How to plot square root of a function?

I tried plotting the square root of an function. I expect the plot to be curved, but I get a straight line. What am I doing wrong?

x1 = 0:1:10;

y = sqrt(1-(x1).^2);

plot(x,y)

Answer 1

[VBBV]

x1 = 0:0.01:10; % check with small intervals

y = sqrt(1-(x1).^2);

plot(x1,real(y)); ylim([-1 1.5])

If you use small intervals for input to function, you can get a curved plot, Is this what you want ?

Answer 2

[Steven Lord]

Your first two lines define and use a variable x1 but your third uses a variable named x that is not defined in your code. What is the definition of x?