How to fix error about interp1?

I am getting this errors:

Error using griddedInterpolant. The grid vectors must contain unique points.

Error in interp1 (line 161)

F =griddedInterpolant(X,V,method)

Error in interpolation_diff (line 184)

ai_b = interp1(b(:,1), b(:,2),0:4095);

My code line is:

[r,c] = size(b); 
ai_b = interp1(b(:,1), b(:,2),0:4095);

Answer 1

[KSSV]

x = b(:,1) ; 
y = b(:,2) ; 
xi = linspace(min(x),max(x),4095)' ; 
ai_b = interp1(x,y,xi);

[Shital Inmulwar]

Thanks for the response.

It is showing an error as ' the input must be scalar for linspace '

[Shital Inmulwar]

Actually I have used same code for another material as well but for both I have loaded different mat files and then wrote the above stated code accordingly.

But it is showing error as:

Error using griddedInterpolant. The grid vectors must contain unique points.

[KSSV]

Type error..edited the code......If it works fine else attach your data.

[KSSV]

Without data how to run?