You need to convert your row and column into cell name that xlswrite understands.
cellname=[xlscol(column) num2str(row)];
You need xlscol from fileexchange: https://www.mathworks.com/matlabcentral/fileexchange/28343-column-converter-for-excel?focused=5156839&tab=function
Note that xlswrite starts to write from that cell, but does not limit writing to that cell. If you feed it with an array or matrix, it will write on neigbour cells too.
An unexpected behaviour (at least to me) is that it writes one letter per cell when writing a char array or string. Therefore, use cellstr(yourtext) when writing those.
