how to quickly decompressed a matrix

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I have compressed matrix a, first row is index and second row is value, how can i convert it to full matrix b of 2x10 elements below?
a = [1 5 8;
0.2 0.6 -1.1];
b = [1 2 3 4 5 6 7 8 9 10;
0.2 0.2 0.2 0.2 0.6 0.6 0.6 -1.1 -1.1 -1.1];

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Walter Roberson
Walter Roberson 2017-2-15
repelem using diff() of the indices as the counts

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