# How can I start the cumulative from a specific year?

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Pul on 4 Dec 2021
Commented: Pul on 4 Dec 2021
Hello everyone,
I would need that my cumulative sum to start from 2015 instead of 1998; how can I do it?
C1 = cumsum(DATIECMWFgiornalieri{:, 4})
Thank you!

Voss on 4 Dec 2021
idx = find(DATIECMWFgiornalieri{:,1} == 2015,1);
C1 = cumsum(DATIECMWFgiornalieri{idx:end, 4});
Pul on 4 Dec 2021
Thank you.
But how can I plot it with "LARSEN", if the number of data is different?
loaf('LARSEN')
DTv = datetime(DATIECMWFgiornalieri{:,1:3});
smb=table2array(DATIECMWFgiornalieri(:,4))
for i =1:8402
if isnan(smb(i))
smb(i)=0;
end
end
Cum=cumsum(smb)
Cum_smbp=DATIECMWFgiornalieri;
Cum_smbp(:,4)=array2table(Cum);
plot(larsen_daily.TOA5,LARSEN, 'DisplayName','AWS');
hold on
plot(DTv,table2array(Cum_smbp(:,4)),'m', 'DisplayName','ECMWF');
plot(DTv,table2array(Cum_smbp(:,4),Cum_smbp.SMB_larsenmm(1:8042),'m', 'DisplayName','ECMWF'));
legend('Location','best')
plot(DTv, C1);
hold on
plot(larsen_daily.TOA5, A);
Thank you.