How to print the current filename in a plot in matlab? - matlab

Question

I have one .m file per plot and want to see in my draft printouts, which file was used to create it.
This should be done with a function which can be placed in my .m file and
commented out, for the final version.
% addWatermarkFilename() %
So far I found mfilename(), but it could not get the name of the calling function. I am looking also for a good way to put the text in the picture without changing the size.
Solution:
I combined the suggestions by Luis Mendo and NKN to:
function [ output_args ] = watermarkfilename( )
% WATERMARKFILENAME prints the filename of the calling script in the
% current plot
s = dbstack;
fnames = s(2).name;
TH = text(0,0,fnames,'Interpreter','none');
TH.Color = [0.7 0.7 0.7];
TH.FontSize = 14;
TH.Rotation = 45;
uistack(TH,'bottom');
end

Answer 1

I suggest instead of commenting out a function from the code, use a proper flag. For instance the code can be something like this:
clc,clear,close all
addWaterMark = true; % if true you will get the filename in the title
fname = mfilename; % get file name mfilename('fullpath') for the full-path
t=-2*pi:0.1:2*pi;
y = sin(t);
plot(t,y); grid on;
xlabel('t');ylabel('y');
if addWaterMark
title(['filename: ' fname '.m']);
else
title('plot no.1');
end
A little bit playing with the text function, you can make a proper watermark. something like this:
clc,clear,close all
addWaterMark = true;
fname = mfilename;
fnames = [fname '.m'];
t=-2*pi:0.1:2*pi;
y = sin(t);
plot(t,y); grid on;
xlabel('t');ylabel('y');
if addWaterMark
title(['filename: ' fnames]);
t = text(-3,-0.4,fnames);
t.Color = [0.7 0.7 0.7];
t.FontSize = 40;
t.Rotation = 45;
else
title('plot no.1');
end
Note: Obviously the code between the if and else can be stored as a function that receives the string (char) from the fnames variable and a handle for the figure.

Answer 2

If you want to get the name of the function or script that called the current function or script, use dbstack as follows:
s = dbstack; % get struct with function call stack information
callerName = s(2).name; % get name of second function in the stack
The first entry in s refers to the current function; the second refers to the one that called it.