I have joined a simple CSV file to my project and am attempting to change a string value to a real value. In editing mode, I bring up the field calculator and create a new field from the first field. I try to change the string to real by doing the command "toreal(nameofmyfield)". When I create the new field though, I get NULL for every value, even though I see the normal numbers in the column I am trying to change.
Any idea what's going on?