Adding elements of a vector in matlab

Hi all,

I have a vector

a=[1 2 3 4 5 6 7 8 9 10 ];

and I want to get the vector

b=[1 +2+3+4+5+6+7 +8 +9 +10; 2+3+4+5+6+7 +8 +9 +10; 3+4+5+6+7 +8 +9 +10; 4+5+6+7 +8 +9 +10; 5+6+7 +8 +9 +10; 6+7 +8 +9 +10;  7 +8 +9 +10;  8 +9 +10;  9 +10 10];

Please note that this is a sample vector; I have a vector of 10000 X1 of random numbers and I want to do the same thing.

Is there any efficient code for that?

Maybe using movesum? I have tried but couldn't

I use MatlabR2020a

Best

[Walter Roberson]

No, movesum is not going to help for that. movesum() deals with fixed length windows.

Answer 1

[Walter Roberson]

fliplr( cumsum( fliplr(a) ) )