How do I get values of a certain parameter in a multi-dimensional matrix?

1 次查看（过去 30 天）
Leon
Leon 2021-11-30
评论： Steven Lord 2021-11-30
A is a variable with the size of 1000 x 500.
% Index of those that are less than 10000
Ind = A < 10000;
Why does the below give me a 500000 x 1 column data, instead of a 1000 x 500 matrix?
b = a(Ind);
What did I do wrong? How do I get the correct b with the size of 1000 x 500?

请先登录，再回答此问题。

采纳的回答

Stephen23
Stephen23 2021-11-30
a(~Ind) = NaN

更多回答（1 个）

Matt J
Matt J 2021-11-30
b should be an Nx1 vector where N is the number of elements satisfying A<10000.
  6 个评论
显示 4更早的评论
Steven Lord
Steven Lord 2021-11-30
Ran in:
You could also use standardizeMissing.
M = 9e26;
format shortg
A = [4 8 M 15 M M; 16 23 42 M M M]
A = 2×6
1.0e+00 * 4 8 9e+26 15 9e+26 9e+26 16 23 42 9e+26 9e+26 9e+26
B = standardizeMissing(A, M)
B = 2×6
4 8 NaN 15 NaN NaN 16 23 42 NaN NaN NaN

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Matrix Indexing 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