Replacing values in array with values from another array
显示 更早的评论
The values in each row of an array correspond to the values i, j of an upper triangular array. How do I return a vector with elements that are the corresponding i, j value in the array? For example:
test_array = [1 2; 2 3; 1 3];
test_upper_triangular_array = [0.5 0.25 0.7; 0 0.8 0.6; 0 0 1.1];
desired_vector = [0.25 0.6 0.7]
采纳的回答
Try this —
test_array = [1 2; 2 3; 1 3];
test_upper_triangular_array = [0.5 0.25 0.7; 0 0.8 0.6; 0 0 1.1]
lidx = sub2ind(size(test_upper_triangular_array), test_array(:,1), test_array(:,2)) % Convert Subscripts To Linear Indices
result = test_upper_triangular_array(lidx)
% desired_vector = [0.25 0.6 0.7]
EDIT —
Transpose to get row vector:
result_row = result.'
.
3 个评论
KALYAN ACHARJYA
2022-7-17
@L'O.G. Other ways: Using Loop
L'O.G.
2022-7-17
Star Strider
2022-7-17
As always, my pleasure!
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