Find the time when a parabolic function starts to decrease.

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Roger L
Roger L 2016-10-2
评论： Roger L 2016-10-3
Hello,
My task is to write a script that will find the time when a parabolic function (height, a function of time) reaches its max.
clear all
t=0;
for time=0:0.5:30;
if height(time)>=height(time-0.5)
t=t+0.5;
end
end
disp(t)
height(time-0.5) wouldn't execute so here is my second code
clear all
t=0;
for time=0:0.5:30;
e=0.5:0.5:29;
time2=[0 e];
while height(time)>height(time2)
t=t+0.5;
end
end
disp(t)
this code does not work either. How can i utilize max( ) function in here? And what is the best way to do this kind of loop?
Thanks!

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采纳的回答

Walter Roberson
Walter Roberson 2016-10-2
What is height here? If it is a vector then you cannot use height(time) you can only use height(SomePositiveIntegerIndex) . But once you have found the appropriate positive integer index, you can use it to figure out what the corresponding time is.
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Roger L
Roger L 2016-10-3
thanks for that command, I haven't used it before. It gave me an index on the time vector corresponding to the seconds that I needed.

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