In the first test suite, Robinson and Reed both have the same age, so I think either the test suite should be improved or Reed's age in the .mat file should be changed.
Tricky question though
rh x = I don't think you need the  in your max matrix.
where I can get the standard answer?
Easy staff. Don't think too much. First find the maximum age, then use the index of the maximum age and by using that you'll find the corresponding name.
a challenging problem
So what this does is it finds the number where age is equal to the max age, and then that corresponding number gives the position of names that has the max name.
Improved the code to deal with multiple people with the same oldest age
This is a good question.
simple indexing problem
Keep in mind you have to obtain the position for the older person. This was taught in the max(var) class. Good luck!
fist find maximum age then use index of maximum age and by using that find corresponding name
Even typing only "Old_name = 2" resuts in size to be 13. What logic and language did you apply for getting size 8?
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