标签：pen att otl known python版本 erro type create \n
python版本：3.6.5
opencv版本：3.2.0
使用的jupyter notebook
源码如下：
import cv2 import numpy as np import matplotlib.pyplot as plt %matplotlib inline # Feature set containing (x,y) values of 25 known/training data trainData = np.random.randint(0,100,(25,2)).astype(np.float32) # Labels each one either Red or Blue with numbers 0 and 1 responses = np.random.randint(0,2,(25,1)).astype(np.float32) # Take Red families and plot them red = trainData[responses.ravel()==0] plt.scatter(red[:,0],red[:,1],80,‘r‘,‘^‘) # Take Blue families and plot them blue = trainData[responses.ravel()==1] plt.scatter(blue[:,0],blue[:,1],80,‘b‘,‘s‘) # plt.show() newcomer = np.random.randint(0,100,(1,2)).astype(np.float32) plt.scatter(newcomer[:,0],newcomer[:,1],80,‘g‘,‘o‘) knn = cv2.ml.KNearest_create() knn.train(trainData,responses) ret, results, neighbours ,dist = knn.findNearest(newcomer, 3) print ("result: ", results,"\n") print ("neighbours: ", neighbours,"\n") print ("distance: ", dist) plt.show()
错误如下：
--------------------------------------------------------------------------- TypeError Traceback (most recent call last) <ipython-input-21-b1c5cdca5e57> in <module>() 20 knn = cv2.ml.KNearest_create() 21 ---> 22 knn.train(trainData,responses) 23 ret, results, neighbours ,dist = knn.findNearest(newcomer, 3) 24 TypeError: only size-1 arrays can be converted to Python scalars
错误原因：
传递的参数错误
train函数中第二个参数应该是数组的布局方式
应该根据传入数组的形式填cv2.ml.ROW_SAMPLE或者cv2.ml.COL_SAMPLE
例如我的就是
knn.train(trainData,cv2.ml.ROW_SAMPLE，responses)
参考地址：https://stackoverflow.com/questions/33975695/type-error-only-length-1-arrays-can-be-converted-to-python-scalars
only size-1 arrays can be converted to Python scalars
标签：pen att otl known python版本 erro type create \n
原文地址：https://www.cnblogs.com/Summerio/p/9723099.html
