Matlab How to do z=f(x,y)?

EDAboard.com Forum Index -> Electronic Elementary Questions -> Matlab How to do z=f(x,y)?

Author

Message

davyzhu

Joined: 23 May 2004
Posts: 521
Helped: 3
Location: oriental

18 Mar 2006 14:15 Matlab How to do z=f(x,y)?

Hi all,

I want to do
X=[-5:0.1:5];
Y=[-5:0.1:5];
Z=log(exp(X)+exp(Y));

I want to get Z as a 101*101 (n*n) vector
But the Matlab give Z as a 1*101 (1*n) vector.

How to get Z 101*101 vector without "for loop"?

Best regards,
Davy

mimomod

Joined: 25 Jan 2006
Posts: 109
Helped: 15

18 Mar 2006 19:35 Matlab How to do z=f(x,y)?

Hi davyzhu,

I am not really clear what you need for Z, but i just guess that you want to have every combination of X and X as parameter for Z. Then try:

X=[-5:0.1];
Y=[-5:0.1];
Z=log(exp(kron(ones(length(X),1),X).')+exp(kron(length(Y,1),Y)));

best

Added after 5 minutes:

sorry....there is some mistake....it should have been...

X=[-5:0.1];
Y=[-5:0.1];
Z=log(exp(kron(ones(length(X),1),X).')+exp(kron(ones(length(X),1),X).') );

Added after 15 minutes:

Sorry moderator, still there is small mistake....it should have been...

X=[-5:0.1:5];
Y=[-5:0.1:5];
Z=log(exp(kron(ones(length(X),1),X).')+exp(kron(ones(length(Y),1),Y)) );

i.e. the second exp() is for Y and also there is no transpose operator.

best