multiplying or dividing vectors

2011 9 8
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I am missing something and I can't figure out what to do. I am trying to divide these 2 vectors. So I want the first number in vector one divided by the first in vector 2. The second in vector 1 divided by the second in vector 2. I get this error Error: Unbalanced or unexpected parenthesis or bracket. Where am I messing up with the syntax? I know its the "speedf." but I don't know how else to write it. Thank You.
speed=[10 20 30 40 50 60 70];
speedf=[speed.*5290/86400];
rd=[11 22 33 44 55 66 77];
rxt=[rd./speedf.]

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Oleg Komarov
Oleg Komarov 2011-9-8

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speed = 10:10:70;
speedf = speed * (5290/86400);
rd = 11:11:77;
rxt = rd./speedf;
The error was just the point after rd./speedf.
I suggest:
  • do not abuse the parentheses
  • try to understand when to use .* or *

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Sean Smith
Sean Smith 2011-9-8
thank you for your help, just wondering what if the speed and rd weren't perfectly spaced out, if they were random numbers such as [2 7 23 45 65 66 70]. then how would you do it?
Oleg Komarov
Oleg Komarov 2011-9-8
randi([1 70],[1 7])
Sean Smith
Sean Smith 2011-9-8
I tried the code you said to use but its just returning 17.966 7 times. which is just 11/.6122685. the first cell divided by the first cell. its not going through all of them. any ideas?
Jan
Jan 2011-9-8
speed*5290/86400 is slower than speed*(5290/86400).
Oleg Komarov
Oleg Komarov 2011-9-9
@Sean: of course, what did you expect? Algebra.
Oleg Komarov
Oleg Komarov 2011-9-9
rxt = (11:11:77)./((10:10:70) * (5290/86400)); --> (5290/86400)^-1 * 1.1

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