function [z] = cart2cyl(c,thetai,rhoi,varargin)
% z=cart2cyl(c,xi,yi);
%

NN=size(c);
%[theta rho nz]=size(c);
[x y nz]=size(c);
%[RHO,THETA] = meshgrid(1:rho,-pi+2*pi/theta:2*pi/theta:pi);
%[Y,X] = meshgrid(-(x-1)/2:(x-1)/2,-(y-1)/2:(y-1)/2);
%stepx=(2*x+1)/(2*x);
%stepy=(2*y+1)/(2*y);
stepx=(x+1)/(x);
stepy=(y+1)/(y);
[Y,X] = meshgrid(-(x)/2:stepx:(x)/2,-(y)/2:stepy:(y)/2);
%[Y,X] = meshgrid(x,y);
%[Y,X] = meshgrid(-(x)/2:stepx:(x)/2+stepx,-(y)/2:stepy:(y)/2+stepy);
%[x,y] = pol2cart(THETA,RHO);
[theta,rho] = cart2pol(X,Y);
%theta=(theta./(pi*2)+0.5).*size(thetai,2);
%theta=theta.*2*((size(thetai,2)+1)/size(thetai,2));
%theta=(theta./(pi*2)+0.5).*(size(thetai,2)+1);
%theta=(theta./(pi*2)+0.5).*(size(thetai,2));
theta=(theta./(pi*2)+0.5).*(size(thetai,2));
%theta=(theta./pi).*size(thetai,2);
%theta=(theta./(pi*2)).*size(thetai,2);
%rho=max(rhoi)*rho/((x-1)/2);
rho=max(rhoi)*rho/((x)/2);
%theta=rot90(theta.*180./pi,-1);
%[nx ny nz]=size(c);
%nx=theta;ny=rho;
ntheta=x;nrho=y;

%X=reshape(x,[1 nx*ny]);
%Y=reshape(y,[1 nx*ny]);
THETA=reshape(theta,[1 ntheta*nrho]);
RHO=reshape(rho,[1 ntheta*nrho]);
%del=griddata_preprocess(Y,X,yi,xi',varargin{:});
del=griddata_preprocess(RHO,THETA,rhoi,thetai',varargin{:});

for k=1:nz;
 C=reshape(c(:,:,k),[1 ntheta*nrho]);
z(:,:,k)=griddata(RHO,THETA,C,rhoi,thetai',varargin{:});
%z(:,:,k)=griddata(Y,X,C,yi,xi',varargin{:});
% z(:,:,k)=griddata_fast(del,[C C(il) C(ig)],varargin{:});
end % k

% Split vertical and time dimensions
if size(NN,2)>2
z=reshape(z,[size(z,1) size(z,2) NN(3:end)]);
end