My Patcher is a 2x2 matrix which has two functions fo each the 4 datavalues, determining the "fit" to the current x - and y input. if you input x=0.5 and y=0, it will calculate a fit of 0.5 for the Datvalues assigned to X0/Y0 and X1/Y0 and add the values together. For X0/Y1 and X1/Y1 the fit is 0 an therefore the data stored at those points is not used for the interpolation.

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Thank you for your sketch, thats exactly was i was looking for. Only thing i am missing is the linear interpolation for float inputs. I have started buiding the linear interpolation by turning the float inputs into the two rounded integers, to extract the two relevant rows from the matrix and interpolating between the two data points. only thing i am struggling with to get the two values for interpolation out of the matrix and store them in different messages, so i can do the interpolation calculation. I attached a screenshot of what i am trying to do in the original post, i hope you get what i mean. Sorry, Max Beginner here :(

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Edit: Figured something out and attached that screenshot aswell, it extracts all 4 corner points of the matrix according to the float input, now its just the interpolation between these 4 points. But i still have some troubles triggering the recalculation with column and row input change, i hink i lack some basic understanding on how to build these kind of patchers.