How do I save multiple figures to a single PDF file in MATLAB?

I have a figure array (6x1) of 6 figures with handle, 'k' in MATLAB R2020a. I can type 'saveas(k,'test.fig')' and the six figures are saved to a single MATLAB file. I would like to save the six figures to a single PDF or TIF file, both of which support multiple pages. If I use 'saveas(k,'test.pdf')' or 'saveas(k,'test.tif')', I get the errors:

Error using checkArgsForHandleToPrint
Handle input must be scalar, vector, or cell array of vectors.

Error in checkArgsForHandleToPrint

Error in print>LocalCreatePrintJob (line 101)
handles = checkArgsForHandleToPrint(0, varargin{:});

Error in print (line 38)
[pj, inputargs] = LocalCreatePrintJob(varargin{:});

Error in saveas (line 181)
print( h, name, ['-d' dev{i}] )

Is there a way I can save the multiple figures in a figure array to a single PDF or TIF file? Is there a built in MATLAB function with arguments that can do this?

Answer 1

[MathWorks Support Team]

The reason you have an issue with the handle is because the figures are closed. The following script creates a 1x6 figure array 'k' and saves the figures to a pdf using the 'exportgraphics' function. Note that all the figures need to be open before you can save them.

k = repmat(figure, 1, 6);
filename = "figures.pdf";

for i = 1:length(k)
    exportgraphics(k(i), filename, 'append', true);
end

close all