[Scilab-users] filled contour plot

[Claus Futtrup]

Hi Rafale

Thanks for your kind help. I see how a carefully selected nz controls the
plot.

Actually my data set is much larger. If we look at the magnitudes, they go
from 42 to 92 (in the big data from 28 to 94) dB. If I could make a very
beautiful color map of 94-28 = 66 different colors, that would be
excellent. My experiments show that with jetcolormap it makes sense to have
10. So 10 it is.

If the lines then only go from black to yellow, so be it ... but if they
could be black (or better - white - which will show very clearly in the
map), it would be better. I look at the examples in the contourf ... and
the last example shows many gradients from yellow to red + some black
dash-dotted contour lines. My only problem is that this example is not well
documented (there's essentially no explanation at all). Looking at the
parameters is cryptic.
https://help.scilab.org/docs/6.0.0/en_US/contourf.html

P.S. Yes, I add xlabel and ylabel. :-) ... Good idea.

Best regards,
Claus

On Sun, Jan 21, 2018 at 5:01 PM, Rafael Guerra <jrafaelbguerra at hotmail.com>
wrote:

> Hi Claus,
>
>
>
> Pls check if this solution is satisfactory:
>
>
>
> *//START OF CODE*
>
> frequencies = [200 2000 20000]; *// Hz*
>
> angles = [0 30 60 90 120 150 180]; *// degrees - convert to radians!*
>
> mag00 = [69.253448 92.163385 87.414209]; *// on-axis freq-response*
>
> mag30 = [68.461357 90.569082 76.073549];
>
> mag60 = [65.842262 90.745621 74.152067];
>
> mag90 = [59.420658 80.893365 55.975304];
>
> mag120 = [52.505173 80.795915 44.363582];
>
> mag150 = [53.829987 59.793715 42.443964];
>
> mag180 = [55.650341 73.457973 55.608187];
>
>
>
> magnitudes = [mag00' mag30' mag60' mag90' mag120' mag150' mag180'];
>
>
>
> negative_angles = -angles(2:7);
>
> neg_angle_magnitudes = magnitudes(:,2:7);
>
> angles = [angles negative_angles];
>
> magnitudes = [magnitudes neg_angle_magnitudes];
>
> [angles idx] = gsort(angles,'g','i');
>
> magnitudes = magnitudes(:,idx);
>
>
>
> *clf*;
>
> contourplt = *scf*();
>
> contourplt.color_map=*jetcolormap*(6); *// blue = cold, red = hot :-)*
>
> nz = 40:10:90;
>
> *contour2d*(frequencies,angles,magnitudes,nz,logflag="ln");
>
> *contourf*(frequencies,angles,magnitudes,nz);
>
> *legends*(string(nz),1:length(nz),"lr");
>
> *xlabel*("frequency [Hz]");
>
> *ylabel*("angle (deg)");
>
> *//END OF CODE*
>
>
>
> Regards,
>
> Rafael
>
>
>
>
>
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