why cant I show the source file name on several graphs?

I was able to show the name of the source file on a graph when it is a single graph. But when I tried the process on a number of files and graphs, it wrote to me that it was unable to display the information

% Reading several data files:

data_path = 'C:\Users\sason\safty\abcd';

matfiles = dir(fullfile(data_path, '*.txt'));

nfiles = length(matfiles);

data = cell(nfiles);

%%

fileNames = cell(nfiles , 1);

for i = 1:nfiles

fileNames{i} = matfiles(i).name;

end

%%

for i = 1 : nfiles

full_data = readtable(matfiles(i).name,'NumHeaderLines',2);

voltage_1 = full_data.Var2(end-990:end);

voltage_2 = full_data.Var3(end-990:end);

time = full_data.Var1(end-990:end);

v1_func_time(:,:,i) = voltage_1;

v2_func_time(:,:,i) = voltage_2;

end

%%

for j = 1 : nfiles

title('voltage_1(time)');

xlabel('Time (second)');

ylabel('Voltage_1(volts)');

plot(time,v1_func_time(:,:,j));

% Get the current axes handle

ax = gca;

% Enable data cursors

datacursormode on;

% Get the data cursor object

dcm_obj = datacursormode(gcf);

% Set the update function

set(dcm_obj, 'UpdateFcn', {@displayFilename, fileNames(i)});

hold on;

end

%%

function txt = displayFilename(~, event_obj, filename)

pos = get(event_obj, 'Position');

txt = {['X: ', num2str(pos(1))], ['Y: ', num2str(pos(2))], ['File: ', filename]};

end

Can you help me solve the problem? And if you see additional comments in general about the code, I'd love for you to tell me.

thenks!

Answer 1

[dim-ask]

Here is a small working example that plots some lines and puts some text to display when you click on.

f = figure;

names = {'plot1' 'plot2' 'plot3'}; % you can replace this with your filenames

hold on

for iLine = 1:3

plot(1:4,(1:4).^iLine,'Tag',names{iLine}); % plot your lines, and add a tag in each

end

datacursormode on;

% Get the data cursor object

dcm_obj = datacursormode(f);

% Set the update function

set(dcm_obj, 'UpdateFcn', @displayFilename); % notice this is applied to the whole plot, not each line

function txt = displayFilename(~, event_obj)

pos = get(event_obj, 'Position');

txt = {['X: ', num2str(pos(1))], ['Y: ', num2str(pos(2))], ['File: ', event_obj.Target.Tag]};

end

note that dcm_obj applies to the whole plot window (notice that you call it with the argument gcf which is basically the whole window; actually gcf is the figure f you created in the beginning), not just each line separately; so when you call it on each loop, it just overwrites the previous one.

Instead, you can add a Tag on each line you plot (eg add 'Tag',fileNames{i} inside the plot function call) and use that to add the text in displayFilename. And then you need to call set(dcm_obj, 'UpdateFcn', @displayFilename); only once in the end of your loop. Similar with hold on, you may only have to call it once in the beginning not on each loop (just to make things more clear).

[sason yaakov bochnick]

hey and thanks for your answer!

I need to add the file source of the graph on a plot with 1000 graph (all the 1000 graph need to be on one plot). Therefor, i cant use your method with list of the plot. i tried to use a for loop that take the i graph and tag it with the name of the file that created it. For some reason the tag take the final file only for all the plots.

(**note: in my code now theres a few graph on the plot only, because its a test)

Thank you!