how to multiply simplest way this two vectors ?

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x y
x y 2014-12-3
评论： Stephen23 2014-12-3
I have to multiply this xi and y this way:
xi = [98 99 100 101 102 103]; y = [2 4 6 4 3 1]; x = [ 98*ones(1,2), 99*ones(1,4), 100*ones(1,6), 101*ones(1,4),... 102*ones(1,3), 103*ones(1,1) ]
it is possible to somthing this to make.... x = xi.*( ones(1,y(1:end)) ) % this is not working

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Azzi Abdelmalek
Azzi Abdelmalek 2014-12-3
编辑：Azzi Abdelmalek 2014-12-3
xi = [98 99 100 101 102 103];
y = [2 4 6 4 3 1];
x=cell2mat(arrayfun(@(a,b) a*ones(1,b),xi,y,'un',0))
%or you can do it just by using a for loop

更多回答（2 个）

Guillaume
Guillaume 2014-12-3
编辑：Guillaume 2014-12-3
This is not a multiplication.
One of many ways to do what you want:
xi = [98 99 100 101 102 103];
y = [2 4 6 4 3 1];
x = cell2mat(arrayfun(@(v, r) repmat(v, 1, r), xi, y, 'UniformOutput', false))
Andrei Bobrov
Andrei Bobrov 2014-12-3
a = accumarray(cumsum([1; y(:)]),1);
x = xi(cumsum(a(1:end-1)));

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