Info

此问题已关闭。 请重新打开它进行编辑或回答。

Need help understanding matlab vectors?

2 次查看（过去 30 天）
Dustin
Dustin 2014-7-21
关闭： MATLAB Answer Bot 2021-8-20
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 个评论
显示 3更早的评论
Rick Rosson
Rick Rosson 2014-8-23
Above all else, please STOP USING ALL CAPS TO ADD EMPHASIS. Try using bold or italics instead. Thanks!
Jan
Jan 2014-8-23
@Dustin: UPPERCASE means shouting in internet forums.

请先登录，再回答此问题。

回答（1 个）

Image Analyst
Image Analyst 2014-8-23
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.

标签

Community Treasure Hunt

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

Start Hunting!

Translated by