Superimposing Data onto Plot

This is what I did in MATLAB:

plot (x,y,'r.');

modelFun = @(p,time) p(1)*exp(-p(2)*time)+p(3)*exp(-p(4)*time); 
startingVals = [1,1,0,1];
>> fitobject=fit(x,y,modelFun, startingVals)

and I get the following error message:

Error using fit>iParseOptionalArgs (line 975)
Algorithm options must be specified in a FITOPTIONS object or as property-value pairs.

Error in fit (line 105)
[useroptions, useroptargs, probparams] = iParseOptionalArgs( varargin{:} );

Could anyone please show me where I am going wrong? I would really appreciate any help in moving from here.

Thanks so much!

Answer 1

[Walter Roberson]

fitobject = fit(x, y, modelFun, 'StartingPoint', startingVals)