
how to make input size the same as output in interp2
Posted:
Jan 25, 2013 12:34 PM


Hello all, I have a problem. I have the following scipt to make 2D interpolation of some function fu(x,y) = x^2yy^2x. There is no problem if both x and y are scalars. However, if I call fuint with x scalar and y row vector for example, the output is column vector. also, if I call fuint with x column vector and y scalar, the output is row vector. see the two lines in which I write comment %>problem here. The problem is that, quadgk can't integrate @(y) fuint(3,y), because input size is not the same as output. how should I modify this such that the size of the output is the same as input, if either x or y is scalar? Thanx ==========================================
clear all
xcoba = linspace(5,5,50); ycoba = linspace(5,5,50);
fu = @(x,y) x.^2.*y  y.^2.*x;
[xgrid,ygrid] = ndgrid(xcoba,ycoba);
fugrid = fu(xgrid,ygrid);
fuint = @(x,y) interp2(xgrid',ygrid',fugrid',x,y,'cubic',NaN);
fuint(1,[2,3,4]) %> problem here
fuint([2;3;4],1) %> problem here
quadgk(@(y) fuint(3,y), 3,3)
=======================================

