Top Average

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Stephanie
Stephanie 2011-11-22
Create a Matlab function according to the following:
Function name: topaverage
Input:
1. list of real numbers
2. real number
Output:
1. real number that is the average of all items in input #1 that are
equal to or greater than input #2
Example:
r=topaverage([3 6 10 12], 10)
r =
11
How do I get the program to relate the input #2 to one of the elements in the list and only start the average calculation from there? I know I have to sort from lowest to largest... I'm just stuck.
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Walter Roberson
Walter Roberson 2011-11-22
I code-indented the first part, as it was obviously a quote from an assignment.
Jan
Jan 2011-11-22
Thanks, Walter. I hope you get extra-credits for the night-shift.

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Stephanie
Stephanie 2011-11-22
I actually figured it out last night.
Thank you

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Andrei Bobrov
Andrei Bobrov 2011-11-22
[deleted]
Please read about: function_handle (@), Relational Operators, mean
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Jan
Jan 2011-11-22
@Andrei: Yes. And if Stephanie asks in another Matlab forum "what does '@(x,y)mean(x(x>=y))' exactly mean" I'd be naive enough to answer this.
Andrei Bobrov
Andrei Bobrov 2011-11-22
Stephanie would be shipped to the MATLAB help.
e.g. http://www.mathworks.com/help/techdoc/ :)

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Image Analyst
Image Analyst 2011-11-22
Hint:
thresholdedIndexes = yourArray > thresholdValue;
Then look up "logical indexing" and inputdlg() in the help.
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Image Analyst
Image Analyst 2011-11-22
I thought she could use it to ask the user for one or both of the input arguments to be passed to her "topaverage" function. Seems quite reasonable to me, actually even more flexible than if they were hard coded into the m-file. On the other hand I'm not sure where she'd use save() unless it would be to save the output argument "r" to a mat file for some reason.
Jan
Jan 2011-11-22
Dear Image Analyst: No, she does not need SAVE currently. But questions concerning "save(Name)" versus "save('Name')" occur such frequently in the Matlab forums, that reading "help save" four times is simply a good idea.

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