Error using cd Cannot CD to ...(Name is nonexistent or not a directory)

Hi,

I have the following code

oldp = uicontrol(fig,...
 'Style',				'Push',...
 'BackgroundColor',     [1 1 .7],...
 'units',				'normalize',...
 'Position',			[0 .333 1 .333],...
 'String',				'Open an existing Project',...
 'Callback',			[...
  ' [projfile,projpath] = uigetfile(''*.prj'',''Select Project File '');',...
  ' cd(projpath);',...   
  ' load(projfile,''cp'',''-mat'');',...   
  ' close(gcf);',...   
  ' clear projpath projfile newp oldp stringforhelp ui*; '...
 ]...
);  

I am getting this error:

Error using cd

Cannot CD to C:\...(Name is nonexistent or not a directory)

Any idea? thanks

[Stephen23]

Do NOT define the callback as a character vector. The MATLAB documentation

https://www.mathworks.com/help/matlab/creating_plots/callback-definition.html

states "Defining a callback as a character vector is not recommended". Specifying the callback with a function handle is recommended, and will make debugging your code much easier.

Do NOT use cd just to read/write data files. All MATLAB functions that read/write data files accept absolute/relative filenames: you should use fullfile to generate the absolute/relative filename and pass that to load (or whatever function you use for reading/writing data files).

Using clear is rarely required in code, and is almost always overused by beginners.

[Curious Mind]

Hi Stephen, I will admit I am a beginner in Matlab. The code worked with no issues in Matlab v2014a. I am now using 2019b and I am getting the error. Any help with how my code should look like?

Thanks!

Answer 1

[Maadhav Akula]

Hi,

You can write the following lines in your callback function:

[projfile,projpath] = uigetfile('*.prj','Select Project File ');
abs_filepath = fullfile(projpath,projfile);
load(abs_filepath,'cp','-mat');

Hope this helps!