Cannot make a simple integral on matlab

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0 个投票

First I've tried this:

Fm=1/(2*pi)*(int(220*2^0.5,0,pi)+int(220*2^0.5,pi,2*pi))

Returns this: Undefined function or method 'int' for input arguments of type 'double'.

Then, I've tried this:

Fm=1/(2*pi)*(quadgk(220*2^0.5,0,pi)+quadgk(220*2^0.5,pi,2*pi))

Which returns this: First input argument must be a function handle.

And This:

Fm=1/(2*pi)*(integral(220*2^0.5,0,pi)+integral(220*2^0.5,pi,2*pi))

Resulting on this: Undefined function or method 'integral' for input arguments of type 'double'

What about this:

1/(2*pi)*(integral(220*2^0.5,0,pi)+integral(220*2^0.5,pi,2*pi))

Hmm... NO!

Maybe this:

integral(220*2^0.5,0,pi), or this: int(220*2^0.5,0,pi)

No! Says Matlab r2010a... I don't like you, little user.

I read MathWorks

But seems like it works for 2013 version only

Don't know what to do.

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Walter Roberson 2013-8-12

Are you really integrating a constant value (220*sqrt(2)) over the range pi to 2*pi ? You know that the integral of a constant over a definite integral is just the constant times the width of the interval ?

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Answer 1

Lucas Silva 2013-8-12

编辑：Lucas Silva 2013-8-12

0 个投票

Worked

Thank you

Now I got to learn what types I'll be using here. Feel free to tutor me.

And yes, yes The result is very simple. Kick the constant out of the integral. But I wanted the answer clearly represented on the paper. Step by step.

Thank you Walter and Sean