Re: [Gnuplot-info] Multibranch fitting problem

[Thomas S. <t.s...@fz...>]

the ternary operator knows only two cases:
condition fulfilled
condition not fulfilled

you are trying to add a third case which results in an syntax error

you need to nest two ternary operators

set 'help ternary'


Gopesh Patel wrote:
> 
> Hello All,
> 
> I have a question about multibranch fit. If you type
> 'help fit' in gnuplot and then click multibranch fit
> then the following syntax will appear for it:
> 
> f(x,y) = (y==0) ? a*exp(-x/tau) : b*exp(-x/tau)
> fit f(x,y) 'datafile' using  1:-2:2:3  via a, b, tau
> 
> Now I want to fit more than 2 parameters with
> multibranch fit, for example, in this way:
> 
> f(x,y) = (y==0) ? a*exp(-x/tau) : b*exp(-x/tau):
> c*exp(-x/tau) 
> fit f(x,y) 'datafile' using  1:-2:2:3  via a,b,c,tau
> 
> but it gives error that ';' is expected.
> I have 10 indexes in my datafile. So I want it for 10
> parameters.
> 
> Any suggestions please?
> 
> Regards,
> Gopesh
> 
> 
>      
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