Hey, is there some function like griddata which doesnt interpolate the z data? I need some function to save all z values or the mean in the specific x,y segment. Thanks for you help!

How to create 3D grid from data without interpolation?

José-Luis 2016-7-4

编辑：José-Luis 2016-7-4

If you don't interpolate, then how do you get the data? Taking the mean is pretty much a linear interpolation, if I understood what you meant correctly.

wkm42 2016-7-4

I have x,y,z datapoints and would like to sort them in x,y segments. So the function i'm looking for could save all the z datapoints in the x,y segments or just their mean value.

wkm42 2016-7-4

编辑：wkm42 2016-7-4

在 MATLAB Online 中打开

For example:

Datapoints:
x: torque = [12,13,20,30]
y: speed = [512,800,1300,1506]
z: z = [2,2,1,4]
Intervalls of my desired grid:
torque_intervall = [10,20,30]
speed_intervall = [500,1000,1500,2000]
The function im looking for:
output = gridfunc(torque,speed,z,torque_intervall,speed_intervall)
output(torque=10..20,speed=500..1000)= [z(1),z(2)]
or
output(torque=10..20,speed=500..1000)= mean([z(1),z(2)])

José-Luis 2016-7-4

Sorry, I don't get it.

How do you define your brackets?

What is the result you expect? Why [2,2]?

wkm42 2016-7-4

I edited my example above and hope its reasonable now ;)

Your suggestion 'linear interpolation' is kinda what I'm looking for, but still griddata interpolates outside of the datapoints and misses some of the datapoints inside the grid..

José-Luis 2016-7-4

That still looks like interpolation to me. It looks like you might want to find the nearest neighbor.

wkm42 2016-7-4

编辑：wkm42 2016-7-4

Still 'griddata' interpolates when there are no datapoints, but doesn't when there are..

José-Luis 2016-7-4

Then don't use griddata().

interp2() might provide what you need.

Did you actually look at the nearest neighbor solution I previously suggested?

wkm42 2016-7-4

Yes, but nearest neighbor doesnt seem to be a solution..

interp2(): If X and Y are grid vectors, then V must be a matrix containing length(Y) rows and length(X) columns.

I just got z as a vector

José-Luis 2016-7-5

I'm sorry: I don't quite get what you are after. Maybe try the 'nearest' option for griddata()?

How to create 3D grid from data without interpolation?

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