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quad error

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Melissa
Melissa 2012-3-19
Good Afternoon All,
I am attempting to use matlab quad on a simple constant and im getting a rather large error (the calculated value is online 25% of the actual value). Say I have f(x)=10 and wish to calculate the definite integral between 0 and 5.
Then the it will be the integral of 10 dx from 0 to 5
This leads to 10x between 0 and 5 = 10(5)-10(0)=50.
When I use matlab quad I get: >> f=10;a=0;b=5; >> x=quad(inline('f'),a,b)
x =
12.5000
Where am I going wrong with this?
Thanks,
Mel
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Sean de Wolski
Sean de Wolski 2012-3-19
I'd like to throw a word in for recommending against using INLINE!
doc function_handle

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采纳的回答

Andrei Bobrov
Andrei Bobrov 2012-3-19
out = quad(@(x)10*ones(size(x)),0,5)
OR
out = trapz([0 5],[10 10])
  1 个评论
Melissa
Melissa 2012-3-19
thanks so much trapz works perfectly!!

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