Re: variable and plot

[Patrick Dupre]

Very good,

Then, how can I get a vector in output?
By the way,
sin(1) works as well as 
plot (x, sin (x))
How can I obtain the same behavior ?

Thank.


===========================================================================
 Patrick DUPRÉ                                 | | email: address@hidden
 Laboratoire de Physico-Chimie de l'Atmosphère | |
 Université du Littoral-Côte d'Opale           | |
 Tel.  (33)-(0)3 28 23 76 12                   | | Fax: 03 28 65 82 44
 189A, avenue Maurice Schumann                 | | 59140 Dunkerque, France
===========================================================================


> Sent: Tuesday, April 10, 2018 at 6:35 PM
> From: "Nicholas Jankowski" <address@hidden>
> To: "Patrick Dupre" <address@hidden>
> Cc: "Help GNU Octave" <address@hidden>
> Subject: Re: variable and plot
>
> (please keep the help list in the reply chain)
> 
> On 4/10/18, Patrick Dupre <address@hidden> wrote:
> >> 2)
> >> I have a function
> >> function y = Voigt (x, wD, g)
> >>   y = quad (@(t) w (x, t, wD, g), -10,10);
> >> endfunction
> >>
> >> which seems to work
> >>
> >> Voigt (0, 5, 0.1)
> >> ans =  30.719
> >>
> >> but, I cannot plot it
> >>
> >> x=-10:0.1:10;
> >>  plot (x, Voigt (x, 4,0.1));
> >> This gives me a constant value.
> >
> >
> >
> > You need to understand the outputs of your functions. Run Voigt(x, 4, 0.1)
> > before the plot line and see what your output looks like. quad will only
> > produce a scalar output. So it seems you are calling plot with an array for
> > the x value and a single constant for the y value.
> >
> >
> > I guess that it is the right argument. The question is hwo do I manage the x
> > vector?
> > In other words, what is the difference between
> > x=-10:0.1:10
> > plot (x, sin (x))
> > and my function?
> > plot (x, Int_Sat (x, 2, 1, 0.1, 0.01))
> >
> > function y = Int_Sat (x, Shift, wD, g, s)
> >   y = quad (@(t) Sat (x, t, Shift, wD, g, s), 0, 15) ;
> > endfunction
> >
> >
> 
> 
> Sin(x) will take a vector input and produce a vector otuput. if
> Int_Sat does not produce a vector output, then the plot function will
> not have a vector to work with.  plot is not working with one value of
> x at a time, it is working with two matrices, but Int_Sat produces a
> matrix of size (1,1)
>