Re: How to scale the plot

[Ben Abbott]

On Apr 27, 2013, at 12:37 AM, z-999 wrote:

> Hi all,
> 
> I am new to octave
> 
> I want to plot the following :
> 
> <http://octave.1599824.n4.nabble.com/file/n4652351/loglog.png> 
> 
> 
> please help
> 
> I tried using plot but the line not smooth 
> 
> 
> plot (data (:,1), data (:,2)*0.000001); 

I don't have your actual data values, but what you need to do is plot a line 
and a set of points.  The first plot is below.

T = [0.1 0.8 6.4 52.2];
N = [1, 2, 4, 8] * 1e3;
p = polyfit (log10(N), log10(T), 1);

n = linspace (1e3, 8e3, 701);
t = 10.^(polyval (p, log10(n)));

h = plot (n, t, N, T, "o");
set (h, "markerfacecolor", [0 0.5 0])
xlabel ("problem size N")
ylabel ("running time T(N)")
set (gca (), "xtick", [0:1e3:8e3],
             "xticklabel", {"", "1K", "2K", "", "4K", "", "", "", "8K"},
             "ytick", 0:5:50,
             "yticklabel", {"", "", "10", "", "20", "", "30", "", "40", "", 
"50"})

Ben