Two basic MATLAB problems help

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Paul
Paul 2013-9-26
回答： Jan 2013-9-27
Hi, I'm a student studying engineering and I have my first exam tomorrow on MatLab. I'm going through some practice problems and ran into two that I don't understand, I posted them below and was wondering if anyone could help me out! Thanks
6) Assume that the function *diff* does not exist. Write your own expression(s) to accomplish the same thing for a vector.
7) Find expressions that will evaluate the function f of two variables x and y:
f(x,y) = 3*x - y
where x ranges from 1 to 2 and y ranges from 1 to 5.
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Walter Roberson
Walter Roberson 2013-9-27
编辑：Walter Roberson 2013-9-27
#6, diff() can be done without any loop.
#7 can be done without any loop and without any meshgrid (or ndgrid. or repmat)
Jan
Jan 2013-9-27
编辑：Jan 2013-9-27
These problems are not complicated. So I wish you good luck for your first exam tomorrow.

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回答（2 个）

Image Analyst
Image Analyst 2013-9-27
Hint: type out vec(1:end-1) and vec(2:end) and see what that shows.
Jan
Jan 2013-9-27
#7: When x ranges from 1 to 2 only, you can write down the equation for x=1 and x=2 manually. If you define y=1:5, the work is done already.

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