Percentage of Days out of 21

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Delany MacDonald
Delany MacDonald 2016-3-16
回答： Image Analyst 2016-3-16
This 21 x 1 array represents the amount of minutes that a nap was taken of the specific day within a 3 week period. How do I find the percentage of days that a nap was taken? Is there a way to ignore the minutes or manipulate matlab to just give me the amount of days which would be 5/21?

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回答（2 个）

Ced
Ced 2016-3-16
Since matlab allows using logicals as integers, you can just count the number of (entries > 0) and divide it by the length of the vector, i.e. sum(t>0)/length(t).
Image Analyst
Image Analyst 2016-3-16
Try this, with napMinutes as your array
percentNapDays = 100.0 * nnz(napMinutes) / numel(napMinutes);
nnz() gives you the Number of Non-Zero elements, and numel() is the total number of elements. This is the percentage, like you asked for. If you would rather have the fraction, then get rid of the 100 which converts the fraction to a percentage in the range 0-100.
fractionOfNapDays = nnz(napMinutes) / numel(napMinutes);

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