The end operator must be used within an array index expression

need to solve please this error:

The end operator must be used within an array index

expression.

Error in clases y comandos (line 166)

y(1:end,1) - y(2:end);

this is the code:

a=arduino
fs=1500
N=1000
d=zeros(N,1)
t=linspace(0,(N-1)/fs,N)
t=transpose(t)
z=zeros(N,1)
entrada=line(nan,nan,'color','g','linewidth',0.5)
salida=line(nan,nan,'color','r','linewidth',0.5)
ylim([-0.1,5.1])
xlim([0 (N-1)/fs])
grid 
stop=1
uicontrol('Style','pushButton','String','FINALIZAR','Callback','Stop = 0;')
tic 
while stop
    if toc < 1/fs
        tic
        y(1:end-1) = y(2:end-1);
        y=readVoltage(a,'A0')
        set(entrada,'Xdata',t,'Ydata',y)
        z(1:end) = z(2:end)
        z=readVoltage(a,'A1')
        set(salida,'Xdata',t,'Ydata',z)
        drawnow
    end
    %
end

[Benjamin Thompson]

Please define what y is. Your expression assumes y is both two dimensions and one dimension. Or describe clearly what you are trying to do.

[Jan]

Please post the relevant part of the code and a copy of the complete error message. This is not the complete line:

y(1:end,1) - y(2:end);

[Jan]

Please do not let the readers guess, which one is the line 166. The mentioned line "y(1:end,1) - y(2:end);" does not occur in the shown code. the cyclist hits the point, that "y(1:end,1) = y(2:end)" is meant.

I've formatted your code. You can use the tools above the field for editing by your own in the future.

Answer 1

[the cyclist]

In your code, you have not yet created any variable named y, before you call this line:

y(1:end-1) = y(2:end-1)

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

Therefore, you get this error message because you cannot index a variable that does not exist.