specify regions in compass

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Ahmed Siddig
Ahmed Siddig 2018-6-9
回答： Abby Skofield 2024-10-4
how can i specify the readings in compass function to display them in a specific region. for example when i enter
y=(9+170)
and i want it to display in (225,315) region or make the reading in (-,-) region how can i do that thank you in advance
  2 个评论
Walter Roberson
Walter Roberson 2018-6-9
Are you asking how to restrict the graphic output of compass() to a particular range of angles ?

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采纳的回答

Walter Roberson
Walter Roberson 2018-6-9
For the case of compass(Z) with one variable, start with
U = real(Z);
V = imag(Z);
and then continue as for the case with two variables:
nu = numel(U);
[th,r] = cart2pol([zeros(nu,1), U(:), nan(nu,1)], [zeros(nu,1), V(:), nan(nu,1)]);
polarplot(th.', r.', 'b');
ax = gca;
if isprop(ax, 'ThetaLim')
ax.ThetaLim = [225, 315];
else
warning('Cannot restrict angle when you are plotting with hold on');
end
I did not go to the trouble of putting the arrowheads on the output.
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Walter Roberson
Walter Roberson 2018-6-13
Sorry, I do not understand where the points should be moved to, or what angle they should end up pointing.
Ahmed Siddig
Ahmed Siddig 2018-6-14
Sorry about that but you did solve it for me with
ax.ThetaLim = [225, 315]; thank you for that, and sorry i forgot to accept the answer.

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更多回答（1 个）

Abby Skofield
Abby Skofield 2024-10-4
Ran in:
A few recent additions, beyond polaraxes/polarplot which were introduced in R2016a and which @Walter Roberson mentions, may help with use cases like yours. Here is an example showing how to use compassplot (new in R2024b) to visualize vectors eminating from the origin, how to customize the PolarAxes to display only half of the circle, and how to use polarregion (R2024a) to highlight a specific area within the axes.
t = deg2rad(linspace(20, 160,10));
compassplot(t,10:-1:1,LineWidth=2);
thetalim([0 180]) % change theta limits show only 0-180 degrees
polarregion([pi/3 2*pi/3],[4 8],FaceColor="#06AF8F") % highlight a region of interest

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