Problem with multivariable plots

How do i plot the same function with different values of a constant in a plot?

I have a function, with 2 variable inputs and 2 outputs. I plotted it where i keep the one variable constant, and now i want to plot it keeping the other variable constant, but for multiple values af a constant. Heres the function:

[Gamma, Beta] = Vinkel(n, tid)

n = 1:365;

tid = 0;

Omega = 15*tid;

Phi = 56.3;

Delta = 23.45*sind(360*(284+n)/365;

Theta_z = acosd(cosd(Phi)*cosd(Delta)*cosd(Omega)+sind(Phi)*sind(Delta));

%Sign_Omega gives 1 if Omega is positive and -1 if Omega is negative.

Gamma = Sign_Omega(Omega)*(acosd((cosd(Theta_z)*sind(Phi)-sind(Delta))/(sind(Theta_z)*cosd(Phi))))

Figure

plot(n,Theta_z)

Now i want to plot Gamma and Theta_z for tid = -12:12 for n = 171 and 356.

Answer 1

[Samatha Aleti]

Hi,

According to my understanding you are trying to plot each output “Gamma” and “Theta_z” by changing 2 inputs “tid” and “n”. You can do so by using “hold on”. Here is a sample code:

tid = 2:2:8; % Let 
n = [1 4];  % Let 
Theta_z = tid.*n(1);  % Let: for 1st value of n 
plot(tid,Theta_z); 
hold on 
Theta_z = tid.*n(2); % Let: for 2nd value of n 
plot(tid,Theta_z); 
legend('n = 1','n=4'); 
hold off 

Answer 2

[ashkan mohammadi]

how do i plot this multivariable equation : ax^3-bx^2+3x(3-i^2)-1+i^2

i tried to used polynomial for finding the root of this above equation but i got matlab error..

in fact i'm gonna find x for different value of i, and then plotting x versus i ????