polyfit not plotting, all arrays verified

[dmaynard]

I am trying to get a polyfit curve from attached excel data, page 12. Data points read in fine and plot. I am getting a plotting error when I try to graph the polyfit function. Using Mathcad Prime 3.1. My goal is to generate an equation that approximates the data points for use in control scheme. I will need to display the coefficients as well. Thank you in advance for your assistance.

[ValeryOchkov]

May be this help you

[dmaynard]

Sorry, look at page 12 for the error location.

[ValeryOchkov]

---

@dmaynard wrote:

Sorry, look at page 12 for the error location.

---

Sorry but I see only 11 pages!

And I think you not correct plot two vectors and one function. See please my picture!

Sorry - I go to bet...

[dmaynard]

I corrected the upload.

[dmaynard]

That particular plot I will be using piecewise functions later on for comparison. Not worried about it right now.

[Fred_Kohlhepp · Accepted solution]

I had to fake your time data, couldn't figure out what [@normal] meant.

But polyfit works.  You can see coefficients with polyfitc

[dmaynard]

I am trying to replicate your plot but I am still unable. Plot is still failing and I do not understand why.

[dmaynard]

Nevermind, I figured it out. I had to create second array for polyfit plot points. Thank you. I appreciate all the help.