How to alter nearby values in a matrix with respect to a column?

Question

Hems 2018-4-13

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/394724-how-to-alter-nearby-values-in-a-matrix-with-respect-to-a-column

评论： Hems 2018-4-13

Hi, I have a 2D matrix A(1:100,1:100), and I replaced one of its column (A(1:100,50)) with another column vector Y(1:100,1). Now I want the nearby columns in A to vary gradually with respect to the values in Y. Is it possible to do this in matlab? Thanks.

2 个评论
显示无隐藏无

Bob Thompson 2018-4-13

What do you mean by "vary gradually with respect to the values in Y"? What kind of variance are you looking for? It is entirely possible to adjust the values of A with respect to the new values from Y, but the how is dependent on the type of variance you're looking to perform.

Hems 2018-4-13

Thanks for your answer. After I replaced a column of my matrix, I can see an abrupt change in the values on either side of the replaced column, when I plot it as an image. For my purpose it doesn't matter what type of variance it is, as long as there is no abrupt change in the 2D image. Thanks.

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Jan 2018-4-13

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/394724-how-to-alter-nearby-values-in-a-matrix-with-respect-to-a-column#answer_314974

在 MATLAB Online 中打开

A       = rand(10, 10);  % smaller test data
A(:, 5) = 10 * rand(10, 1);
A(:, 4) = (A(:, 5) +     A(:, 4)) / 2;
A(:, 6) = (A(:, 5) +     A(:, 6)) / 2;
A(:, 3) = (A(:, 5) + 2 * A(:, 3)) / 3;
A(:, 7) = (A(:, 5) + 2 * A(:, 7)) / 3;

Now the direct neighbors contain the mean between the inserted column and the original data, while the 2nd neighbors contain the weighted mean.

There is an infinite number of other ways for a gradual variation. So please explain, what you exactly need.