Question

此函数未正确将文件转换为矩阵，而我运行代码时却收到错误消息： returnMat [index ,:] = listFromLine [0：3]

ValueError：无法将字符串转换为浮点数。

def fileToMatrix(filename):
        fr = open(filename)
        numberOfLines = len(fr.readlines())
        returnMat = np.zeros((numberOfLines,3))
        classLabelVector = []
        fr = open(filename)
        index = 0 
        for line in fr.readline():
            line = line.strip() #split in the end of the line
            listFromLine = line.split('\t') # split on tab and make list
            returnMat[index,:] = listFromLine[0:3]
            classLabelVector.append(int(listFromLine[-1]))
            index += 1

        return returnMat, classLabelVector



    if __name__ == '__main__':

        filename ="mydata.txt"
        returnMat,classLabelVector=fileToMatrix(filename)
        print(returnMat)

和数据文件如下：

enter image description here

Answer 1

哈哈...错误所在的行：

for line in fr.readline():

我应该使用readlines（）函数读取.txt文件的所有行

无法将字符串转换为浮点数：

1 个答案: