Sort Function Help and Selecting Highest Values

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Kyle
Kyle 2011-9-23
Hello, I am trying to create a MatLab function that takes in two inputs, x and y, and outputs select. select should be the same size as x. The elements of select should be the same as the corresponding element x if that element is one of the y largest values in x and 0 otherwise.
I know I am supposed to be using the Sort function to help pick the highest values, but I'm pretty unsure how to make this function.
Thank you for any help you can give.

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回答（1 个）

Walter Roberson
Walter Roberson 2011-9-23
xsorted = sort(x(:));
y_largest_x = xsorted(end-y+1:end);
(Yes, that was deliberately written a bit clumsy.)
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Walter Roberson
Walter Roberson 2011-9-23
No.
It is difficult to give any more hints without giving the key answer away, which would ruin the purpose of the assignment.
The entire assignment can be completed with two statements plus the function header. Ah yes... I just remembered the hack that would allow it to be written as a single statement plus the function header.
Daniel Shub
Daniel Shub 2011-9-25
This sounds like another challenge to see how few characters are needed ...

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