Unwanted line on graph plot?

Hello, I was trying to plot a simple code like this:

x=1:6;

y=zeros(6);

     for i=1:6

       y(i)=2^i;

     end

figure(1)

hold on

xlabel('Number of Nodes')

ylabel('Maximum force(N)')

plot(x,y,'-o')

grid on

However, I get this unnecessary line plotted on the x-axis (all points on the x-axis with y coordinate zero) but x coordinates are same as that of the x-coordinates above. How can I remove this ?

Answer 1

[Steven Lord]

You don't want to start with y a 6-by-6 matrix with every element equal to 0. You want to start with a 6 element vector, like:

y = zeros(1, 6);

Answer 2

[KSSV]

x=1:6;
y=zeros(1,6);
for i=1:6    
    y(i)=2^i;    
end
figure(1)
hold on
xlabel('Number of Nodes')
ylabel('Maximum force(N)')
plot(x,y,'-o')
grid on

When you initialize y = zeros(6), it will be a matrix.....don't initialize it as a matrix...initialize it as a vector, y = zeros(1,6) .

You need not to use a loop.....

x=1:6;
i=1:6  ;
y=2.^i;    

figure(1)
hold on
xlabel('Number of Nodes')
ylabel('Maximum force(N)')
plot(x,y,'-o')
grid on