比如有ttt.txt,里面是字符fksklfjsklflskjkfoelsdfj,如何读取呢?我这样:>> a=importdata('ttt.txt')a = 'fksklfjsklflskjkfoelsdfj'>> size(a)ans = 1 1>> a(1)ans = 'fksklfjsklflskjkfoelsdfj'即无法引用字符,感觉这是指针,那么该如何引用字符呢?或者将此结果转化为字符串?