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Numerical Differentiation HW Help

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Charles Darwin
Charles Darwin 2016 年 2 月 26 日
回答済み: Image Analyst 2016 年 2 月 26 日
Hey Everybody,
I usually do okay with my MATLAB homework and lab assignments but this one is stumping me. I waited to long to start it as I've been loaded with other course work but I am hoping someone can help me out. I'll post the assignment so others can view it here. I started typing out the equations for part A but I don't know how to find delta t (especially in part B). Also how would I write the position summation in part A in MATLAB? In general I just don't even know how to attempt this assignment, maybe I'm overthinking it? If someone could show me an example or point me in the right direction with a visual it would be so helpful. I don't want you to do my work for me, I just need to see a visual of what is happening here.
Thank You So much!

回答 (1 件)

Image Analyst
Image Analyst 2016 年 2 月 26 日
I'd use the hour, minute, and second to convert each time to seconds past midnight. Then, since it promises that the delta t is the same between any consecutive elements, you can just compare the seconds from element 2 back to element 1. For example
secsToday = 3600*hours(1) + 60 * minutes(1) + seconds(1);
Do for (2) and then subtract to get the delta t in seconds.
If hours is not a 24 hour clock, then you'll have to take that into account. For example t1 = 12:59:30 p.m. and t2 = 1:00:30 p.m. Perhaps you can just scan the data until you find times where t2's hours are definitely more than t1's hours. Or else just add 12 to t2's hours.

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