Array indices must be positive integers or logical values. Error in ecgtest (line 9) chestNoDC=​chest1(0:1​0000)- meanChest;

I'm facing this problem whenever I try to plot my values from "0"

Array indices must be positive integers

or logical values.

Error in ecgtestCAH (line 9)

chestNoDC=chest1(0:10000)- meanChest;

can you suggest me what to do to avoid this?

[Shayan Sepahvand]

Hi,

The first element of a vector is addressed by 1, not 0: (one-based indexing not zero-based)

X = ones(1000,1);
X[1:20]% the first element
X[0:20]% you will get an error.

try this:

chestNoDC=chest1(1:10000)

[Image Analyst]

@Shayan Sepahvand, Can you post your answer below in the Answer Section, not up here in comments where we ask the poster for clarification? Thanks. That way, the poster can "Accept" your answer and you can get reputation points for it.

[Shayan Sepahvand]

Okay. Tnx.

Answer 1

[Shayan Sepahvand]

Hi,

The first element of a vector is addressed by 1, not 0: (one-based indexing not zero-based)

X = ones(1000,1);
X = [1:20]%the first 20 elements
X = [0:20]% you will get an error.

try this:

chestNoDC=chest1(1:10000)

[Ghufran Abdul Qayum]

@Shayan Sepahvand what do i have to do to show my signal values that are on point 'zero' in the graph then?

[Steven Lord]

If you call plot with one numeric input MATLAB will use the indices of the elements as the X data, starting at 1.

plot((1:10).^2, 'o-') % using 1:10 as the X data

If you call plot with two numeric inputs MATLAB will use the first as the X data and the second as the Y data.

plot(-10:-1, (1:10).^2, 'o-')