edit txt file but save previous data

helo guys

I generated a table , wrote in a txt file, and when I run again my code I will choose other file, it will write a new table... I want add this table in that same txt file which was the information of first table.

I did this at the end of program;

 fid=fopen('dataFULL.txt','a+');

    writetable(T,'dataFULL.txt','Delimiter',',');
fclose(fid);

when I run my code twice in order to choose other file... it is rewriting my txt file and doesn't save the previous data :((((((((((

Guys... any idea how can I do this?

Answer 1

[dpb]

" If filename is the name of an existing text file, then writetable overwrites the file."

You can't with it. Since writetable opens the file using the file name and doesn't accept a file handle, the fopen in your code snippet above is totally ineffective; the two have nothing whatever in common with each other as far as what is written to the file; there are instead two totally independent file handles created/destroyed, the one explicitly is never used for anything.

Again as another question just a minute ago, seems like a reasonable enhancement request would be in order.

[Adriele Rocha]

you are right !!!Thanks

...The way of do that is just with fprintf, but fprintf doesn't accept cells as input. But I figured out a way :)

[dpb]

"_fprintf doesn't accept cells..."_

Yes, you must cast to char() or "use the curlies, Luke" to dereference the cell content to the underlying array values or strings.