MATLAB Central Newsreader - How to generate data by Matlab?

How to generate data by Matlab?

Hero Lee — Thu, 25 Oct 2007 20:23:06 -0400

Dear Sir or Madam,

I'm just a beginner on Matlab, and would like to generate
data from a function by Matlab.

The Function is:
Y=f(x1,x2)=[1+(x1)^-2+(x2)^-1.5]^2
where x1 is belonged to [1,5],
x2 is belonged to [1,5].

How can I do if I want to generate 200 data from this
function by Matlab. If it's available, could you kindly
describe the codes of Matlab? Really thank you so much.

Cheers

Re: How to generate data by Matlab?

Dan Haeg — Fri, 26 Oct 2007 00:38:40 -0400

"Hero Lee" <hero@mathworks.com> wrote in message
<ffqtva$bpk$1@fred.mathworks.com>...
> Dear Sir or Madam,
>
> I'm just a beginner on Matlab, and would like to generate
> data from a function by Matlab.
>
> The Function is:
> Y=f(x1,x2)=[1+(x1)^-2+(x2)^-1.5]^2
> where x1 is belonged to [1,5],
> x2 is belonged to [1,5].
>
> How can I do if I want to generate 200 data from this
> function by Matlab. If it's available, could you kindly
> describe the codes of Matlab? Really thank you so much.
>
> Cheers
>
does this work?

Y=@(x1,x2) (1+x1.^-2+ x2.^-1.5).^2;
d = linspace(1,5,200);
[x,y] = meshgrid(d);

Y(x,y); %here is your 200 x 200 matrix

Re: How to generate data by Matlab?

Hero Lee — Wed, 16 Jan 2008 01:06:04 -0500

"Dan Haeg" <haegd@msoe.edu> wrote in message
<ffrcug$qpj$1@fred.mathworks.com>...
> "Hero Lee" <hero@mathworks.com> wrote in message
> <ffqtva$bpk$1@fred.mathworks.com>...
> > Dear Sir or Madam,
> >
> > I'm just a beginner on Matlab, and would like to
generate
> > data from a function by Matlab.
> >
> > The Function is:
> > Y=f(x1,x2)=[1+(x1)^-2+(x2)^-1.5]^2
> > where x1 is belonged to [1,5],
> > x2 is belonged to [1,5].
> >
> > How can I do if I want to generate 200 data from this
> > function by Matlab. If it's available, could you kindly
> > describe the codes of Matlab? Really thank you so much.
> >
> > Cheers
> >
> does this work?
>
> Y=@(x1,x2) (1+x1.^-2+ x2.^-1.5).^2;
> d = linspace(1,5,200);
> [x,y] = meshgrid(d);
>
> Y(x,y); %here is your 200 x 200 matrix

Really sorry for the late reply and I do appreciate your
answer. Yes, it can work well. However, it seems the result
can not fit my requirement perfectly.

Originally, the outcome should be a "200x3" matrix
(200 examples, 1 output variable, and 2 input variables)
comprising one column of output variable values and two
columns of input variable values, not a "200x200" meshgrid.

Therefore, how can I generate a 200x3 matrix as follows:

             (Output Value) (Input1 Value) (Input2 Value)
Example 1.
Example 2.
    .
    .
    .
Example 200.

Really Thank you so much.