Problems with Newton Raphson zero Finder

Hey all,.

I am trying to solve an equation with Newton Raphson zero Finder, but I can't get a result out of it, with this data set. It works with other sets of data, that I tried, and I solved this instance of the equation with another program and got the result I wanted (about 20), but for some reason, I have solve difficulties in Labview. I have attached my VI and the data that I use. This is what the formula, entering the Finder VI zero is supposed to look like:
((t * ((0.05594 * t + 5.2842) * t + 137.37)) / (1000 *(t+246))) - 1.987512E - 2
As I said, I get the result I want, when I solve for this specific instance of the formula with another program, so I know that the formula is correct.

Please let me know if you have an overview

When you say it looks like the right place for zero, he returned to 19.94484, which seems to be about 20.

1. connecting an indicator to the Newton Raphson zero error output Finder.vi gives-23021: two function values have the same sign. Automatic error handling does not pick up screws errors that have no deviation of the clusters. This error indicates that the zero is that not between the search terms or there are several zeros in this range.

2. the default start and end values are 0 and 1. End changing to 100 product the result above. It seems that another zero 246 so that you can't do the limits too far.

It is often useful to view data. Plot the data and the results of the formulas on the graphs to see what is happening. Using Eval Single-Variable Array.vi I get this:

Note that it shows two passages to zero.

Although it doesn't seem to be a problem here, with very large or very small values can lead to digital errors of overflow, underflow or retransmit.  Multiplying your table of spectrum and the initial settings by 1E23 and then later by dividing by the same factor (if necessary) could help avoid such problems.

Lynn

Tags: NI Software

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