integral function not working

Hey all,

I just started using Matlab and now I need to calculate an integral, but even the examples from the 'doc integral' page don't work when put in the command window ...

Error using integral

Too many input arguments.

or

Error using exp

Not enough input arguments.

I tried

q = integral(exp,0,1)

q = integral('exp',0,1)

fun = @(x) x.^2

q = integral(fun,0,1)

and it all gave out one of the above stated errors. I tried out a example life script from the doc site and it worked immediately and also putting the other integrals in the command window worked but after closing the life script it gave out the same errors as before ... Anybody got a clue what's going on there?

Thanks in advance!

Answer 1

[Star Strider]

You need to create a ‘function handle’ to the exp function with an ‘@’ sign:

q = integral(@exp,0,1)

q =
     1.7183

[Adrian Schmidt]

I just tried, this is what happened:

Trial>> q = integral(@exp,0,1)

Error using integral

Too many input arguments.

[Steven Lord]

Which version of the integral function are you trying to use?

which -all integral

That code you posted works with the integral function included in MATLAB. It may not work if you've created your own integral function or downloaded one as part of someone else's code.

[Adrian Schmidt]

Thank you Steve!

I actually had another function in the folder i was using that was called integral. Now i renamed it Matlab uses the built in integral function and everything works fine.

Thanks again!