IsText-func
This function is used to determine whether an input is a text.
int isText(string Str$ )
Str$
Return 1 if the input is a text or blank, else 0.
string str1$=abc; isText(str1$)=; //should return 1 string str2$=123; isText(str2$)=; //should return 0 //to check if col(B)[1] is a text isText(col(B)[1]$)=; isText("")=; //should return 1 for blank.
NA, ISNA