function oo=readingxls(jk);
// illustrates the use of readxls, the function to read xls files

sheets=readxls('../datasets/marks.xls');


s=sheets(1);
// picks out the first sheet as an array
s.text
s.value
size(s);
snum=s.value(2:42,3:15);
// selects the numeric part

oo=convertnan(snum,0);
// converts blanks (Nan) to 0

plot(oo(:,1),oo(:,13));
//plot(oo(:,1),oo(:,13),'+');

// try both of these plots

endfunction;

