2D adapt: a question to Mr altenbach

Dear Altenbach,

I started looking at all your posts on form 2d (the oldest is in 2004) and I downloaded all the files 2Dquadratic, planefit, 2Dscatterfit2, 3Dpolyfit, XuFit_004. Also, I read this https://decibel.ni.com/content/docs/DOC-30394

Ok... I'm completely lost.

I would ask you where your files, I should start. I want to ride with the function z = a + bx + cx * 2 + dy + ey * 2 + fxy (second order polynamial) a set of experimental data (x, y, z are the experimental data, these are all vectors 1 d with the same dimension, in addition, they are very large vectors on the 100000 entries each).

I did not understand:

(1) what is the difference between mesh and scattered data.

(2) If you are suggesting the polynomial form (build the H matrix) or climb the Mar Lev.

I also ask you if there are more recent vi from, because the 'old' are very very difficult to understand.

Thanks in advance

Use the most recent one. Some of the old examples use homemade, pre LabVIEW 8.0 subroutines.  Editing tools has received a major overhaul with LabVIEW 8.0 and should be used out of the box.

gnappo wrote:

I would ask you where your files, I should start. I want to ride with the function z = a + bx + cx * 2 + dy + ey * 2 + fxy (second order polynamial) a set of experimental data (x, y, z are the experimental data, these are all vectors 1 d with the same dimension, in addition, they are very large vectors on the 100000 entries each).

Because your problem is linear in coefficients, you must use the general linear adjustment, building the matrix H of the terms. No need of iterative procedures such a lev - mar. create your H matrix with various conditions for each pair of xy.

Gridded data mans that x and y values form a rectangular grid with no missing values, i.e. the 2D data can be represented as a simple 2D array. The scattered data means that there is a list of (x, y, z) points and x and there is not evenly spaced. You can run this in both modes to immediately see the difference.

Tags: NI Software

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