MATLAB: For loop, Subscript indices must either be real positive integers or logicals

error messagefor loop

Hi,

I have been trying the following commands, but I could not, and got that error, (I got that error, Subscript indices must either be real positive integers or logicals.),

for i=[90,30,-30]

theta(i)=i*pi/180

end

& also, when type length of (i) it equals =-30, how ?, and I have 3 variables ?

actually, I hope to have 3 variables (one at i =90, and another =30, and so on ]

So please could you tell me how could I do this ?

Thanks,

Best Answer

https://www.mathworks.com/matlabcentral/answers/470959-loop-with-two-variables#answer_382585 shows a general structure you can use for looping with values that are not small consecutive integers.

Related Solutions

MATLAB: FOR loop with subs :: NEED HELP

for i=45:90;
    theta=i*(pi/180);
    subs(T_x_new)
end

This will produce 46 matrices of output, so you may wish to reconsider using 45:90 rather than (say) 45:15:90

MATLAB: How can i plot radiation pattern in cartesian coordinate in matlab

Dear Naveedp, here is the code you can use for plotting:

theta = -90:90;
theta_rad = degtorad(theta);
r = 1;
elevation = 0;
[x,y,z] = sph2cart(theta_rad,elevation,r);
E_theta = 1j * 30 * exp(-1j * 2 * pi) * sin(5 * pi * sin(theta)) ./ (5 * pi * sin(theta));
E_phi = 1j * 30 * exp(-1j * 2 * pi) * cos(theta) .* sin(3 * pi * sin(theta)) ./ (3 * pi * sin(theta));
figure, subplot(2,1,1), plot3(x, y, abs(E_theta)), xlabel('x'), ylabel('y'), zlabel('z'), title('E(theta) amplitude')
        subplot(2,1,2), plot3(x, y, angle(E_theta)), xlabel('x'), ylabel('y'), zlabel('z'), title('E(theta) phase')
figure, subplot(2,1,1), plot3(x, y, abs(E_phi)), xlabel('x'), ylabel('y'), zlabel('z'), title('E(phi) amplitude')
        subplot(2,1,2), plot3(x, y, angle(E_phi)), xlabel('x'), ylabel('y'), zlabel('z'), title('E(phi) phase')

Since, I did't see use of angle phi so I assumed it to be 0 and assumed value of radius to be 1. I hope it will help you

Best Answer

Related Solutions

MATLAB: FOR loop with subs :: NEED HELP

MATLAB: How can i plot radiation pattern in cartesian coordinate in matlab

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