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Student Support Forum: 'Blank entries in a list' topicStudent Support Forum > General > Archives > "Blank entries in a list"

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Randy Silvers
07/23/02 5:56pm

I am using Mathematica to enter grades. I have a matrix that contains blank values, for assignments that have not been entered.

At the bottom, I want to compute the mean and standard deviation of each assignment's score, and enter NA for those assignments that have not been completed/graded.

I can manipulate the matrix to determine the mean and standard deviation of assignments that have been entered, but for those that have not been entered, the Table function returns Mean[{}]. I have tried to use If or Which to skip over those assignments, or to replace Mean[{}] with NA afterwards, but cannot do so.

Please see attachment.



Attachment: gradehelp.nb, URL: ,

Subject (listing for 'Blank entries in a list')
Author Date Posted
Blank entries in a list Randy Silvers 07/23/02 5:56pm
Re: Blank entries in a list Henry Lamb 07/25/02 01:13am
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