repeat values within array

Hi,

I have an array, that I need to extend. In specific I need to repeat each value n times. n is the length of another vector. I can select the number of value that needs to be repeated and I can repeat it, but I can't append it to the other repeated values in my for loop. It only shows the repetition of the last value. My code is as followed:

X=[0.5;0.5;0.6;0.6];
Y=[0.6;0.7;0.6;0.7];
dx=0.05;
dy=0.05;
X_klein=[min(X):dx:max(X)]';
Y_klein=[min(Y):dy:max(Y)]';
for m=1:length(X_klein)
    XX=X_klein(m);
    XX1=repmat(XX,length(Y_klein),1);
    XX1(m)=[XX1(m);XX1];
   
end

Answer 1

[Rik]

You can edit your code using a cell array for the long way round:

X=[0.5;0.5;0.6;0.6];
Y=[0.6;0.7;0.6;0.7];
dx=0.05;
dy=0.05;
X_klein=[min(X):dx:max(X)]';
Y_klein=[min(Y):dy:max(Y)]';
XX1=cell(1,numel(X_klein));
for m=1:numel(X_klein)
    XX=X_klein(m);
    XX1{m}=repmat(XX,numel(Y_klein),1);
end
XX1=cell2mat(XX1);
disp(XX1)

    0.5000    0.5500    0.6000
    0.5000    0.5500    0.6000
    0.5000    0.5500    0.6000

Or use meshgrid for the shorter way:

[XX1,YY1]=meshgrid(X_klein,Y_klein);
disp(XX1)

    0.5000    0.5500    0.6000
    0.5000    0.5500    0.6000
    0.5000    0.5500    0.6000

[Kati]

Thanks, but I need it in one row vector like XX1=[0.5;0.5;0.5;0.55;0.55;0.55;0.6;0.6;0.6]. Your solution displays a matrix. Do you know a way to build the vector?

[Rik]

You can either serialize the output of meshgrid, or change the shape of XX1 when pre-allocating the cell.

[Kati]

I'm sorry, I still don't understand it. It's always the 3x3 matrix, but I need it in 9x1..

[Kati]

I solved it.Thank you for your help!