Line plotting

for yy = 1:length(overlap_peaks2)
    x=overlap_peaks2(yy);
    y=1:200000:1000000;
    hold on;

      plot(overlap_peaks2(yy),y, '-r')
  end

length(overlap_peaks2) is just equal to 1

my question is why is it when i plot it, it shows up as seperate dots, how do i make it connect into a line? i am just tryign to plot x=589

Answer 1

[Walter Roberson]

for yy = 1:length(overlap_peaks2)
  x=overlap_peaks2(yy);
  y=1:200000:1000000;
  hold on;
  plot(repmat(x,1,length(y)),y, '-r')
end

By the way, you should also consider

for yy = 1:length(overlap_peaks2)
  x=overlap_peaks2(yy);
  hold on;
  plot([x x],[1 1000000], '-r')
end

Answer 2

[Fangjun Jiang]

If "length(overlap_peaks2) is just equal to 1", then in your code, yy will be 1 and the loop runs once. What is the length of overlap_peaks2(yy)? If it's a scalar, you are just going to get 5 dots.

Check your code again.

[Andy]

in this case overlap_peaks2 is just size of 1, but in some other cases it will be longer. How do i connect those dots with a line?

[Fangjun Jiang]

Usually x and y are two vectors with the same size in plot(x,y), such as plot(1:10,sin(1:10)). plot(1,1:10,'-r') or plot(1:10,1,'-r') still generates a plot but only shows 10 points. Even if you can use plot(repmat(1,1,10),1:10,'-r') to make it draw the line, I am not sure what the line means to you.