Get error for fit function (surface) in matlab2021

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I have some data I want to use my code but in matlab2021 it does not work. any idea? It could read data but fit does not wok.
clear all
x = K.(1) ;
y = K.(2) ;
z = K.(3);
f = fit([x y],z,"poly23");
Check for incorrect argument data type or missing argument in call to function 'fit'.
Torkan on 7 Apr 2022
Edited: Torkan on 7 Apr 2022
Thanks. Attached
surface fit
consider x y z as a double
x= [1;2;3;4;5]
These are arbitrary I have my excel file where I read my data

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Answers (1)

Walter Roberson
Walter Roberson on 7 Apr 2022
I suspect that you do not have the Curve Fitting Toolbox installed.
  1 Comment
Torkan on 7 Apr 2022
Hmm. Ok so no problem with the code right? Can I install myself? could you pelase let me know how?

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