abs function not working in matlab while reading table and cell array

I have been trying to plot ecg data and to normalise it i need to find the absolute data .

But I am getting errors.

Kindly help me.

I tried coverting it to mat file and do it too.

still not working .

It is a signal of length 2222.

[Stephen23]

If your data are purely numeric then use READMATRIX.

Otherwise use curly-braces to access the content of a table (not parentheses):

https://www.mathworks.com/help/matlab/matlab_prog/access-data-in-a-table.html

[Krishnapriya]

Thank you

Answer 1

[Askic V]

Please have a look at this:

help table2array

 TABLE2ARRAY Convert table to a homogeneous array.
    A = TABLE2ARRAY(T) converts the table T to an array A whose type depends on
    the data in T.  All variables in T must have sizes and types that are
    compatible for horizontal concatenation.
 
    If T is an M-by-N table with variables that each have one column, then each
    variable becomes one column in A.
 
    Variables in T that have more than one column become multiple columns in A,
    and A has L = SUM(TABLEFUN(@(V)SIZE(V,2),T) columns.  Variables in T may
    have different numbers of columns.  Variables in T may be N-D, but all must
    have the same size in dimensions higher than 2.  A is N-D in this case.
 
    NOTE: TABLE2ARRAY horizontally concatenates the variables in T to create A.
    If the variables in T are cell arrays, TABLE2ARRAY does not concatenate
    their contents -- A is in this case a cell array, equivalent to
    TABLE2CELL(T).  To create an array containing the contents of variables that
    are all cell arrays, use CELL2MAT(TABLE2CELL(T)).
 
    TABLE2ARRAY(T) is equivalent to T{:,:}.
 
    See also ARRAY2TABLE, TABLE2CELL, TABLE2STRUCT, TABLE.

    Documentation for table2array
       doc table2array

    Other uses of table2array

       codistributed/table2array    tall/table2array

[Walter Roberson]

see also readmatrix for new enough matlab

[Krishnapriya]

Thank you,it got sorted out when i called it using d.var2 name instead of directly referring to the column.

Thank You for taking out time to help me.

Regards

Krishnapriya