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Topic: Calculating a function
Replies: 6   Last Post: Mar 5, 2014 6:01 PM

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Torsten

Posts: 1,454
Registered: 11/8/10
Re: Calculating a function
Posted: Mar 5, 2014 6:20 AM
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"canon " <canexp4@gmail.com> wrote in message <lf5v47$khd$1@newscl01ah.mathworks.com>...
> TideMan <mulgor@gmail.com> wrote in message <4cf3e6a3-0939-448a-8bc7-61c486eb8de9@googlegroups.com>...
> > On Wednesday, March 5, 2014 1:30:11 PM UTC+13, canon wrote:
> > > Hi There
> > >
> > >
> > >
> > > I have a function f(x,y) and x=[a,b] and y=[c,d]. a, b, c and d are discrete variables. My question is I have to combine variable a,b, c and d and for each pair of (x,y) calculate f. How can I do that?
> > >
> > >
> > >
> > > Thanks

> >
> > It depends whether the function will accept x and y as scalars or vectors or matrices.
> > If it will accept matrices, it's easy:
> > x=linspace(a,b,nx); % nx is the no of points in x
> > y=linspace(c,d,ny); % ny is the no of points in y
> > [X,Y]=meshgrid(x,y);
> > out=f(X,Y);

>
> Thank you very much. To make my point more clear assume x=[2, 4, 5, 9] and y=[1, 4, 2, 8]. Technically we have 4*4=16 pairs of (x,y) and need 16 value for f. Could you please help me out?
>
> thanks


Did you even read Tideman's answer ?
If instead of
> > x=linspace(a,b,nx); % nx is the no of points in x
> > y=linspace(c,d,ny); % ny is the no of points in y

you write
x=[2, 4, 5, 9];
y=[1, 2, 4, 8];
you are done.

Best wishes
Torsten.



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