Writestruct() 'Scalar' Error

I am attempting to use writestruct() to save a structure to a .csv file, using version 2020b.

I started by calling writestruct as follows: writestruct(S,fullname), where S is the structure, and fullname is fullname=[path filename], which was obtained via uiputfile.

When I run this, I receive this error: Expected S to be a scalar.

I figured that the structure S could be anything as long as it is a structure, what am I missing?

Thank you!!

[Geoff Hayes]

Rod - try running the following in your command window

which writestruct -all

What does this return? Just a single reference to the writestruct function or something else? Also, have you tried the examples at writestruct examples to see if they work for you? If they do, you may want to post some of the code that shows us what your structure looks like and how you are calling the function.

[Jakob]

Have you tried struct2table() and then export the table with writetable()?

Answer 1

[Walter Roberson]

No, you must use a scalar structure, not a non-scalar structure.

S(1).this = 'that';
writestruct(S, 'junkfile.xml');
%scalar okay
S(2).this = 'the other';
writestruct(S, 'junkfile.xml');

Expected S to be a scalar.

%not okay

[Rod Lopez]

This is exactly how I have it set up, so no wonder it does not work. I have a structure set up as follows in app designer:

app.Recipe(n).___ stores properties defined by the user, where ____ is a set of fields defined for each "n".

I will try struct2table followed by writetable unless you guys can think of anything else I might try.

Thank you!

[Walter Roberson]

struct2table() sounds plausible.

[Rod Lopez]

As a quick update for anyone who runs into these issues:

Since I needed to export a non-scalar structure to excel, and a few fields are matricies of different sizes, I first used mat2str to consolidate those fields down to what will be a single cell in the table. It is not ideal but at least this way there aren't additional columns in the table for each additional row of one of these fields.

Thank you!

-Rod