Why do I get an error when I am trying to write to a file using IMWRITE in MATLAB 7.8 (R2009a)?

I am trying to write to a file with IMWRITE function. I am trying to create a path to a file in a folder that does not exist:

Z = peaks; surf(Z)
axis tight
set(gca,'nextplot','replacechildren');
surf(sin(2*pi/20)*Z,Z);
F = getframe;
imwrite(F.cdata,'newFolder/testfile.jpeg','jpg')

I get the following error:

ERROR: ??? Error using ==> imwrite at 409
Can't open file "newFolder/testfile.jpeg" for writing.
You may not have write permission.

Answer 1

[MathWorks Support Team]

You need to make sure that the path to file that you specify for IMWRITE exists. You can use MKDIR command to create the directory. Consider the following example:

mkdir('newFolder') 
imwrite(F.cdata,'newFolder/testfile.jpeg','jpg')

For more information on the MKDIR function, please refer to the documentation by executing the following in the MATLAB command prompt:

doc mkdir