How to set just RowNames in a Matrix

Hello, Let's assume I got a matrix 3x3

A = [1,2,3;4,5,6;7,8,9];
A.Properties.RowNames = {'row1','row2','row3'};

I got an error Field Assignment to a non-structure array object.

I just wanted to place names in rows and not to create a table. I want to keep as a double if possible.

Answer 1

[Birdman]

Since you do not want to use table, which is really smart to use, I would suggest you to use cell array.

A=mat2cell(A,ones(1,size(A,1)),ones(1,size(A,2)));
A(:,2:end+1)=A(:,1:end);
A(:,1)={'row1','row2','row3'};

and it is easy to reach numeric content of the cell by typing

Anum=cell2mat(A(:,2:end))

[Tiago Dias]

I don't want to use a table for just a simple reason:

A = [1,2,3;4,5,6;7,8,9];
A = table(A);
A.Properties.RowNames = {'row1','row2','row3'};

It creates a table 3x1, and not a table 3x3 that was my goal

[Birdman]

Then,

B=table(A(:,1),A(:,2),A(:,3),'RowNames',{'row1','row2','row3'})

[Tiago Dias]

and it is possible to turn de variable names off? it shows me A1 A2 A3 etc

[Birdman]

It is not. It requires at least one nonempty character. And also as Stephen said below, array2table is also efficient and serves for you.

B=array2table(A,'RowNames',{'row1','row2','row3'})

Answer 2

[Stephen23]

"It creates a table 3x1, and not a table 3x3 that was my goal"

So use the correct function to create it: array2table

This will create a table of the size that you want.

Using a table will be much simpler than forcing a "header" into a cell array and splitting numeric data into separate cells of a cell array. A table is the correct data class if you want a header.