Two sets of data with two date ranges and y-axis values

Question

BenSven 2024-3-6

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2091196-two-sets-of-data-with-two-date-ranges-and-y-axis-values

评论： Star Strider 2024-3-6

采纳的回答： Star Strider

Hello all

I have two sets of data in Excel which I have uploaded to Matlab.

I want to plot these data on one grpah as a line/scatter graph.

Data Set 1

This has days on the x axis from day1 to day 250.

The value on the y axis goes up to 20 metres. I want to put this on the left side of the plot which is standard.

Data Set 2

This also has days on the x axis but the data only starts on day 15 and also goes up to 250.

The value on this y-axis for this data goes from 90 - 200 metres. I want to put this on the right side of the plot (Command = yyaxis right?)

I want to plot these two on the same plot but Data Set 2 values should only start on day 10 of Data Set 1

How do I get the data points to line up correctly?

Like this :

plot

code

hold on

code

I'm not sure if I have explained this correctly so please let me know if you need more of an explanation.

Many thanks

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Answer 1

Star Strider 2024-3-6

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2091196-two-sets-of-data-with-two-date-ranges-and-y-axis-values#answer_1421946

编辑：Star Strider 2024-3-6

在 MATLAB Online 中打开

Try this —

x1 = 1:250;

y1 = 20*sin(2*pi*x1/100) + 20 + randn(size(x1))*5;

x2 = 15:250;

y2 = cos(2*pi*x2/150)*60 + 150 + randn(size(x2))*10;

figure

yyaxis left

plot(x1, y1)

ylabel('Y1')

yyaxis right

plot(x2, y2)

xl = xline(15,'--k', '‘(x2,y2)’ Start Time');

xl.LabelVerticalAlignment = 'bottom';

xl.LabelHorizontalAlignment = 'center';

ylabel('Y2')

grid

xlabel('X')

EDIT — (6 Mar 2024 at 19:02)

Added xline call to emphasize when ‘(x2,y2)’ begins.

.

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BenSven 2024-3-6

Thank you. I think I have figured it out.

Very much appreciated.

Star Strider 2024-3-6

As always, my pleasure!

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Answer 2

Aquatris 2024-3-6

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2091196-two-sets-of-data-with-two-date-ranges-and-y-axis-values#answer_1421951

编辑：Aquatris 2024-3-6

在 MATLAB Online 中打开

Something like this maybe:

% create dummy time and data vectors

t1 = datetime(2013,11,1,8,0,0); % define random start of time vector

t2 = datetime(2014,11,1,8,0,0); % define random end of time vector

t_data1 = t1:t2; % time vector for data1

t_data2 = t_data1(120:end); % time vector for data2 that

% starts at a later date than time vector 1

data_1 = rand(length(t_data1),1)*20; % random data 1

data_2 = rand(length(t_data2),1)*200;% random data 2

% desired plot maybe?

yyaxis left

plot(t_data1,data_1,'b.') % plot data 1 with blue dots on left scale

ylabel('data 1')

yyaxis right

plot(t_data2,data_2,'r.') % plot data 2 with red dots on right scale

ylabel('data 2')

legend('data 1','data 2')

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BenSven 2024-3-6

Thank you very much for your help.

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