Get error for fit function (surface) in matlab2021

Hello

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

K=readtable('TEMPLDFC.xlsx');

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'.

[Walter Roberson]

whos x y z
which fit

Please show us the results of the above

[Torkan]

Thanks. Attached

surface fit

consider x y z as a double

x= [1;2;3;4;5]

y=[2;3;4;6;7];

z=[2;6;8;10;34];

These are arbitrary I have my excel file where I read my data

[Torkan]

Answer 1

[Walter Roberson]

I suspect that you do not have the Curve Fitting Toolbox installed.

[Torkan]

Hmm. Ok so no problem with the code right? Can I install myself? could you pelase let me know how?