The end operator must be used within an array index expression

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Julián Adán
Julián Adán 2022-10-10
编辑： Jan 2022-10-11
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
  3 个评论
显示 1更早的评论
Jan
Jan 2022-10-10
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
Jan 2022-10-11
编辑：Jan 2022-10-11
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.

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回答（1 个）

the cyclist
the cyclist 2022-10-10
编辑：the cyclist 2022-10-10
Ran in:
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.

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