Thread Subject:

EXHAUSTIVE SEARCH with Matlab

Hello All,
I have one problem in Matlba. I have to use exhaustive search o find the maximum value of one function under some constraints. Here i have to find which is the maximum value of this function, considering the parameters that this function is dependent from, will take continuous values, so we have 3 parameters (x, y and z) and one function that is dependent on these parameters. How to find maximum value of this function
f(x,y,z)=(1-exp(-x))/(1-exp3)*)=(1-exp(-y))/(1-exp3)*)=(1-exp(-z))/(1-exp3)
The values for x, y and z are continous in this region:
x (0,xmax)
y(0,ymax) and
z(zmin, Infinit)

Or, you can just tell me aproximately what to do, i will really appreciate this help.
Luki

Thanks in advance

"luan HAKAJ" <LUAN.HAKAJ@GMAIL.COM> wrote in message <jshq4n$gh1$1@newscl01ah.mathworks.com>...
> Hello All,
> I have one problem in Matlba. I have to use exhaustive search o find the maximum value of one function under some constraints. Here i have to find which is the maximum value of this function, considering the parameters that this function is dependent from, will take continuous values, so we have 3 parameters (x, y and z) and one function that is dependent on these parameters. How to find maximum value of this function
> f(x,y,z)=(1-exp(-x))/(1-exp3)*)=(1-exp(-y))/(1-exp3)*)=(1-exp(-z))/(1-exp3)

???

Do you mean

f(x,y,z)=(1-exp(-x))/(1-exp3)*(1-exp(-y))/(1-exp3)*(1-exp(-z))/(1-exp3)

which is monotonically increasing in all variables?

Greg

Hello, first thank ypu very much for writing me. Yes, the function should be monotonically increasing in all variables.

Thank you very much,Waiting for your help!


"Greg Heath" <heath@alumni.brown.edu> wrote in message <jskpdf$hv6$1@newscl01ah.mathworks.com>...
> "luan HAKAJ" <LUAN.HAKAJ@GMAIL.COM> wrote in message <jshq4n$gh1$1@newscl01ah.mathworks.com>...
> > Hello All,
> > I have one problem in Matlba. I have to use exhaustive search o find the maximum value of one function under some constraints. Here i have to find which is the maximum value of this function, considering the parameters that this function is dependent from, will take continuous values, so we have 3 parameters (x, y and z) and one function that is dependent on these parameters. How to find maximum value of this function
> > f(x,y,z)=(1-exp(-x))/(1-exp3)*)=(1-exp(-y))/(1-exp3)*)=(1-exp(-z))/(1-exp3)
>
> ???
>
> Do you mean
>
> f(x,y,z)=(1-exp(-x))/(1-exp3)*(1-exp(-y))/(1-exp3)*(1-exp(-z))/(1-exp3)
>
> which is monotonically increasing in all variables?
>
> Greg

"luan HAKAJ" <LUAN.HAKAJ@GMAIL.COM> wrote in message <jsl3rc$19h$1@newscl01ah.mathworks.com>...
> Hello, first thank ypu very much for writing me. Yes, the function should be monotonically increasing in all variables.
>
> Thank you very much,Waiting for your help!

Why?

If f is monotonically increasing in all variables,

fmax =f(xmax,ymax,zmax)

Or ... am I missing something?

Hope this helps.

Greg