[R] convert point data to grid

[uday]

I would like to convert my point data to grid data 

my data contains e.g 

lat   <-  c(25.1618 , 24.8664, 21.0575,  21.1537,  21.2477, 21.3403, 
20.7617,  20.8577,  20.9516, 21.0443)
lon  <-  c(55.7660, 55.6890, 54.7205, 54.2142, 53.7105,53.2053, 54.6470,
54.1419, 53.6389, 53.1348)
z      <-  c(  1758.935, 1758.935, 1751.755, 1751.755, 1751.755, 1751.755,
1751.754, 1751.754,1751.754, 1751.754) 
I have tried 
pts = expand.grid(x, y,z)
grd.pts = SpatialPixels(SpatialPoints(pts)) > summary(grd.pts)

but I get error 

suggested tolerance minimum: 0.796296 
Error in points2grid(points, tolerance, round) : 
  dimension 1 : coordinate intervals are not constant


My final objective is that I want this data on 5 x 4 grid , so how I can
grid  this data ? 


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