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

Question

gsourop 2017-5-12

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编辑： gsourop 2017-5-12

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.

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Answer 1

KSSV 2017-5-12

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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

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gsourop 2017-5-12

编辑：gsourop 2017-5-12

在 MATLAB Online 中打开

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?

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Answer 2

Rik 2017-5-12

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在 MATLAB Online 中打开

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)]))