I have sparse data from an image that is 5202x3464 (around 150 points).
I have interpolated that to a set of data values for every tenth pixel I.e. 0, 9, 19, -- 5209) on the x Axis and similarly 0, 9, 19 -- 3469 for the y axis.
I chose to do that as trying to interpolate to a completely filled matrix of data values was far, far too slow.
Now I come to display the data I don't see a filled colour map, but lots of points for the values I have computed.
Do I really need to compute all the values? Or is there a neat way to compute a matrix of values that is 521 wide and 347 high and display it with x/y scales for 10x that actual values??
Thanks, David