Add a box with error metrics in plot

Hello everyone.

I have a plot generated by Matlab to which I want to add a box containing some error metrics I produced by my own (please see attached).

These statistics are *not* the ones from Tools -> Data statistics. Is there a way to achieve that?

Thanks in advance!

Answer 1

[Rik]

You can add information to a plot with an annotation, or you can use the rectangle and text functions. The code below will read your data and adapt the example in the documentation.

file='Daily_Stats_Automn2015 Airport Temperature .csv';

%read the whole file, split at the newline, then split at the comma
headers=fileread(file);
headers=split(headers,newline);
headers=split(headers{1},',');

%read the data
data=readmatrix(file,'NumHeaderLines',1);

%format data and text to a cell array
txt=cell(numel(headers),1);
for n=1:numel(txt)
    txt{n}=sprintf('%s = %.4f',headers{n},data(n));
end

figure(1),clf(1)
plot(0:10,0:10)
x = [0.35 0.5];
y = [0.6 0.5];
annotation('textarrow',x,y,'String',txt);

[Daphne PARLIARI]

No, I don't know how to read data to a variable... :-/

Could you please explain that?

[Rik]

This is fairly basic Matlab, so you should consider doing a Matlab tutorial. See my edited answer for an example.

[Daphne PARLIARI]

I finally tried t replicate your suggestion, thank you very much!

Is there a way to choose just some of the metrics contained in the .csv to insert to the graph, instead of the entire file?

I tried several paths but none of them gave the result I need.

[Rik]

If you know the order in which the parameters appear you can select them by modifying the for loop.

[Daphne PARLIARI]

Dear Rik, thank you for you time!

Could I ask one more thing, the answer to it I wasn't able to find in MathWorks?

The plot I want is generated well enough so far using the following lines:

%read the whole file, split at the newline, then split at the comma
headers=fileread(Calc_Stats_file);
headers=split(headers,newline);
headers=split(headers{1},',');
%read the data
data=readmatrix(Calc_Stats_file,'NumHeaderLines',1);
%format data and text to a cell array
txt=cell(numel(headers),1);
for n=1:numel(txt)-10  
    txt{n}=sprintf('%s = %.4f',headers{n},data(n));
end
annotation('textarrow','String',txt);
hold on;
outfile_fig=[output_path,'\',stations{i},'\','\TSHourly_OBSvsWRF.tif'];
plot_ts(All_Data.Hourly_Temp_mean(:),All_Data.Temp(:),thour(1),'hours',[vars{1},' (',varunits{1},')'],'WRF', 'Obs.',[vars{1},' timeseries for ',stations{i},' station'],outfile_fig);
hold off;

The problem is that the graph in the pop-up window disappears after 1 sec., therefore I cannot make the changes I want. Probably it's something with hold on/off I guess, but what do I do wrong?

Thank you once again!