How to start my plot from the beginning of the x-axis?

Hi everyone,

I try to create a plot where I want to assign in the x-axis the dates, starting from 01:1974 to 12:2014. If I create the equivalent number of random variables, ie 492, and plot it, I get some emplty space at the beginning of the x-axis. The code is the following

time = datetime(1974,1:492,1);
  y1 = randn(492,6);
  y2 = randn(492,6);
  figure;
  k = 1 : 6;
  a= 0 :5;
  varnames_y1 ={'A ', 'B', 'C' , 'D' , 'E', 'F'}
  for i = 1:6;
  subplot(6,2,a(i)+ k(i))
  filename = plot( time' , y1( : , i ) );
  title ( varnames_y1(i));
  hold on
  end
  varnames_y2 ={'G ', 'H', 'I' , 'J' , 'K', 'L'}
  for i = 1:6;
  subplot(6,2,a(i)+ k(i) + 1)
  filename = plot( time' , y2( : , i ) );
  title ( varnames_y2(i));
  hold on
  end

If you run it you will see that the dates instead of starting from 01:1974, start from 1969. Hence, I get empty space until 01:1974. I would appreciae any help. Thanks in advance.

Answer 1

[KSSV]

clc; clear all ;

time = datetime(1974,1:492,1);
y1 = randn(492,6);
y2 = randn(492,6);
figure;
k = 1 : 6;
a= 0 :5;
varnames_y1 ={'A ', 'B', 'C' , 'D' , 'E', 'F'} ;
for i = 1:6;
    subplot(6,2,a(i)+ k(i))
    % filename = plot( time' , y1( : , i ) );
    x = datenum(time) ;
    filename = plot( x' , y1( : , i ) );
    axis tight
    datetick('x','mm:yyyy','keeplimits')
    title ( varnames_y1(i));
    hold on
end
varnames_y2 ={'G ', 'H', 'I' , 'J' , 'K', 'L'} ;
for i = 1:6;
    subplot(6,2,a(i)+ k(i) + 1)
    x = datenum(time) ;
    filename = plot( x' , y2( : , i ) );
    axis tight
     datetick('x','mm:yyyy','keeplimits')
    title ( varnames_y2(i));
    hold on
end

[gsourop]

It works fine. However, the only problem is that the ticks are very rare. Even if I change the line

    datetick('x','mm:yyyy','keeplimits')

to

    datetick('x','yyyy','keeplimits')

From 1974 to 2014 I can only see 4 ticks (1980, 1990,200,2010) making impossible to read the graph for dates in between these ticks. Could you help me change that?

Answer 2

[Rik]

You can use the xlim function (or on older releases the axis function) to do this. But as xlim only accepts numerical input, you need to convert the time to a number. Hence the following line of code pasted after the plot command should do the trick.

xlim(datenum([min(time) max(time)]))