how to display a value in first column the second column number of times?

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johnson saldanha
johnson saldanha 2018-12-10
评论： johnson saldanha 2018-12-10
suppose i have a column vector x=[1 2 3 4]; and y=[2 3 3.5 4]
i want the output as xy=[1 1 2 2 2 3 3 3 3 4 4 4 4];
the number 3.5 can be rounded off to a whole number. here ive taken it as 4.

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Walter Roberson
Walter Roberson 2018-12-10
编辑：Walter Roberson 2018-12-10
repelem(x, round(y))
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Walter Roberson
Walter Roberson 2018-12-10
cell2mat(arrayfun(@(v, n) v(ones(n,1)), x, round(y), 'uniform', 0)) %assumes inputs are column vectors

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