Matlab - ciclo no corre

clear all;close all;clc

 load meteo_Mar14_07Dec15

fc=datenum([Mar14_Dec15(:,1),Mar14_Dec15(:,2), Mar14_Dec15(:,3),Mar14_Dec15(:,4),Mar14_Dec15(:,5),Mar14_Dec15(:,6)]);

Umaxc=Mar14_Dec15(:,15); Uc=Mar14_Dec15(:,14); Dirc=Mar14_Dec15(:,11);

mc=1;

nc=6;

A=15101;

for j=1:A,

    Uc(j)=mean(Uc(mc:nc));

    Umaxc(j)=mean(Umaxc(mc:nc));

    Dirc(j)=mean(Dirc(mc:nc));

    fc(j)=mean(fc(mc:nc));

    mc=nc; nc=nc+6;

end