MATLAB: How can i interpolate A and B to get C at a range of instance of A and B

Question

A         B        C
1000  19,3  401,7   
1000  30,9  340,1   
1000  74,5  279,2   
1000  84,6  270,7   
1000  91,7  271    
1200  41,5  320,1   
1200  72,4  276,7   
1200  82,2  272,6   
1200  93,8  266,4   
1200  102,9  263,6   
1400  121  263,6   
1400  137  268,8

Answer 1

[num,txt,raw] = xlsread('Mappe2.xlsx') ;
x  = num(:,1) ; y = num(:,2) ; z = num(:,3) ;
N = 100 ;
[X,Y] = meshgrid(linspace(min(x),max(x),N),linspace(min(y),max(y),N)) ;
Z = griddata(x,y,z,X,Y) ;
surf(X,Y,Z);
shading interp  
hold on 
plot3(x,y,z,'.r')