In an array return the length of longest sequence of nans for each column.
x =
[ 2 3 1 2 5 6;
nan nan 5 nan 6 -9;
5 nan 8 nan 6 5;
8 nan 7 -5 5.8 5;
nan 0 0 nan 5 7;
nan 5 9 nan 7 nan;
nan nan 10 0 nan 6;
nan nan 0 1 nan 9]
y_correct =
[ 4 3 0 2 2 1]
Solve

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