Does somebody know what is wrong with my parantheses in this code?

I have difficulties calling the function i named newton. Since the variable dlam(i) is in a loop it should be dependant on i as well but matlab is displaying a parantheses error.

Thanks in advance

[Scott MacKenzie]

One thing at a time. Concerning your first bug, looks like you need to hone your skills on defining anonymous functions. I suggest you start by studying Anonymous Functions in the MATLAB documentatioin.

[Vincent Jahn]

You are probably right, thanks

Answer 1

[Walter Roberson]

When you are defining an anonymous function, the part directly after the @ must be a list of plain variable names, with no indexing permitted.

It is true that your functions depend upon i, but you are redefining the function inside the for i loop, so you can just let i be a constant relative to the anonymous function -- like

f = @(dlam) (sqrt(3/2) etc)

Are you certain, though, that the calculation for dlam(i) should be in terms of dlam(i+1) even though you are looping forward? It would make more sense to me if dlam(i+1) was in terms of dlam(i) or if you were looping backwards so you calculated dlam(i+1) before you calculated dlam(i)

[Vincent Jahn]

Actually it was

f = @dlam(i+1) (sqrt(3/2) etc) 

before but i tried out a lot of things and forgot to put the +1 back in.

I used the iteration i+1 because of the rest of the code at the bottom. But i will try to use it as an integer without index.

Thank you for the fast answer.