Matlab Matrix plot from a for-loop

Foto Hello everyone! I just need to make a matrix from my code. The x from 1 to 30 is actually my index. I need a proper y filled with zeros allong and only at i index filled with X Value. Hopefully you could understand me.

[KALYAN ACHARJYA]

Can you please clarify more?

[Rotari Elena]

I have to made a matrix from x,y. My y is the Value from pi_approx from i=1 to 30. I need to fill the matrix whith zeros, said the prof.

[KALYAN ACHARJYA]

matrix=zeros(1,30);

Answer 1

[KALYAN ACHARJYA]

pi_aprox=zeros(1,30);
n=6;
g2n=zeros(1,30);
U_neue=zeros(1,30);
g2n(1)=1;
for i=1:30
    U_neue(i)=n*g2n(i);
    pi_aprox(i)=U_neue(i)/2;
    n=n*2;
    g2n(i)=sqrt(2-sqrt(4-g2n(i)^2));
end 

Please change as per requirements

[Rotari Elena]

Thank you do much. Now says:“you cannot plot. Vectors must be the same lenght“

[KALYAN ACHARJYA]

Please share the complete code

[Rotari Elena]

pi_approx=[];

pi_approx=[];
n = 6;
g2n = 1;



for i = 1:30
    i
    
    U_neue = n * g2n;
    pi_approx(i) = U_neue/2;
    
    
   
    n = n * 2;
    
    g2n = sqrt(2-sqrt(4-g2n^2));
    
    
end



x=1:1:30;
y=zeros();  *Hier I have to define a matrix from my pi_approx then plot it

plot(x,y)

[KALYAN ACHARJYA]

x=1:1:30;
y=zeros(1,30);  
plot(x,y);

Any sense?