What's the error in this program

x=0;
dt=1;
while x<=120
y=325*x;
x=x+dt;
plot(x,y)
end
title('Mothly loan vs commulative payment');
xlabel('Monthly loan' );
ylabel('Commulative payment' );

Answer 1

[Star Strider]

It’s generally not a good idea to put a plot in a loop (unless you want to animate the plot).

This seems to work:

x=0;
dt=1;
k1 = 1;
while x<=120
y(k1)=325*x(end);
x(k1)=x(end)+dt;
k1 = k1 + 1;
end
plot(x,y)
title('Mothly loan vs commulative payment');
xlabel('Monthly loan' );
ylabel('Commulative payment' );

Answer 2

[Image Analyst]

You didn't index x or y inside the loop. But better yet, why not just vectorize it, and not even use a while loop?

dt=1;
x = 0 : dt : 120;
y=325*x;
plot(x,y, 'b.-');
grid on;
title('Mothly loan vs commulative payment');
xlabel('Monthly loan' );
ylabel('Commulative payment' );