problem with updation in datetick

[ak501]

I have probelm using dateticks


I plot 399 values of y,z against 399 time values in x

It starts well by begining at first value of x, but as it goes on plotting the the plot gets compressed due to the dates. And I am not able to handle these dates with datetick function.

I wanted to plot only for the values in x and only plot till the values I am plotting. I was trying to aviod the space it was giving at start and end of the plot.

here is the code I use.

function plot_example

x=textread('times.txt');
x=datenum(x);
x=flipud(x);

y=rand(size(x,1),1);
z=rand(size(x,1),1);

a=[];
b=[];
c=[];
figure(2)
hold on

for i = 1:size(x,1)

a=[a;x(i)];
b=[b;y(i)];
c=[c;z(i)];

plotting(datenum(a),b,'r')
plotting(datenum(a),c,'b')


end


function plotting(xx,yy,colors)

plot(xx,yy,colors)
datetick('x',21)
drawnow