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Rita
0

how to plot two graphs ?

Asked by Rita
on 8 Mar 2016
Latest activity Commented on by Star Strider
on 9 Mar 2016
I have two matrices to plot
A=[1 1.2
3 2.3
7 3.2
8 3 ]
and
B=[2 3.2
4 4.5
5 7
6 0 ]
I want to create a plot
plot(A(:,1),A(:,2),'r');
hold on
plot(B(:,1),B(:,2),'b');
but instead of x it should be month. Any suggestion would be appreciated in advance.

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2 Answers

Star Strider
Answer by Star Strider
on 8 Mar 2016
Edited by Star Strider
on 8 Mar 2016
 Accepted Answer

One approach that will use local month names:
A=[1 1.2
3 2.3
7 3.2
8 3 ]
B=[2 3.2
4 4.5
5 7
6 0 ]
dn = datenum([repmat(2016, size(A,1)+size(B,1), 1) [A(:,1); B(:,1)], ones(size(A,1)+size(B,1), 1)]); % Create Date Numbers From Months
plot(dn(1:size(A,1)) ,A(:,2),'r');
hold on
plot(dn(size(A,1)+1:end),B(:,2),'b');
datetick('x', 'mmm')

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Star Strider
on 9 Mar 2016
My pleasure.
I’m not quite certain what you want, so I did two plots:
D = load('Rita test.mat');
A = D.A;
B = D.B;
% ‘The start date is 2001/1/1 and end date is last day of 2006 (2006/12/31) continuously.’
dn = datenum([2001 01 01]) + [0:(size(A,1)+size(B,1))-1]; % Recalculate ‘dn’
DateA = A(:,1); % First Column Are Indices Into ‘dn’
DateB = B(:,1);
figure(1) % Plot ‘A’ & ‘B’ As Separate Series
plot(dn(DateA), A(:,2), '-')
hold on
plot(dn(DateB), B(:,2), '-')
hold off
grid
set(gca, 'XTickLabelRotation',30, 'FontSize',8)
datetick('x', 'mmm yy')
AcatBsorted = sortrows([A; B], 1); % Concatenate & Sort ‘A’ & ‘B’
figure(2) % Plot ‘A’ & ‘B’ Together
plot(dn(AcatBsorted(:,1)), AcatBsorted(:,2))
grid
set(gca, 'XTickLabelRotation',30, 'FontSize',8)
datetick('x', 'mmm yy')
I don’t know what date resolution you want. I cannot get datetick to plot more ticks even when I tell it to. That works without using datetick, but datetick refuses to plot mid-year dates as well. We can do this with a text call if you want to. If the datetick defaults work for you, I’ll not pursue this further.
Rita
on 9 Mar 2016
Thank you so much.It is exactly what I need.I really appreciate your great help.
Star Strider
on 9 Mar 2016
As always, my pleasure!

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Chad Greene
Answer by Chad Greene
on 8 Mar 2016

Is this what you want?
set(gca,'xtick',1:8,'xticklabel',{'jan','feb','mar','apr','may','jun','jul','aug'})

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