question about multi variable data fitting

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Y
Y 2012-10-5
Hi,
I am trying to do a simple two variable data fitting, using fittype:
g=fittype('a*exp(-(x-b)^2/c^2-(y-d)^2/f^2)','independent', {'x' 'y'});
However, everytime I run the program, error message says:
Error using internal.matlab.Message In 'curvefit:fittype:SameNameIndAndDepenVars', parameter {1} must be a scalar.
Error in message (line 11) msgObj = internal.matlab.Message(msgID,varargin{:});
Error in fittype>iTestCustomModelParameters (line 811) error(message('curvefit:fittype:SameNameIndAndDepenVars', obj.indep));
Error in fittype (line 355) iTestCustomModelParameters( obj );
Error in LED_roll (line 13) g=fittype('a*exp(-(x-b)^2/c^2-(y-d)^2/f^2)','independent', {'x' 'y'});
Please let me know where I did wrong here.
Thanks

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采纳的回答

Matt Fig
Matt Fig 2012-10-5
编辑：Matt Fig 2012-10-5
Give this a try:
g=fittype('a*exp(-(x-b).^2/c.^2-(y-d).^2./f^2)','inde',{'x' 'y'},'dep','z');
or, use a function handle:
g=fittype(@(a,b,c,d,f,x,y) a*exp(-(x-b).^2/c.^2-(y-d).^2./f^2),'ind', {'x' 'y'},'dep','z');

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