how to define a path in saveas command

I am using saveas command in a ''for loop'' to save 20 plots in .png format. How can I add the i counter of for loop in saveas command. Many thanks

pathdatasave = 'E:\matlab';
saveas(gcf,[pathdatasave '%03d' '.png' ]);

Answer 1

[Image Analyst]

You probably messed up by not having the slashes correct. You should use fullfile(), like this:

folder = 'E:\matlab';
if ~isfolder(folder)
    % Folder does not exist.  Ask the user to browse to an existing one.
    uiwait(msgbox('Please select the output folder'))
    folder = uigetdir(pwd);
    if folder == 0
        % User clicked cancel.
        return;
    end
end
for k = 1 : whatever
    % Some code to change the current figure...
    % Now save the current figure.
    baseFileName = sprintf('%03d.png',  k);
    fullFileName = fullfile(folder, baseFileName);
    saveas(gcf, fullFileName);
end

[H-M]

Many thanks,GREAT

Answer 2

[Tommy]

Possibly like this?

pathdatasave = 'E:\matlab';
saveas(gcf,sprintf('%s%03d.png', pathdatasave, i));

[H-M]

It saves nothing