Array index error help

Question

0 个投票

Can anyone explain to me why I'm geeting an array indexing error for this script?

Array indices must be positive integers or logical values.

"Error in Finding_rp_test (line 32)

rn = (An(1-(En^2)))./(1+En*cos(thn));"

It's in the last line where I assign rn (Intending on running this for an array of 't' not just a single value).

An = 178942976.896420
En = 0.1781
t    = 1
Mn   = Nn*t;
EE0n = Mn;
DEEn = ((Mn-EE0n)+En*sin(EE0n))./(1-En*cos(EE0n));
    if En==0
        thn = Mn;
    else
        while DEEn>10^-12
            DEEn = (Mn-EE0n+(En*sin(EE0n)))./(1-(En*cos(EE0n)));
            EE0n = EE0n + DEEn;
            thn  = 2*atan((((1+En)./(1-En))^0.5)*tan(EE0n./2));
        end    
    end
    
    rn = (An(1-(En^2)))./(1+En*cos(thn));