cosine of a matrix returns weird values.

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Wouter
Wouter 2025-1-20
评论： Wouter 2025-1-20
Ran in:
I'm trying to plot a few forces that chance because of an angle. I've defined the changing angle as beta which is a matrix. Than i'm calcultating two different angles which matter for the calculation of the forces. And for these forces i need, for example, the cosine of angle alpha. The angle of alpha changes between 90 and 0 degrees. But if i take the cosine of this matrix it returns weird numbers. Negative numbers, like -0.4481. It should start at 90 and cosine 90 equals 0 but it doesn't. Does anyone know what is going on?
Fad = 240
Fad = 240
beta = 0:1:180; % Angles
gamma = 180 - beta;
alpha = 0.5.*gamma;
w = cos(alpha); % Cosine and tanges of said angles
x = cos(gamma);
y = tan(alpha);
z = tan(gamma);
Fvloer1 = Fad./w; % Calculations of different forces
Fvloer2 = Fvloer1.*x; % Almost all forces are matrices except for Fad which is a constant.
Fl = Fad.*y;
Ft = Fvloer2.*z;
figure % Plots of these forces against an angle
plot(beta,Fvloer1)
xlabel("Hoek [Graden]")
ylabel("Kracht [N ]")
grid on
figure
plot(beta,Fvloer2)
xlabel("Hoek [Graden]")
ylabel("Kracht [N ]")
grid on
●
figure
plot(beta,Fl)
xlabel("Hoek [Graden]")
ylabel("Kracht [N ]")
grid on
figure
plot(beta,Ft)
xlabel("Hoek [Graden]")
ylabel("Kracht [N ]")
grid on

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采纳的回答

Torsten
Torsten 2025-1-20
编辑：Torsten 2025-1-20
"cos" and "tan" can be applied to angles in radians, not in degrees. Use "cosd" and "tand" instead.

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