%%% 写excel 文件测试
clear
clc
title = cell(1,3);%% 表头
title{1} = 'a';
title{2} = 'b';
title{3} = 'c';
xlswrite('str.xls',title);%% 写表头

%% 
colNum1 = 'A';%% 起始列
colNum2 = 'C';%% 结束列
rowNum = 10; %% 行数

for iter =1:20
    C = iter:iter+3;
    Con = num2cell(C);
    rowNum = iter + 1;
    colNum = [colNum1,num2str(rowNum),':',colNum2,num2str(rowNum)];%% 范围
    xlswrite('str.xls',Con,colNum);%% 写入指定行
end

 效果如下图