Replacing values in array with values from another array

4 次查看（过去 30 天）
L'O.G.
L'O.G. 2022-7-17
评论： Star Strider 2022-7-17
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]

请先登录，再回答此问题。

采纳的回答

Star Strider
Star Strider 2022-7-17
编辑：Star Strider 2022-7-17
Ran in:
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]
test_upper_triangular_array = 3×3
0.5000 0.2500 0.7000 0 0.8000 0.6000 0 0 1.1000
lidx = sub2ind(size(test_upper_triangular_array), test_array(:,1), test_array(:,2)) % Convert Subscripts To Linear Indices
lidx = 3×1
4 8 7
result = test_upper_triangular_array(lidx)
result = 3×1
0.2500 0.6000 0.7000
% desired_vector = [0.25 0.6 0.7]
EDIT —
Transpose to get row vector:
result_row = result.'
result_row = 1×3
0.2500 0.6000 0.7000
.

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Line Plots 的更多信息

标签

产品


版本

R2021b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by