ruler n. 统治者;支配者;直尺; 例句 His guitar makes a noise like a wooden ruler being twanged upon a desk 他的吉他发出一声仿佛木尺弹在课桌上的噪...
n=length(A)如果A为非空数组，返回行数和列数两者之间数值较大的那一个值，即相当于执行了max(size(A))；如果A为空数组，则返回0；如果A是一个向量则返回A的...
