clear all; clc
c=[1:3;4:6;7:9;10:12;13:15]
%c=1:15
fileid=fopen('test.txt','w')
%fwrite(fileid,num2str(c))
formatSpec ='%6.2f %6.2f %6.2f\n';
%formatSpec ='%6.2f\n';
fprintf(fileid,formatSpec,c)
fclose(fileid)

%t=load('test.txt')
fileid=fopen('test.txt','r')
%tt = fread(fileid,[1,3],'int8')
[tt,count]=fscanf(fileid,'%f',15)
% tt
% count
% tt1=char(tt)
% rr=str2num(tt1)
rr=reshape(tt,5,3) 
fclose(fileid)