求助，matlab中出现??? Undefined function or method 'fra' for input arguments of type 'double'.

fra不是matlab自带的函数要自己编写 function f=fra(len,inc,x) fh=fix(((size(x,1)-len)/inc)+1) f=zeros(fh,len); i=1;n=1; while i<=fh j=1; while j<=len f(i,j)=x(n); j=j+1;n=n+1; end n=n