Why should we write x(i,1)=cos(theta(1,i) in this format while using the for loop?

I have a doubt regarding this way of represention.

for i=1:n+1

x(i,1)=R*cos(Theta_n(1,i)

Why cant we represent it as-

x(i)=R*cos(Theta_n(i))

Answer 1

[KSSV]

x = zeros(n+1,1) ; 
for i=1:n+1
x(i)=R*cos(Theta_n(i)

You can very much write like you shown. But keep in mind that the variables should be vectors.

[S Priya]

Thank you for responding sir. If the variables are matrices then should we write in

x(i,1)=R*cos(Theta_n(1,i))

[S Priya]

Also sir,

I want to know whether we can write x=zeros(n+1) instead of zeros(n=1)?

[KSSV]

You can simply try and check the output your self.

When you try:

n = 3 ;
zeros(n+1)

ans = 4×4

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

You will get a matrix.

If you want to get a vector, you should specify:

n = 3 ;
zeros(n+1,1)

ans = 4×1

0 0 0 0

zeros(1,n+1)

ans = 1×4

0 0 0 0

[S Priya]

Thank you sir.