Re: Solving Complex Simultaneous Equations

[James Sherman Jr.]

On Thu, Jun 20, 2013 at 11:45 AM, JoshE87 <address@hidden> wrote:

I have typed what you said, substituting in the real equations in for the
dummy ones, and it did not work.  I do actually have knowledge of what the
"." means at the end of the matrix, and I have been using that extensively.

Can you please explain the use of the "@s"?  Thanks very much for the help.



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That @ symbol defines what are the inputs to your function.  So, something like

f1 = @(X) (X.^2)

Is a function that takes one input called X and squares every element of X, whereas 

f2 = @(X,Y) (X+Y)

is a function that takes two inputs, the first one is called X and the second is called Y and adds them.  This is particularly important in your example, because something like:

u = 2;

f3 = @(X) (X*u)

Is equivalent to writing:

f4 = @(X) (X*2)

both are functions with 1 input that multiplies that input by 2.  However this is different than

u = 2;

f5 = @(X,u) (X*u)

Where now the u=2 assignment is "ignored" and f5 is a function of two inputs, X and u.

Hope this helps,

James Sherman