Why do i get rid of this error using cumsum saying 'dimension argument must be positive integer scalar within indexing range?

I am trying to get the cumulative return of four trading strategies using cum sum and it is giving me the error in the screen shot, how do i get rid of it?

Thanks

[Stephen23]

The cumsum help shows that the data is always an array supplied as the first argument to cumsum. What do you expect to happen when you supply cumsum with four separate array input arguments?

Answer 1

[Andrei Bobrov]

May be so?

cumu_ret_is= cumsum([d_pretbm_is,d_pretl_is,d_pret2_is,d_pret3_is])