Legend - set legend to 2 group of data

Hello I have two data (52,60 lines on plot) I want to have a legend like this

LINES 1 - colour blue 

LINES 2 - colour red

But all the time I get the same blue colour because my legend count lines not the group of data . How to set it or skip values ?

I tried to do this like this :

ik=[X(M,N-1),X(M,N),X(M,N+1)];
h1=plot(ik,DataX,'-b');
hold on;
h2=plot(ik,DataY,'-r');
legend([h1 h2],{'ROI2','ROI3'}

??? Error using ==> horzcat
CAT arguments dimensions are not consistent.

M,N are single numbers eg. 100 (index)

Answer 1

[dpb]

Apparently Data[X|Y] have differing number of columns so since plot returns a column vector of line handles then [h1 h2] is trying to place to columns of different lengths side-by-side.

Use

[h1; h2]

or

[h1' h2']

instead.