How can I change all the elements in a matrix with value1 to a new value2?

1 次查看（过去 30 天）

显示更早的评论

Michelle Clements 2020-10-15

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/614738-how-can-i-change-all-the-elements-in-a-matrix-with-value1-to-a-new-value2

编辑： Ameer Hamza 2020-10-15

I have a 78X78 binary matrix. How can I change all the 0s to -1s?

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

回答（2 个）

Torsten K 2020-10-15

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/614738-how-can-i-change-all-the-elements-in-a-matrix-with-value1-to-a-new-value2#answer_514698

在 MATLAB Online 中打开

How about this?

m = randi([0,1],78) % 78x78 matrix with random integers in the interval 0..1
m(m==0)=-1 % Substitute all 0's b -1's

Best regards

Torsten

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

Ameer Hamza 2020-10-15

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/614738-how-can-i-change-all-the-elements-in-a-matrix-with-value1-to-a-new-value2#answer_514803

编辑：Ameer Hamza 2020-10-15

在 MATLAB Online 中打开

Another approach

M; % 78x78 matrix
M_new = 2*M-1;

This will be faster as compared to the indexing approach.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

类别

MATLAB Language Fundamentals Matrices and Arrays Creating and Concatenating Matrices

在 Help Center 和 File Exchange 中查找有关 Creating and Concatenating Matrices 的更多信息

标签

Community Treasure Hunt

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

Translated by