如何在python中将多个矩阵写入文本文件？

Question

I have a for loop creating a matrix every time and I need to write all the matrices to a text file

I used np.savetxt()in the for loop, but in the end, the textfile only shows the last matrix I created.

Does anyone know what happened?

file = open("newfile.txt", "w")
for i in range (0,5):
    matrix = numpy.zeros((5, 5)) 
    np.savetxt(file, matrix)
file.close()

Answer 1

You need use ba other than w when you append a numpy array into a csv file. b is binary mode Without b your code will have type error. Tested on python3.5

Answer 2

您必须以追加模式打开文件：

file = open("newfile.txt", "a")

Answer 3

标志“ w”导致文件被忽略，您应该使用“ a”进行追加。