Import from Excel and exclude fully blank rows

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Francesco Ardia
Francesco Ardia el 12 de Dic. de 2017
Respondida: Michal Dobai el 13 de Dic. de 2017
Hi everyone! I'm trying to modify a code generated by the import tool, thus making the code more flexible with respect to changes in the original Excel file.
The autogenerated code states:
raw(cellfun(@(x) ~isempty(x) && isnumeric(x) && isnan(x),raw)) = {''};
% Find row with blank cells
I = any(cellfun(@(x) isempty(x) || (ischar(x) && all(x==' ')),raw),2);
raw(I,:) = [];
This excludes rows with even a single blank cell. I want to import the whole Excel sheet and then exclude fully blank rows, how can I achieve this?
  3 comentarios
Michal Dobai
Michal Dobai el 13 de Dic. de 2017
Glad I could help. :)
I will post it as an answer, then.

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Michal Dobai
Michal Dobai el 13 de Dic. de 2017
Just change this:
I = any(cellfun(@(x)...
to this:
I = all(cellfun(@(x)...
Why? Let' have a closer look at your code. On this line:
I = all(cellfun(@(x) isempty(x) || (ischar(x) && all(x==' ')),raw),2);
cellfun() returns logical array same size as raw. At position of every empty cell or cell containing only spaces will be 1. Rest of elements will be 0.
Now we want to find fully blank rows. That means, in our logical array we have to find 'all ones' rows. And that's exactly what all() does. Second argument, number 2, is dimension to operate along. In our case, it says we want to get a column vector which tells us for each row if it is empty or not.
B = all(A,dim) Determine if all array elements are nonzero or true. Tests elements along dimension dim. The dim input is a positive integer scalar.
Function any() works same way, but instead of determine if all array elements are nonzero or true it says if any of them are. (if there is at least one such element).
And finally, when we have column vector I - position of lines that are empty, we can delete them.
raw(I,:) = [];

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