Need help understanding matlab vectors?

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

[Mikhail]

U should go throw basic tutorials. You will save your and other people time this way.

[dpb]

http://www.mathworks.com/help/matlab/index.html

Press the "Getting Started" button.

Or, just type

doc

at the command line and do the same.

[John D'Errico]

The point is, for us to write a basic tutorial out is silly and a waste of time, when such a thing already exists. It is time to start reading, and when you have some specific question that you cannot puzzle out, then ask it.

But most importantly, TRY SOME THINGS. Get your hands dirty. Use MATLAB. Play around.

[Rick Rosson]

Above all else, please STOP USING ALL CAPS TO ADD EMPHASIS. Try using bold or italics instead. Thanks!

[Jan]

@Dustin: UPPERCASE means shouting in internet forums.

Answer 1

[Image Analyst]

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.