Creating a new matrix and insert certain values into that matrix

Question

eko supriyadi 2021-8-30

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1442979-creating-a-new-matrix-and-insert-certain-values-into-that-matrix

评论： eko supriyadi 2021-9-2

Dear Matlab community

suppose i want make new matrix 4*4 and insert a value based on the row-column position of the matrix, and also if there is no value it is filled with nan.. any ideas to solve it?

the value where i want to insert are:

A(1,1) = 2 
A(3,1) = 2
A(3,1) = 2
A(2,3) = 4
A(2,4) = 2
A(3,1) = 3
A(3,2) = 3
A(4,1) = 2
A(3,4) = 1

and give the result:

A =
     2   NaN     3     2
   NaN   NaN     3   NaN
     2     4   NaN     1
     4     2   NaN   NaN

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Stephen23 2021-8-30

编辑：Stephen23 2021-8-30

Note that the indexing and values you show will NOT generate that "result" matrix.

As far as I can tell, half of the values in your results matrix are randomly placed.

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Stephen23 2021-8-30

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1442979-creating-a-new-matrix-and-insert-certain-values-into-that-matrix#answer_776704

在 MATLAB Online 中打开

I suspect that you are asking about SUB2IND:

R = [1,3,3,2,2,3,3,4,3];
C = [1,1,1,3,4,1,2,1,4];
V = [2,2,2,4,2,3,3,2,1];
M = nan(4,4);
M(sub2ind(size(M),R,C)) = V
M = 4×4
     2   NaN   NaN   NaN
   NaN   NaN     4     2
     3     3   NaN     1
     2   NaN   NaN   NaN