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Problem 676. Reindex a vector

Created by James

You are given two vectors of equal length. Vector N has numeric values (no Inf or NaN) while vector IDX has integers. Place the numerical values in a vector N in the output vector y at indices IDX. All other values in the output vector should be zero. For example:

N = [1 3 2 7];

IDX= [2 3 4 6];

y_correct = [0 1 3 2 0 7];

N(1) goes into y at IDX(1). N(2) goes into y at IDX(2), and so on...

If N is a row vector, your output should be a row vector. If N is a column vector, your output should be a column vector.

Good luck!

Problem Group

Solution Statistics

121 correct solutions 138 incorrect solutions
Last solution submitted on Sep 26, 2014