# MatLab - Joining The Dots.

• Feb 17th 2009, 05:53 AM
Mush
MatLab - Joining The Dots.
Hi folks.

I have plotted a graph in matlab. The graph is the result of Newton's Method. My y axis has $r(x_1), r(x_2)... etc$. There are actually only 5 of these values. My x axis is a counter for the number of times the loop was performed. Again, there are only 5 of these.

So as you can imagine, my plot, which is supposed to denote convergence, has only 5 points. Is there a way to get matlab to join them up so there is something to LOOK at on this graph haha?
• Feb 17th 2009, 06:04 AM
Mush
In fact, how do I get the plot to plot ALL values!

Code:

```i = 1; % Define first index. x = 1; %Define first point for method. f = @(x) (x - sin(x)-1); %Define function. df = @(x) (1-cos(x)); %Define derivative of function. %Loop carries out Newton's Method. while abs(f(x)/df(x)) > 0.000001     x = x - (f(x)/df(x));     i = i+1; end %Display the solution in long format. format long x```
Here's my script without any plotting being done. The program gives the final value of x correctly. But how can I get it to plot the initial values I gave it, aswell as each intermediate value in Newton's Method?
• Feb 17th 2009, 06:10 AM
Mush
Nevermind, I got it folks!

Thanks anyway.