The end operator must be used within an array index expression

How to fix this error:

The end operator must be used within an array index expression.

Error in .... (line 17)

shot = shot(101:end,1);

[KSSV]

What is shot in the code? You cannot input it in to a function.

[Nisar Ahmed]

[Shot, dathdr] = ReadRSS('Pshot.rss');

[KSSV]

What is Shot? It is an array?

[Nisar Ahmed]

Yes

[KSSV]

That case it should not throw error. We cannot help unless complete code is shown.

[Nisar Ahmed]

[vp,modhdr] = (ReadRSS('Vp.rss'));
vp = squeeze(vp(1,1,:));

% pad vp with more samples in order to make at least 5 seconds of VRMS
vp = [vp; ones(1500,1)*vp(end)];

[nz] = size(vp,1);
dx = modhdr.geometry.D(1);
dz = modhdr.geometry.D(3);

%% Read data and get sizes
[Shot, dathdr] = ReadRSS('Pshot.rss');
shot = shot(101:end,1);
[nt, ntr] = size(Shot);
dt = dathdr.geometry.D(1);
time_i = (0:nt-1)*dt;
time_i = time_i.';

[KSSV]

What is size of Vp.rss? Is it taking matrix inside the function?

Answer 1

[Steven Lord]

The identifiers shot (all lower-case) and Shot (first letter capitalized) are two different things in MATLAB. Did you mean to index into Shot instead of shot?

[Nisar Ahmed]

Thank you for pointing out first letter capital issue. However, the correct code is like this one

Shot = Shot(101:end, :);

[MUNEEB AHMAD]

The end operator must be used within an array index expression.

Error in test2 (line 5)

BER(i)=ber(end,1);

This is the code.

gama_dB=0:0.5:10;

for i=1:length(gama_dB)

g_dB=gama_dB(i);

sim('Bpsk2')

BER(i)=ber(end,1);

end

Why is this error coming here? plese help.

[Steven Lord]

Nothing in your code defines a variable named ber. Do you have a function named ber accessible to MATLAB? If so that last command inside the for statement tries to call that function with end and 1 as the two inputs. But MATLAB doesn't know how to interpret end in that context and so throws an error.