how to correctly skip elements of a vector field table with 4 columns

INTRO: I have a vector field table build of 4 columns: the first two columns are the x and y coordinates, respectively and the last two columns are the x and y components, respectively. For instance, I created this vector field table with the command lines below:

%**********************    CREATE XY COORDINATES    ***********************

xvector = 1:1:10;

yvector = 1:1:10;

numX = numel(xvector);  

numY = numel(yvector);

yvector = repmat(yvector(:),numX,1);

xvector = repmat(xvector   ,numY,1);

XY_C = [xvector(:) yvector];

%**********************       CREATE XY COMPONENTS       ************************

a=(1:1:100);

x=2*a';

y=5*a';

%************************    VECTOR_FIELD TABLE   ****************************

V=[XY_C x y];

%**************************************************************************

Thus, there are hundred pairs of coordinates and there is an associated x and y component for each pair.

GOAL:

Assume the vector field table is given from elsewhere but is similar as above.I want to build a new vector field table by excluding elements from the original table. To do so, I wrote the following lines:

%**************************    EXCLUDE ELEMENTS    ***************************

SKIP=2;

V_SKIP=V(0+SKIP:SKIP:end,:);

%**************************************************************************

RESULTS and PROBLEM: If you run the command lines above, you will see that the new vector field table has excluded elements only along the y-coordinate while the elements of the x-coordinates are all there.

INTENTION: I would appreciate if someone knows what I have to do to exclude the elements also along the x-coordinate. For the particular case above, the first 10 lines of the new table would be:

2  2  24  60

2  4  28  70

2  6  32  80

2  8  36  90

2  10  40  100

4  2  64  160

4  4  68  170

4  6  72  180

4  8  76  190

4  10  80  200

Thank you a lot in advance for help

Emerson

Answer 1

[Yoav Livneh]

Use this:

ix=mod(V(:,1),2)==0 & mod(V(:,2),2)==0;
V_SKIP = V(ix,:);

[Emerson De Souza]

Thank you Yoav,

this suggestion fixed the problem

Wish you a nice day

Emerson