[Scilab-users] spline and color plot on the chart

[Federico Miyara]

Daniel,

You may try with lsq_spline, which unlike ordinary spline, doesn't fit 
the data exactly, and it doesn't need the data with any particular order.

But trying to understand your graph, it seems that you should 
parametrize two variables independently, each one with respect to the 
index. Something like this:

x = [x1, x2, ..., xn]
y = [y1, y2, ..., yn]

Then you approximate x vs 1:n and y vs 1:n using spline or lsq_splin. 
Finally you plot xs vs ys (the smoothed versions of x and y)

Regards,

Federico Miyara


On 07/04/2020 22:48, Daniel Stringari wrote:
> Good night friends,
> I wrote an email before, but I believe that I was not clear in my words and
> so I will write more clearly.
>
> In this annex 1, I have the graph I am generating. Basically I am extracting
> values of x (speed) and y (torque) from excel and generating vectors of x []
> and y [] to plot internal lines. I want to smooth these lines, but the
> functions of the scilab are only for growing points. I thought about
> creating cubic splines manually, but I don't know how to do it. Can anybody
> help me ?
>
> In addition, I would like to color my chart with level colors according to
> the colorbar, but I am not able to implement contour2d for this case.
>
> thanks.
>
> <http://mailinglists.scilab.org/file/t498028/annex_1.png>
>
>
>
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