griddata Parameter must be a 'double matrix'

I am running version R2011b. I am trying to re-grid data from an irregular lat/lon grid to a regular lat/lon grid. My input arrays X, Y, Z are dimensioned (349,277). My target grid is dimensioned (96,60). When griddata is called I get an error in DelaunayTri as "Parameter must be a 'double matrix'". I have used griddata in the past with no problems and I can not figure out what this error message means. Any suggestions?

Answer 1

[Sean de Wolski]

What is the class of the variables?

class(X)

If it's not double, convert it to double using double()

[enrique acuña]

Thanks, I had the same problem and I managed to solve it with your answer. Cheers

Answer 2

[Mike]

Thanks Sean, that was the problem. Simple now that I understand the error message!