Problem 960. Cell Source Index
Suppose that C is a cell array whose elements consist of row vectors of elements of the same type. For example, C could be a cell vector of strings:
C = {'abc' 'd' 'ef' 'ghij'};
We can put all the elements from all the vectors of C into a single vector:
VC = [C{:}];
Your task: write a function that returns a vector iC, where each element of iC holds the index of the element of C from which the corresponding element of VC came. For example, if C has the value given above, then this would be the correct contents for iC:
iC = [1 1 1 2 3 3 4 4 4 4];
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This is a problem where there's probably a good built-in function, but I don't know it.
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