MATLAB: Adjusting data points that fit a criteria

data analysis

Basically for some points say
x = 1:1:100; y = x;
plot(x,y);
how can i for example add 1 for x values between 10 and 20.
i tried
if x >10 & x <20;
x1 = x+1;
end
plot(x1,y)
but it doesnt seem to make a variable, but i dont get an error either

Best Answer

   x = 1:1:100; y = x;
   x(x>10 & x<20) = x(x>10 & x<20)+1;
   plot(x,y)
If you want a new variable
     x1 = x;
     x1(x1>10 & x1<20) = x1(x1>10 & x1<20)+1;
     plot(x1,y)
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