I have an 120x70 matrix of wich i want to graph diagonal lines.

for ease of typing here, I will explain my problem with a smaller 4x4 matrix.

I now want to graph for example starting at 2021 index 0 so that i get the following diagonal numbers in a graphs: 2, 8, 10

or if i started at 2020 i would get 1, 5, 5, 4.

Kind regards!

CodePudding user response：

You can do this with a simple for-loop. e.g.:

matrix = np.array((120, 70))
graph_points = []
column_index = 0  # Change this to whatever column you want to start at
for i in range(matrix.shape[0]):
    graph_points.append(matrix[i, column_index])
    column_index  = 1
    if column_index >= matrix.shape[1]:
        break

## Plot graph_points here