plotting x vs y data ?

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Natasha 2015-3-9

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回答： Natasha 2015-3-10

GLB.Ts dSST.txt

I want to plot a line graph of temperature (y axis) vs time (years) (x axis).

But my issue is that the temperature data, the x axis data is given monthly therefore there are 12 data points/ 12 temperatures for every one year point/ time point.

For this reason would you possibly know of a way for me to plot x,y when dealing with data that for each y point there are 12 x points.

Thanks

I have attached the data also

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Answer 1

Michael Haderlein 2015-3-9

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Sorry, I got a bit confused by the description of the problem. You want to plot this part of the file, right?

Year  Jan  Feb  …  Nov  Dec
1880  -33  -26  …  -16  -21
1881  -12  -15  …  -26  -17
1882  4  5  …  -24  -36
…  …  …  …  …  …

I would read this data to get the matrix representation just like

-33  -26  ...  -16  -21
-12  -15  ...  -26  -17
  4    5  ...  -24  -36

, then transpose it and then put it to one long array which will look like

[-33 -26 ... -16 -21 -12 -15 ... -26 -17 4 5 ... -24 -36]'

So now the data is in the correct order and you can plot it. With set(gca,'xtick',...) and set(gca,'xticklabel',{...}), you can also create a reasonable x scale.

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Natasha 2015-3-9

I'm normally just used to plotting data that has one y point for every one x point.

So should I get matlab to extract and display the monthly temperature data (how would I extract the specific data e.g. display(:2,:13) all of column 2 to all of column 13?

To then put this data into an array would I have to type every single number?

I apologize I am only beginning to use matlab.

Michael Haderlein 2015-3-9

在 MATLAB Online 中打开

What do you want to display? I assumed you want to plot all this data in one line, so first point=Jan1880, second point=Feb 1880, 12th point=Dec 1880, 13th point=Jan 1881 etc. I somehow forgot to show you how to do this, assume A is the matrix from the file, then with

A=A';

you transpose and with

Aall=A(:);

you put everything into one long line just as I have written in my first answer.

If you only want to display the data of one year (say, 1882), you plot

plot(A(:,3))

If you want to plot the data of all Novembers, you plot

plot(A(11,:))

This all applies on the transposed array.

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