Conversion to string from struct is not possible.

How to convert to double in order to address each data in this case?

[dpb]

"X" is a structure; it contains two fields.

X.data(i) will reference a member of the data array which is a double

X.textdata(i,j) will reference a given cell of the non-numeric data in the cell array.

What is in the cell array is unknown to us; whether it's something that one or more elements of could be converted to a double would take knowing what the content is; it wasn't recognized by the import tool apparently as such, though...

[Wei Kang Cheng]

how to solve this?

[Benjamin Thompson]

X.data is already a matrix of doubles. Maybe you can post a smaller problem and show the output or result you are looking for? Post code or a sample MAT file with the data.

Answer 1

[Mitch Lautigar]

Couple ways to handle this. I'll explain the top 2.

1 - Pull the data out of the struct.

num_data = x.data;

str_data = x.textdata;

You can now change the type if you wish.

2 - Convert to a cell array/table

This will put everything into a single array/table. Though you might have to format it a little bit.

source: https://www.mathworks.com/help/matlab/ref/struct2cell.html

Hope it helps! If it doesn't, reply and i'll answer when I can.