strcat - catenate character strings
txt=strcat(vstr) catenates character strings : txt=vstr(1)+...+vstr(n)
txt=strcat(vstr,strp) returns txt=strs(1)+strp+...+strp+strs(n). The plus symbol does the same: "a"+"b" is the same as strcat(["a","b"])
strcat(string(1:10),',')