cosd() giving similar value for different angles
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I have the following code. Though latitude(i) and longitude(i) have different values in degree, Ut and Un are giving the same value. Please help me to find the problem in the following code. Ut and Un should be little different than each other. Thanks a lot
data = load('LatLong.txt');
distance = data(:, 1);
speed_km = data(:, 2);
latitude = data(:, 3);
longitude = data(:, 4);
for i = 1:length(speed_km)
speed_r(i) = speed_km(i) * cosd(latitude(i)) * cosd(longitude(i));
speed_t(i) = speed_km(i) * cosd(latitude(i)) * sind(longitude(i));
speed_n(i) = speed_km(i) * sind(longitude(i));
end
Ur = speed_r;
Ut = speed_t;
Un = speed_n;
figure;
plot(distance, Ur, 'b');
hold on
plot(distance, Ut, 'r');
hold on
plot(distance, Un, 'g'); % need correction for Ut and Un as I am getting only one line (green)
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Paul
el 15 de Mzo. de 2024
data = load('LatLong.txt');
speed_km = data(:, 1);
latitude = data(:, 2);
longitude = data(:, 3);
The latitude is quite small, assuming it's actually in degrees.
figure
plot(latitude)
However, the cosd of the latitude isn't exactly one, though it's quite close to one as expected.
figure
plot(cosd(latitude))
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