[英]From a sparse to dense representation of matrix in python
I have a list of vectors in python with 3 values with represent a sparse matrix. 我在python中有一个向量列表,其中3个值代表一个稀疏矩阵。 In fact the first values are the indexes of a 2d array (30 is the max value for the first index s and 9 the max value for the second index) and the third elements is the values of the matrix.
实际上,第一值是2d数组的索引(30是第一索引s的最大值,而9是第二索引s的最大值),第三元素是矩阵的值。 How can I calculate the denserepresantation of the matrix 30x9 from that list?
如何从该列表中计算矩阵30x9的密集表示? My data has the following structure:
我的数据具有以下结构:
> [1, 1, 4],
[1, 4, 2],
[1, 6, 1],
[1, 8, 5],
....
[31, 9, 6],
...
I want a matrix with rows to be from 1-31 and columns index to be from 1-9 and the values of the matrix to be the third value of the vectors. 我想要一个矩阵,其中行从1到31,列索引从1到9,矩阵的值是向量的第三个值。 In the end I want to perform NMF in the dataset found here .
最后,我想在此处找到的数据集中执行NMF。
You can try this: 您可以尝试以下方法:
vectors = [[1,1,2],[2,4,6],[31,2,8]]
tab=[[0 for col in range(9)] for row in range(31)]
for x in vectors:
tab[x[0]-1][x[1]-1] = x[2]
print tab
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