MATLAB: How to change the scale of plot axes? How to plot circle using separate x and y equations

equationsplot axesscalingstyling plotssubplots

Hi, I need to have this kind of result: (the scaling of the axes, and the graph of the 3rd and 6th subplots)
Here is my code:
for k = 1:6
    ax(k) = subplot(3,3,k);
end
subplot(ax(1))
fplot(@(x) cos(x))
xlabel('x')
ylabel('y')
title('cos(x)')
axis([-5 5 -1 1])
subplot(ax(2))
fplot(@(x) cos(x))
xlabel('x')
ylabel('y')
title('cos(x)')
axis([0 2 -1 1])
subplot(ax(3))
fimplicit(@(x,y) (1/y)-(log(y))+(log(-1+y))+x-1)
xlabel('x')
ylabel('y')
title('1/y-log(y)+log(-1+y)+x-1=0')
axis([-5 5 -5 5])
subplot(ax(4))
fimplicit(@(x,y) x^2+y^2-4)
xlabel('x')
ylabel('y')
title('x^2+y^2-4=0')
axis([-5 5 -5 5])
%Plot for x^3+y^3-5xy+1/5=0
subplot(ax(5))
fimplicit(@(x,y) x^3+y^3-(5*x*y)+(1/5))
xlabel('x')
ylabel('y')
title('x^3+y^3-5xy+1/5=0')
axis([-2 2 -3 3])
t = -5:5;
x = sin(t);
y = cos(t);
subplot(ax(6))
plot(x,y)
xlabel('x')
ylabel('y')
title('x = sin(t),y = cos(t)')
axis([-0.5 0.5 -1 1])
This is the result I get using my code:
Thank you in advance!

Best Answer

Try adding 'axis equal'. You can see additional options here.
You already have the equations for getting X and Y of a circle. The problem is your resolution. Too few points, and your circle might look like an octogon, or a square. The circle will look smoother the smaller the step between each point is. Adjust this by modifying t. For example
t = -5:0.5:5
See here for more. Change the value in the middle until you get the output you like.
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