Extracting data values from MATLAB meshgrid output -

i need extract data values particular coordinate meshgrid in matlab, code following:

paarx=paar(:,1); paarx1=paarx(1:20:length(paarx)); paary=paar(:,2); paary1=paary(1:20:length(paary)); x=paarx; y=paary; v=paar(:,3); [xi, yi]=meshgrid(paarx1, paary1); vq=griddata(x, y, v, xi, yi, 'cubic'); 

the paarx, paary , v x, y , z values of surface, z values values interpolated. paarx1 , paary1 values used in meshgrid every 20th value taken (the array large before this). need extract interpolated z values in vq particular x , y coordinates.

as understood question, need this:

nx = 3; % <= length(paarx1) ny = 4; % <= length(paary1) fprintf('the interpolated value @ x=%g , y=%g %g',paarx1(nx),paary1(ny),vq(ny,nx)) 

or can transpose matrix vq

vq = vq.'; fprintf('the interpolated value @ x=%g , y=%g %g',paarx1(nx),paary1(ny),vq(nx,ny)) 

vq(ny,nx) (y first) because use meshgrid function. can use access matrix element in form vq(nx,ny) (x first) ndgrid function (but i'm not sure works griddata).