MATLAB: Adding elements of a vector in matlab

addvector

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

Best Answer

fliplr( cumsum( fliplr(a) ) )

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MATLAB: How to creat two box plot in one graph use different data

One way is to use a "grouping variable" as the second argument:

a=[9 3 5 3 0 10 6 8 4 9 7 3 8 6 6 9 1 8 8 6 10];
b=[10 7 5 6 8 6 4 7 8 8 9 7 10 7 6 6 7 2 8 10 8];
ag =   ones(size(a));
bg = 2*ones(size(b));
figure
boxplot([a b]',[ag bg]')
set(gca,'XTickLabel',{'a','b'})

MATLAB: Is it possible to extract the values with a vector of indices for each row without using the for statement from the matrix

see sub2ind()

A = [1, 2, 3; 4, 5, 6; 7, 8, 9; 10, 11, 12]; % reference matrix
b = [2; 1; 1; 3]; % index for each row that I want to extract
idx = sub2ind(size(A), 1:size(A,1), b.');
A(idx)

Result

>> A(idx)
ans =
     2     4     7    12

Best Answer

Related Solutions

MATLAB: How to creat two box plot in one graph use different data

MATLAB: Is it possible to extract the values with a vector of indices for each row without using the for statement from the matrix

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