extract matrix from matrix with the values of the axis

x=linspace(0,8,91);

y=linspace(1,3,56);

I have a matrix DL1 (91x46) and need to extract DL2 =DL1(DL1<=2) and the values of the x and y axis from DL1 corresponding to DL2.

Please help

Answer 1

[KSSV]

[m,n]  =size(DL1)
x=linspace(0,8,n);
y=linspace(1,3,m);
[X,Y] = meshgrid(x,y) ; 
%
idx = DL1<2 ; 
idx = idx' ; 
iwant = [X(idx) Y(idx)]

[Asliddin Komilov]

I have pasted it into command window, it says:

Index exceeds matrix dimensions.

[KSSV]

Missed one line in the code......edited the answer.

[Asliddin Komilov]

thanks, you have saved me a lot of time

[Asliddin Komilov]

uups, how come DL2 =DL1(DL1<=2) becomes an array, how do I keep it as a matrix?

[KSSV]

You cannot keep it as a matrix..it will become a vector. If you want it to be matrix,, the option is make other elements NaN's.

idx = DL1<=2 ;
DL2 = DL1 ;
DL2(~idx) = NaN ; 

[Asliddin Komilov]

isn't possible to extract values of DL1 corresponding to X(idx) and Y(idx) in shape of a matrix?

[Asliddin Komilov]

or extract x and y values for the none NaN part of the DL2?

[KSSV]

X(~idx) = NaN ; 
Y(~idx) = NaN ;