How can I make a reaction surface using kriging? Also, how can I get a value other than the data value?

How can I make a reaction surface using kriging? Also, how can I get a value other than the data value?

x1 = [4.158236141 6.153599506 -4.535940798 7.598349019 1.546377884 -1.345068203 9.996482015 -0.173832303 -4.963945249 7.601915038 6.858088405 6.026235301 3.704288407 3.26674903 3.077538527 3.32612663 3.171101989 9.937861391 9.863387191 -4.925131257]
x2 = [2.015908909 12.95555116 11.95848613 6.917196588 9.949209037 2.568895989 0.600398657 14.98330222 6.845564827 3.014910507 0.181581313 2.019090607 2.012738027 2.016006495 0 5.08610712 2.193143018 10.52404152 14.64506378 0.388181645]
v = [5.107328283 160.1220683 23.67014797 43.25143692 47.46188065 45.85372988 7.680346552 95.19501237 117.2067804 15.11163604 19.01778002 20.13095512 1.896743409 0.499697271 5.825451311 9.267063133 0.405543669 59.12461059 139.9629599 287.0573273]

When x1=1, x2=5, I want to get the value value using kriging. Not scatteredInterpolant.

krigingToolbox

https://kr.mathworks.com/matlabcentral/fileexchange/59960-krigingtoolbox?s_tid=srchtitle

kriging

https://kr.mathworks.com/matlabcentral/fileexchange/57133-kriging-x-y-z-range-sill?s_tid=srchtitle

Ordinary Kriging

https://kr.mathworks.com/matlabcentral/fileexchange/29025-ordinary-kriging

Please let me know!!