双线性插值，0.1度插值成0.025度，大神看看出错原因

蕊蕊

fil1 = ('3B-DAY.MS.MRG.3IMERG.20140420-S000000-E235959.V04.nc4');
prep=ncread(fil1,'precipitationCal');
lat=ncread(fil1,'lat');
lon=ncread(fil1,'lon');
[xx,yy]=meshgrid(lat,lon);
x=-89.95:0.025:89.95;
y=-179.95:0.025:179.95;
[xi,yi]=meshgrid(x,y);
vq=interp2(xx,yy,prep,xi,yi);



error：
Error using griddedInterpolant
The grid vectors do not define a grid of points that match the given values.

Error in interp2>makegriddedinterp (line 228)
    F = griddedInterpolant(varargin{:});

Error in interp2 (line 136)
        F = makegriddedinterp(X, Y, V, method,extrap);

Error in bilinear (line 9)
vq=interp2(xx,yy,prep,xi,yi);