Index in position 2 exceeds array bounds (must not exceed 3).

%% l2/l1=1
N=1; %revolution per minute
theta=28  %dynamic angle of glass beads
w=2*pi*N/60; % angular velocity
D=.5; %drum radius
R=D/2; %drum diameter
g=9.81; %gravity
l1=.05; %radial length in flight
a=0:.5:1;
l2=a.*l1;
%l2=.05; %tangential length in flight
beta=atand(l2./l1);
flight_length_ratio=l2./l1;
rh=R-l1; %distance from the centre to the radial length
meu=tand(theta);%friction of coefficient
alpha=atand(l2./rh); %flight angle
%%
froude= .0011; %foude number
delta=-90:30:270;  %discharge angle
e=0;
f=0;
for u=1:length(a)
    e=e+1;
    for v=1:length(delta) 
        f=f+1;
nominator(e,f)=meu*cosd(alpha(e,f))+froude*rh/R*(cosd(delta(e,f))-meu*sind(delta(e,f)));
    end
end
 nominator_1(1,f)=nominator(e,f);
 
 Error in filling_degree_try (line 28)
nominator(e,f)=meu*cosd(alpha(e,f))+froude*rh/R*(cosd(delta(e,f))-meu*sind(delta(e,f)));

I can't figure it out the error. plz help me to figure it out.

Answer 1

[KALYAN ACHARJYA]

>> length(a)
ans =
     3
>> length(delta) 
ans =
    13
>> size alpha 
ans =
     1     5

Both alpha and delta have 1x5 size, how can you acess the same data with with e and f, where e ranges from 1 to 5, OK no issue, but f ranges from 1 to 25, issue with f value??

See the e and f data

f=0;
e=0;
for u=1:5
    e=e+1
    for v=1:5
        f=f+1
        
    end
end

Result:

e =
     1
f =
     1
f =
     2
f =
     3
f =
     4
f =
     5
e =
     2
f =
     6
f =
     7
f =
     8
f =
     9
f =
    10
e =
     3
f =
    11
f =
    12
f =
    13
f =
    14
f =
    15
e =
     4
f =
    16
f =
    17
f =
    18
f =
    19
f =
    20
e =
     5
f =
    21
f =
    22
f =
    23
f =
    24
f =
    25
>> 

You are trying to acess the data, which does not have like alpha(1,10), delta(3,24) etc.....

In your case the allowable indexing case for alpha or delta(1, maximum 5), hence you cant do that double for iteration loop in this case. The alpha(1,some value) or delta(1,some value), here some value ranges from 1 to 5 only.