Info

This question is closed. Reopen it to edit or answer.

Need help understanding matlab vectors?

1 view (last 30 days)
Dustin
Dustin on 21 Jul 2014
Closed: MATLAB Answer Bot on 20 Aug 2021
Can someone HELP me UNDERSTAND how "I" would go about answering some questions like the ones listed below, "WITHOUT" JUST GIVING ME THE ANSWERS? maybe just a basic vector tutorial. FEEL FREE TO MAKE YOUR OWN EXAMPLES IF THAT'S EASIER.
ok so suppose you have 5 variables BP(blood pressure)normal BP is under 70BPM, race('b','w','h'), age, gender-('male' and 'female'), and BPLabs(A,B,C)-lab a,lab b, lab c. 50 patients, each patient had 10 tests done example questions.. in terms of matlab code
1.total# of normal BP's
2. # of men in the cohort
3. # of measurements that lab A made
4. number of 'w' females in the study
5. # of black men who are above the age of 30
6. code to find the BP form lab C
7. BP's from males age 50-65
8. max BP measurements in everyone above the age of 50
  5 Comments
Rick Rosson
Rick Rosson on 23 Aug 2014
Above all else, please STOP USING ALL CAPS TO ADD EMPHASIS. Try using bold or italics instead. Thanks!
Jan
Jan on 23 Aug 2014
@Dustin: UPPERCASE means shouting in internet forums.

Answers (1)

Image Analyst
Image Analyst on 23 Aug 2014
Look up in the help the functions max(), min(), find(), sum(), and ismember(). Then look up logical indexing and how to threshold to select indexes:
logicalSelectedIndexes = yourData > lowValue & yourData < highValue;
selectedData = yourData(logicalSelectedIndexes);
That will be enough to solve everything you listed.

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!