25405479e+00, -5.72592620e-01, 3.04076047e-01, -7.39519357e-02,-2.18036272e-01, 3.04076047e-01, 1.00100506e+00, -1.25032819e-04,-7.39519357e-02, -1.07508203e+00, -7.39519357e-02, -6.97054046e-01,-6.97054046e-01, -2.18036272e-01, -6.97054046e-01]
我试图散点绘制它：
plt.scatter(a, b, alpha=0.7)
我想知道为什么它只绘制了大约 25-30 个点，而不是全部的 75 个点。我也不理解为什么有些点的颜色不同。
英文:
I have a set of points:
a = [0.61561561, 1.24828584, 0.15447159, 0.94014534, 1.24828584,1.24828584, 0.92375611, 0.92375611, 0.47900132, 0.52270525,0.61561561, 0.47900132, 0.47900132, 0.3984379 , 0.3984379 ,-0.75793657, -0.2629685 , 0.36970173, 0.36970173, -0.75793657,-0.66502621, -0.20388219, -0.06270612, 0.94014534, 0.61561561,-0.66502621, -0.86528859, -0.86528859, -0.86528859, -0.54075886,-0.12331877, 0.045172 , -0.20388219, -0.91880682, 0.15447159,-0.06270612, 0.47900132, 0.47900132, 0.92375611, -1.0824663 ,-0.86528859, -0.40414457, 0.01329552, 0.01329552, -0.86528859,0.01329552, -0.86528859, 1.24828584, -0.91880682, -0.12331877,0.83084575, 0.3984379 , 0.3984379 , 0.94014534, -0.20388219,0.83084575, -0.29679254, -0.86528859, -0.75793657, -0.12331877,0.36970173, 0.12064755, -0.86528859, -1.0824663 , -0.4478485 ,-0.86528859, 0.06156123, 0.94014534, -1.0824663 , -0.20388219,-1.0824663 , 0.01329552, 0.01329552, -0.4478485 , 0.01329552]b = [-5.02614441e-01, 2.52924699e-01, -2.35966674e-02, -1.25032819e-04,2.52924699e-01, 2.52924699e-01, -2.49564710e-01, -2.49564710e-01,4.78892741e-01, 5.21987286e-01, -5.02614441e-01, 4.78892741e-01,4.78892741e-01, -8.80642424e-01, -8.80642424e-01, 4.28537473e-01,4.98515651e-01, 1.25405479e+00, 1.25405479e+00, 4.28537473e-01,-5.96064254e-01, -1.07508203e+00, -4.01624650e-01, -1.25032819e-04,-5.02614441e-01, -5.96064254e-01, 3.04076047e-01, 3.04076047e-01,3.04076047e-01, 8.06565455e-01, 2.84453137e-01, 7.51565383e-01,-1.07508203e+00, 3.30514875e-01, -2.35966674e-02, -4.01624650e-01,4.78892741e-01, 4.78892741e-01, -2.49564710e-01, -7.39519357e-02,3.04076047e-01, -1.74941727e-01, -6.97054046e-01, -6.97054046e-01,3.04076047e-01, -6.97054046e-01, 3.04076047e-01, 2.52924699e-01,3.30514875e-01, 2.84453137e-01, 7.75037017e-01, -8.80642424e-01,-8.80642424e-01, -1.25032819e-04, -1.07508203e+00, 7.75037017e-01,-5.04803011e-02, 3.04076047e-01, 4.28537473e-01, 2.84453137e-01,1.25405479e+00, -5.72592620e-01, 3.04076047e-01, -7.39519357e-02,-2.18036272e-01, 3.04076047e-01, 1.00100506e+00, -1.25032819e-04,-7.39519357e-02, -1.07508203e+00, -7.39519357e-02, -6.97054046e-01,-6.97054046e-01, -2.18036272e-01, -6.97054046e-01]
which I try to scatter plot:
plt.scatter(a, b, alpha=0.7)
And was wondering why it only plots around 25-30 points among the 75. I also don't understand why some points have different shades.
答案1
得分: 3
你一遍又一遍地绘制相同的数值。颜色变化是因为你使用了alpha=0.7，所以较暗的点是更多点叠加在一起的地方。
zipped = list(zip(a, b))print(len(zipped)) # 75print(len(set(zipped))) # 27
集合创建一个没有重复的集合，所以在这种情况下，你只有27对唯一的值。
英文:
You're plotting the same values over and over again. The colour changes because you're using alpha=0.7, so the darker points are where more points have been plotted on top of each other.
zipped = list(zip(a, b))print(len(zipped)) # 75print(len(set(zipped))) # 27
Set creates a collection without duplicates, so in this case you only have 27 unique pairs.
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